WO2001045758A1 - Polymeres a faible capacite d'absorption et a haute permeabilite - Google Patents

Polymeres a faible capacite d'absorption et a haute permeabilite Download PDF

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Publication number
WO2001045758A1
WO2001045758A1 PCT/US2000/035082 US0035082W WO0145758A1 WO 2001045758 A1 WO2001045758 A1 WO 2001045758A1 US 0035082 W US0035082 W US 0035082W WO 0145758 A1 WO0145758 A1 WO 0145758A1
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WO
WIPO (PCT)
Prior art keywords
polymer
glycol
crosslinking agent
water
crosslinking
Prior art date
Application number
PCT/US2000/035082
Other languages
English (en)
Inventor
Joseph L. Weir
Fredric L. Buchholz
Stephen B. Christensen
Andrew T. Graham
Original Assignee
The Dow Chemical Company
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Filing date
Publication date
Application filed by The Dow Chemical Company filed Critical The Dow Chemical Company
Priority to JP2001546697A priority Critical patent/JP2003518150A/ja
Priority to EP00989437A priority patent/EP1244474A1/fr
Priority to KR1020027008058A priority patent/KR20020064953A/ko
Publication of WO2001045758A1 publication Critical patent/WO2001045758A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C08J3/243—Two or more independent types of crosslinking for one or more polymers
    • 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
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/14—Water soluble or water swellable polymers, e.g. aqueous gels

Definitions

  • This invention relates to superabsorbent polymer (SAP) compositions and a process for preparing said compositions
  • Superabsorbent polymers are well-known materials that commonly are used in personal care articles such as diapers. These polymers are known to absorb several times their weight of. for example, water, saline solution, urine, blood, and serous bodily fluids.
  • Gel blocking is a well-known problem associated with the use of superabsorbent polymers in absorbent articles, such as diapers. Gel blocking occurs when rapid expansion of superabsorbent polymer particles around the point of entry of body fluid into an absorbent article causes a closing of the interstitial spaces and pores in the SAP-fluff matrix. Since the transport of liquid by diffusion through a swollen hydrogel is much slower than transport through the interstitial spaces, a sealing effect occurs in the area of fluid entry This effect is referred to as "gel blocking " Subsequent amounts of fluid can no longer penetrate into the absorbent core and tend to flow in an uncontrolled manner across the surface of the already superficially saturated area to its edge, resulting in undesirable leakage from the absorbent article
  • One way of combating gel blocking is to increase the permeability of the superabsorbent polymer gel bed. Since superabsorbent polymers with lower absorption capacities tend to have higher permeability, another way of combating gel blocking is to decrease the absorption capacity of the superabsorbent polymer.
  • the absorption capacity of the superabsorbent polymer is a function of the amount of polyvinyl crosslinking agent added during the polymerization (see Buchholz. F.L. and Graham, A T . "Modern Superabsorbent Polymer Technology," John Wiley & Sons, 1998), with greater amounts of polyvinyl crosshnker giving lower levels of absorption capacity.
  • polyvinyl crosslinking agents are too expensive to use in large amounts. Additional process steps, such as particle surface crosslinking steps, have associated disadvantages such as extra capital and operating costs.
  • water-soluble carboxyhc acid-containing polymers can be crosslinked by means of este ⁇ fication with, for example, relatively inexpensive polyhydroxy substances. Sometimes this is referred to as curing.
  • Other reactions are also known for this purpose, such as amidation of the carboxyhc acid- containing polymer with a polyamine substance
  • these este ⁇ fication type reactions require dehydrating conditions, and do not readily occur dunng the polymerization step of the process due to the high water content of the reaction solution. Rather these dehydrating reactions occur mostly during the drying step of the process
  • WO 95/26209 discloses that the gel bed permeability can be increased by using a larger particle size distribution and by using surface crosslinked superabsorbent polymers Unfortunately, preparing surface crosslinked superabsorbent polymer entails additional process steps, thereby adding to the manufacturing costs of the superabsorbent polymer
  • the present invention includes an improved process for the preparation of superabsorbent polymers having high gel bed permeability and low absorption capacity, and the polymers prepared by the process More specifically, the process is a process for the preparation of water-swellable. water-insoluble polymer particles having high gel bed permeability and low absorption capacity, the process comprising crosslinking the polymer using at least two covalent crosslinking agents under conditions such that there is formed a polymer that is substantially uniformly crosslinked and that has a gel bed permeability of at least 5 x 10 9 cm 2 and an absorption capacity of less than 26 g/g
  • the polymer of the invention is the polymer prepared by the process of the invention
  • the present invention includes articles containing the high permeability, low absorption capacity polymer
  • the two covalent crosslinking agents include a first crosslinking agent, which is a polyvinyl compound, and a second crosslinking agent, which is a hydroxyl- containing crosslinking compound.
  • the two covalent crosslinking agents crosslink the carboxyhc acid-containing polymer in essentially separate stages of the polymer preparation process, namely, the polymerization stage for the first crosslinking agent and the heated drying stage for the second crosslinking agent.
  • Exemplary first crosslinking agents include: diacrylates and dimethacrylates of ethylene glycol, diethylene glycol, triethylene glycol. propylene glycol, 1 ,4-butanediol. 1 ,5-pentanediol.
  • 1.6-hexanediol, neopentyl glycol, trimethylolpropane and pentaerythritol triacrylates and trimethacrylates of trimethylolpropane and pentaerythritol; highly ethoxylated trimethylol propane triacrylate; tetracrylate and tetramethacrylate of pentaerythritol: ally! methacrylate; and tetraallyloxyethane.
  • the second covalent crosslinking agent suitably is a hydroxyl-containing crosslinking agent containing at least one hydroxyl functionality suitable to react with a carboxyl moiety on the backbone of the water-swellable, water-insoluble polymer; provided, however, that the second covalent crosslinking agent has at least two functional groups capable of forming covalent bonds with the superabsorbent polymer.
  • the hydroxyl functionality of the second crosslinking agent is activated by heating the polymer to make an ester with the hydroxyl functionality, for example, during the drying process.
  • This second crosshnker may be a polyol and contain more than one hydroxyl functionality to achieve crosslinking.
  • the second crosshnker may be a so-called dimodal crosshnker, and employ one or more hydroxyl groups with one or more ethylenically unsaturated groups in the same agent.
  • Mixtures of second crosslinking agents can be employed.
  • polyhydroxy compounds suitable for use as the second crosslinking agent include, but are not limited to, glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,4-butanediol, 1.5-pentanediol, 1 ,6-hexanediol, neopentyl glycol, polyglycerin, trimethylolpropane, polyethylene glycol. and polypropylene glycol-polyethylene glycol copolymers.
  • dimodal agents suitable for use as the second crosshnker include, but are not limited to. 2-hydroxyethyl (meth)acrylate.
  • the second crosshnker may be added during the makeup of the monomer mix or at any subsequent stage of the process prior to the drying step of the polymer gel, and serves to crosslink the polymer during or after the drying step
  • Both the first and second crosslinking agents are employed as bulk, as opposed to surface, crosslinking agents
  • the polymers of the invention are substantially homogeneously crosslinked, or bulk crosslinked, as opposed to being surface crosslinked
  • a relatively low absorption capacity superabsorbent polymer may be prepared without the excessive expense of using large amounts of a more costly polyvinyl crosslinking agent, without the use of expensive surface crosslinking processes and capital outlays, and while avoiding the process handling difficulties of crosslinking an essentially soluble polymer with a curing-like reaction
  • a further surface crosslinking step can optionally be employed in the process of the invention, if further modification of polymer properties is desired
  • both the first covalent crosslinking agent and the second covalent crosslinking agent are present in the polymerization mixture to prepare the polymer of the invention
  • the polyol crosslinking agent can be added to the polymer hydrogel after polymerization is complete or substantially complete but prior to drying of the hydrogel
  • the total amount of crosslinking agents to employ generally is determined by the desired degree of gel bed permeability
  • the crosslinking agents preferably are present in an amount effective to produce a polymer having a gel bed permeability of at least 5 x 10 9 cm " and a absorption capacity of less than 26 g/g If the total amount of crosslinking agents employed is an amount less than 0 0005 part by weight per 100 parts monomer, the gel bed permeability of the polymer usually is too low and the absorption capacity of the polymer too high
  • the first crosslinking agent suitably is employed in amounts ranging from 0 0005 to 5 parts by weight per 100 parts by weight of ⁇ , ⁇ -ethylen ⁇ cally unsaturated monomer used More preferably, the amount of the first crosslinking agent ranges from 0 1 to 1 part by weight per 100 parts by weight of the ⁇ , ⁇ -ethylen ⁇ cally unsaturated monomer
  • the second crosslinking agent suitably is employed in amounts ranging from 0 0005 to 5 parts by
  • the hydrophilic polymers of the invention can be prepared from water- soluble ⁇ , ⁇ -ethylenically unsaturated monomers such as monocarboxylic acids, polycarboxylic acids, acrylamide and their derivatives.
  • suitable monomers for the preparation of the polymer of the invention include ⁇ , ⁇ -ethylenically unsaturated monomers such as. for example, acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid and alkali metal salts and ammonium salts thereof; itaconic acid, acrylamide, methacrylamide and 2-acrylamido-2-methyl- 1 -propane sulfonic acid and its salts.
  • Preferred monomers include acrylic acid and methacrylic acid and their respective salt forms, such as alkali metal or ammonium salts.
  • the water-soluble monomers useful in the present invention may be used in amounts ranging from 10 percent to 80 percent by weight based on the total weight of the aqueous monomer solution. Preferably, the amount ranges from 15 percent to 60 percent based on the total weight of the aqueous monomer solution.
  • water absorbent polymer such as alkyl esters of the acid monomers, for example, methyl acrylate or methyl methacrylate may be present in the water absorbent polymer.
  • certain grafting polymers such as, for example, polyvinyl alcohol, starch and water soluble or swellable cellulose ethers may be employed to prepare products having superior properties. Such grafting polymers, when employed, are used in amounts up to 10 weight percent based on the ⁇ , ⁇ -ethylenically unsaturated monomer.
  • the polymerization may be carried out using acid monomers that are not neutralized or that have been neutralized or partially neutralized prior to the polymerization.
  • Neutralization is conveniently achieved by contacting the aqueous monomer with an amount of basic material sufficient to neutralize between 20 and 95 percent of the acid groups present in the acid monomers.
  • the amount of basic material will be sufficient to neutralize between 40 percent and 85 percent, and most preferably between 55 percent and 75 percent of the acid groups present in the acid monomers.
  • Compounds which are useful to neutralize the acid groups of the monomer are typically those which will sufficiently neutralize the acid groups without having a detrimental effect on the polymerization process.
  • Examples of such compounds include alkali metal hydroxides, and alkali metal carbonates and bicarbonates.
  • sodium or potassium hydroxides or carbonates are employed to neutralize the monomer.
  • care must be taken to ensure that the pH of the resulting crosslinked absorbent polymer, which will be contacted with or dispersed in an aqueous fluid to be absorbed, is maintained in a range appropriate for the applications for which the polymer is intended Alternatively, the polymerization may be carried out employing unneutrahzed monomers and thereafter neutralizing, as is known in the art
  • hydrogen peroxide (0-500 ppm based on acrylic acid) can be 5 added as a bleaching agent either before or after the addition of the neutralizing agent
  • a free radical polymerization initiator is used in the polymerization of the water-soluble monomers and the crosslinking agent
  • a free radical polymerization initiator which is sufficiently soluble in the monomer solution to initiate polymerization is preferred
  • water soluble persulfates such as potassium 0 persulfate.
  • ammonium persulfate, sodium persulfate, and other alkali-metal persulfates, hydrogen peroxide and water soluble azo-compounds such as 2,2'-azob ⁇ s-(2- amidinopropane) hydrochlo ⁇ de may be used
  • the total amount ot initiators used mav range from 0 01 to 1 0 5 weight percent, preferably 0 01 to 0 5 weight percent, based on the total weight of ⁇ , ⁇ - ethylenically unsaturated monomer reactants
  • the water-absorbent resin will preferably be lightly covalently crosslinked to render it water-insoluble and water-swellable
  • the desired crosslinked structure may be obtained by crosslinking the polymer using at least two covalent crosslinking agents that o operate by different mechanisms
  • the first crosslinking agent suitably is a polyethylenically unsaturated crosslinking agent, which is also referred to herein as a polyvinyl crosslinking agent It is possible to employ two or more different polyvinyl crosslinking agents as the first crosslinking agent of the invention
  • crosslinking agents will typically be soluble in the aqueous 5 solution of the ⁇ , ⁇ -ethylen ⁇ cally unsaturated monomer, the crosslinking agents may be merely dispersible in such a solution without negative implications
  • Suitable dispersing agents include carboxymethyl cellulose suspending aids, methyl cellulose, hydroxypropyl cellulose, and polyvinyl alcohol o
  • Such dispersing agents are typically provided at a concentration between 0005 and 0 1 weight percent, based on the total weight of . ⁇ -ethylemcally unsaturated monomer reactants
  • an aqueous solution of the ⁇ , ⁇ -ethylen ⁇ cally unsaturated monomer in the partially 5 neutralized form, the covalent crosslinking agents, the initiator and a grafting polymer substrate, if desired, is prepared.
  • the polymerization of the mixture may be initiated by elevating the temperature of the mixture containing the initiator or by using a redox-type initiator as described above. Generally, the temperature at which polymerization will begin ranges from 5°C to 45°C. The temperature at which the polymerization is carried out is highly dependent on the type of monomers used and the specific initiator system employed. Preferably, the maximum temperature of polymerization ranges from 50°C to 100°C, most preferably from 60°C to 100°C.
  • the polymer of the invention is prepared in the substantial absence of high temperature oxidizing agents, such as bromine and chlorine oxidizing agents including, for example, sodium chlorate.
  • the process of the invention preferably is a bulk. gel. or solution, polymerization process.
  • the resultant polymer is typically pre-sized and dried using means well- known in the art.
  • suitable drying means include fluidized bed driers, rotary driers, heated screw conveyors, forced air ovens and through-circulation belt dryers.
  • Multi- stage drying in which drying occurs in two or more stages, optionally can be employed.
  • the composition of the invention exhibits a high gel bed permeability and low abso ⁇ tion capacity.
  • the composition has a gel bed permeability, as measured according to the method described below and expressed in square centimeters, of at least 5 x 10 "9 , preferably 20 x 10 9 . more preferably at least 30 x 10 "9 , even more preferably at least 50 x 10 "9 and most preferably at least 65 x 10 "9 .
  • the composition has an abso ⁇ tion capacity, as measured according to the method described below and expressed in g/g, of less than 26. more preferably less than 24. and most preferably less than 22.
  • Compositions having an abso ⁇ tion capacity of less than 20 g/g, and compositions having an abso ⁇ tion capacity of less than 18 g/g can also be prepared.
  • the polymer of the invention may be porous or nonporous.
  • carboxyl groups are present per 100 grams of the water-absorbent resin.
  • carboxyl-containing water absorbent polymers are hydrolyzates of starch-acrylonitrile graft copolymers. partially neutralized products of starch-acrylic acid or polyvinyl alcohol graft copolymers, saponification products of vinyl acetate acrylic ester copolymers, derivatives of copolymers of isobutylene and maleic anhydride, hydrolyzates of acrylonitrile copolymers.
  • crosslinked products of hydrolyzates of acrylonitrile copolymers crosslinked carboxymethyl cellulose, polyaspartate hydrolyzates of acrylamide copolymers, crosslinked products of hydrolyzates of acrylamide copolymers, partially neutralized products of polyacrylic acids and crosslinked products of 5 partially neutralized polyacrylic acids.
  • composition of the invention can optionally include other additives such as. for example, dedusting agents and anticaking agents, perfumes, and various salts.
  • Anticaking agents and dedusting agents are well-known.
  • the cationic surfactant anticaking agents of U.S. Patent 5,728,742 can also be employed.
  • Silica is an 0 example of a preferred anticaking agent.
  • Hydrophilic or hydrophobic dedusting agents, such as those described in U.S. Patents 6,090,875 and 5,994,440. may be added to control the level of dust.
  • Water soluble salts of aluminum such as aluminum sulfate. may also be employed in the process of the invention. If employed, from 0.25 to 4 weight parts of the aluminum salt preferably are employed per hundred weight parts of dried polymer.
  • Drying is preferably carried out at a temperature of at least 170°C, more preferably of at least 180°C. Drying is preferably carried out at a temperature of less than 250°C, more preferably less than 200°C.
  • the method of drying is not critical. If desired, the dried polymer may be remoisturized for ease in handling.
  • the polymer is further sized to form o particles preferably having an average diameter less than 2 mm and more preferably less than 1 mm.
  • the final polymer product has an average particle size of at least 160 microns.
  • the superabsorbent polymers of this invention are useful in the manufacture of moisture absorbent articles, such as disposable diapers, sanitary napkins, incontinence 5 garments and bandages.
  • the superabsorbent compositions of this invention are particularly useful in the manufacture of thin and ultra thin disposable diapers which have excellent moisture absorbence capacity, fluid distribution properties and reduced leakage. Construction of diapers and other absorbent articles is well known, and materials useful as fluff in absorbent articles are also well known. For the pu ⁇ oses of the present invention, o the term "fluff is given its meaning as understood by those of ordinary skill in the art.
  • fluff examples include cotton fibers, curly fibers, wood pulp fibers, synthetic fibers, or a combination thereof, which are formed into a pad and absorb primarily by capillary attraction mechanism. See, for example, WO 95/26209.
  • the 5 superabsorbent composition may be mixed with, attached to, layered in. or dispersed in a porous matrix of fibers.
  • matrices are made with hydrophilic fibers such as wood pulp or fluff, cotton linters, and synthetic fibers or a mixture of the fibers and the wood fluff.
  • the fibers can be loose or joined as in nonwovens.
  • synthetic fibers include those made using polyethylene, polypropylene, polyesters, and copolymers of polyesters and polyamides.
  • the synthetic fibers may be meltblown fibers or fibers which have been treated to render them hydrophilic.
  • Absorbent articles such as disposable diapers, typically are made with a liquid-impermeable backing material, a liquid-permeable bodyside facing material and the liquid-absorbing composite sandwiched between the backing material and the facing material.
  • the liquid-impermeable backing material can be made from commercially available polyolefin film and the liquid-permeable facing material can be made from a commercially available nonwoven material, such as spunbonded or corded fibrous web which is wettable and capable of passing urine.
  • the superabsorbent polymers of the invention can constitute from 5 percent to 95 percent by weight of the absorbent articles of the invention.
  • the superabsorbent polymer of the invention is dispersed in a fiber matrix: in such an article the superabsorbent advantageously is present in an amount from 30 to 70 weight percent based on the weight of the article and the fiber matrix is present in an amount of from 70 to 30 weight percent based on the weight of the article.
  • the superabsorbent may be present in a containment structure in which the superabsorbent polymer is present in an amount of 30 to 95 percent by weight. Combinations of dispersed superabsorbent polymer and contained superabsorbent polymer are also known.
  • Abso ⁇ tion capacity is measured according to the method stated in Buchholz, F.L. and Graham, A.T., “Modern Superabsorbent Polymer Technology,” John Wiley & Sons (1998), page 153.
  • Substantially homogeneous or uniform crosslinking of the polymer of the invention is determined by analysis of the dependence of the abso ⁇ tion capacity on particle size as described by Buchholz, F.L. and Graham, A.T., "Modern Superabsorbent Polymer Technology,” John Wiley & Sons (1998), pages 192 to 193.
  • Homogeneously crosslinked polymers show essentially no, or only slight, dependence of the abso ⁇ tion capacity on particle size while structured polymer particles, such as surface crosslinked polymers, show a decrease in abso ⁇ tion capacity with decreasing particle size for at least a part of the particle size range.
  • Hydrogen peroxide (200 ppm based on acrylic acid) was added before the addition of the carbonate solution.
  • the solution was transferred to an appropriate vessel equipped with an agitator capable of tearing the polymerization gel mass.
  • the agitator was started and 5.5 parts of a 10 percent aqueous solution of sodium persulfate was then added.
  • the mixture was sparged with nitrogen for 10-60 minutes at a rate sufficient to remove dissolved oxygen from the solution.
  • the mixture was warmed to 25 ⁇ °C and 0.5 parts of a 10 percent solution of sodium erythorbate was injected into the reaction mixture.
  • the mixture typically began to polymerize within 5 minutes.
  • the maximum temperature of the reaction mass was controlled between 80°C and 100°C, preferably between 80°C and 90°C, by pulling a vacuum on the reaction vessel. After the polymerization exotherm subsided, the vacuum was relieved with nitrogen and the reaction mass was agitated further at 60°C-70°C for 3 or more hours.
  • reaction gel mass was removed from the vessel and if necessary was further sized by extrusion through a die of the appropriate size. If employed, the second crosslinking agent was added to the gel by agitating the gel in an appropriate blender while adding the second covalent crosslinking agent.
  • the gel was dried by passing heated air (165-185°C) through the gel bed for 20-40 minutes. Control of the drying time and temperature was necessary to obtain the desired gel bed permeability. After drying, the moisture content of the gel was typically 1-3 wt. percent when determined gravimetrically after heating the dried polymer in an oven at 105°C for three hours.
  • a sample of gel was made using Procedure A with a SARTOMER #9035 level of 8.300 ppm BOA and was collected prior to drying. The gel was then treated with 10.200 ppm of glycerol (BOA) and the glycerol was allowed to diffuse into the hydrogel such that it was substantially uniformly distributed. The gel was dried at 170°C for a total of 36 minutes.
  • BOA glycerol
  • a sample of gel was made using Procedure A with a SARTOMER #9035 level of 8,300 ppm BOA.
  • the hydrogel was then treated with 18,000 ppm of glycerol (BOA) and the glycerol was allowed to diffuse into the hydrogel such that it was substantially uniformly distributed.
  • the gel was dried for a total of 30 minutes to a final temperature of approximately 180°C. The dried product was ground to the desired particle size.
  • a sample of gel was made using Procedure A with a SARTOMER #9035 level of 8,300 ppm BOA.
  • the hydrogel was then treated with 1.560 ppm of glycerol (BOA) and the glycerol was allowed to diffuse into the hydrogel such that it was substantially uniformly distributed.
  • the gel was dried for a total of 30 minutes to a final temperature of approximately 180°C.
  • the dried product was ground to the desired particle size. The ground product was further heat-treated at 205°C for 50 minutes.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hematology (AREA)
  • Dispersion Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

L'invention concerne un procédé amélioré destiné à la préparation de polymères superabsorbants présentant une haute perméabilité de lit de gel et une faible capacité d'absorption, ainsi que des polymères préparés selon ce procédé. Plus particulièrement, ce procédé est destiné à la préparation de particules polymériques insolubles dans l'eau et gonflant dans l'eau, ces particules présentant une haute perméabilité de lit de gel et une faible capacité d'absorption. Ledit procédé consiste à réticuler le polymère au moyen d'au moins deux agents de réticulation covalents dans des conditions permettant la formation d'un polymère réticulé de manière sensiblement uniforme présentant une perméabilité de lit de gel d'au moins 5 x 10-9 cm2 et une capacité d'absorption inférieure à 26 g/g. La présente invention concerne également des articles contenant ce polymère à haute perméabilité et à faible capacité d'absorption.
PCT/US2000/035082 1999-12-23 2000-12-21 Polymeres a faible capacite d'absorption et a haute permeabilite WO2001045758A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2001546697A JP2003518150A (ja) 1999-12-23 2000-12-21 高透過性で低吸収容量のポリマー
EP00989437A EP1244474A1 (fr) 1999-12-23 2000-12-21 Polymeres a faible capacite d'absorption et a haute permeabilite
KR1020027008058A KR20020064953A (ko) 1999-12-23 2000-12-21 투과도가 크고 흡수력이 작은 중합체

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US17301699P 1999-12-23 1999-12-23
US60/173,016 1999-12-23

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WO2001045758A1 true WO2001045758A1 (fr) 2001-06-28

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KR (1) KR20020064953A (fr)
CN (1) CN1411381A (fr)
WO (1) WO2001045758A1 (fr)

Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003104302A1 (fr) * 2002-06-01 2003-12-18 Basf Aktiengesellschaft Esters (meth)acryliques de trimethylolpropane polyalcoxyle
EP1659144A1 (fr) * 2003-08-29 2006-05-24 San-Dia Polymers, Ltd. Particule de resine absorbante, absorbant contenant cette particule, et article absorbant
WO2006083584A2 (fr) * 2005-02-04 2006-08-10 The Procter & Gamble Company Structure absorbante comprenant une matiere amelioree absorbant l'eau
US7157141B2 (en) 2000-03-31 2007-01-02 Stockhausen Gmbh Pulverulent polymers crosslinked on the surface
US7169843B2 (en) 2003-04-25 2007-01-30 Stockhausen, Inc. Superabsorbent polymer with high permeability
US7199211B2 (en) 2002-06-11 2007-04-03 Basf Aktiengesellschaft (Meth)acrylic esters of polyalkoxylated trimethylolpropane
WO2008037676A1 (fr) 2006-09-25 2008-04-03 Basf Se Procédé pour la préparation en continu de particules polymères absorbant l'eau
WO2008055935A2 (fr) * 2006-11-10 2008-05-15 Basf Se Superabsorbants présentant des propriétés supérieures de perméabilité et de transport
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EP2263704A1 (fr) 2004-10-20 2010-12-22 Basf Se Fines particules polymères absorbant l'eau, à forte capacité de transport et d'absorption de liquide
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US9309375B2 (en) 2005-09-30 2016-04-12 Nippon Shokubai Co., Ltd. Water-absorbing agent having water-absorbent resin as a main component and production method of the water-absorbing agent
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