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WO2006008645A2 - Composition superabsorbante - Google Patents

Composition superabsorbante Download PDF

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Publication number
WO2006008645A2
WO2006008645A2 PCT/IB2005/002201 IB2005002201W WO2006008645A2 WO 2006008645 A2 WO2006008645 A2 WO 2006008645A2 IB 2005002201 W IB2005002201 W IB 2005002201W WO 2006008645 A2 WO2006008645 A2 WO 2006008645A2
Authority
WO
WIPO (PCT)
Prior art keywords
silica
superabsorbent
pbw
water
formulation according
Prior art date
Application number
PCT/IB2005/002201
Other languages
English (en)
Other versions
WO2006008645A3 (fr
Inventor
Graham Steer
Original Assignee
Sp Healthcare Limited
Holmes, Miles
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 Sp Healthcare Limited, Holmes, Miles filed Critical Sp Healthcare Limited
Publication of WO2006008645A2 publication Critical patent/WO2006008645A2/fr
Publication of WO2006008645A3 publication Critical patent/WO2006008645A3/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/20—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/18—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3206—Organic carriers, supports or substrates
    • B01J20/3208—Polymeric carriers, supports or substrates
    • B01J20/321—Polymeric carriers, supports or substrates consisting of a polymer obtained by reactions involving only carbon to carbon unsaturated bonds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/12—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
    • C08L101/14—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity the macromolecular compounds being water soluble or water swellable, e.g. aqueous gels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/50—Aspects relating to the use of sorbent or filter aid materials
    • B01J2220/68—Superabsorbents

Definitions

  • This invention relates to a so-called superabsorbent material, and to a method of producing the material.
  • the invention is especially suitable for absorbing liquid matter excreted by the body (e.g. for use in the fields of ostomy, diaper, personal hygiene, incontinence or woundcare), and/or for absorbing aqueous matter, but it is not limited exclusively to these fields.
  • GB-A-2301350 and EP-A-0891758 describe superabsorbent formulations and methods of producing articles containing superabsorbent material.
  • a significant aspect of the superabsorbent formulation is the inclusion of glycerol and water, which binds the superabsorbent powder granules together when compressed, to form a consolidated mass.
  • the superabsorbent material can be formed into tablets, or compressed between upper and lower layers to form a sheet-like product.
  • the stability of the consolidated structure depends on the amount of water and glycerol in the composition. Increasing the amount of water and glycerol can increase the physical stability. However, there are practical limits on the amount of water and glyercol that can be mixed with the superabsorbent, because the superabsorbent begins to gel when mixed with significant amounts of water and glycerol, and thereby loses its desirable powder structure. Such limitations on the amount of water and glyerocl have limited the structural stability which has been achieved hitherto, and make the conventional product vulnerable to at least some degree of shedding (particularly at the edges). Also, articles made of the material tend not to be flexible, and may shed material if bent or flexed.
  • EP 0629411 describes a formulation containing superabsorbent and non- porous silica.
  • one aspect of the invention is to include silica in a formulation including superabsorbent material (e.g. powder or granules).
  • the silica may act as a lubricant, enabling the superabsorbent particles to flow more easily, thus making handling of the superabsorbent particles easier, and leading to easier mixing and compressing processes; and
  • the silica be or comprise porous silica.
  • An effect of porous silica may be that it may have an excellent absorptive capacity for pulling in water and/or a non-volatile lubricious polyhydroxy compound (e.g. glycerol) between (e.g., around, and surface) the superabsorbent granules. This enables an increase in the amount of water and the non-volatile lubricious polyhydroxy compound that can be mixed with the superabsorbent material without gelling the superabsorbent.
  • a non-volatile lubricious polyhydroxy compound e.g. glycerol
  • the amount of silica present is at least 3 parts, more preferably at least 4 parts, more preferably at least 5 parts, more preferably at least 6 parts, more preferably at least 7 parts, and in one form at least 8 parts.
  • the amount may be at least 9 parts, or at least 10 parts, or at least 11 parts, or at least 12 parts, or at least 13 parts, or at least 14 parts, or at least 15 parts, or at least 16 parts, or at least 17 parts, or at least 18 parts or at least 19 parts.
  • the amount of silica present is not greater than 20 parts, more preferably not greater than 15 parts, more preferably not greater than 10 parts and, in one form, not greater than 8 parts.
  • the amount be not greater than 19 parts, or not greater than 18 parts, or not greater than 17 parts, or not greater than 16 parts, or not greater than 15 parts, or not greater than 14 parts, or not greater than 13 parts, or not greater than 12 parts, or not greater than 11 parts, or not greater than 10 parts, or not greater than 9 parts.
  • the optimum amount of silica may depend to some extent on the size and surface area of the particles of superabsorbent. Generally, it is preferred that the silica be present in such a quantity to provide a surface coating on substantially all of the superabsorbent particles. Preferably, each particle is substantially entirely coated. It will be appreciated that a smaller particle size results in a larger surface area to be coated per unit volume, thus requiring a greater quantity of silica for optimum effect.
  • the superabsorbent particles may comprise an alkali metal polyacrylate (e.g. sodium polyacrylate), or some other polyacrylate, or other material which provides superabsorbent properties (defined generally as the ability to absorb many times their own weight of liquid matter).
  • alkali metal polyacrylate e.g. sodium polyacrylate
  • Suitable materials include for example, water-swellable polymers.
  • the formulation includes glycerol.
  • another non- volatile lubricious polyhydroxy compound may be used which is water-soluble or water-dispersible at or below 4O 0 C and is liquid at room temperature (15 to 20 0 C).
  • Suitable other compounds include, for example: propane 1-2 diol; polyethylene glycol 200 (or 300); or sorbitol.
  • the amount of glycerol (or other material) is 5-50 parts per 100 parts of the superabsorbent material, more preferably 5-40 parts, more preferably 5-30 parts, more preferably 10-25 parts. In one embodiment, the amount of glycerol (or other material) is between 12 and 18 parts per 100 parts of superabsorbent.
  • the glyercol (or other material) may remain substantially not cross-linked with the superabsorbent.
  • the formulation also includes water.
  • the water is present in an amount of 0.5 to 15 parts by weight per 100 parts of superabsorbent, more preferably 0.5 to 8 parts, and more preferably 0.5 to 6 parts. In one example, the amount of water is between 3 and 5 parts.
  • the formulation may also include additives, for example, a malodour counteractant.
  • the invention provides a method of producing an absorbent material, the method comprising:
  • step (b) adding to the mixture from step (a) a cohesive formulation to make the mixture consolidatable.
  • the silica be or comprise porous silica.
  • the silica and superabsorbent particles are mixed to provide a mixture in which substantially all of the superabsorbent particles are coated with silica.
  • the particles are substantially entirely coated with silica.
  • the cohesive formulation is added after the mixing in step (a) is carried out.
  • the cohesive formulation includes glycerol and water.
  • glycerol may be used another non-volatile lubricious polyhydroxy compound which is water-soluble or water-dispersible at or below 4O 0 C and is liquid at room temperature (15 to 2O 0 C).
  • the formulation may be structurally consolidated by application of pressure.
  • the glycerol formulation may have excellent cohesive strength which can reduce undesirable shedding of material.
  • Fig. 1 is a schematic flow diagram showing a production process for producing an absorbent material
  • Figs. 2a and 2b are schematic drawings showing the superabsorbent granules before (a) and after (b) mixing with silica;
  • Fig. 3 is a schematic drawing of apparatus for consolidating the material to form shaped articles.
  • An example superabsorbent formulation may comprise, in parts by weight (pbw):
  • a suitable superabsorbent material is, for example, sodium polyacrylate available under trade name HySorb from BASF.
  • Sodium polyacrylate superabsorbent materials are also available from Dow Chemicals and from Stockhausen.
  • a suitable silica material is or comprises porous silica.
  • Porous silica may be formed by a precipitation process.
  • a precipitated silica may be produced from a water glass solution to which sulphuric acid is added under certain conditions. The silica develops in the aqueous phase.
  • the precipitated silica may be washed out and dried by a suitable drying process, for example, by spray drying.
  • Suitable porous silica materials may be available from Degussa (under trade name Sipernat), Grace Davison (under trade name Perkasil), lneos (under trade name Gasil), PPG industries (under trade name Flo-Gard) and Rhodia (under trade name Tixosil).
  • the formulation is prepared in first and second stages 10 and 12.
  • the first stage is to mix together the superabsorbent granules and the silica.
  • Fig. 2a shows the superabsorbent granules 14 prior to mixing
  • Fig. 2b shows the granules 14 after mixing.
  • the effect of mixing is to coat the granules 14 with a thin coating of silica 16.
  • the silica 16 acts as a lubricant making the granules easier to flow, and therefore easier to mix.
  • the second stage 12 is to add a premix of glycerol and water to the silica coated superabsorbent formulation.
  • the effect of the porous silica is generally to enable a greater quantity of glycerol/water to be mixed with the superabsorbent, without gelling the superabsorbent, than if the silica were absent. It is believed that this is as a result of the porous silica pulling in and absorbing the water/glycerol outside the superabsorbent powder granules.
  • the optimum quantity of silica may depend at least to some extent on the size of the superabsorbent granules 14. It is preferred that the quantity of silica be sufficient to coat substantially the entire surface of the superabsorbent particles 14.
  • the formulation is mixed to a powder consistency.
  • the superabsorbent formulation can be formed into a desired shaped article by compression, which consolidates the powder structurally, in the same manner as that described in GB-A-2301350 and EP-A-0891758 referred to hereinbefore.
  • the presence of the glycerol/water (particularly in the higher quantity than that attainable hitherto) enables the mixture to be compressed at room temperature with only relatively mild pressure being required. In most cases no other heat is required.
  • the increased quantity of glycerol/water provides greater structural stability than that achievable hitherto, so that the formed article is less prone to shedding, and can be flexible .
  • Fig. 3 illustrates, by way of example, apparatus 18 for forming a sheet of superabsorbent, suitable for use in ostomy, incontinence or woundcare applications.
  • the powder formulation is fed from a supply 20 onto a travelling sheet 21 of tissue paper which is pulled off a supply roll 22.
  • a second (overhead) sheet 23 of tissue paper is fed from a second supply roll 24 and these two sheets sandwich the powder between them.
  • the product passes between a first pair of rolls 26 which form a first nip 27 and to a second pair of rolls 28 forming a second nip 29.
  • the inter-roll spacing at the second nip 29 may be for example 0.1 to 2.0 mm. That at the first nip 27 may be 0.75 to 4 mm.
  • the resulting product is a flat sheet 31 which can be converted to roll-stock for later conversion or cut into suitable shapes, e.g. rectangles 32, and can be directly placed in personal hygiene, diaper, ostomy or incontinence products. It has been found to rapidly absorb a liquid such as urine. In tests, over 60 ml of synthetic urine were absorbed in under 60 seconds, usually under 40 seconds, by a product of one square centimetre area and 2 mm thickness made by the method described above.
  • the sheet may be processed during production to form packet-like articles, as described in EP-A-0891758.
  • malodour counteractants One example of a malodour counteractant is a bactericide, e.g. benzyl alkonium chloride. Another example is a fragrance. Other examples are included in a range of bactericides manufactured by ConvaTec
  • malodour counteractants which may be used are methylchlorosiothiazolinone, methylisothiazolinone, or denatonium benzoate.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Hematology (AREA)
  • Dispersion Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Cette invention concerne une composition superabsorbante comprenant un superabsorbant (100pbw), de la silice (3-20 pbw), de l'eau (0,5-15pbw) et du glycérol (5-50pbw). La silice est constituée par de la silice poreuse ou bien en contient. La silice enrobe sensiblement les particules superabsorbantes et absorbe l'eau et le glycérol.
PCT/IB2005/002201 2004-07-14 2005-07-14 Composition superabsorbante WO2006008645A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0415643A GB2417031A (en) 2004-07-14 2004-07-14 Superabsorbent composition
GB0415643.6 2004-07-14

Publications (2)

Publication Number Publication Date
WO2006008645A2 true WO2006008645A2 (fr) 2006-01-26
WO2006008645A3 WO2006008645A3 (fr) 2006-05-18

Family

ID=32893489

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/002201 WO2006008645A2 (fr) 2004-07-14 2005-07-14 Composition superabsorbante

Country Status (2)

Country Link
GB (1) GB2417031A (fr)
WO (1) WO2006008645A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11345878B2 (en) * 2018-04-03 2022-05-31 Novaflux Inc. Cleaning composition with superabsorbent polymer
US11680226B2 (en) 2016-09-30 2023-06-20 Novaflux, Inc.. Compositions for cleaning and decontamination
US11918677B2 (en) 2019-10-03 2024-03-05 Protegera, Inc. Oral cavity cleaning composition method and apparatus
US12064495B2 (en) 2019-10-03 2024-08-20 Protegera, Inc. Oral cavity cleaning composition, method, and apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993017066A1 (fr) * 1992-02-20 1993-09-02 Allied Colloids Limited Polymeres absorbants et leur preparation
US6720073B2 (en) * 2000-04-07 2004-04-13 Kimberly-Clark Worldwide, Inc. Material enhancement to maintain high absorbent capacity under high loads following rigorous process conditions
ES2216822T3 (es) * 2000-04-13 2004-11-01 Bristol-Myers Squibb Company Material absorbente y metodo de produccion.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11680226B2 (en) 2016-09-30 2023-06-20 Novaflux, Inc.. Compositions for cleaning and decontamination
US11345878B2 (en) * 2018-04-03 2022-05-31 Novaflux Inc. Cleaning composition with superabsorbent polymer
US12060539B2 (en) 2018-04-03 2024-08-13 Novaflux Inc. Cleaning composition with superabsorbent polymer
US11918677B2 (en) 2019-10-03 2024-03-05 Protegera, Inc. Oral cavity cleaning composition method and apparatus
US12064495B2 (en) 2019-10-03 2024-08-20 Protegera, Inc. Oral cavity cleaning composition, method, and apparatus

Also Published As

Publication number Publication date
GB2417031A (en) 2006-02-15
WO2006008645A3 (fr) 2006-05-18
GB0415643D0 (en) 2004-08-18

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