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WO2003011593A1 - Films glissants polyolefiniques a orientation biaxiale presentant une meilleure planeite et des proprietes adhesives accrues - Google Patents

Films glissants polyolefiniques a orientation biaxiale presentant une meilleure planeite et des proprietes adhesives accrues Download PDF

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Publication number
WO2003011593A1
WO2003011593A1 PCT/US2002/012818 US0212818W WO03011593A1 WO 2003011593 A1 WO2003011593 A1 WO 2003011593A1 US 0212818 W US0212818 W US 0212818W WO 03011593 A1 WO03011593 A1 WO 03011593A1
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WO
WIPO (PCT)
Prior art keywords
biaxially oriented
oriented multilayer
multilayer film
layer
label
Prior art date
Application number
PCT/US2002/012818
Other languages
English (en)
Inventor
William John Waywood
Original Assignee
Applied Extrusion Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/916,053 external-priority patent/US6946193B1/en
Application filed by Applied Extrusion Technologies, Inc. filed Critical Applied Extrusion Technologies, Inc.
Priority to CA002452026A priority Critical patent/CA2452026C/fr
Priority to MXPA04000740A priority patent/MXPA04000740A/es
Publication of WO2003011593A1 publication Critical patent/WO2003011593A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B32B2037/1215—Hot-melt adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/746—Slipping, anti-blocking, low friction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2519/00—Labels, badges

Definitions

  • This invention relates generally to polyolefin films; more particularly to biaxially oriented polyolefin films, preferably polypropylene films, having a desired flatness to minimize processing problems during printing and/or laminating, desired slip properties to render the films machinable in labeling apparatus and desired adhesion properties to adhere to adhesives, particularly hot melt adhesives, employed in labeling applications.
  • Biaxially oriented polypropylene films have been employed in the roll fed label and packaging industries.
  • One of the key product attributes that must be possessed by these films is a sufficiently low coefficient of friction (COF) to allow the film to easily slide on various machine surfaces, thus resulting in efficient processing of the films.
  • COF coefficient of friction
  • a second key attribute is that the surface having desired slip properties must also have sufficient adhesion properties to effectively adhere to adhesives employed in label applications.
  • the particles When using an organosilicone particulate material such as Tospearl, the particles are typically included in a thin, coextruded surface layer of a multi-layer film.
  • the particles tend to reduce the degree of contact between the polypropylene film and machine surface engaging the skin layer, and generally act like ball bearings to reduce the drag of the film on the machine surfaces. While this technology works well in reducing the degree of contact between the film and the machine surfaces, as well as lowering the measured COF, the resulting film surface has a roughness, or uneven contour, that has been shown to have a negative impact in certain labeling applications.
  • fatty acid amides also have been employed as slip agents to reduce COF.
  • amides generally are compounded with the polyolefin polymer and are thus contained within the matrix of the polymer throughout the orientation process of the film. Since the polyolefin polymer and amide are generally chemically incompatible, over time the amide will migrate to the film's surface, thereby providing desired slip properties to the film. However, due to other steric, thermodynamic and practical considerations, the diffusion process often needs to be accelerated through the use of heat. Although heating the film does provide for a faster and more effective migration of the amide to the film surface, thereby lowering the COF, the exposure of the film to elevated temperatures often causes non-uniform shrinkage of the film. This can have an adverse affect on the desired flatness of the sheet, thereby creating problems during printing and or laminating processes. Moreover, excessive migration of the fatty acid amides to the surface of the film may adversely affect the adhesion properties of the film surface. This can present problems in utilizing the film in labeling applications.
  • a biaxially oriented, multilayer, polyolefin film including a core layer and at least one outer skin layer.
  • the skin layer preferably is adhered to the core layer and has desired slip properties and adhesion properties in accordance with this invention.
  • the outer skin layer preferably includes a blend that is predominately polypropylene homopolymer, by weight, with a minor weight percent of an additive that results in the films of this invention having the desired slip and adhesion properties as specified in greater detail hereinafter.
  • the additive includes an antistatic agent.
  • the antistatic agent includes an ethoxylated alkylamine and/or an ethoxylated alkylamide, each by itself, or each possibly either physically blended with an ester or esterified by a chemical reaction with a suitable acid (e.g., stearic acid) or with another ester, e.g., glycerol monostearate, sorbitol-based esters, etc.
  • a suitable acid e.g., stearic acid
  • another ester e.g., glycerol monostearate, sorbitol-based esters, etc.
  • the antistatic agent includes an ethoxylated alkylamine that is esterified with another ester or with a suitable acid, an ethoxylated alkylamine blended with an ester, or an ethoxylated alkylamine, by itself.
  • glycerol monostearate by itself, as the antistatic additive.
  • the benefits achieved with this latter antistatic additive are not as good as the benefits achieved with an antistatic agent in the form of an ethoxylated alkylamine that is esterified with another ester or with a suitable acid, an ethoxylated alkylamine blended with an ester, or an ethoxylated alkylamine, by itself.
  • the core layer is predominantly a polypropylene homopolymer, by weight, including a minor percent by weight of the core layer of a migratory amide.
  • the additive in the skin layer, preferably including an antistatic agent, and the migratory amide in the core layer are present in amounts that provide a film/metal COF of less than 0.45 and preferably less that 0.35, and an adhesion of at least 50% to hot melt adhesives usable in the products of this invention; more preferably an adhesion of at least 70%; even more preferably an adhesion of at least 90% and most preferably an adhesion in excess of 90%.
  • the additive in the skin layer needs to be of a type that provides the desired slip properties without undesirably affecting adhesion properties and needs to be present in an amount to preclude the migratory amide in the core from migrating to the surface of the skin layer in an amount that impairs the adhesion properties at that surface.
  • the migratory amide needs to be of a type and amount that does not preclude the additive in the skin layer from providing its desired slip and adhesion properties.
  • the additive in the skin layer is an antistatic agent that is included in a particulate masterbatch based on homopolymer polypropylene, with the polypropylene being about 87 - 88% of the masterbatch and the antistatic agent being about 12 - 13% of the masterbatch.
  • the preferred masterbatch is POLYBATCH ASPA 2485, manufactured by A. Schulman, Inc., of Akron, Ohio.
  • the weight percent of the POLYBATCH ASPA 2485 masterbatch employed in the skin layer preferably is at least 4% by weight of said skin layer; more preferably in excess of 4% and even more preferably about 8% or even more.
  • the weight percent of the antistatic agent in the skin layer preferably is at least about 0.48%, more preferably in excess of 0.48% and even more preferably in the range of 0.96% to 1.04%, or even more.
  • the antistatic agent may be an ethoxylated amine, such as a synthetic ethoxylated amine, e.g., Atmer 163 sold by Uniqema in New Castle, Delaware.
  • This ethoxylated amine can be employed by itself or in combination with a small amount of an ester, such as glycerol monostearate, e.g., Atmer 129 sold by Uniqema in New Castle, Delaware.
  • an ester such as glycerol monostearate
  • the migratory amide in the core is behenamide and preferably is present in the core in an amount greater than 0.10% by weight of the core layer and more preferably about 0.25% or more. Most preferably the behenamide is present in a range of about 0.25% to about 0.50%. At a level of about 1.00%, adhesive performance is diminished, and in some cases is unacceptable.
  • the migratory amide is a behenamide of the type supplied as Kemamide B by Witco, based in Greenwich Connecticut, and is included in the commercially available polypropylene homopolymer, Aristech FFO38A2.
  • the adhesives employed in the labels are hot melt adhesives having varying levels of aggressiveness.
  • these hot melt adhesives have a desired level of adhesion to the surface of the outer skin layer including the antistatic agent therein even if the film is exposed to adverse environmental conditions, e.g., as a result of being stored and/or transported in a hot environment for long periods of time. Under these adverse conditions the surface of prior art films including behenamide in both the core and in the outer skin layer of a multilayer structure, or in a single monolayer structure, will not retain its desired adhesion properties.
  • the adhesion of the hot melt adhesives in accordance with this invention is at least 50%; more preferably at least 70%; even more preferably at least 90% and most preferably in excess of 90%.
  • the film surface including the antistatic agent therein is free of direct oxidative treatment, such as corona or flame treatment.
  • direct oxidative treatment e.g., to improve its ink-receptivity or adhesive-receptivity properties
  • the opposed surface preferably is oxidatively treated. This backside treatment is substantially less than the direct treatment of the opposed surface, and still results in the formation of an acceptable product.
  • polypropylene it is intended to mean a crystalline propylene homopolymer or a copolymer of propylene with another olefin having from 2 to 5 carbon atoms in an amount insufficient to have a significant affect on the crystallinity of the polypropylene. Typically this is ethylene in an amount up to about 2% by weight.
  • the polypropylene employed in this invention preferably is the homopolymer.
  • the polypropylenes employed in this invention areZiegler-Natta catalyzed and are commercially available isotactic polypropylenes having a melt-flow rate between about 2 and 10 gm/10min at230°C and 2.16 Kg. load and a DSC melting point of about 160 to 166°C.
  • Suitable polypropylene homopolymers are available from numerous sources, such as Sunoco of Philadelphia, Pennsylvania, Basell, which is located in the Netherlands, Exxon Chemical Company of Baytown, Texas, and Fina Oil and Chemical Company of Deerpark, Texas.
  • the specific polypropylene employed in this invention is not considered a limitation on the broadest aspects of this invention.
  • the polypropylene can be metallocene catalyzed, or a blend of Ziegler-Natta catalyzed and metallocene catalyzed polypropylene.
  • the polyolefin film is a multilayer, biaxially oriented polypropylene film having a central core and at least one outer skin layer, and preferably opposed outer skin layers.
  • the central core is the thickest component of the multilayer film and is sufficiently thick to be self-sustaining or supporting, without the inclusion of one or more outer skin layers.
  • the film has a thickness of 48 gauge, with the core layer being 42 gauge and opposed outer skin layers each being 3 gauge. At least one of the outer skin layers includes a desired low COF in accordance with this invention.
  • the multilayer film includes at least two layers; a thick core layer and a thin outer skin layer having the desired low, metal/film COF slip properties in accordance with this invention.
  • this outer skin layer will sometimes be referred to as the "slip layer” or “outer slip layer.”
  • coefficient of friction refers to a metal/film coefficient of friction determined in a manner to be described hereinafter.
  • the multilayer film includes at least three (3) layers.
  • a coextruded three (3) layer film is clear, or transparent, and includes the slip layer and core layer, as described above, and, in addition, an outer, lower skin layer in the form of a printable or bondable layer, which is on the side of the core layer opposed to the slip layer.
  • the lower skin layer In printed labels employing the clear or transparent three layer structure described in the immediately preceding paragraph, the lower skin layer generally is laminated through a suitable adhesive to another single layer or multilayer film, which can be either clear or opaque.
  • a suitable adhesive to another single layer or multilayer film, which can be either clear or opaque.
  • the coextruded clear film of this invention is printed on the lower skin layer, a reverse printing process is employed so that the printed indicia will be readable through the upper surface of the slip layer, and the adhesive employed to laminate the upper layer of the additional film to the reverse printed label surface is compatible with the ink and the surfaces joined by the adhesive.
  • a direct printing process is employed to include printed indicia on the upper surface of the additional film, which is the surface that is laminated to the lower skin layer through a suitable adhesive. Therefore whether the lower skin layer is reverse printed, or the upper surface of the additional film is direct printed, the printing is in the interior of the label stock, and therefore is protected.
  • the additional film laminated to the multilayer film of this invention preferably is a single layer or multilayer opaque film; thereby providing a white background for the printed material.
  • the additional film laminated to the lower skin layer of a transparent film of this invention also needs to be transparent, whether or not the additional film is a single layer or multilayer film.
  • an adhesive is applied to the lower, exposed surface of the additional film for use in attaching the label to a container, such as a bottle or can.
  • the adhesive is included on vertical edges of the label and most preferably is applied adjacent each vertical edge in the form of a narrow adhesive stripe, as is well known in the art.
  • one of the vertical adhesive stripes on the label is adhered directly to the container, and the label is then wrapped about the container with the other vertical adhesive stripe overlapping and adhesively bonded to the edge of the outer slip layer of the label in a region overlying said first vertical adhesive stripe that directly adheres the lower surface of the label to the container.
  • the vertical adhesive stripe secured to the slip layer provides effective adherence to prevent the label from separating in the overlapped, bonded region.
  • the slip layer of the film of this invention in addition to having a desired low coefficient of friction to permit the film to be handled in commercial labeling equipment, must be capable of effectively adhering the overlapping lower surface of the label thereto through the stripe of adhesive employed for that purpose.
  • the slip layer of the multilayer film has a metal/film COF of less than 0.45 and more preferably less than 0.35, as determined by a modified form of ASTM D1894.
  • a piece of film is placed on both the sled and stainless steel platform, and the COF that is determined is a film/film COF.
  • the film of this invention is placed only on the sled, and the COF is determined between the slip layer of this film and the stainless steel platform of the test apparatus, employing all of the other steps specified in ASTM D1894.
  • the adhesives employed in the labels of this invention are hot melt adhesives, which may have various levels of aggressiveness.
  • the slip layers need to permit "adhesion" of the hot melt adhesives at a level of at least 50%; more preferably at least 70%; even more preferably at least 90% and most preferably in excess of 90%.
  • a Krones labeling machine is employed to adhere a label to a metal can with a hot melt type of adhesive.
  • Krones, Inc. the supplier of Krones packaging equipment in the United States, is located at 9600 South 58 th Street, Franklin, Wl.
  • the adhesive is applied as a stripe to the inside, or lower, surface of the label (that which will contact the can) at the recommended application temperatures using the standard operating procedures for the labeler.
  • the amount of glue applied corresponds to a setting of 1.5 on the glue application wheel of the Krones labeling machine.
  • the labeler is run at an operating speed of 120 labels per minute (LPM).
  • the label is an adhesive lamination of an outer film in accordance with this invention to a printed, voided, opaque, inner film.
  • Both are multi-layer, coextruded, oriented polypropylene films.
  • the structure of the inner film can be varied; however, it is important that the hot melt adhesive that is employed be firmly adhered to the lower surface of the inner film in a manner that will not permit the hot melt adhesive to separate from this lower surface during the peel test for "adhesion.”
  • the peel test is for the purpose of determining the adhesion of the adhesive to the slip layer, and therefore the adhesive can not separate from the lower surface of the inner film prior to separating from the slip layer or prior to the film failing in some other manner, as described hereinafter.
  • the labeler is run at the conditions described above and labels are applied to new, clean metal cans. As the can exits the machine, it is removed and the adhesion evaluated in the manner described hereinafter.
  • the adhesion being investigated is the overlap seal of the adhesive to the slip layer of the film of this invention. An attempt is made to peel the overlap seal apart by lifting the outer, overlapping edge of the label by hand along the length, or vertical dimension, of the can. If the adhesion of the hot melt adhesive to the surface of the slip layer is 100%, then the overlap seal will remain intact and the label will tear or destruct at some other interface.
  • the hot melt adhesive will peel cleanly away from the surface of the slip layer. If the pattern of adhesion is intermittent, with portions of the adhesive remaining adhered to the slip layer and other portions peeling apart cleanly, then the percentage of adhesion is the fraction of the total length of portions of the overlapping edges of the label that remain adhered, as evidenced by the length of portions of the overlapping edges that tear or destruct at an interface other than the adhesive-slip layer interface, to the total length of the overlap seal, reported as a percentage.
  • adhesion of at least 50% is deemed acceptable with the hot melt adhesives utilized in this invention. More preferably the level of adhesion is at least 70%; even more preferably at least 90% and most preferably in excess of 90%. If the adhesion level falls below 50%, then the degree of adhesion should be considered a failure.
  • the test for adhesion generally is carried out within one (1 ) minute of removal of the can from the labeler, and the percentage of adhesion reported for the multilayer films of this invention relate to the adhesion determined in this manner. If the time is extended, then the degree of adhesion generally increases. However, due to the chemical nature of certain hot melt adhesives, the mode of failure can be cohesive (through the thickness of the hot melt itself). This can tend to cloud the adhesion results. In these latter cases, it has been determined that the period of time between production and evaluation of the seal must be altered to a point that is significantly greater than 1 minute. The exact time is dependant upon the specific hot melt adhesive being used and is that time that prevents cohesive failure.
  • the outer slip layer is a blend of a polypropylene homopolymer and a minor weight percent of an additive that results in the films of this invention having the desired slip and adhesion properties specified earlier herein.
  • the additive includes an antistatic agent.
  • the antistatic agent includes an ethoxylated alkylamine and/or an ethoxylated alkylamide, each by itself, or each possibly either physically blended with an ester or esterified by a chemical reaction with a suitable acid (e.g., stearic acid) or with another ester, e.g., glycerol monostearate, sorbitol-based esters, etc.
  • the antistatic agent includes an ethoxylated alkylamine that is esterified with another ester or with a suitable acid, an ethoxylated alkylamine blended with an ester, or an ethoxylated alkylamine, by itself.
  • glycerol monostearate by itself, as the antistatic additive.
  • the benefits achieved with this latter antistatic additive are not as good as the benefits achieved with an antistatic agent in the form of an ethoxylated alkylamine that is esterified with another ester or with a suitable acid, an ethoxylated alkylamine blended with an ester, or an ethoxylated alkylamine, by itself.
  • the additive is an antistatic agent including an ethoxylated alkylamine included in a particulate, or pelletized, masterbatch that is predominantly polypropylene homopolymer, by weight, with a minor percentage, by weight, of the ethoxylated alkylamine.
  • the additive is a blend including 87 - 88% by weight polypropylene homopolymer and 12 - 13% by weight of an antistatic agent including an ethoxylated alkylamine that possibly is either physically blended with an ester or esterified by chemically reacting with another ester, e.g., glycerol monostearate, sorbitol-based esters, etc., or with a suitable acid ,e.g., stearic acid.
  • an antistatic agent including an ethoxylated alkylamine that possibly is either physically blended with an ester or esterified by chemically reacting with another ester, e.g., glycerol monostearate, sorbitol-based esters, etc., or with a suitable acid ,e.g., stearic acid.
  • the antistatic agent may be an ethoxylated amine, such as a synthetic ethoxylated amine, e.g., Atmer 163 sold by Uniqema in New Castle, Delaware.
  • This ethoxylated amine can be employed in small quantities by itself or in combination with a small quantity of an ester, such as glycerol monostearate, e.g., Atmer 129 sold by Uniqema in New Castle, Delaware.
  • an ester such as glycerol monostearate, e.g., Atmer 129 sold by Uniqema in New Castle, Delaware.
  • excellent results have been achieved by employing as the additive either 0.50% Atmer 163 or 1.00% Atmer 163, by itself.
  • additives for achieving the desired slip and adhesion properties may be employed; provided that the additives, in conjunction with the other components of the film, provide the desired slip and adhesion properties specified earlier in this application.
  • the present invention will hereinafter be described in connection with the preferred embodiments including an antistatic agent as the desired additive to the slip layer.
  • the core layer needs to include a migratory amide therein.
  • the migratory amid is behenamide, which is supplied as Kemamide B by Witco, based in Greenwich, Connecticut.
  • other migratory amides are believed to be usable in this invention to achieve the desired COF within the scope of this invention.
  • the core layer preferably is a polypropylene homopolymer containing at least 0.1% of the migratory amide, such as behenamide; more preferably a migratory amide in the range of about 0.2 - 0.5%, and more preferably a migratory amide in the range of about 0.2 - 0.3% based on the total weight of the core layer.
  • the behenamide is present in an amount of about 0.25% of the total weight of the core layer. Although higher percentages of behenamide may be usable there does not appear to be any reason for using such higher percentages.
  • Croda EBS which is an ethylene bis- stearamide
  • Erucamide when employed in the core layer at a level of 0.25% did not provide desirable results in terms of processibility in Krones labeling equipment.
  • the testing with Erucamide has been quite limited, and therefore it is possible that this amide may function acceptably for certain applications and/or at higher concentrations.
  • Erucamide is not a preferred slip agent for use in the most preferred embodiment of this invention, its use is within the scope of the broadest aspects of this invention.
  • the antistatic additive is an ethoxylated alkylamine and/or an ethoxylated alkylamide; most preferably an ethoxylated alkylamine.
  • the ethoxylated alkylamine and/or the ethoxylated alkylamide may be employed individually, either alone, or physically blended with an ester or esterified by a chemical reaction with another ester or a suitable acid, as has been discussed in detail earlier in this application.
  • the antistatic additive is included in a particulate, or pelletized masterbatch identified as POLYBATCH ASPA 2485, which is supplied as a pelletized concentrate by A. Schulman, Inc. of Akron, Ohio.
  • POLYBATCH ASPA 2485 comprises an antistatic agent including an ethoxylated alkylamine that either is blended with an ester or is esterified by a chemical reaction with another ester or with a suitable acid.
  • the POLYBATCH ASPA 2485 is a masterbatch including about 87 - 88% polypropylene homopolymer and about 12 - 13% of the antistatic agent.
  • the POLYBATCH ASPA 2485 masterbatch is present in the slip layer in a range of at least 4% by weight of said skin layer; more preferably in excess of 4% and even more preferably about 8% or even more. Therefore, the antistatic agent in the slip layer, which constitutes 12-13% by weight of the masterbatch, is present in the range of at least about 0.48% by weight based upon the total weight of the polymeric slip layer; more preferably in excess of 0.48%; more preferably in the range of about 0.96% to 1.04%, or even more.
  • the slip layer is capable of receiving hot melt adhesives having various levels of aggressiveness with a desired level of adhesion, thereby making the films highly desirable for use in adhesive label applications.
  • hot melt adhesives are available from H. B. Fuller Company of St. Paul, MN. as well as from other sources.
  • the level of adhesion of the film without the outer slip layer of the present invention remained poor, at approximately 0%, while the modified film in accordance with the present invention had high levels of adhesion in the range of 60% - 98%.
  • a coextruded, multilayer, biaxially oriented polyolefin film in accordance with this invention is a 48-gauge thick, biaxially oriented polypropylene film having a 3-gauge outer slip layer with the antistatic agent therein, a 42-gauge thick core layer adhered to the slip layer and a 3-gauge thick skin layer on the surface of the core opposite that of the slip layer and being receptive to printing and/or bonding applications.
  • the slip layer included 92% polypropylene homopolymer (Aristech FFO35C) combined with 8% of the A. Schulman POLYBATCH ASPA 2485 concentrate.
  • the core layer is a polypropylene homopolymer (Aristech FFO38A2) containing 0.25% behenamide (Kemamide B).
  • the print layer opposite the slip layer is a isotactic polypropylene homopolymer containing 0.25% Tospearl T120 and 0.15% Sylobloc 45, and is sold under the brand name Aristech FFO35W.
  • the Tospearl included in the print layer functions both as a slip and anti-block agent, whereas the Sylobloc 45 functions predominately as an anti-block agent.
  • All of the polymers employed in this invention are polypropylene homopolymers containing 0.068% sodium benzoate nucleator and 0.25% Irganox B225 stabilizer. The inclusion of the sodium benzoate nucleator aids in maintaining the crystallinity of the polypropylene, thereby providing improved optical and strength properties in the films of this invention.
  • the POLYBATCH ASPA 2485 including the antistatic agent therein, in a minor amount, is blended with polypropylene homopolymer to form an outer skin layer, and the migration of the antistatic agent out of the skin layer is believed to be precluded, or at least minimized, by the presence of a migratory amide in the core.
  • the composition of the slip layer precludes the migratory amide in the core from migrating to the surface of the slip layer in an amount that adversely affects the ability of the slip layer to receive hot melt adhesives with the desired degree of adhesion to the film.
  • the films do not need to be heated to achieve migration of the slip agent to the film surface.
  • the possible adverse affect on the flatness of the film resulting from heating of the film is avoided.
  • the films of this invention are exposed to hot environments, e.g., during storage or shipment, the adhesion properties of the slip layer for the hot melt adhesives commonly employed in label applications in accordance with this invention will not be adversely affected.

Landscapes

  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

L'invention concerne un film multicouche à orientation biaxiale pouvant être utilisé pour former des étiquettes adhésives destinées à être fixées sur des contenants tels que des bouteilles ou des boîtes. Ce film comprend une couche centrale contenant du polypropylène et un agent glissant migratoire, ainsi qu'une couche glissante extérieure située d'un côté de la couche centrale. Cette couche glissante comprend principalement (en poids) du polypropylène et un faible pourcentage (en poids) d'un additif. L'additif et l'agent glissant migratoire sont présents selon des quantités conférant à la surface de la couche glissante un coefficient de friction inférieur ou égal à 0,45, et à l'adhésif utilisé sur l'étiquette pour former la couche glissante une adhérence au moins égale à 50 %.
PCT/US2002/012818 2001-07-26 2002-04-23 Films glissants polyolefiniques a orientation biaxiale presentant une meilleure planeite et des proprietes adhesives accrues WO2003011593A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002452026A CA2452026C (fr) 2001-07-26 2002-04-23 Films glissants polyolefiniques a orientation biaxiale presentant une meilleure planeite et des proprietes adhesives accrues
MXPA04000740A MXPA04000740A (es) 2001-07-26 2002-04-23 Peliculas de deslizamiento de poliolefina biaxialmente orientadas con propiedades de adhesion y llanura mejoradas.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/916,053 2001-07-26
US09/916,053 US6946193B1 (en) 2001-07-26 2001-07-26 Biaxially oriented polyolefin slip films with improved flatness and adhesion properties
US814801A 2001-11-08 2001-11-08
US10/008,148 2001-11-08

Publications (1)

Publication Number Publication Date
WO2003011593A1 true WO2003011593A1 (fr) 2003-02-13

Family

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Application Number Title Priority Date Filing Date
PCT/US2002/012818 WO2003011593A1 (fr) 2001-07-26 2002-04-23 Films glissants polyolefiniques a orientation biaxiale presentant une meilleure planeite et des proprietes adhesives accrues

Country Status (3)

Country Link
CA (1) CA2452026C (fr)
MX (1) MXPA04000740A (fr)
WO (1) WO2003011593A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7638854B2 (en) 2005-01-18 2009-12-29 Sharp Kabushiki Kaisha Semiconductor device, display module, and manufacturing method of semiconductor device
EP3292053B1 (fr) 2015-05-07 2020-11-18 Fine Organic Industries Limited Composition de film ou de capuchon en polypropylène

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997030841A1 (fr) * 1996-02-23 1997-08-28 Avery Dennison Corporation Films alveoles uniaxialement orientes
WO2000032396A1 (fr) * 1998-12-02 2000-06-08 Toray Plastics (America), Inc. Film glissant en polypropylene destine a l'emballage, etire biaxialement, a coefficient de frottement stable
WO2000046288A1 (fr) * 1999-02-03 2000-08-10 Applied Extrusion Technologies, Inc. Nouveaux agents glissants et films de polypropylene prepares a partir de ces agents
WO2001046274A1 (fr) * 1999-12-21 2001-06-28 Basell Polyolefine Gmbh Composition de polymere de propylene semi-cristallin, servant a produire des films de polypropylene bioriente

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997030841A1 (fr) * 1996-02-23 1997-08-28 Avery Dennison Corporation Films alveoles uniaxialement orientes
WO2000032396A1 (fr) * 1998-12-02 2000-06-08 Toray Plastics (America), Inc. Film glissant en polypropylene destine a l'emballage, etire biaxialement, a coefficient de frottement stable
WO2000046288A1 (fr) * 1999-02-03 2000-08-10 Applied Extrusion Technologies, Inc. Nouveaux agents glissants et films de polypropylene prepares a partir de ces agents
WO2001046274A1 (fr) * 1999-12-21 2001-06-28 Basell Polyolefine Gmbh Composition de polymere de propylene semi-cristallin, servant a produire des films de polypropylene bioriente

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7638854B2 (en) 2005-01-18 2009-12-29 Sharp Kabushiki Kaisha Semiconductor device, display module, and manufacturing method of semiconductor device
EP3292053B1 (fr) 2015-05-07 2020-11-18 Fine Organic Industries Limited Composition de film ou de capuchon en polypropylène

Also Published As

Publication number Publication date
MXPA04000740A (es) 2004-07-08
CA2452026C (fr) 2007-11-06
CA2452026A1 (fr) 2003-02-13

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