| Sumitomo Seika Chemicals Co., Ltd. Patent applications |
| Patent application number | Title | Published |
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| 20120136175 | PROCESS FOR PREPARATION OF ALKYL SULFONE COMPOUNDS - An object of the present invention is to provide a method for preparation of an alkyl sulfone compound simply and safely with high yield, and an alkyl sulfone compound. | 05-31-2012 |
| 20120123066 | METHOD FOR PRODUCING ALIPHATIC POLYCARBONATE - The present invention provides an aliphatic polycarbonate production method which, using carbon dioxide and an epoxide, easily produces aliphatic polycarbonates having a low metal catalyst content. | 05-17-2012 |
| 20120123015 | WATER-SOLUBLE POLYMER COMPOSITION, COMPOSITION FOR FORMING PLASTER LAYER OF SKIN PATCH, AND SKIN PATCH - The present invention relates to a water-soluble polymer composition which comprises a water-soluble poly(meth)acrylic polymer and a gelation rate retarding agent, and a composition for forming a plaster layer of a skin patch which is obtainable by adding a polyvalent metal compound to the water-soluble polymer composition. When a polyvalent metal compound is added, the aforesaid water-soluble polymer composition shows an appropriate induction period before the start of the hardening of the gel. When the water-soluble polymer composition is used for forming a plaster layer of a skin patch, therefore, additive ingredients can be uniformly mixed and the procedure for coating to a support can be facilitated. | 05-17-2012 |
| 20120095179 | PYRROLINE-BASED NITROXIDE POLYMER AND BATTERY USING SAME - The present invention provides a pyrroline nitroxide polymer, an electrode active material containing the polymer, and a cell utilizing the electrode active material. | 04-19-2012 |
| 20120094880 | RESIN COMPOSITION WHOSE LUBRICITY UNDER WET CONDITIONS IS MAINTAINED - Provided is a resin composition that will suffer from little drop of lubricity and will offer good touch feeling even if it is used repeatedly. A resin composition superior in lubricity and touch feeling is produced by melt-mixing a water-soluble polyethylene oxide having a viscosity average molecular weight of 1,000,000 to 6,000,000, a modified polyalkylene oxide obtainable by reacting a polyalkylene oxide, a diol compound, and a diisocyanate compound together, and a thermoplastic resin together. | 04-19-2012 |
| 20120089108 | WATER ABSORBENT SHEET - A water-absorbent sheet comprising a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched with a hydrophilic nonwoven fabric, wherein the water-absorbent sheet has a structure in which the absorbent layer is fractionated into a primary absorbent layer and a secondary absorbent layer with a substrate layer formed by laminating two or more layers of a substrate having breathability adhered together with an adhesive, wherein the substrate layer satisfies the following requirements (1) and (2): (1) the substrate layer having a basis weight of 25 g/m | 04-12-2012 |
| 20120029456 | WATER-ABSORBENT SHEET - A water-absorbent sheet comprising a structure comprising at least an absorbent layer containing a water-absorbent resin, sandwiched between two or more sheets of a hydrophilic nonwoven fabric, wherein the water-absorbent sheet is subjected to wavy embossing | 02-02-2012 |
| 20110306797 | SULFONE COMPOUND - It is an object of the present invention to provide an aprotic polar solvent mainly useful as a solvent for an electrochemical device, and having a comparatively low melting point and excellent thermal stability. | 12-15-2011 |
| 20110288307 | METHOD FOR MANUFACTURING SULFOLENE COMPOUND AND METHOD FOR MANUFACTURING SULFOLANE COMPOUND - An object of the present invention is to provide a method for manufacturing a sulfolene compound, the method being capable of inhibiting generation of polymers. Another object of the present invention is to provide a method for manufacturing a sulfolane compound, the method being capable of controlling inhibition of hydrogenation catalyst activity and smoothly hydrogenating a sulfolene compound. | 11-24-2011 |
| 20110276019 | WATER-ABSORBENT SHEET COMPOSITION - A water-absorbent sheet composition ( | 11-10-2011 |
| 20110270204 | WATER-ABSORBENT SHEET COMPOSITION - A water-absorbent sheet composition containing a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched with two or more sheets of hydrophilic nonwoven fabrics, wherein the water-absorbent sheet composition has a structure in which the absorbent layer is separated in divided parts of a primary absorbent layer and a secondary absorbent layer with a water-permeable substrate having a water permeability index of from 20 to 90, and wherein the water-absorbent resin is contained in the absorbent layer in an amount of from 100 to 1000 g/m | 11-03-2011 |
| 20110257438 | SULFONE COMPOUND - It is an object of the present invention to provide an aprotic polar solvent mainly useful as a solvent for an electrochemical device, and having a comparatively low melting point and excellent thermal stability. | 10-20-2011 |
| 20110245575 | PARAFFIN PURIFICATION METHOD AND APPARATUS - A method for purifying a paraffin from a source material containing a paraffin having 2 to 6 carbon atoms and an olefin having 2 to 6 carbon atoms includes a first step of bringing the source material into contact with a silver ion-containing solution (absorption liquid) at a predetermined temperature and pressure in an absorption column | 10-06-2011 |
| 20110151228 | WATER-ABSORBENT SHEET COMPOSITION - A water-absorbent sheet composition comprising a structure in which a water-absorbent resin and a hot melt adhesive are sandwiched with two or more sheets of hydrophilic nonwoven fabrics, wherein the hydrophilic nonwoven fabrics have a basis weight of 25 g/m | 06-23-2011 |
| 20110111199 | WATER-ABSORBENT SHEET COMPOSITION - A water-absorbent sheet composition comprising a structure in which a water-absorbent resin and a hot melt adhesive are sandwiched with two or more sheets of hydrophilic nonwoven fabrics, wherein the hydrophilic nonwoven fabrics have a basis weight of 30 g/m | 05-12-2011 |
| 20110105709 | WATER-SOLUBLE ACRYLIC ACID SALT POLYMER AND GELLING BASE - The present invention provides a water-soluble acrylate polymer that makes it possible to obtain a gelling base having a gel strength recited below when the gelling base comprises the components and the proportions thereof listed below;
| 05-05-2011 |
| 20110090568 | RESIN PARTICLE HAVING MANY RECESSES ON THE SURFACE THEREOF - The present invantion provides a resin particle having many recesses on the surface thereof, which has solvent resistance and heat resistance. More specifically, the present invantion provides a resin particle having many recesses on the surface thereof which is obtained by using a seed particle, wherein a seed particle component in the resin particle has a crosslinked structure. Since the resin particle having many recesses on the surface thereof of the present invention is excellent in solvent resistance and heat resistance in addition to light diffusing properties, the resin particle is appropriate for use, for example, in not only cosmetics containing silicone oil and the like in a preparation, a light diffusing film and a light diffusing sheet prepared by dispersing resin particles as a light diffusing agent in an organic solvent such as 2-butanone and the like in a production process, and a light diffusing plate prepared by kneading at a high shear force the resin patticles as a light diffusing agent with polystyrene or polymethyl methacrylate and the like which melts at a high temperature of approximately 300° C. in a production process. | 04-21-2011 |
| 20110068300 | WATER-ABSORBING RESIN COMPOUND - The object of the present invention is to provide a water-absorbing resin compound, wherein the water-absorbing resin compound can retain antibacterial properties of an antibacterial metal to suppress the emission of unpleasant odors even when an organic material exists in a system in the case of using an eluting-type antibacterial agent. Thus, the present invention relates to a water-absorbing resin compound, which comprises a water-absorbing resin, an antibacterial agent having a porous material incorporating an antibacterial metal, and a metal chelating agent. Further, the present invention also relates to an absorbing material, which comprises a water-absorbing resin compound of the present invention, and a hydrophilic fiber as well as an absorbing product, which comprises a liquid-permeable sheet and a liquid-non-permeable sheet, and an absorbing material comprising a water-absorbing resin compound of the present invention, and a hydrophilic fiber between the liquid-permeable sheet and the liquid-non-permeable sheet. | 03-24-2011 |
| 20110021642 | WATER-SOLUBLE ACRYLIC ACID SALT POLYMER AND GELLING BASE - An object of the present invention is to provide a water-soluble acrylate polymer that can form a gelling base. When used in forming a poultice or cooling sheet, the gelling base not only imparts desirable stretchability, but also has an appropriate reaction rate with a polyvalent metal. The gelling base is free from gel penetration to the back side of a support or gel seeping from the support while the gel is being cured, and is easily applied to the support. When the gelling base is gelated by being allowed to stand under the conditions of 25° C. and a relative humidity of 60%, the gel strength is 3,200 to 7,000 dyn/cm | 01-27-2011 |
| 20100331802 | WATER-ABSORBENT RESIN SUITABLE FOR USE IN HYGIENIC MATERIALS - The present invention provides a water-absorbent resin produced by a reversed-phase suspension polymerization method, which contains a small amount of a petroleum hydrocarbon dispersion medium remaining therein used in reversed-phase suspension polymerization, and thus reducing an odor originating from the petroleum hydrocarbon dispersion medium, when the water-absorbent resin absorbs water, and also which is suitable for use in hygienic materials; an absorbent material and an absorbent article. More particularly, the present invention provides a water-absorbent resin obtained by subjecting an aqueous solution of a water-soluble ethylenically unsaturated monomer to reversed-phase suspension polymerization in a petroleum hydrocarbon dispersion medium in the presence of a surfactant, wherein the amount of the petroleum hydrocarbon dispersion medium remaining in the water-absorbent resin is 2,000 ppm or less; and an absorbent material and an absorbent article using the same. | 12-30-2010 |
| 20100324299 | METHOD FOR PURIFICATION OF PYRIDINE, AND METHOD FOR PRODUCTION OF CHLORINATED PYRIDINE - A method of purifying crude pyridine on an industrial scale at low cost and in a simple manner is provided. More specifically, a pyridine purification method including subjecting crude pyridine to an alkali treatment and then to distillation, or a pyridine purification method including adding an acid or water to crude pyridine, and subjecting the resulting mixture to an alkali treatment and then to distillation is provided. According to the purification method of the present invention, crude pyridine can be purified on an industrial scale at low cost and in a simple manner. Moreover, the pyridine purified by this method is useful as a starting material for various organic syntheses because of its high purity. For example, the pyridine can be reacted with chlorine to produce a chlorinated pyridine in a high yield. | 12-23-2010 |
| 20100294130 | METHOD AND APPARATUS FOR SEPARATING HYDROGEN GAS - A hydrogen gas separation method utilizing PSA process employs a plurality of adsorption towers A, B, C loaded with an adsorbent for separating the hydrogen gas from a hydrogen-containing gas mixture, and a cycle including introducing the gas mixture into the adsorption tower, adsorbing unnecessary gas in the gas mixture by the adsorbent, leading out product gas having high hydrogen concentration from the adsorption tower, desorbing the unnecessary gas from the adsorbent, and leading out desorbed gas containing the unnecessary gas and residual gas in the adsorption tower from the adsorption tower, is repeated. The adsorbent includes an activated carbon-based first adsorbent D located on the upstream side of the flow direction of the gas mixture in the adsorption tower with an filling ratio of 60 to 80%, and a zeolite-based second adsorbent E located on the downstream side of the flow direction with filling ratio of 40 to 20%. | 11-25-2010 |
| 20100273647 | WATER-ABSORBING RESIN SUITABLE FOR ABSORBING VISCOUS LIQUIDS CONTAINING HIGH-MOLECULAR COMPOUND, AND ABSORBENT AND ABSORBENT ARTICLE EACH COMPRISING THE SAME - A water-absorbent resin is provided which is suitable for absorbing polymer-containing viscous liquids, wherein the specific surface area measured by the BET multipoint technique using krypton gas as the adsorption gas is no less than 0.05 m | 10-28-2010 |
| 20100267845 | (METH)ACRYLIC ACID/ALKYL (METH)ACRYLATE ESTER COPOLYMER AND COSMETIC PREPARATION CONTAINING THE SAME - A (meth)acrylic acid/alkyl (meth)acrylate ester copolymer containing constituents of 95.42 to 97.48% by mass of (meth)acrylic acid, 2.43 to 4.30% by mass of an alkyl (meth)acrylate ester of which alkyl group has 18 to 24 carbon atoms, and 0.08 to 0.30% by mass of a compound having two or more ethylenically unsaturated groups; and cosmetics blended with the copolymer. According to the copolymer of the present invention, a neutral viscous aqueous solution having a high viscosity can be formed even in the presence of an electrolyte in a relatively high concentration, without being affected by its temperature and electrolytic concentration; therefore, the copolymer of the present invention can be suitably used in cosmetics and the like. | 10-21-2010 |
| 20100233621 | PHOTOACID GENERATOR AND PHOTOREACTIVE COMPOSITION - An object of the present invention is to provide photoacid generator, which shows very high sensitivity in the near ultraviolet range of about 300 to 400 nm, and also can remarkably increase a reaction rate of a photoreactive composition using the same, and to provide a photoreactive composition which can initiate the reaction even by irradiation with near ultraviolet light within a short time and also can obtain a desired reaction product. More particularly, the present invention provides a dithienyl sulfide disulfonium salt represented by the formula (A1): | 09-16-2010 |
| 20100221392 | METHOD FOR FOAMING FOOD BY USING NITROUS OXIDE AS FOAMING AGENT - A container ( | 09-02-2010 |
| 20100197491 | METHOD FOR PRODUCTION OF WATER-ABSORBABLE RESIN, AND WATER-ABSORBABLE RESIN PRODUCED BY THE METHOD - A method for producing a water-absorbent resin, characterized by adding a bisoxetane compound represented by the following general formula (1): | 08-05-2010 |
| 20100196763 | GELLING AGENT FOR BATTERIES - The present invention has its object to provide a gelling agent for a battery, which forms a paste gel in a short period of time on dissolution in an alkaline electrolyte. The gel has less bubbles and a high gel density. | 08-05-2010 |
| 20100168360 | Process for Production of Crosslinked Poly(Meth) Acrylic Acid Nitroxide Compounds - The present invention relates to a crosslinked poly(meth)acrylic acid nitroxide compound resulting from crosslinking of a poly(meth)acrylic acid nitroxide compound, and an object of the present invention is to provide a method of inexpensively and easily producing a crosslinked poly(meth)acrylic acid nitroxide compound having a high radical concentration. | 07-01-2010 |
| 20100159245 | METHOD FOR PRODUCING GRANULATED CARBOXYL GROUP-CONTAINING POLYMER PARTICLE AND GRANULATED CARBOXYL GROUP-CONTAINING POLYMER PARTICLE - An object of the present invention is to provide a method for easily producing granular carboxyl group-containing polymer particles which have a high bulk density and readily swell in water. | 06-24-2010 |
| 20100000408 | HYDROGEN GAS SEPARATION METHOD AND SEPARATION APPARATUS - A method is provided for separating hydrogen gas from a mixed gas obtained by autothermal reforming reaction of hydrocarbon-based material in which air is added. In this method, by pressure swing adsorption using adsorption towers (A-C) each filled with an adsorbent, a cycle is repeatedly performed, including an adsorption step of introducing the mixed gas into the adsorption tower to adsorb unnecessary gas contained in the mixed gas by the adsorbent to discharge product gas with high hydrogen gas concentration from the adsorption tower, and a desorption step of desorbing the unnecessary gas from the adsorbent to discharge the unnecessary gas from the adsorption tower. The adsorbent includes a 10 to 50% filling percentage of activated carbon-based first adsorbent (D) arranged in the adsorption tower at an upstream portion in the flow direction of the mixed gas and a 90 to 50% filling percentage of zeolite-based second adsorbent (E) arranged in the adsorption tower at a downstream portion in the flow direction. | 01-07-2010 |
| 20090326162 | PROCESS FOR PRODUCTION OF WATER-ABSORBABLE RESIN - A method for producing a water-absorbent resin, characterized in that a precursor of the water-absorbent resin obtained by polymerizing a water-soluble ethylenically unsaturated monomer is subjected to a post-crosslinking reaction in the presence of a compound having plural hydrazide groups. The water-absorbent resin obtained by the method for producing a water-absorbent resin of the present invention is excellent in properties such as water-retention capacity, water-absorption capacity under load, and gel strength, and also gives consideration to safety of the water-absorbent resin by reducing water-soluble substance. Therefore, the water-absorbent resin of the present invention can be suitably used, for example, in hygienic materials such as disposable diaper, incontinence pad and sanitary napkin, in particular, in disposable diaper. | 12-31-2009 |
| 20090306304 | CROSSLINKED (METH)ACRYLIC ACID COPOLYMER AND SECONDARY-CELL ELECTRODE EMPLOYING THE SAME - It is an object of the present invention to provide a crosslinked (meth)acrylic acid-type copolymer excellent in stability to a solvent, which causes substantially no crack due to drying when applied onto the surface of a current collector, and a secondary-cell electrode using the copolymer. | 12-10-2009 |
| 20090292078 | WATER-SOLUBLE COPOLYMER HAVING ALKYL-MODIFIED CARBOXYL GROUPS - The present invention provide a water-soluble copolymer having alkyl-modified carboxyl groups which is able to produce a neutralized viscous liquid in which although its viscosity is very low when no electrolyte exists, the viscosity greatly increases when electrolytes are added, which has a sufficiently high viscosity and a very high transmittance and which has moist textures without stickiness even in the presence of a relatively high concentration of electrolytes, and a thickening agent comprising the same. More specifically, the present invention proves a water-soluble copolymer having alkyl-modified carboxyl groups which is obtained by polymerizing 100 parts by weight of (meth)acrylic acid, 5-10 parts by weight of lauryl (meth)acrylate, and 0-0.1 parts by weight of a compound having two or more of ethylenic unsaturated groups, wherein a 1 weight %-neutralized viscous liquid shows a viscosity of 1000 mPa·s or lower and a transmittance of 95% or higher, and when 1-7 parts by weight of sodium chloride is added to 100 parts by weight of the neutralized viscous liquid, the liquid shows a highest viscosity of 10000-30000 mPa·s and a transmittance of 95% or higher, and a thickening agent comprising the same. | 11-26-2009 |
| 20090281247 | PROCESS FOR PRODUCTION OF WATER-ABSORBABLE RESIN PARTICLE, AND WATER-ABSORBABLE RESIN PARTICLE PRODUCED BY THE PROCESS - The present invention relates to a method of producing water-absorbent resin particles in which a median particle size of primary particles (d) and a median particle size of secondary particles (D) satisfy the relationship of the formula, 5d/3+150| 11-12-2009 | |
| 20090250182 | Papermaking Method and Papermaking System - A papermaking method according to this invention is carried out using a paper machine provided with a head box ( | 10-08-2009 |
| 20090240025 | Organic Zinc Catalyst, and Process for Production of Poly(Alkylene Carbonate) Using the Same - The present invention has for its object to provide a novel organic zinc catalyst showing very high polymerizing activity in the reaction for producing a poly(alkylene carbonate) from carbon dioxide and an epoxide as well as a method of producing a poly(alkylene carbonate) using the same. | 09-24-2009 |
| 20090238749 | Method for purification of nitrogen oxide and apparatus for purfication of nitrogen oxide - A nitrogen oxide purifying apparatus includes a gas absorption vessel ( | 09-24-2009 |
| 20090182092 | PROCESS FOR PRODUCTION OF WATER-ABSORBENT RESIN - A purpose of the present invention is to reduce odor of a water-absorbent resin during absorption of water. Such the invention is attained by a process for production of a water-absorbent resin by subjecting a water-soluble ethylenically unsaturated monomer to reversed-phase suspension polymerization. The process comprises the following steps (A) to (C): (A) adding an aqueous solution of water-soluble ethylenically unsaturated monomer to a petroleum hydrocarbon dispersion medium to disperse the aqueous solution in the dispersion medium; (B) adding a surfactant to the emulsion to further disperse the emulsion; and (C) performing the reversed-phase suspension polymerization using a water-soluble radical polymerization initiator, optionally in the presence of an internal-crosslinking agent. | 07-16-2009 |
| 20090173171 | Sample Introducing System - In a sample introducing system that can be easily adapted to a variety of analytical conditions without being affected by a flow rate of gas introduced into an analytical device, can introduce an analytical sample into the analytical device without loss, and can contribute to a simple and highly accurate high-sensitivity analysis, a pretreatment device removes unnecessary components from an untreated sample gas containing the analytical sample. A treated sample gas that has been pretreated by the pretreatment device is introduced into the analytical device via a connection gas flow channel. A gas addition device that adds a carrier gas to the treated sample gas flowing toward the analytical device in the connection gas flow channel has a means for changing the addition flow rate of the carrier gas. Pressure fluctuations of the gas containing the analytical sample are restricted by a pressure adjusting device upstream of the gas addition device. | 07-09-2009 |
| 20090149593 | AQUEOUS ETHYLENE/VINYL ALCOHOL COPOLYMER DISPERSION - It is an object of the present invention to provide an aqueous ethylene-vinyl alcohol-based copolymer dispersion which is excellent in long-term storage stability and in film-forming properties even when subjected to low-temperature or short-time drying or applied to give thick coats and can give coatings showing high gas barrier performance. The prevent invention is an aqueous ethylene/vinyl alcohol-based copolymer dispersion, which comprises: (A) an ethylene/vinyl alcohol-based copolymer with an ethylene content of 15-65 mole percent and a degree of saponification of not lower than 80 mole percent, (B) a base-neutralized ethylene/α,β-unsaturated carboxylic acid-based copolymer and (C) a polyvinyl alcohol with a degree of saponification of 75-100 mole percent and a degree of polymerization of 100-3500, the content of the polyvinyl alcohol (C) being 0.5-100 parts by weight per 100 parts by weight of the ethylene/vinyl alcohol-based copolymer (A). | 06-11-2009 |
| 20090148381 | METHOD FOR TREATMENT OF DRAIN IN HYDROGEN PRODUCTION AND HYDROGEN PRODUCTION SYSTEM - A method for treating drain in hydrogen production includes steps of gasifying in a gasifier ( | 06-11-2009 |
| 20090137823 | (E)-N-Monoalkyl-3-Oxo-3-(2-Thienyl) Propenamine and Process for Producing the Same and Process for Producing (E,Z)-N-Monoalkyl-3-Oxo-3-(2-Thienyl) Propenamine - The present invention provides a process for producing (E)-N-monoalkyl-3-oxo-3-(2-thienyl)propenamine represented by Formula (1); | 05-28-2009 |
| 20090137820 | PROCESS FOR PRODUCTION OF METHYLENE DISULFONATE COMPOUND - The present invention provides a process for producing a methylene disulfonate compound in a simple manner at low cost. | 05-28-2009 |
| 20090136736 | WATER-ABSORBING RESIN SUITABLE FOR ABSORBING VISCOUS LIQUIDS CONTAINING HIGH-MOLECULAR COMPOUND, AND ABSORBENT AND ABSORBENT ARTICLE EACH COMPRISING THE SAME - A water-absorbent resin is provided which is suitable for absorbing polymer-containing viscous liquids, wherein the specific surface area measured by the BET multipoint technique using krypton gas as the adsorption gas is no less than 0.05 m | 05-28-2009 |
| 20090104084 | HYDROGEN PRODUCTION SYSTEM AND METHOD OF CONTROLLING FLOW RATE OF OFFGAS IN THE SYSTEM - A hydrogen manufacturing system for performing offgas flow control includes: a vaporizer ( | 04-23-2009 |
| 20090082590 | 4-Mercaptophenyl ester of acetic acid and process for producing the same - The present invention provides a 4-mercaptophenyl ester of acetic acid, which is useful as a raw material for synthesizing a developer, etc., and a process for producing the same. The present invention provides a 4-mercaptophenyl ester of acetic acid represented by Formula (1); | 03-26-2009 |
| 20090036644 | METHOD OF REMOVING RESIDUAL ETHYLENE OXIDE MONOMER IN POLYETHYLENE OXIDE - The present invention relates to a method of removing a residual ethylene oxide monomer in polyethylene oxide used as a raw material for pharmaceutical preparations. More particularly, the method of the present invention comprises retaining high-molecular weight polyethylene oxide particles at a temperature not higher than a crystal melting point of the polyethylene oxide in the absence of an aggregation inhibitor under an atmospheric pressure in the standing state and, then, cooling the particles to 40° C. or lower under an atmospheric pressure and in the standing state, thereby, reducing a residual ethylene oxide monomer concentration to 1 ppm or lower without influencing on physical properties such as a specific surface area of the high-molecular weight polyethylene oxide particles. | 02-05-2009 |
| 20080319149 | Method for Producing Crosslinked Poly (Meth) Acrylate Compound - It is an object of the invention to provide a method of producing a crosslinked poly(meth)acrylic acid compound, in particular a method of producing a crosslinked poly(meth)acrylic acid nitroxide compound, which is a radical compound excellent in solvent stability. | 12-25-2008 |
| 20080280154 | Process for Producing Water-Absorbing Resin Particles, Water-Absorbing Resin Particles Made by the Process, and Absorbent Materials and Absorbent Articles Made by Using the Particles - The present invention provides a process for producing water-absorbing resin particles which possess a high water retention capacity (absorbing capacity), a high water-absorbing capacity under pressure, and a high gel strength and a small amount of water-soluble substance and is favorably usable in sanitary materials; water-absorbing resin particles obtained by the process; and absorbent materials and absorbent articles made by using the particles. More specifically, the water-absorbing resin particles are produced by a process for producing water-absorbing resin particles, comprising a step of a post-crosslinking reaction by adding a post-crosslinking agent in at least two stages to a water-absorbing resin particle precursor obtained by polymerization of a water-soluble ethylenic unsaturated monomer to carry out the post-crosslinking reaction. | 11-13-2008 |
