WO2007116554A1 - 吸水性樹脂粒子凝集体及びその製造方法 - Google Patents
吸水性樹脂粒子凝集体及びその製造方法 Download PDFInfo
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- WO2007116554A1 WO2007116554A1 PCT/JP2006/321860 JP2006321860W WO2007116554A1 WO 2007116554 A1 WO2007116554 A1 WO 2007116554A1 JP 2006321860 W JP2006321860 W JP 2006321860W WO 2007116554 A1 WO2007116554 A1 WO 2007116554A1
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- absorbent resin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/18—Suspension polymerisation
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- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/04—Acids, Metal salts or ammonium salts thereof
- C08F20/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/14—Treatment of polymer emulsions
- C08F6/18—Increasing the size of the dispersed particles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/14—Treatment of polymer emulsions
- C08F6/22—Coagulation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/36—Amides or imides
- C08F222/38—Amides
- C08F222/385—Monomers containing two or more (meth)acrylamide groups, e.g. N,N'-methylenebisacrylamide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- the present invention relates to a water-absorbent resin particle aggregate suitably used for absorbent materials in various uses, including sanitary materials such as paper omgu, sanitary napkins, and incontinence pads, and a method for producing the same. It is.
- Examples of such a water-absorbent resin include a polyacrylic acid partially neutralized product bridge (see, for example, Patent Document 1), a hydrolyzate of starch acrylonitrile graft polymer (see, for example, Patent Document 2), starch acrylic acid graft weight Neutralized product of polymer (for example, see Patent Document 3), acid ester of vinyl acetate-acrylic acid ester copolymer (for example, refer to Patent Document 4), hydrolyzate of acrylonitrile copolymer or acrylamide copolymer ( Many are known, for example, see Patent Document 5).
- Patent Document 1 a polyacrylic acid partially neutralized product bridge
- Patent Document 2 a hydrolyzate of starch acrylonitrile graft polymer
- Patent Document 3 starch acrylic acid graft weight Neutralized product of polymer
- acid ester of vinyl acetate-acrylic acid ester copolymer for example, refer to Patent Document 4
- the water absorption property is improved by increasing the internal carboxyl group neutralization rate to a specific value or more and the external surface carboxyl group neutralization rate to a specific value or less to improve the absorption performance under pressure.
- Fat particles are known (for example, Patent Document 6).
- the water-absorbent resin particles disclosed in Patent Document 6 also have a sufficient water holding capacity with a water absorption capacity of about 60 gZg under no pressure.
- a reverse phase suspension polymerization method using a special surfactant for example, Patent Documents 7, 8, and 9.
- the production of water-absorbent rosin particles with a large particle size is also being studied.
- the particle size of the particles obtained by these methods is about several hundreds / zm, and the surfactant used is not a readily available surfactant, and the stability of emulsion in polymerization. Are unstable and the absorption capacity is low.
- Patent Document 15 uses a two-stage polymerization method to increase the size of particles by particle aggregation, and is a manufacturing process in which polymerization is performed in two stages, so that the production efficiency is higher than that in a single stage. Get worse.
- Patent Document 1 Japanese Patent Laid-Open No. 55-84304
- Patent Document 3 Japanese Patent Laid-Open No. 51-125468
- Patent Document 4 Japanese Patent Laid-Open No. 52-14689
- Patent Document 5 Japanese Patent Publication No. 53-15959
- Patent Document 6 Japanese Unexamined Patent Publication No. 2005-200630
- Patent Document 9 Japanese Patent Publication No. 63-36322
- Patent Document 10 Japanese Patent Publication No. 63-36321
- Patent Document 11 Japanese Patent Laid-Open No. 62-132936
- Patent Document 12 Japanese Patent Publication No. 3-26204
- Patent Document 13 US Pat. No. 6,586,534
- Patent Document 14 US Pat. No. 6,174,946
- Patent Document 15 JP-A-9 77810
- An object of the present invention is to provide a simple method for producing water-absorbent resin particles that can produce water-absorbent resin particles having a large particle size with sufficiently high water retention without using a special material. is there.
- a further object of the present invention is to provide a water-absorbent rosin particle aggregate exhibiting stable and high water retention.
- the inventors of the present invention in the water-absorbent resin particle aggregate, when the neutralization rate of the outer surface and the internal force lpoxyl group is a specific value, stably high water retention without causing gel blocking. It was found to show sex.
- a method for producing a water-absorbent coagulant particle aggregate comprising the following steps (1) and (2):
- the outer surface of the water-absorbent resin particle aggregate contains a portion having a carboxyl group neutralization rate power of 0 mol% or less, and the water-absorbent resin particle aggregate has a carboxyl group neutralization rate of 50%. The part which is more than mol% is included.
- part of the primary particles are peeled off from the secondary particles during the water absorption, and a high surface area can be achieved during the water absorption, resulting in a higher absorption rate than when primary particles are made larger. Presumed to be possible.
- the water-absorbing resin constituting the aggregate is modified by a water-soluble solvent, preferably an alcohol, used when the primary particles are aggregated, which is also a factor for improving water retention.
- a water-soluble solvent preferably an alcohol
- the hydrophilic group and hydrophobic group of the polymer chain of the water-absorbent resin are also a factor for improving water retention.
- the aggregated secondary particles particularly when the proportion of large particles having a large particle size used in a water-absorbing composite such as a body fluid absorbent article is high, the particles adhere to each other at the time of water absorption.
- a gel blocking phenomenon called a phenomenon may occur.
- gel blocking occurs, the insertion of water between the particles is suppressed, and the aggregate cannot fully exhibit its water absorption capability and cannot achieve high water retention.
- the cause of this gel blocking is presumed to be that the outer surface of the particles swells during water absorption and becomes easy to adhere.
- the invention's effect [0023] According to the first invention of the present application, it is possible to provide a water-absorbent resin material having high water retention (water absorption ratio), high and absorption speed.
- the water-absorbent resin particle aggregate can stably achieve high water retention (water absorption capacity) even when the proportion of large particles is high.
- the production method of the first invention of the present application can be broadly divided into a polymerization process, an aggregation process, a fusion process, a recovery process, a drying process, and a heating process.
- a polymerization process an aggregation process, a fusion process, a recovery process, a drying process, and a heating process.
- the unsaturated carboxylate is obtained by neutralizing an unsaturated carboxylic acid with an alkali metal or ammonia or amines.
- Unsaturated carboxylates may be used alone or in admixture of two or more.
- the unsaturated carboxylate includes an ammonium salt, a sodium salt, and a lithium salt from the viewpoint of increasing the absorption capacity of the produced water-absorbing resin.
- ammonia salts and sodium salts are preferred, and both the effects on the human body and the absorption capacity are preferred.
- the unsaturated carboxylic acid refers to a compound having both an unsaturated bond and a carboxylic acid group, and may contain many unsaturated bonds and carboxylic acid groups.
- An unsaturated bond is one containing a double bond (ethylene bond) or a triple bond (acetylene bond) between carbon atoms.
- Typical examples of such unsaturated carboxylic acids that produce ammonia salts include (meth) acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, and kaycin acid. Take as an example.
- acrylic acid and methacrylic acid are preferred because of their polymerizability and polymer absorbency.
- the unsaturated carboxylate salt in the first invention of the present application is preferred! /
- the example unsaturated carboxylate ammonium may be produced by any method.
- a. A method in which unsaturated nitrile and Z or unsaturated amide are subjected to a hydrolysis reaction by a microorganism, and b.
- Unsaturated nitrile subjected to hydrolysis by microorganisms is a compound containing both an unsaturated bond and a cyan group in the molecule. It may contain many unsaturated bonds and cyan groups.
- An unsaturated bond is one containing a double bond (ethylene bond) or a triple bond (acetylene bond) between carbon atoms. Examples of such compounds include acrylo-tolyl, metatary mouth-tolyl, croton-tolyl, and cinnamate-tolyl. Of these, acrylonitrile and acrylonitrile, which are preferred for methacrylic acid-tolyl, are more preferred.
- Unsaturated amides used for hydrolysis by microorganisms are unsaturated bonds in the molecule and those represented by the general formula RCONH— (where R is an alkyl group).
- RCONH— where R is an alkyl group.
- acrylamide and methacrylamide are preferred, and acrylamide is particularly preferred, including cinnamate amide, acrylamide and methacrylamide.
- microorganisms there are no particular restrictions on the hydrolysis conditions of unsaturated-tolyl and Z or unsaturated amide by microorganisms, but as the microorganisms, an aqueous solution of unsaturated carboxylic acid ammonium having a concentration of 20% by weight or more is used. Microorganisms that can be produced are preferred. As such microorganisms, It is preferable to use at least one species selected from the group genus consisting of the genus Tura, Alkaligenes, Corynebacterium, Rhodococcus, and Gordona. Among the microorganisms mentioned above, the following strains deposited by Asahi Kasei Chemicals Co., Ltd. (1-2-2 Yurakucho, Chiyoda-ku, Tokyo, Japan) are preferred among the microorganisms belonging to the genus Acinetopacter.
- Table 1 shows the microbiological properties of Acinetopacter sp. AK226 strain (FERM BP-08590) and Acinetobutter sp. AK227 strain (FERM BP-08591).
- the unsaturated carboxylic acid ammonium aqueous solution produced by the hydrolysis method using this microorganism has a very small amount of impurities such as dimers of unsaturated carboxylic acid and Z or hydrate.
- the production method is the preferred method
- the same unsaturated carboxylic acid as described above is used as the unsaturated carboxylic acid as described above.
- This unsaturated carboxylic acid can be made by any method.
- an unsaturated carboxylic acid contains a large amount of impurities, it is preferable to purify and reduce the impurities.
- the impurity here refers to a compound that can be decomposed into a monomer component.
- acrylic acid such as hydrated unsaturated bonds and oligomers
- j8-hydroxypropionic acid and j8-atallyloyloxypropionic acid can be mentioned.
- the purification method is not particularly limited by any method. As a method, for example, distillation may be performed.
- the amount of impurities is preferably reduced to lOOOOppm or less, more preferably 500ppm or less, further preferably 300ppm or less, and most preferably lOOppm or less. If there are many impurities, there will be a large amount of residual monomers in the resulting water-absorbent resin, and if the residual monomers increase in the subsequent production process! /, The phenomenon will occur, and the physical properties of the polymer may be insufficient. There is preferable.
- the neutralization method is not particularly limited. Ammonia water or ammonia gas may be used. Neutralization may be performed under the condition that the neutralization ratio of acrylic acid exceeds 100 mol% at least for a period of time during the neutralization step. In the neutralization step, the temperature is preferably maintained at 0 to 50 ° C by cooling. If the temperature rises too much, ⁇ -hydroxypropionic acid oligomers are produced, which is preferable! /.
- the amount of the unsaturated carboxylic acid alkali metal salt used in the monomer aqueous solution is the total molar amount of the unsaturated carboxylic acid and its salt (this is the amount of unsaturated carboxylic acid ammonium and unsaturated carboxylic acid). The sum of the molar amounts of the alkali metal salt and the unsaturated carboxylic acid. )
- the content of the unsaturated carboxylic acid alkali metal salt is low, and it is more preferable that it is in the range of 0 to 20 mol%. preferable. More preferably, it is 0 to 10%.
- the amount of unsaturated carboxylic acid ammonium in the monomer aqueous solution is the total molar amount of unsaturated carboxylic acid and its salt (this is the amount of unsaturated carboxylic acid ammonium and unsaturated carboxylic acid).
- the total molar amount of each of the alkali metal salt and the unsaturated carboxylic acid) is from 60 to: LOO mol%, from the viewpoint of the absorption capacity of the water-absorbent resin produced. preferable.
- the content of unsaturated carboxylic acid ammonium is high.
- the range of 80 to LOO mol% is preferred. preferable. More preferably, it is 95 to 100%.
- the monomer aqueous solution may contain an unsaturated carboxylic acid.
- the amount of unsaturated carboxylic acid used is the total molar amount of monomer (this is the amount of unsaturated carboxylic acid ammonium, unsaturated carboxylic acid alkali metal salt, unsaturated carboxylic acid and other monomers, respectively). Is preferably in the range of 0 to 45 mol%. In order to improve the absorption capacity of the produced water-absorbing resin, it is more preferable that the content of unsaturated carboxylic acid is lower in the range of 0 to 20 mol%. More preferably, it is 0 to 10%.
- Hydrophilic monofunctional unsaturated monomers and their salts containing acid groups such as Roylethanesulfonic acid, 2- (meth) attalyloylpropansulfonic acid, etc .
- Hydrophilic monofunctional unsaturated monomers containing amide groups such as N-n-propyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, etc .
- (meth) acrylic acid (salt), 2- (meth) ataryloylethanesulfonic acid (salt), 2- (meth) acrylamide 2-methylpropanesulfonic acid (salt), methoxypolyethylene glycol (Meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and (meth) acrylamide are preferred.
- the content of the monomers other than these unsaturated carboxylic acids and salts thereof is the total molar amount of monomers (this is unsaturated ammonium carboxylate, unsaturated carboxylic acid alkali metal salt, unsaturated rubone
- the total molar amount of each of the acid and other monomers is preferably 0 to 45 mol%. Since these are used for the modification of water-absorbing oils according to various purposes, the optimum use amount is different for each purpose. It is preferably in the range of 0 to 20 mol%, more preferably in the range of 0 to 5 mol%.
- a crosslinked structure can also be introduced into the water-absorbent resin using a radical polymerizable crosslinking agent upon polymerization.
- Radical polymerizable crosslinkers include polymerizable unsaturated groups and
- a compound having multiple Z or reactive groups in one molecule If it is a compound having multiple Z or reactive groups in one molecule. It is preferable to use a compound having a high hydrophilicity as a radical polymerizable crosslinking agent because it improves the water absorption performance of the resin.
- a radical polymerizable crosslinking agent When the monomer is a self-crosslinking type compound, an internal cross-linked structure can be formed without using a radical polymerizable cross-linking agent.
- a compound containing two or more functional groups capable of reacting with a carboxyl group can be added.
- radical polymerizable crosslinking agent examples include N, N-methylenebis (meth) acrylamide, (Poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, trimethylol propane tri (meth) acrylate, trimethylol propane di (meth) acrylate, glycerin (meth) acrylate , Glyceryl attalate metatalylate, ethylenide-modified trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, triallyl cyanurate, triallyl Compounds having a plurality of unsaturated bonds in one molecule typified by isocyanurate, triallyl phosphate, triallylamine, poly (meth) alkyloxyalkane, etc .;
- radical polymerizable crosslinking agents may be used alone or in combination of two or more.
- Compounds containing two or more functional groups capable of reacting with carboxyl groups include ethylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether, (poly) glycerin polyglycidyl ether, diglycerin.
- Glycidyl ether compounds such as polyglycidyl ether and propylene glycol diglycidyl ether; (poly) glycerin, (poly) ethylene glycol, (poly) propylene glycol, 1, 3 propanediol, polyoxyethylene glycol, triethylene glycol, Tetraethylene glycol, 1, 6 hexanediol, trimethylolpropane, diethylanolamine, triethanolamine, polyoxypropylene, oxyethyleneoxypropylene block copolymerization , Pentaerythritol, sorbitol, and other polyvalent alcohols; polyvalent amines such as ethylenediamine, diethylenediamine, polyethyleneimine, hexamethylenediamine; 2, 2 bishydroxymethylbutanol monotris (3 — Multivalent aziridin compounds such as (1- ⁇ -glycidyl) propionate); 1,3 Dixolan-2-one, 4-Methyl-1,3 Dioxo
- carboxylic acid reactive crosslinking agents it is preferable to use one or more selected from the group consisting of polyhydric alcohols, polyhydric glycidyl compounds, polyhydric amines, and alkylene carbonates. .
- the content of the carboxylic acid-reactive crosslinking agent in the raw material solution for polymerization is monomer (unsaturated carboxylic acid ammonium, unsaturated carboxylic acid alkali metal salt, unsaturated carboxylic acid and other carboxylic acid). It is preferable that the amount be in the range of 0 to 20 mol% with respect to the total molar amount of the monomer) and the radical polymerizable crosslinking agent. As shown in Flory's water absorption theory, the lower the crosslinking density, the higher the water absorption ratio, so that a small amount is preferable.
- the range of 0 to 20 mol% is more preferable, and the range of 0 to 5 mol% is more preferable, and the range of 0 to 0.09 mol% is more preferable. If the amount of the carboxylic acid-reactive crosslinking agent is too large, a hard gel is formed and the absorption capacity is remarkably lowered.
- the gel hardness can be adjusted by a combination of a radical polymerizable crosslinking agent and the carboxylic acid reactive crosslinking agent.
- the radical polymerizable cross-linking agent is added to the total molar amount of the monomer (unsaturated carboxylic acid ammonium, unsaturated carboxylic acid alkali metal salt, unsaturated carboxylic acid and other monomers) and the radical polymerizable cross-linking agent.
- the monomer unsaturated carboxylic acid ammonium, unsaturated carboxylic acid alkali metal salt, unsaturated carboxylic acid and other monomers
- the radical polymerizable cross-linking agent is added to the total molar amount of the monomer (unsaturated carboxylic acid ammonium, unsaturated carboxylic acid alkali metal salt, unsaturated carboxylic acid and other monomers) and the radical polymerizable cross-linking agent.
- the carboxylic acid reactive crosslinking agent in a range of 0 to 5 mol% with respect to the total molar amount. is in the range of 0 to 3 mol 0/0.
- a foaming agent In addition to the monomer and the internal crosslinking agent, if necessary, a foaming agent, a chain transfer agent, a chelating agent, etc. may be added for polymerization.
- the monomer concentration in the aqueous monomer solution at the start of polymerization is preferably 40% by weight or more and less than the solubility of the monomer in water.
- a concentration of 45 to 80% by weight is preferred, more preferably 50 to 70% by weight.
- the monomer concentration is 40% by weight or more, it will not affect water retention substantially.
- an amount of the internal cross-linking agent By using an amount of the internal cross-linking agent, a water-insoluble water-absorbing resin can be produced.
- the higher the monomer concentration the easier the filtration and separation between the hydrogel and the solvent produced, and this is preferable because a simple process can be employed.
- gels with high water content are highly sticky, and when gels are separated by filtration, the gel is fixed and integrated, but in this case, the solvent is evaporated and the water content is reduced by azeotropic dehydration at the same time. A method of collecting the gel after the reduction can also be adopted.
- a nonionic surfactant is allowed to coexist in an organic solvent.
- the nonionic surfactant may be added in advance to the organic solvent or may be added as needed during the polymerization process.
- nonionic surfactant those having HLB of 4 to 12 are preferable.
- a nonionic surfactant having HLB in this value is present, the polymerization reaction solution forms a stable emulsion, and the stability of production of large particles increases.
- a surfactant having an HLB of 5 to 10 is preferred.
- nonionic surfactant having 4 to 12 HLB examples include sorbitol fatty acid ester, sorbitol fatty acid ester, sorbitan fatty acid ester, and sorbitan fatty acid ester.
- sorbitan fatty acid ester type and sorbitan fatty acid ester ether type are preferable.
- Sarabiko, HLB force S 5-10 sorbitan monostearate, sorbitan monolaurate oxychetylene sorbitan monostearate ether is preferred. More preferred is sorbitan monostearate.
- the HLB value is Griffin's HLB described in “Introduction to New Surfactants” published by Sanyo Chemical Industries, Ltd.
- the formula for calculating the HLB value is defined as follows.
- Nonionic surfactant HLB (molecular weight of hydrophilic group / molecular weight of surfactant) X 20
- the surfactant is used in an appropriate range of 0.1 to 15% by weight based on the monomer. It is preferably 0.25% by weight. Even if the amount used is too small, a stable emulsion state cannot be maintained, and even if it is used in an amount of 15% by weight or more, the resulting good results cannot be obtained.
- the organic solvent used in the first invention of the present application is an organic solvent that is mixed with an equal amount of water and then separated into two layers as a stationary state and does not significantly inhibit the radical polymerization reaction of the raw material monomer. There is no need to limit the type and amount of functional groups and constituent atoms.
- a solvent that is difficult to chemically react with a surfactant that has good separability from water with low latent heat of vaporization is preferably used.
- a hydrocarbon solvent is preferable. More preferred is an aliphatic hydrocarbon solvent.
- a saturated aliphatic hydrocarbon solvent is more preferable.
- the saturated aliphatic hydrocarbon solvent may have a linear structure, a branched structure, or a cyclic structure.
- a compound having a plurality of structures of a linear structure, a branched structure, and a cyclic structure in one molecule may be used.
- saturated aliphatic hydrocarbon solvent examples include saturated aliphatic hydrocarbon solvents having a cyclic structure such as cyclopentane, cyclohexane, methylcyclopentane, methylcyclohexane, and cyclooctane; n-pentane, Examples thereof include saturated aliphatic hydrocarbons having a chain structure such as n-hexane, n-heptane, n-octane, and rigin.
- cyclopentane cyclohexane
- shikaku kutan n-pentane
- n-xane n-xane
- cyclohexane is more preferred because of the stability of the obtained emulsion and various physical properties such as the boiling point and specific gravity of the solvent. is there.
- initiators used for radical polymerization include persulfates such as potassium persulfate, ammonium persulfate, and sodium persulfate; peroxyhydrogen; tamenoid-peroxide, t-butyloxide.
- initiators such as id-peroxide and organic peroxides such as peracetic acid.
- the inside of the polymerization reactor may be any of reduced pressure, normal pressure, and increased pressure.
- the polymerization initiation temperature is usually 0 to: LOO ° C in many cases, but is not particularly limited.
- the polymerization initiation temperature is preferably 10 to 50 ° C.
- the temperature during the polymerization is usually the same as the starting temperature and is 0-100 ° C, preferably 40-80 ° C.
- the temperature in the reactor during the polymerization reaction may be left to the control, and the temperature may be controlled by cooling or heating from the outside.
- the reaction temperature may be controlled by the boiling point of the solvent. When controlling the reaction temperature depending on the boiling point of the solvent, it is preferable to adjust the boiling point by adjusting the pressure of the gas phase. It is a preferable method to control the polymerization by changing the reaction temperature from the start to the end of the polymerization. For example, it is a very preferable method to suppress the runaway reaction at a relatively low temperature at the beginning of the reaction, to increase the degree of polymerization and to reduce the residual monomer at the end of the reaction.
- the type and amount of surfactant in the polymerization step, the ratio of the monomer aqueous solution phase to the organic solvent phase, and the magnitude of the stirring power greatly affect the primary particle size of the aggregated particles to be produced.
- the primary particles are aggregated with a water-soluble solvent.
- the water-soluble solvent means an organic solvent having a solubility in water of 1% by weight or more.
- the water-soluble solvent to be added may be one type or a plurality of types, but preferably two or more types of water-soluble solvents are used. More preferably, two or more water-soluble solvents containing a polyvalent alcohol are used. Use of a polyhydric alcohol containing two or more alcohol groups as a water-soluble solvent is preferable because it has a high effect of reducing the water-soluble component produced in the aggregation step. When using multiple types of water-soluble solvents, the timing may be added simultaneously! /, Or they may be added independently.
- the temperature at the time of adding the water-soluble solvent is not particularly limited as long as the emulsion is maintained. It may be carried out as it is at the polymerization temperature or may be added after heating. Alternatively, it may be cooled to near room temperature. Preferably 25-120 ° C, more preferably 50-: L 10. C, more preferably 65 ° C to 100 ° C.
- the conditions for including the step of reducing the water content of the particle aggregate gel by azeotropic dehydration with a solvent after the aggregation step are not particularly limited to pressure and temperature.
- the particle size of the aggregated secondary particles can be controlled by the amount of the water-soluble solvent to be added and the magnitude of the stirring power, and an arbitrary particle size can be obtained.
- the secondary particle size is not particularly limited.
- the generation of dust is a problem for small particle sizes.
- those not used and those with extremely large particle sizes are not used because of their slow water absorption rate.
- 100-5000 ⁇ m force is preferable, 300 ⁇ m-3000 ⁇ m particle size force is particularly preferable!
- the glass transition temperature of the gel varies depending on the moisture content and neutralization rate of the gel.
- the heating temperature is preferably 40-200 ° C, more preferably 60-180 ° C. Preferably, it is 60 to 150 ° C.
- the heating time is preferably 1 to 120 minutes. There is no particular limitation as long as the gel can be sufficiently fused in both temperature and time and the product performance is not deteriorated. It is also effective to apply pressure to increase the heating temperature, which is different from the polymerization time.
- a solvent may be used.
- the bond strength of the aggregated particles is not particularly limited, but it is preferable that the strength is high considering that the produced resin is to be nominated. It is preferably 1N or more.
- the produced hydrous gel is recovered. Separation of the solvent and hydrous gel includes filtration fractionation, fractionation by centrifugation, removal of the solvent by heating, etc. Any method may be used.
- the water-absorbent resin When an ammonium salt is used as the water-absorbent resin, the water-absorbent resin can be heat-treated after drying as described above to liberate ammonia, and the ammonia neutralization rate can be controlled to an arbitrary ratio. Since the release of ammonia also causes the surface force of the resin, the neutralization rate of the water-absorbent resin on the outer surface of the water-absorbent resin particle aggregate can be reduced. Therefore, such a heating process can be used for the production of the water-absorbent resin particle aggregate of the second invention of the present application.
- water-soluble solvents such as polyhydric alcohol added in the coagulation process are reacted with functional groups in the low-molecular weight polymer that becomes water-soluble, reducing the high molecular weight of the low-molecular weight polymer and reducing water-soluble It is also possible to make it.
- This heating step may be carried out by allowing the water-absorbent resin after drying to coexist with the nonwoven fabric or pulp in the state of contact, adhesion, adhesion, etc., or may be performed alone.
- the heating temperature is preferably in the range of 130 to 250 ° C, more preferably 150 to 200 ° C.
- the heating temperature is dry in terms of the distribution structure of the neutralization rate in the resin body and the water absorption performance. It is preferable that the temperature is 10 to 150 ° C higher than the drying temperature, and it is more preferable that the temperature is 30 to 100 ° C.
- the heating time is preferably 0.5 minutes to 5 hours, more preferably 2 to 60 minutes, and even more preferably 3 to 15 minutes.
- the atmosphere of the heat treatment is not particularly limited, but it is preferable to perform in a nitrogen atmosphere.
- the present invention can also carry out a so-called surface cross-linking treatment by impregnating a dried water-absorbent resin with a compound containing two or more functional groups capable of reacting with a carboxyl group and causing a cross-linking reaction by heating. Is within the range.
- the water-absorbent resin particle aggregate of the second invention of the present application is a secondary particle in which primary particles are aggregated.
- the primary particles in the second invention of the present application include 50% by mole or more of the repeating units in the polymer molecular chain, and at least a part of the carboxyl groups of the carboxyl group-containing unit is an alkali. It consists of a water-absorbing resin that has been neutralized with at least one base that is also selected from metals, amines and ammonia power.
- any known method can be used without limitation as long as it can produce the water-absorbent resin particle aggregate of the second invention of the present application.
- the production method can be suitably used.
- the shape of the primary particles is spherical and indeterminate.
- the particle diameter of the target secondary particle may be any particle diameter that can be obtained after aggregation, but the average particle diameter is preferably 30 to L000 m. Considering the water absorption rate of the secondary particles, it is preferable to use primary particles having a relatively small particle size. It is more preferable that the average particle size is 30 to 500 / ⁇ ⁇ . The radial force is ⁇ 30 to 300 / ⁇ ⁇ .
- the average particle diameter is a value determined by the following method. Particle opening force 20 m, 40 m, 75 ⁇ m, 106 m, 212 m, 300 ⁇ m, 425 ⁇ m, 500 ⁇ m, 600 m, 710 m, 850 ⁇ m, 1000 m, 1180 m, 1400 ⁇ m, 1700 / zm, 2000 ⁇ m, 4000 ⁇ m, 5600 ⁇ m
- the intermediate value of the opening is the classification particle size of the particles.
- the classified particle size is 10 m, and for those remaining on a 5600 m sieve, the classified particle size is 6000 m.
- the classified particle weight value a value obtained by multiplying the value of each classified particle size by the weight ratio (%) with respect to the total particle weight of the particles belonging to the classified particle size (hereinafter abbreviated as the classified particle weight value) is calculated.
- the sum of the classified particle weight values of all classified particles is calculated, and the value obtained by dividing this value by 100 is taken as the average particle size of the particles.
- the water-absorbent resin constituting the primary particles 50 mol% or more of the repeating units in the polymer molecular chain are carboxyl group-containing units, and the point of water absorption performance is also preferably 80 mol of carboxyl group-containing units. % Or more, more preferably 90 mol% or more.
- carboxyl group-containing monomer derived from the carboxyl group-containing unit in the water-absorbing resin constituting the primary particles include acrylic acid, methacrylic acid, itaconic acid, maleic acid.
- examples thereof include acids, crotonic acid, fumaric acid, sorbic acid, cinnamic acid, anhydrides and neutralized salts thereof.
- the carboxyl group in the water-absorbent resin constituting the primary particles is partially neutralized, and the neutralized base is at least one of alkali metals such as sodium, potassium and lithium, amines, ammonia and the like. It is.
- the neutralizing base preferably contains ammonia
- the carboxyl group-neutralized salts in the water-absorbent coagulant constituting the primary particles is an hammo-um salt.
- 50 mol% or more of the carboxyl group-neutralized salts in the water-absorbent coagulant constituting the primary particles is an hammo-um salt.
- 70 mol% or more is an ammonia salt, and still more preferably 100 mol% is an ammonia salt.
- Specific examples of the monomer component other than the carboxyl group-containing monomer of the water-absorbent resin constituting the primary particles include mainly monofunctional unsaturated monomers. Contains acid groups such as sulfonic acid, styrene sulfonic acid, 2- (meth) acrylamide-2-methylpropansulfonic acid, 2- (meth) acryloylethane sulfonic acid, 2- (meth) acryloylpropansulfonic acid, etc.
- Hydrophilic monofunctional unsaturated monomers and their salts acrylamide, methacrylamide, N-ethyl (meth) acrylamide, N—n-propyl (meth) acrylamide, N—isopropyl (meth) acrylamide, N, N— Amide group-containing hydrophilic monofunctional unsaturated monomer represented by dimethyl (meth) talyl amide, etc .; 2-hydroxyethyl (meth) acrylate, 2 Esterified hydrophilic unsaturated monomers represented by hydroxypropyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, polyethylene glycol mono (meth) acrylate, etc .; butyl pyridine, N-butyl pyrrolide , N-Atarylloylbiperidine, N-Atarylloylpyrrolidine, N, N-Dimethylaminoethyl (meth) acrylate, N, N-Jety
- (meth) acrylic acid (salt), 2- (meth) ataryloylethanesulfonic acid (salt), 2- (meth) acrylamide 2-methylpropanesulfonic acid (salt), methoxypolyethylene glycol (Meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and (meth) acrylamide are preferred.
- the water-absorbing rosin constituting the primary particles further includes deodorants, antibacterial agents, fragrances, various inorganic powders, foaming agents, pigments, dyes, hydrophilic short fibers, fertilizers, oxidizing agents, reducing agents, Water, salts, and the like can be added to give various functions.
- the “water-absorbing resin” in the second invention of the present application includes a water-absorbing resin composition to which such additives are added.
- the water-absorbent resin particle aggregate of the second invention of the present application is a secondary particle in which the primary particles are aggregated.
- the method for aggregating the primary particles is not limited, but the method for producing an aggregate of the first invention of the present application can be suitably used.
- the water-absorbent resin particle aggregate of the second invention of the present application includes a portion of the water-absorbent resin having a carboxyl group neutralization rate S of 40 mol% or less on the outer surface, and the water-absorbent resin in the interior thereof. It includes a portion where the carboxyl group neutralization rate of fat is 50 mol% or more.
- carboxyl group neutralization rate refers to the molar fraction of all the carboxyl groups in the water-absorbent resin, and the molar fraction of the water-absorbent resin particle aggregate " The “outer surface” is the part that is exposed to the outside of the aggregate.
- the neutralization rate of the water-absorbing resin particles inside the water-absorbing resin particle aggregate is preferably 60 mol% or more, more preferably 70 mol% or more.
- the neutralization rate of coconut resin is preferably 35 mol% or less, more preferably 30 mol% or less.
- a so-called surface cross-linking treatment in which a compound containing two or more functional groups capable of reacting with a carboxyl group is impregnated into the dried water-absorbent resin particle aggregate and a cross-linking reaction is caused by heating. It is also possible to reduce the neutralization rate.
- the method of releasing the neutralized salt from the outer surface by heat treatment to reduce the neutralization rate is a simple method, and is a primary located inside the aggregate that is not just the outer surface of the aggregate. Since the neutralization rate of the outer surface of the particles can also be reduced, gel blocking between primary particles occurring inside the aggregate can be suppressed, which is preferable.
- the heating conditions are not limited, and the internal neutralization rate should be set in a timely manner so that the internal neutralization rate is 60 mol% or more and the outer surface neutralization rate is 40 mol% or less.
- such heat treatment may be performed in a state where the dried water-absorbent resin particle aggregate is in contact with, bonded to, or adhered to the nonwoven fabric or pulp.
- the collection may be performed alone.
- the heating temperature is preferably in the range of 100 to 250 ° C, more preferably 120 to 200 ° C. Further, from the viewpoint of the distribution structure of the neutralization rate in the resin body and the water absorption performance, the heating temperature is preferably 10 to 150 ° C. higher than the drying temperature at the time of forming the aggregate. More preferably, it is carried out at a high temperature.
- the heating time is preferably 0.5 minutes to 5 hours, more preferably 2 to 60 minutes, and even more preferably 3 to 15 minutes.
- the atmosphere for the heat treatment is not particularly limited, but it is preferable to perform the heat treatment in a nitrogen atmosphere.
- the carboxyl group neutralization rate of the water-absorbent rosin can be measured by a microscopic ATR method which is one of infrared absorption analysis methods.
- the neutralization rate of the outer surface of the aggregate can be determined by directly measuring the outer surface of the aggregate by the microscopic ATR method.
- the neutralization rate inside the aggregate can be determined, for example, by using an ultramicrotome (ULTRACUT N manufactured by Reichert) to cleave the aggregate to expose the interior and to measure by the force microscopic ATR method.
- the measuring device for example, FTS-575 manufactured by Bio-Rad, etc. can be used.
- the sample carboxyl group neutralization ratio is known, for example, 10 mol% of full power carboxylic acid, 30 mole 0 I 50 moles 0 I 70 moles 0 I 90 moles 0 I 100 mole 0/0 and neutralized with ammonia partial Crosslinked polyacrylic acid or the like can be measured as a standard sample, and a calibration curve created thereby can be used to determine the carboxyl group neutralization rate.
- a calibration curve created thereby can be used to determine the carboxyl group neutralization rate.
- water-absorbent resin particle aggregates are sometimes mixed with pulp and used as water-absorbing composites, which makes it easy to handle such as mixing with pulp.
- Spherical particles or irregular particles are preferable.
- the average particle size is preferably 100 ⁇ m to 5000 ⁇ m, more preferably 550 ⁇ m to 2100 ⁇ m, and most preferably 780 to 1550 ⁇ m.
- the particle size is extremely small, it becomes a fine powder and becomes a problem during use, such as being easily scattered.
- there are problems such as a decrease in water absorption speed and unevenness of the water-absorbent resin particle aggregates in the absorbent article.
- the bond strength of the water-absorbent coagulant particle aggregate is not particularly limited, but it is preferable that the strength is high considering the fact that the produced coagulant is to be sealed. It is preferable that it is 1N or more as measured by the Kiya type strength meter. More preferably, it is 5N.
- the bodily fluid absorbent article is a bodily fluid absorbent article composed of a liquid permeable sheet, a liquid impermeable sheet and a water absorbing absorbent force interposed therebetween, and all articles having the ability to absorb bodily fluids.
- Point to. urine, menstrual blood, breast milk, loose stool and the like are not limited to the absorbing body fluid.
- a pad shape, a tape type, or a pan shape is preferably used.
- Specific examples of the body fluid absorbent article include diapers, sanitary napkins, urine pads, and breast milk pads.
- the bodily fluid absorbent article of the present application includes the water-absorbent resin particle aggregate produced by the production method of the first invention of the present application and Z or the water-absorbent resin particle aggregate of the second invention of the present application. .
- the structure of the absorbent body is not limited, but for example, fibrous materials such as pulp and water-absorbent rosin granules Examples thereof include a mixture of child agglomerates and those obtained by fixing water-absorbent resin particle aggregates on a substrate.
- FTS-575 manufactured by Bio-Rad was used as a measuring apparatus.
- a microscopic ATR method (crystal plate Ge once reflection) was adopted, Back Ground: Air room temperature measurement, aperture: 50 X 50 m, integration number: 100 times.
- the cleaving was performed with an ultramicrotome (ULTRACUT N manufactured by Reichert).
- Measurements were performed in the same manner as the calibration curve sample.
- a sample having a particle size of 300 to 700 ⁇ m was used as a measurement sample.
- the outer surface of the water-absorbent resin particle aggregate was directly measured by the ATR method, and the inner surface was cleaved by the ultramicrotome and then measured by the ATR method. The outer surface was measured three times for each sample, and the lowest value was taken as the measurement result. In addition, the inside was measured 5 times per sample, and the highest value was taken as the measurement result. [0095] (Measurement of water retention capacity of water-absorbent rosin (primary particles and primary particle aggregates; Tea bag method)) Sample A (g) (approx.
- Samples A and (g) (approx. 0.2 g) were evenly placed in a non-woven teabag bag (7 x 9 cm) and immersed in 500 cc of physiological saline at 25 ° C for 1 minute. After that, the tea bag bag was pulled up, set in a centrifuge, and centrifuged at 1500 rpm for 3 minutes. The weight B ′ (g) of the tea bag bag after centrifugation was measured. The same operation as a blank was performed using only a tea bag bag without adding a sample, and the weight C ′ (g) was measured. The water absorption ratio was obtained from the following equation, and this was taken as the initial water absorption rate.
- the bond strength of the water-absorbent resin particle aggregates was measured with a Kiya digital hardness meter KHT-20N manufactured by Fujiwara Seisakusho.
- the measured particle agglomerates were 2 mm in diameter, measured 10 times, the maximum value and the minimum value were removed, and the average value was obtained.
- Water-absorbent rosin (0.500 g) was dispersed in 1000 ml of deionized water, stirred at 23 ° C. for 16 hours, and then filtered through filter paper.
- the solution of the beaker was subjected to colloidal titration using NZ400-polyvinyl potassium sulfate aqueous solution, and titration Ami was determined with the time when the color of the solution changed from blue to reddish purple as the end point of titration.
- the same operation was performed using 50 g of deionized water instead of 50 g of the filtrate, and a titration Bml was obtained as a blank titration.
- Water-soluble component amount (% by weight)
- the water-soluble component amount (% by weight) of the water-absorbent rosin was calculated.
- the absorber was cut into a circle with a diameter of 59.5 mm, its weight A ′ ′ (g) was measured, and a wire was passed through the circumferential part force at lcm.
- the absorbent body was immersed in a 500 cc physiological saline solution at a liquid temperature of 25 ° C together with the wire. After 3 hours, lift the absorbent body from the physiological saline, suspend it for 10 minutes so that the absorbent body does not come into contact with other things, drain the water, remove the wire, and remove the water-containing absorbent body and the attached water.
- Weight B '' (g) was measured.
- the absorption capacity of the absorber was determined from the following equation.
- the absorber was cut into a circle with a diameter of 59.5 mm, and its weight A '' '(g) was measured.
- the absorbent was immersed in 500 cc of physiological saline at a liquid temperature of 25 ° C for 1 minute with the wire. Thereafter, the absorbent was also lifted with physiological saline, the wire was pulled out and set in a centrifuge, and centrifuged at 1500 rpm for 3 minutes.
- the weight B ′ ′ ′ (g) of the absorbent after centrifugation was measured.
- the absorption capacity of the absorber was obtained from the following equation, and this was taken as the initial water absorption rate.
- Wako Pure Chemical's special grade acrylic acid was distilled, and 211.75g of purified acrylic acid was weighed into a 500ml flask, and 185.50g of 26.5 wt% ammonia water was added dropwise with stirring while cooling. To 100 mol 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 400. 25 g.
- N, N′-methylenebisacrylamide dissolved in 0.5 g of water was added as a radical polymerizable crosslinking agent, and dissolved by stirring.
- ammonium persulfate 0.1081 g dissolved in 0.5 g water was added as a polymerization initiator.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the average particle size was 1200 ⁇ m, and the fat having a particle size of less than 300 ⁇ m was 6% by weight.
- the water absorption ratio by the Tea bag method was 70.1 times.
- Wako distilling Junyaku Co. special grade acrylic acid weighed purified acrylic acid 95. 04G in flask of 300 ml, was added dropwise to aqueous ammonia 89. 96 g of 25 weight 0/0 under stirring while cooling, 100 mole 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 185. 200 g. To this, 0.201 g of N ,, '-methylenebisacrylamide dissolved in 0.5 g of water was added and dissolved by stirring. Similarly, 0.0920 g of ammonium persulfate dissolved in 0.5 g of water was added.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the average particle size was 1200 ⁇ m, and the fat with a particle size of less than 300 ⁇ m was 6% by weight.
- the water absorption rate by the Tea bag method was 65.5 times.
- the resin hardness was 6.5N.
- Acrylonitrile was intermittently fed in an amount of 2% by weight (the acrylonitrile concentration was controlled at 0.5% by weight or more), and an accumulation reaction of ammonium acrylate was carried out, and 30% by weight was accumulated.
- the water absorption rate by the Tea bag method was 65.8 times.
- the resin hardness was 33.7N.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the average particle size was 1200 ⁇ m, and the fat with a particle size of less than 300 ⁇ m was 6% by weight.
- the water absorption rate by the Tea bag method was 80.2 times.
- the resin hardness was 13.6N.
- Polymerization is carried out in the same manner as in Production Example A2 to obtain an emulsion containing water-containing gel, and then the pressure is returned to normal pressure while blowing nitrogen into the reactor and heated to 75 ° C.
- the stirring speed was set to 300 rpm, and 8.5 g of Wako Pure Chemical's special grade ethanol was added as an alcohol having a water solubility of 1 wt% or more over 5 minutes. After the formation of large particles by agglomeration, the gel was recovered without warming.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the average particle size was 1200 ⁇ m, and the fat with a particle size of less than 300 ⁇ m was 6% by weight. Tea ba
- the water absorption rate by the g method was 64.4 times.
- the resin hardness was too brittle and unmeasurable.
- Wako distilling Junyaku Co. special grade acrylic acid weighed purified acrylic acid 95. 04G in flask of 300 ml, was added dropwise to aqueous ammonia 89. 96 g of 25 weight 0/0 under stirring while cooling, 100 mole 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 185. 200 g. To this was added 0.0021 g of N, ⁇ '-methylenebisacrylamide dissolved in 0.5 g of water, and dissolved by stirring. Similarly, 0.0920 g of ammonium persulfate dissolved in 0.5 g of water was added.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the average particle size was 1200 ⁇ m, and the fat with a particle size of less than 300 ⁇ m was 6% by weight.
- the water absorption rate by the Tea bag method was 75.8 times.
- the water-soluble content was 31%.
- N, N′-methylenebisacrylamide dissolved in 0.5 g of water was added as a radical polymerizable crosslinking agent, and dissolved by stirring.
- ammonium persulfate 0.1081 g dissolved in 0.5 g water was added as a polymerization initiator.
- the produced hydrogel was recovered by filtration and recovered by vacuum drying at 100 ° C.
- the produced water-absorbent resin particle aggregate was heat-treated at 180 ° C. for 15 minutes using an inert oven.
- the average particle diameter of the water-absorbent resin particle aggregate thus obtained was 1200 ⁇ m, and the primary particle diameter was 161 ⁇ m.
- the water-absorbent coagulant particle aggregate obtained in this way was sieved using a sieve having a mesh opening of 850 m and 140, and the one remaining on the 1400 m sieve, and 850 Particles that passed through the sieve of m were removed, and the outer surface neutralization rate and internal neutralization rate, initial water absorption rate, water absorption rate, water-soluble content, and bond strength were measured.
- Wako distilling Junyaku Co. special grade acrylic acid, weighed purified acrylic acid 95. Og in flasks of 300 ml, was added dropwise to aqueous ammonia 90. Og of 25 weight 0/0 under stirring while cooling, 10 0 mole 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 185. Og.
- Og and 1. lg sorbitan monostearate as a surfactant were charged into a 2L separable flask with a reflux condenser tube with nitrogen inside the brute force system, and dissolved by stirring at room temperature.
- the above-mentioned aqueous ammonium acrylate solution was added, and the mixture was suspended with sufficient stirring at 200 rpm while flowing nitrogen.
- force the water bath at 60 ° C. Depressurize the inside of the reactor to 65 kPa and start polymerization while maintaining the internal temperature at 60 ° C. Hold the stirring speed at 200 rpm for 2 hours to maintain the water-containing gel.
- Emulsion containing was obtained The pressure was returned to normal pressure while blowing nitrogen into the reactor, and heated in a 75 ° C hot water bath.
- the stirring speed was set to 300 rpm, and 8.5 g of Wako Pure Chemicals special grade ethanol was added over 5 minutes as a water-soluble solvent having a solubility in water of 1% by weight or more. After stirring for 30 minutes, 6.0 g of special grade ethanol manufactured by Wako Pure Chemicals was further added and stirring was continued. After the formation of large particles by agglomeration, the mixture was heated with stirring for 1 hour.
- the produced hydrogel was collected by filtration and vacuum dried at 100 ° C.
- the water-absorbent coagulant particle aggregate obtained in this way was sieved using a sieve having a mesh opening of 850 m and 140, and the one remaining on the 1400 m sieve, and 850 Particles that passed through the sieve of m were removed, and the outer surface neutralization rate and internal neutralization rate, initial water absorption rate, water absorption rate, water-soluble content, and bond strength were measured.
- Ammonium acrylate was prepared by the following procedure.
- bacterial cell suspension (dried cell 1 5 wt 0/0) and washed with.
- a 5% potassium persulfate aqueous solution was mixed to obtain a heavy product.
- the obtained aqueous acrylic acid solution was colorless and transparent.
- reaction solution was prepared under the same conditions and purified using the UF membrane (Asahi Kasei Pencil type module SIP-0013), clogging and other phenomena were not observed, and the entire solution could be processed.
- a highly pure 30% by weight aqueous acrylic acid solution was obtained.
- 200 ppm of methoxyquinone was added, and the solution was concentrated to 70% by weight under light-shielding reduced pressure.
- the produced water-absorbent coagulum was heat-treated at 180 ° C. for 10 minutes using an inert oven.
- the average particle diameter of the water-absorbent greaves particle aggregate thus obtained is 1350.
- the primary particle size was 120 ⁇ m.
- the inside of the reactor was depressurized and polymerization was started while maintaining the internal temperature at 70 ° C.
- the polymerization rate was maintained for 2 hours while maintaining the stirring speed at lOOrpm. Got. While blowing nitrogen into the reactor, return the pressure to normal pressure and heat at a jacket temperature of 75 ° C.
- the stirring speed was set at 300 rpm, and a mixture of 55 g Wako Pure Chemical grade ethanol and 7 g Wako Pure Chemical grade glycerin was added over 5 minutes as an alcohol having a solubility in water of 1% by weight or more.
- 2 Og of Wako Pure Chemicals special grade ethanol was added and stirring was continued.
- the inside of the reactor was heated and pressurized while stirring to raise the inside of the reactor to 110 ° C. While stirring, the temperature was kept at 110 ° C and heated for 1 hour.
- the produced water-absorbent coagulum was heat-treated at 180 ° C. for 10 minutes using an inert oven.
- the average particle diameter of the water-absorbent resin particle aggregate thus obtained was 1420 ⁇ m, and the primary particle diameter was 100 ⁇ m.
- the water-absorbent coagulated particle aggregate thus obtained was sieved using a sieve with an opening of 850 ⁇ m and 1400 ⁇ m, and the one remaining on the 1400 m sieve, and Particles that passed through the 850 m sieve were removed, and the outer surface neutralization rate and internal neutralization rate, initial water absorption rate, water absorption rate, bond strength, and water-soluble content were measured.
- the gel was collected without heating.
- the produced water-absorbent resin particle aggregate was heat-treated at 170 ° C. for 30 minutes using an inert oven.
- the average particle diameter of the water-absorbent greaves particle aggregate thus obtained is 12
- the primary particle size was 120 ⁇ m.
- Wako distilling Junyaku Co. special grade acrylic acid weighed purified acrylic acid 95. 04G in flask of 300 ml, was added dropwise to aqueous ammonia 89. 96 g of 25 weight 0/0 under stirring while cooling, 100 mole 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 185. 200 g.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the produced water-absorbent coagulum was heat-treated at 180 ° C. for 10 minutes using an inert oven.
- the average particle size of the water-absorbent cocoon aggregate thus obtained was 1200 m, and the primary particle size was 120 ⁇ m.
- the water-absorbent coagulated particle aggregate thus obtained was sieved using a sieve with an opening of 850 ⁇ m and 1400 ⁇ m, and the one remaining on the 1400 m sieve, and 850 m Particles that passed through the sieve were removed, and the outer surface neutralization rate, internal neutralization rate, water absorption rate, and bond strength were measured.
- Wako Pure Chemical's special grade acrylic acid was distilled, 753 g of purified acrylic acid was weighed out, cooled to a temperature of 30 ° C or less with ice-cooling, and stirred with Wako Pure Chemical Co., Ltd. ⁇ Nmo - dropwise ⁇ water 625 g, 100 mol 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 1378 g.
- the stirring speed was set to 500 rpm, and a mixture of 35 g of Wako Pure Chemical's special grade isopropanol and 8 g of Wako Pure Chemical's special grade glycerin was added over 5 minutes as an alcohol having a solubility in water of 1% by weight or more. After stirring for 30 minutes, 25 g of special grade isopropanol made by Wako Pure Chemicals was further added and stirring was continued. After large particles were produced by agglomeration, the mixture was heated with stirring for 3 hours while stirring.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the produced water-absorbent coagulum aggregate was heat-treated at 170 ° C for 30 minutes using an inert oven.
- the average particle size of the water-absorbent cocoon aggregate thus obtained was 3000 m, and the primary particle size was 700 ⁇ m.
- the water-absorbent coagulated particle aggregate thus obtained was sieved using a sieve with an opening of 850 ⁇ m and 1400 ⁇ m, and the one remaining on the 1400 m sieve, and Particles that passed through an 850 m sieve were removed, and the outer surface neutralization rate and internal neutralization rate, initial water absorption rate, water absorption rate, and bond strength were measured.
- Wako Pure Chemical's special grade acrylic acid was distilled, 18 g of purified acrylic acid was weighed, and 13 g of water was added. While cooling in an ice-cold below the liquid temperature 30 ° C, manufactured by Wako Pure Chemical Industries, Ltd. under stirring, dropping ammonia water 18g of reagent special grade 25 weight 0/0, 100 mole 0/0 neutralization of acrylic acid 56 g of an aqueous ammonia solution was produced.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the produced water-absorbent resin particle aggregate was heat-treated at 170 ° C. for 30 minutes using an inert oven.
- the average particle size of the water-absorbent greaves particle aggregate thus obtained is 90
- the primary particle size was 120 ⁇ m.
- the water-absorbent coagulated particle aggregate thus obtained was sieved using a sieve with an opening of 850 ⁇ m and 1400 ⁇ m, and the one remaining on the 1400 m sieve, and Particles that passed through the 850 m sieve were removed, and the outer surface neutralization rate and internal neutralization rate, water absorption ratio, binding The strength was measured.
- Wako distilling Junyaku Co. special grade acrylic acid weighed purified acrylic acid 95. 04G in flask of 300 ml, was added dropwise to aqueous ammonia 89. 96 g of 25 weight 0/0 under stirring while cooling, 100 mole 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 185. 200 g.
- the produced water-absorbent rosin particles were heated at 180 ° C. for 10 minutes using an inert oven.
- the average particle diameter of the water-absorbing resin particles thus obtained was 161 ⁇ m.
- the outer surface neutralization rate, the internal neutralization rate, the water absorption capacity, and the bond strength of the water-absorbing resin particles were measured. 7
- Wako distilling Junyaku Co. special grade acrylic acid weighed was purified acrylic acid 95. 0 g in flasks of 300 ml, was added dropwise to aqueous ammonia 90. 0 g of 25 wt 0/0 under stirring while cooling, 10 0 mole 0/0 neutralization of ammonium acrylate - to produce a ⁇ anhydrous solution 185. 0 g.
- the produced hydrogel was collected by filtration and collected by vacuum drying at 100 ° C.
- the produced water-absorbent coagulum aggregate was heat-treated at 120 ° C. for 60 minutes using an inert oven.
- the average particle size of the water-absorbent cocoon aggregate thus obtained was 1200 m, and the primary particle size was 120 ⁇ m.
- the water-absorbent coagulated particle aggregate thus obtained was sieved using a sieve with an opening of 850 ⁇ m and 1400 ⁇ m, and the one remaining on the 1400 m sieve, and Particles that passed through an 850 m sieve were removed, and the outer surface neutralization rate and internal neutralization rate, water absorption ratio, water soluble content, and bond strength were measured.
- This water-absorbent rosin particle aggregate caused a macho phenomenon during the measurement of the water absorption ratio, gel-blocked, and the whole did not absorb water.
- Og and 1. lg sorbitan monostearate as a surfactant were charged into a 2L separable flask with a reflux condenser tube with nitrogen inside the brute force system, and dissolved by stirring at room temperature.
- the above-mentioned aqueous ammonium acrylate solution was added, and the mixture was suspended with sufficient stirring at 200 rpm while flowing nitrogen.
- force the water bath at 60 ° C. Depressurize the inside of the reactor to 65 kPa and start polymerization while maintaining the internal temperature at 60 ° C. Hold the stirring speed at 200 rpm for 2 hours to maintain the water-containing gel. Obtained emulsion containing nitrogen.
- the produced water-absorbent coagulum aggregate was heat-treated at 150 ° C for 30 minutes using an inert oven.
- the average particle diameter of the water-absorbent resin particle aggregate thus obtained was 1000 ⁇ m, and the particle diameter of the primary particles was 100 ⁇ m.
- the water-absorbent coagulated particle aggregate thus obtained was sieved using a sieve with an opening of 850 ⁇ m and 1400 ⁇ m, and the one remaining on the 1400 m sieve, and Particles that passed through an 850 m sieve were removed, and the outer surface neutralization rate, internal neutralization rate, water absorption capacity, and bond strength were measured.
- This water-absorbent rosin particle aggregate caused a macho phenomenon during the measurement of the water absorption ratio, gel-blocked, and the whole did not absorb water.
- the flask was kept warm in a water bath so that the liquid temperature was kept at 30 ° C.
- the aqueous solution was deaerated by publishing with nitrogen gas, and the reaction system was purged with nitrogen.
- 0.86g of 42% by weight aqueous solution of dalyserin was added with a syringe, and after stirring well, 0.017g of 30wt% aqueous solution of hydrogen peroxide dissolved in lg of water and 0.0415g of Rongalite were added.
- Polymerization started.
- the internal temperature started from 30 ° C and increased to 100 ° C in 10 minutes from the start of the reaction. Then, it was heated in a water bath for 3 hours so that the internal temperature was maintained at 70 ° C.
- the gel was taken out from the Separa flask and coarsely crushed, and then dried at 100 ° C. using a vacuum dryer. After completion of drying, the mixture was pulverized with a homogenizer and sieved to collect 850 m: L 000 m.
- the water-absorbent resin particles thus obtained had an average particle size of 925 ⁇ m.
- the water-absorbent coagulated particle aggregate thus obtained was sieved using a sieve with an opening of 850 ⁇ m and 1400 ⁇ m, and the one remaining on the 1400 m sieve, and The particles that passed through the 850 m sieve were removed, and the initial absorption rate and water absorption ratio were measured.
- Production Example Table 3 shows the production conditions of B1 to B13 and the physical properties of the water-absorbent resin particle aggregates.
- the body fluid absorbent article using the water-absorbent coagulated particle aggregate (1) produced in Production Example B1 is described below.
- Benlyse As a base material, “Benlyse” (registered trademark) manufactured by Asahi Kasei Fibers Co., Ltd. (Benlyse is a continuous long-fiber non-woven cloth with a cell mouth of 100%. Since it is a long fiber, it has sufficient strength when it contains water and has excellent liquid diffusibility. Various physical properties of Benrise are shown in Table 4), and cut into a circle with a diameter of 59.5 mm. The weight of this base material was measured to be 0.0966 g.
- Teflon (1) Teflon (1)
- Teflon (2) 0.16 g of water-absorbent slag particle aggregate (1) having an average particle diameter of 850 to 1200 m is arranged in the same manner as Teflon (1) so that the particles do not contact each other. This was designated as Teflon (2).
- the base material (Benize) was allowed to stand on Teflon (1), and 3 ml of water was sprayed using a spray bottle.
- Teflon (1) was turned upside down and allowed to stand on the Teflon (2) so that the substrate surface and the particle surface of the Teflon (2) overlapped.
- the weight of the absorber was measured and found to be 0.4061 g.
- the weight ratio of the water-absorbing resin in the absorbent is calculated to be 80.4%.
- All of the water-absorbent agglomerated particle aggregates (1) were firmly adhered to the base material (Benlyse), and did not detach even when rubbed by hand.
- the adhesion form was observed with a scanning electron microscope QEOLi ⁇ iSM-5300), all particles were adhered in such a way that the fibers were taken into the water-absorbent resin.
- the absorption capacity of this absorber was 54. l (gZg), and the absorption capacity after 1 minute was 7 (gZg).
- the method for producing a water-absorbent resin particle aggregate and the water-absorbent resin particle aggregate of the present invention are widely used in the production field of absorbent materials used in the fields of hygiene materials, agriculture and forestry, civil engineering, and the like. Can do.
- absorbent bodies such as sanitary articles such as disposable diapers and sanitary napkins.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Epidemiology (AREA)
- Veterinary Medicine (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Dispersion Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerisation Methods In General (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008509687A JPWO2007116554A1 (ja) | 2006-03-31 | 2006-11-01 | 吸水性樹脂粒子凝集体及びその製造方法 |
EP06822789A EP2006306A4 (en) | 2006-03-31 | 2006-11-01 | METHOD FOR THE PRODUCTION OF AGGLOMERATES OF WATER ABSORBENT RESIN PARTICLES AND METHOD OF MANUFACTURING THEREOF |
CA2648010A CA2648010C (en) | 2006-03-31 | 2006-11-01 | Water absorbing resin particle agglomerates and a manufacturing method of the same |
US12/225,718 US20090169891A1 (en) | 2006-03-31 | 2006-11-01 | Water Absorbing Resin Particle Agglomerates and Manufacturing Method of the Same |
US13/102,333 US20110204289A1 (en) | 2006-03-31 | 2011-05-06 | Water Absorbing Resin Particle Agglomerates and a Manufactiring Method of the Same |
Applications Claiming Priority (2)
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JP2006097028 | 2006-03-31 | ||
JP2006-097028 | 2006-03-31 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/102,333 Division US20110204289A1 (en) | 2006-03-31 | 2011-05-06 | Water Absorbing Resin Particle Agglomerates and a Manufactiring Method of the Same |
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WO2007116554A1 true WO2007116554A1 (ja) | 2007-10-18 |
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PCT/JP2006/321860 WO2007116554A1 (ja) | 2006-03-31 | 2006-11-01 | 吸水性樹脂粒子凝集体及びその製造方法 |
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US (2) | US20090169891A1 (ja) |
EP (2) | EP2202249A1 (ja) |
JP (1) | JPWO2007116554A1 (ja) |
KR (1) | KR20080094929A (ja) |
CN (2) | CN102212156A (ja) |
CA (1) | CA2648010C (ja) |
TW (1) | TW200736280A (ja) |
WO (1) | WO2007116554A1 (ja) |
Cited By (2)
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CN107522991A (zh) * | 2017-09-27 | 2017-12-29 | 万华化学集团股份有限公司 | 一种采用一步反相悬浮聚合制备的高吸水性树脂及其制备方法 |
WO2019189325A1 (ja) * | 2018-03-27 | 2019-10-03 | 住友精化株式会社 | 吸水性スクラブ剤、その製造方法、及び化粧料 |
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TWI363061B (en) | 2005-05-13 | 2012-05-01 | Asahi Kasei Chemicals Corp | Absorbent composite material and method for manufacturing the same |
WO2007126003A1 (ja) | 2006-04-27 | 2007-11-08 | Sumitomo Seika Chemicals Co., Ltd. | 吸水性樹脂の製造方法 |
KR101778339B1 (ko) * | 2010-07-28 | 2017-09-13 | 스미토모 세이카 가부시키가이샤 | 흡수성 수지의 제조 방법 |
WO2012014749A1 (ja) | 2010-07-28 | 2012-02-02 | 住友精化株式会社 | 吸水性樹脂の製造方法 |
CN103003312B (zh) | 2010-07-28 | 2015-05-13 | 住友精化株式会社 | 吸水性树脂的制造方法 |
JP5805641B2 (ja) | 2010-07-28 | 2015-11-04 | 住友精化株式会社 | 吸水性樹脂の製造方法 |
JP6018582B2 (ja) * | 2011-12-16 | 2016-11-02 | 綜研化学株式会社 | 樹脂粒子群およびその製造方法ならびに樹脂粒子群の粒子の粒度調整方法 |
KR101430923B1 (ko) * | 2012-02-24 | 2014-08-18 | 전남대학교산학협력단 | 천연고분자를 함유한 흡수성 수지용 조성물 및 이로부터 제조된 흡수성 수지 |
KR102418916B1 (ko) | 2017-09-05 | 2022-07-07 | 주식회사 엘지화학 | 고흡수성 수지 |
KR102417078B1 (ko) | 2017-09-05 | 2022-07-04 | 주식회사 엘지화학 | 고흡수성 수지 |
KR102666774B1 (ko) * | 2018-12-17 | 2024-05-16 | 스미토모 세이카 가부시키가이샤 | 흡수성 수지, 흡수체, 흡수성 물품, 및 흡수성 수지의 제조 방법 |
EP3936540A1 (en) * | 2019-03-08 | 2022-01-12 | Sumitomo Seika Chemicals Co., Ltd. | Water absorbing resin particles and method for producing same, absorbent body, and absorbent article |
CN112876586B (zh) * | 2021-01-18 | 2022-11-08 | 万华化学(四川)有限公司 | 一种abs接枝胶乳的凝聚方法 |
CN112876702B (zh) * | 2021-01-19 | 2022-07-12 | 万华化学集团股份有限公司 | 一种一步聚合法制备高吸水树脂及其制备方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107522991A (zh) * | 2017-09-27 | 2017-12-29 | 万华化学集团股份有限公司 | 一种采用一步反相悬浮聚合制备的高吸水性树脂及其制备方法 |
CN107522991B (zh) * | 2017-09-27 | 2020-05-08 | 万华化学集团股份有限公司 | 一种采用一步反相悬浮聚合制备的高吸水性树脂及其制备方法 |
WO2019189325A1 (ja) * | 2018-03-27 | 2019-10-03 | 住友精化株式会社 | 吸水性スクラブ剤、その製造方法、及び化粧料 |
Also Published As
Publication number | Publication date |
---|---|
TW200736280A (en) | 2007-10-01 |
CA2648010A1 (en) | 2007-10-18 |
CA2648010C (en) | 2011-08-23 |
EP2202249A1 (en) | 2010-06-30 |
US20110204289A1 (en) | 2011-08-25 |
JPWO2007116554A1 (ja) | 2009-08-20 |
CN102212156A (zh) | 2011-10-12 |
CN101410419A (zh) | 2009-04-15 |
KR20080094929A (ko) | 2008-10-27 |
EP2006306A1 (en) | 2008-12-24 |
US20090169891A1 (en) | 2009-07-02 |
EP2006306A4 (en) | 2009-09-02 |
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