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WO2013030849A1 - Vessie sans couture en latex acrylonitrile butadiène carboxylé à adhésion améliorée pour corps de soupape et son procédé de fabrication - Google Patents

Vessie sans couture en latex acrylonitrile butadiène carboxylé à adhésion améliorée pour corps de soupape et son procédé de fabrication Download PDF

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Publication number
WO2013030849A1
WO2013030849A1 PCT/IN2012/000564 IN2012000564W WO2013030849A1 WO 2013030849 A1 WO2013030849 A1 WO 2013030849A1 IN 2012000564 W IN2012000564 W IN 2012000564W WO 2013030849 A1 WO2013030849 A1 WO 2013030849A1
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WO
WIPO (PCT)
Prior art keywords
latex
bladder
varying
bath
valve body
Prior art date
Application number
PCT/IN2012/000564
Other languages
English (en)
Inventor
Prem Nath Magon
Ashwani Magon
Original Assignee
Prem Nath Magon
Ashwani Magon
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
Application filed by Prem Nath Magon, Ashwani Magon filed Critical Prem Nath Magon
Publication of WO2013030849A1 publication Critical patent/WO2013030849A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B41/00—Hollow inflatable balls
    • A63B41/02—Bladders
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B41/00—Hollow inflatable balls
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B45/00—Apparatus or methods for manufacturing balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/14—Dipping a core
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L13/00—Compositions of rubbers containing carboxyl groups
    • C08L13/02—Latex
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02—Copolymers with acrylonitrile
    • C08L9/04—Latex
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D111/00—Coating compositions based on homopolymers or copolymers of chloroprene
    • C09D111/02—Latex

Definitions

  • the present invention relates to a carboxylated acrylonitrile butadiene latex seamless bladder having improved adhesion for valve body and a process for manufacturing thereof.
  • a bladder is an independently saleable commodity. If it is employed in medical applications for gas transfusion etc., it can be employed without any outer cover thereon. However, if it is employed in sport industry for manufacture of balls, particularly for inflatable balls, then it is covered with an outer cover to protect it from bursting and to form a ball.
  • the outer cover is either hand stitched or machine stitched depending upon the game in which it is being used or the desired characteristics and quality of the end product.
  • the hand stitched outer cover is required, for example, in match and practice balls, and machine stitched cover is required, for example, in match and practice balls including promotional balls wherein the volume of demand is relatively higher.
  • promotional balls means the balls used by manufacturers and/or promoters to promote their products and events, such as during trade fairs, national games, international games, etc.
  • the physical characteristics of bladder for both types of outer covers are different.
  • the present invention particularly relates to a carboxylated acrylonitrile butadiene latex seamless bladder having improved capability to bond with valve body of natural rubber, which is particularly suitable for hand stitched inflatable balls.
  • a carboxylated acrylonitrile butadiene latex seamless bladder having improved capability to bond with valve body of natural rubber, which is particularly suitable for hand stitched inflatable balls.
  • the scope of present invention is not restricted by use of disclosed seamless bladder for hand stitched inflatable balls, because surprisingly the present bladder being suitable for hand stitched inflatable balls has also been found suitable for machine stitched balls including, but not limited to inflatable balls, and also for medical applications including gas transfusion.
  • the film for manufacturing a bladder is not only required to be of suitable weight, but is also required to have controlled inflation capability when inflated as a bladder, to give required shape and size of the ball and to protect the bladder made from such film as well as the outer cover from de-shaping and bursting on inflation.
  • the film for manufacturing the gloves is neither required to be of a suitable weight nor required to have controlled inflation capability as it is neither required to have bounce characteristics nor to be inflated as a bladder to have a particular shape and size, nor is required to be protected from de-shaping and bursting on inflation.
  • the film for manufacturing a bladder is required to have relatively very heavy weight varying from about 500 to about 700 mg/inch , which has been found suitable for providing the shape and bounce characteristics to the hand stitched balls, because the outer cover of the ball and its stitches are strong enough.
  • the film for manufacturing a bladder is required to have even further heavier weight varying from about 700 mg/inch to about 1.5 g/inch , which has been found suitable for providing the shape and bounce characteristics to the machine stitched balls, because the outer cover of such balls and its stitches are not strong enough as compared to hand stitched balls.
  • a film used for manufacturing a hand glove cannot be employed for manufacturing a bladder suitable for a ball.
  • bladder is not made of a film having a required weight and controlled inflation capability
  • the required weight and controlled inflation capability is, then, generally achieved by applying one or more layers of thread breading around the outer layer of the bladder, which has been found to result in increase in the hardness of the bladder, and hence, the bladder does not remain suitable for playing football, and additionally it looses its spherical shape.
  • the bladder made from butyl rubber is used.
  • such bladders are not of required weight.
  • the required weight is achieved by increasing its wall thickness which is determined based on the weight required by employing molding process which is conventionally carried out on an unsupported film made by pasting four panels and not on a bladder per se.
  • the major problem of the molding process is that it cannot be employed if a seamless bladder is required.
  • the molding process therefore, is not suitable.
  • Still further problem of molding process is that even the joints are not of uniform weight, that is, weight at the joints of the bladder is relatively higher adversely resulting in wobbling effect during flight of the ball.
  • the US Patent No. 6,793,597 describes machine stitched ball with floating bladder. It consists of bladder and the outer cover wherein the outer cover is vulcanized with web of thread and adhesive. Further, the outer surface of the bladder is coated with the silicone releasing chemical before winding.
  • bladders made from synthetic butyl rubber exhibit good air retention characteristics, but have poor bounce characteristics. Such bladders have been accepted, but the need for seamless bladder having judicious combination of good air retention characteristics and good bounce characteristics, and still having low manufacturing cost, high productivity and low rejection rate has not been satisfied.
  • the bladders made from natural rubber exhibit good bounce characteristics, but have poor air retention characteristics.
  • Such bladders have also been accepted, but the need for seamless bladder having judicious combination of good air retention characteristics and good bounce characteristics, and still having low manufacturing cost, high productivity and low rejection rate has not been satisfied.
  • the inventors of the present invention have found that if a film of synthetic acrylonitrile butadiene latex for manufacture of a bladder having thickness more than about 0.25 mm is achieved, then drying problem is observed during manufacture of a film which in-turn has been found to cause cracks in the film.
  • bladders made from synthetic acrylonitrile butadiene latex film are of weight varying upto about 300 mg/inch 2 , which as described herein, have not been found suitable for providing the shape and bounce characteristics even of the hand stitched balls, because as described herein, a film to manufacture a bladder suitable for hand stitched inflatable balls should have relatively very heavy weight varying from about 500 to about 700 mg/inch 2 and for machine stitched inflatable balls should have even further heavier weight varying from about 700 mg/inch 2 to about 1.5 g/inch 2 .
  • Still another problem observed with synthetic acrylonitrile butadiene latex is that it results in a film having modulus varying from about 10 to 12 Kg/Cm at 100% stretch [or elongation], which has been found to be a main cause of resulting in a bladder having poor bounce characteristics.
  • bladder made from film of synthetic acrylonitrile butadiene latex gets tear-off from its neck during stripping from a mould resulting in total loss of production.
  • the bladders made from natural latex exhibit good bounce characteristics, but have poor air retention characteristics. Such bladders have been accepted, but the need for a bladder having judicious combination of good air retention characteristics and good bounce characteristics, and still having low manufacturing cost, high productivity and low rejection rate has not been satisfied.
  • bladders made from blends of natural rubber and synthetic rubber are not seamless as these are made by employing molding process, and hence, do not have uniform weight over the entire area, which in-turn results in an inflatable ball having wobbling effects, and therefore, higher rejection rate of the bladders and balls made therefrom.
  • synthetic latex is selected from a group consisting of synthetic acrylonitrile butadiene latex, neoprene [for example polychloroprene latex], isoprene [for example, polyisoprene latex], SBR [styrene butadiene rubber] and natural latex is commonly known as centrifuged latex.
  • synthetic latex is selected from a group consisting of synthetic acrylonitrile butadiene latex, neoprene [for example polychloroprene latex], isoprene [for example, polyisoprene latex], SBR [styrene butadiene rubber] and natural latex is commonly known as centrifuged latex.
  • bladders made from laminates of natural latex and synthetic latex primarily suffer not only from poor curing, i.e. cross linking, which in-turn results in low bounce characteristics, but also from problem of delamination of layers of the laminate, which in-turn results in bursting during performance, and hence, further rejection of the bladder. Accordingly, even laminates of natural latex and synthetic latex have not been able to result in a bladder having good bounce as well as good air retention characteristics, and good strength of the laminate per se to result in strong enough bladder.
  • PCT Patent Application No. PCT/IN2008/000085 discloses a seamless bladder having combination of good air retention characteristics as well as good bounce characteristics for inflatable balls, wherein the bladder is made from carboxylated acrylonitrile butadiene latex and no other latex.
  • neoprene rubber [NR.] adhesive onto coated surface of bladder from step i);
  • step iii) drying the coated surface of bladder from step ii) at about 40-45°C with heat blower;
  • step iv) drying the coated surface of bladder from step iv) at about 40-45°C with heat blower;
  • step of buffing results in problems and risk of tearing of bladder, and hence, in rejection of bladders, which results in additional loss of production, and therefore, makes the overall process further highly uneconomical on industrial scale.
  • the main object of the present invention is to provide a seamless bladder having improved adhesion for valve body or improved capability to bond with valve body and a process for manufacturing thereof, which overcome above-described problems of bladder of PCT'85, and wherein the production cost is substantially reduced by reducing process time, process cost and rejection rate, and by increasing the productivity, and the bladder is still suitable for hand stitched as well as machine stitched inflatable balls, and has judicious combination of good air retention characteristics as well as good bounce characteristics without sacrificing one property for the another property.
  • Another object of the present invention is to provide a seamless bladder, which is capable of protecting its outer cover from bursting whether it is hand stitched or machine stitched, and hence, has wider acceptability and applicability.
  • Still another object of the present invention is to provide a seamless bladder, which not only has required and suitable weight, but also has required controlled inflation, and hence, is capable of giving required shape and size of the ball and protecting the outer cover from de-shaping and bursting on inflation.
  • Yet another object of the present invention is to provide a seamless bladder, wherein it is manufactured by a process which is capable of resulting in a seamless bladder having no joints, and hence, having uniform weight, and therefore, having no wobbling effect during flight of the ball, and still with no substantial increase in cost of material and process per se, and still having increased production rate with substantially reduced capital cost and rejection rate.
  • the bladder made from carboxylated acrylonitrile butadiene latex having a coating of compounded neoprene latex [NL] or of adhesive grade neoprene latex is still suitable for hand stitched as well as machine stitched inflatable balls, and has been found to have judicious combination of good air retention characteristics as well as good bounce characteristics without sacrificing one property for the another property.
  • the bladder made from carboxylated acrylonitrile butadiene latex having a coating of compounded neoprene latex [NL] or of adhesive grade neoprene latex bonds or adheres to the valve body provided only with a coating of natural rubber based adhesive, and without requiring repeated steps of coating of primer and special neoprene rubber adhesive, and repeated steps of heating thereof to dry the coatings, and therefore, overcomes above- described problems of industrial production of inflatable football from bladder of PCT'85.
  • the football made from the bladder of carboxylated acrylonitrile butadiene latex having a coating of compounded neoprene latex [NL] or of adhesive grade neoprene latex provided with valve body has been found to have judicious combination of good air retention characteristics as well as good bounce characteristics without sacrificing one property for the another property.
  • the present invention relates to
  • the bladder comprises
  • a bladder body made from carboxylated acrylonitrile butadiene latex and no other latex
  • said bladder body is provided with at least one coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex.
  • the seamless bladder of present invention has been found to be suitable for hand stitched and machine stitched inflatable balls.
  • the seamless bladder body of present invention is additionally provided with a valve body.
  • the coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex oft the bladder body is of thickness varying from about 0.02 mm to about 0.20 mm, preferably the coating is of thickness varying from about 0.03 mm to about 0.15 mm.
  • the present invention also relates to a seamless bladder having improved adhesion for valve body or improved capability to bond with valve body, wherein the bladder comprises a bladder body made from carboxylated acrylonitrile butadiene latex and no other latex, which is provided with at least one coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex, wherein the bladder has judicious combination of good air retention characteristics and good bounce characteristics without sacrificing one property for the another property, and is used for hand stitched and machine stitched inflatable balls.
  • the bladder comprises a bladder body made from carboxylated acrylonitrile butadiene latex and no other latex, which is provided with at least one coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex, wherein the bladder has judicious combination of good air retention characteristics and good bounce characteristics without
  • the present invention relates to
  • a hand stitched or machine stitched inflatable ball made from seamless bladder, - wherein the seamless bladder comprises a bladder body made from carboxylated acrylonitrile butadiene latex and no other latex, and
  • the bladder body is provided with at least one coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex.
  • the present invention relates to
  • a hand stitched or machine stitched inflatable ball made from seamless bladder, wherein the seamless bladder comprises a bladder body made from carboxylated acrylonitrile butadiene latex and no other latex, and
  • the bladder body is provided with at least one coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex, and
  • the seamless bladder body is provided with a valve body.
  • valve body is adhered or bonded to said seamless bladder body with at least one coating of natural rubber based adhesive.
  • the present invention also relates to
  • a ball comprising:
  • the seamless bladder comprises
  • a bladder body made from carboxylated acrylonitrile butadiene latex and no other latex, and the bladder body is provided with at least one coating of a material selected from group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex, and
  • valve body is provided with at least one coating consisting of natural rubber based adhesive
  • valve body is adhered or bonded with (or to) the bladder body.
  • the seamless bladder of present invention has been found to have judicious combination of good air retention characteristics and good bounce characteristics without sacrificing one property for the another property, and has been found suitable for hand stitched and machine stitched inflatable balls.
  • the advantages of present invention include avoiding repeated coatings of primer and neoprene rubber adhesive onto the bladder body before adhering or bonding the valve body thereon.
  • the seamless bladder provided with valve body of present invention has been found to be suitable for hand stitched and machine stitched inflatable balls, and found to have judicious combination of good air retention characteristics and good bounce characteristics without sacrificing one property for the another property.
  • the present invention also relates to hand stitched and machine stitched inflatable ball comprising:
  • seamless bladder body made from carboxylated acrylonitrile butadiene latex and no other latex, wherein said bladder body consisting of carboxylated acrylonitrile butadiene latex is provided with at least one coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex, and ii) valve body adhered or bonded to said seamless bladder body, wherein the valve body is adhered or bonded to the bladder body with at least one coating consisting of natural rubber based adhesive.
  • the coating of a material selected from a group consisting of compounded neoprene latex [NL] and adhesive grade neoprene latex on the bladder body of the ball of present invention is of thickness varying from about 0.02 mm to about 0.20 mm, preferably the coating is of thickness varying from about 0.03 mm to about 0.15 mm.
  • the coating consisting of natural rubber based adhesive on the valve body of the ball of present invention is of thickness varying from about 0.005 mm to about 0.03 mm, preferably the coating is of thickness varying from about 0.01 mm to about 0.015 mm.
  • the advantages of present invention include avoiding repeated coatings of primer and neoprene rubber adhesive onto the bladder body before adhering or bonding the valve body thereon, and fitting the bladder body with valve body into the hand stitched and machine stitched inflatable ball body covering.
  • the present invention also relates to a process for manufacture of a seamless bladder having improved adhesion for valve body or improved capability to bond with valve body, wherein the process comprises steps of:
  • step - G) is performed after additional process steps of:- i) dipping the dried CABL latex coated films from step - F) into coagulant bath of step - C;
  • step ii) drying the coagulant coated film of step - i) as per above step - D); iii) dipping the dried coagulant coated film from step - ii) into neoprene latex bath;
  • latex bath of step - E) consists of carboxylated acrylonitrile butadiene latex and no other latex;
  • the neoprene latex of step - iii) is selected from group consisting of compounded neoprene latex and adhesive grade neoprene latex.
  • the present invention also relates to a process for preparation of a seamless bladder for an inflatable ball, wherein valve body is adhered or bonded to seamless bladder body, and wherein seamless bladder body is made from carboxylated acrylonitrile butadiene latex and no other latex and is provided with coating of compounded neoprene latex [NL] or of adhesive grade neoprene latex.
  • the valve body is adhered or bonded to said seamless bladder body with coating of natural rubber based adhesive.
  • the present invention relates to a process for manufacturing of a bladder, wherein it does not get tear-off from its neck during stripping from a mould, and hence, it does not have stripping problem.
  • the present invention relates to a process for manufacturing a bladder, wherein it does not have drying problem, and therefore, does not have cracks in the bladder.
  • the process steps of dipping in coagulant bath and latex bath may be repeated more than once, preferably it is repeated twice.
  • the advantages of process of present invention include avoiding repeated steps of coating of primer and neoprene rubber adhesive, and repeated steps of heating thereof to dry the coatings, and therefore, overcomes above-described problems of industrial production of inflatable football from bladder of PCT'85.
  • the process step of dipping the moulds in a coagulant bath in above step - C) is carried out while these are hot and having a temperature varying from about 50°C to 70°C, and the coagulant bath is maintained at a temperature varying from about 20°C to about 80°C.
  • the process step of dipping the dried and coagulant coated formers (in above step - E)) in a compounded latex bath of carboxylated acrylonitrile butadiene latex is carried out when it is maintained at a temperature varying from about 10°C to 30°C.
  • the process step of dipping the dried and coagulant coated film from above step - ii) into neoprene latex bath is carried out when it is maintained at a temperature varying from about 10°C to 30°C, and this step is preferably carried out for about 5 seconds to about 2 minutes.
  • the neoprene latex is compounded neoprene latex.
  • the [first] coagulant bath for first dip comprises :- coagulating agent varying from about 10 parts to about 90 parts by weight of the total weight of the bath composition;
  • parting agent varying from about 2 parts to about 8 parts by weight of the total weight of the bath composition
  • a wetting agent varying from about 0.01 parts to about 0.5 parts by weight of the total weight of the bath composition; and optionally comprising a conventional defoamer or surface active agent varying from about 0.01 parts to about 0.5 parts by weight of the total weight of the bath composition;
  • the coagulant bath for first dip comprises:- coagulating agent, which is preferably calcium chloride or calcium nitrate;
  • - parting agent which is preferably bentonite clay
  • the [second] coagulant bath for second or subsequent dips comprises :- coagulating agent varying from about 10 parts to about 90 parts by weight of the total weight of the bath composition; and
  • - optionally comprises a wetting agent varying from about 0.01 parts to about 0.5 parts by weight of the total weight of the bath composition; and optionally comprises a conventional defoamer or surface active agent varying from about 0.01 parts to about 0.5 parts by weight of the total weight of the bath composition;
  • the coagulant bath for second or subsequent dips comprises:- coagulating agent, which is preferably calcium chloride or calcium nitrate; and
  • - optionally comprises a wetting agent, which is preferably non-ionic group.
  • the carboxylated acrylonitrile butadiene latex bath for all dips comprises dry parts of:- carboxylated acrylonitrile butadiene latex about 100 phr [per hundred rubber]; - ph modifier varying from about 0.3 to about 0.8 phr;
  • surfactants varying from about 0.1 to about 3.0 phr;
  • activator and vulcanizing agent varying from about 0.5 to about 5 phr;
  • ultra fast accelerator varying from about 1 to about 3 phr
  • vulcanizing agent varying from about 0.25 to about 3.0 phr;
  • antioxident varying from about 1 to about 3 phr
  • the carboxylated acrylonitrile butadiene latex bath for all dips comprises:- a ph modifier which is preferably about 2 to 3% potassium hydroxide [KOH] solution;
  • a surfactant which is selected from a group comprising anionic group; an activator and vulcanizing agent which is preferably 50% dispersion of zinc oxide;
  • an ultra fast accelerator which is preferably 50% dispersion of zinc diethyl dithiocarbamate [ZDEC] or of zinc dibutyl dithiocarbamate [ZDBC];
  • a vulcanizing agent which is preferably 50% dispersion of sulphur or 33% dispersion of diphenilthiourea [DPTU];
  • plasticizer which is preferably 50% emulsion of dioctylephthalate
  • a antioxidant which is preferably 50% dispersion or emulsion of phenol, amine, aniline or hydroquinone.
  • the parting agent is not added in the second coagulant bath which has been found to have advantage of avoiding delamination of the subsequent film.
  • the carboxylated acrylonitrile butadiene latex is characterized by:- acrylonitrile copolymer with medium or high acrylonitrile level varying from about 26% to about 39%;
  • pH value varying from about 7.5 to about 8.5
  • the compounded neoprene latex comprises:
  • Antioxidant about 0.5-2 phr
  • Accelerator-II about 0.2-1 phr
  • the neoprene latex is preferably film grade
  • the stabilizer is preferably lissapol D paste (a sulphated fatty alcohol) which is preferably taken as 20% solution,
  • the antioxidant is preferably TQ- (polymerized 1,2 dihydro 2,2,4-trimethyl quinoline),
  • the activator is preferably zinc oxide which is preferably taken as 50% dispersion
  • the Accelerator-I is preferably zinc diethyl dithiocarbamate [ZDC] which is preferably taken as 50% dispersion
  • the Accelerator-II is preferably diphenyl thiourea [DPTU] which is preferably taken as 25% dispersion.
  • the water preferably distilled water is added to the compounded neoprene latex to reduce or adjust its viscosity.
  • the concentration of neoprene latex bath preferably varies from about 20 to about 40% (DRC).
  • the coagulant latex bath composition and concentration thereof for neoprene latex bath is same as that of CABL coagulant bath.
  • the moulds [or formers] are rinsed in a weak acid bath of an acid selected from acetic acid or nitric acid having acid bath concentration varying from about 2% to 4% by weight in luke warm water.
  • the rinsed formers obtained from preceding process step are dipped in hot water maintained at a temperature varying from about 40°C to about 90°C to heat the moulds [formers] and to further clean them by removal of acid traces therefrom.
  • the coagulant coated formers obtained from preceding process step are dried in hot air tunnel for a duration varying from about 15 sec to 5 min or at room temperature till the formers get fully dried.
  • the second or subsequent coagulant coated latex films obtained from preceding process step are dried in hot air tunnel for a duration varying from about 15 sec to 15 min or at room temperature till the films get fully dried.
  • the substantially dried latex coated coagulated film obtained from preceding process step is subjected to process steps of beading onto neck portion of the former to form a bead which has been found to facilitate its easy stripping without tearing-off at the neck portion followed by leaching in hot water bath to remove excess of unwanted chemicals.
  • the vulcanized bladders are subjected to accelerated cooling and washing by sprinkling of cold water for a period varying from about 5 to about 10 min.
  • the cooled and washed bladder shells are striped manually from the respective moulds [formers].
  • the bladder shells are washed with luke warm water in a centrifuge chamber at a temperature varying from 40°C to 60°C to remove clay and other unwanted material.
  • the washed bladder shells are dried in hot air tumbler for about 30 to 180 min at a temperature varying from 50°C to 100°C to remove water contents therefrom.
  • the valve body is fixed onto the bladder shells, preferably at the neck portion and it is sealed to provide air tight joint and to form a bladder suitable for an inflatable ball.
  • the inventors have found that the football made from the bladder of carboxylated acrylonitrile butadiene latex having a coating of compounded neoprene latex [NL] or of adhesive grade neoprene latex provided with a valve body having a coating of natural rubber based adhesive has judicious combination of good air retention characteristics as well as good bounce characteristics without sacrificing one property for the another property.
  • the inventors have also found substantial reduction in problems and risk of rejection during buffing of the bladder of present invention before adhering or bonding the valve body thereon. Therefore, the advantages of present invention include additional gain by substantial reduction of loss of production due to rejection during buffing.
  • the inventors have found that when a test piece of about 25mm wide and about 152.4mm long having on one end an opening of about 25mm, angle of separation during peeling of about 180°, was tested on a tensile testing machine of about 250Kg, wherein the speed is kept constant and the load taken to separate the test piece upto about 25mm is recorded, the rate of movement of transverse driven grip is kept at about 50 + 5cm per minute, the adhesion property of valve body onto the bladder body of the ball made as per present invention and as per invention of PCT'85 (the comparative sample), as provided in Table - I, clearly and unambiguously, confirm that adhesion property of the ball made as per present invention is, surprisingly and unexpectedly, substantially increased by an average of about 32.22% in-addition to having advantages of the overall manufacturing process of present invention being easy and simple (i.e. having less number of process steps), and having favourable economics.
  • advantages of present invention include substantially reduced production cost by reducing process time, process cost and rejection rate, and by increasing the productivity, and the bladder is still suitable for hand stitched as. well as machine stitched inflatable balls, and has judicious combination of good air retention characteristics as well as good bounce characteristics without sacrificing one property for the another property.

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  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Diaphragms And Bellows (AREA)

Abstract

L'invention concerne une vessie sans couture à adhésion améliorée pour corps de soupape et à capacité de liaison améliorée avec le corps de soupape. La vessie comprend un corps en latex acrylonitrile butadiène carboxylé doté d'au moins un revêtement de matériau sélectionné dans le groupe constitué par le latex de néoprène mélangé (NL) et le latex de néoprène à qualité adhésive. Dans un mode de réalisation, l'invention concerne également un procédé de fabrication de la vessie. Dans un autre mode de réalisation, l'invention concerne un ballon gonflable produit à partir du procédé.
PCT/IN2012/000564 2011-08-29 2012-08-23 Vessie sans couture en latex acrylonitrile butadiène carboxylé à adhésion améliorée pour corps de soupape et son procédé de fabrication WO2013030849A1 (fr)

Applications Claiming Priority (2)

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IN2460/DEL/2011 2011-08-29
IN2460DE2011 2011-08-29

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WO2013030849A1 true WO2013030849A1 (fr) 2013-03-07

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191375A (en) 1977-04-13 1980-03-04 Gala, Narodni Podnik Game ball and method of making same
US4513058A (en) * 1984-04-17 1985-04-23 Wilson Sporting Goods Co. Impact resistant high air retention bladders
US4830373A (en) 1987-12-16 1989-05-16 Rudolf Dehnert Soccer ball
US5772545A (en) 1996-12-20 1998-06-30 Ou; Tsung Ming Sportsball and manufacturing method thereof
WO2003006513A1 (fr) * 2001-07-11 2003-01-23 Best Manufacturing Company Formulations de latex sans accelerateur, procede de fabrication et articles correspondants
US6793597B2 (en) 2002-09-12 2004-09-21 Jarrar Hussain Awan Machine stitched soccer balls with floating bladder
WO2008107914A2 (fr) * 2007-03-06 2008-09-12 Paradise Rubber Industries Vessie stratifiée sans couture en latex acrylonitrile butadiène carboxyle et son procédé de fabrication

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191375A (en) 1977-04-13 1980-03-04 Gala, Narodni Podnik Game ball and method of making same
US4513058A (en) * 1984-04-17 1985-04-23 Wilson Sporting Goods Co. Impact resistant high air retention bladders
US4830373A (en) 1987-12-16 1989-05-16 Rudolf Dehnert Soccer ball
US5772545A (en) 1996-12-20 1998-06-30 Ou; Tsung Ming Sportsball and manufacturing method thereof
US6390941B1 (en) 1996-12-20 2002-05-21 Tsung Ming Ou Sportsball
WO2003006513A1 (fr) * 2001-07-11 2003-01-23 Best Manufacturing Company Formulations de latex sans accelerateur, procede de fabrication et articles correspondants
US6793597B2 (en) 2002-09-12 2004-09-21 Jarrar Hussain Awan Machine stitched soccer balls with floating bladder
WO2008107914A2 (fr) * 2007-03-06 2008-09-12 Paradise Rubber Industries Vessie stratifiée sans couture en latex acrylonitrile butadiène carboxyle et son procédé de fabrication

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