Abstract: A pressure-sensitive adhesive composition which is excellent in durability under high temperature and humidity conditions and can thus inhibit bright defect even when applied to a large-sized optical film; a pressure-sensitive adhesive; and an optical film. A pressure-sensitive adhesive composition comprising an acrylic copolymer (A) bearing a reactive functional group, an acrylic copolymer (B) and an isocyanate compound (C), wherein the quantity of the isocyanate compound (C) is 5 to 30 parts by weight per 100 parts by weight of a mixture of the acrylic copolymer (A) and the acrylic copolymer (B) and the elongation at break and 200% modulus as determined at 25 degrees C. by the tensile test are 300 to 1000% and 0.2 to 3 N/mm2 respectively.

Abstract: A superabsorbent having superior permeability and conveying properties comprises a permeability enhancing agent and a cohesion control agent and has a free swell gel bed permeability of at least 15 Darcies and a Hausner ratio in the range of 1.18 to 1.34.

Abstract: A pre-adhesive syrup copolymer composition comprising an acid functional acrylate solute copolymer, a monomer solvent mixture, and a polyaziridine crosslinking agent is disclosed.

Abstract: Provided are methods for producing a thermoplastic vulcanizate. One method includes charging vulcanizable rubber to a reactor; charging a masterbatch of thermoplastic resin and a catalyst for a phenolic resin curative to the reactor; charging a phenolic resin curative to the reactor; and dynamically vulcanizing the rubber with the phenolic resin curative in the presence of the catalyst. Also provided are thermoplastic vulcanizates made by the methods of the invention.

Abstract: The invention provides a composition that contains at least one specific non-crosslinkable organic medium at least one microgel and at least one thickening agent, a process for the preparation thereof and uses of the compositions.

Abstract: In one embodiment is a thermoplastic vulcanizates having improved extrusion properties formed from a composition that includes from 20% to about 80% by weight of an elastomer, from about 80% to about 20% by weight of a thermoplastic, from about 0.05 to about 12 phr of a multifunctional methacrylate monomer peroxide curing coagent; and from about 0.02 to about 6 phr of a phosphorous containing stabilizer. The resultant thermoplastic vulcanizate may be cured with a peroxide curing agent and shows improved die lip build up compared to conventionally prepared thermoplastic vulcanizates. Methods of forming thermoplastic vulcanizates having improved die lip build up are also taught.

Abstract: The present invention includes crosslinked perfluoroelastomeric compositions and molded articles formed from a cross-linkable perfluoroelastomeric composition having a first curable perfluoropolymer having a cure site monomer and a second perfluoropolymer having a cure site monomer. The molar ratio of the tetrafluoroethylene monomer to perfluoroalkylvinyl ether in one perfluoropolymer is about 0 to 100 to about 65 to 35 in the perfluoropolymer. The molar ratio of the tetrafluoroethylene monomer to the perfluoroalkylvinyl ether monomer in the second polymer is about 65:35 to about 95:5 in the second perfluoropolymer. The composition further includes a curative.

Abstract: The object of the present invention is to provide a thermoplastic polymer composition which is flexible and capable of melt-molding and has excellent heat resistance, chemical resistance and oil resistance. Another object of the present invention is to provide a molded article, a laminated article, a hose for industrial use, a tube for industrial use, a fuel hose and a fuel tube comprising the thermoplastic polymer composition. Further object of the present invention is to provide a process for preparing a thermoplastic polymer composition.

Abstract: Interpolymer resin particles comprised of 20% to 60% by weight of uncross-linked polyolefin e.g. polyethylene, polypropylene, and from 40% to 80% by weight based on the weight of the particles of a vinyl aromatic monomer, e.g. styrene, that is polymerized in a suspension process to form an interpenetrating network of polyolefin with polymerized vinyl aromatic monomer particles and having a gel content of 0 to 1.5% by weight based on the weight of the particles for improved processability in end-use applications and improved ESCR properties. The interpolymer resin particles have a VICAT softening temperature from about 90° C. to about 115° C., and a melt index from 0.2 to 35.0 g/10 minutes (Condition G). The particles can be mixed with a blowing agent to form extruded foam articles, such as foam board, and can be used in extrusion, injection molding, rotomolding, and thermoforming processes to form a layer, e.g.

Abstract: A cyclic olefin resin composition which includes (A) 35 to 85 parts by weight of a cyclic olefin polymer having a glass transition temperature of 60 to 200° C., (B) 10 to 60 parts by weight of a flexible copolymer, prepared by polymerizing at least two monomers selected from the group consisting of an olefin compound, a diene compound and an aromatic vinyl hydrocarbon compound, and having a glass transition temperature of 0° C. or below, and (C) 5 to 55 parts by weight of a modified polyolefin. The cyclic olefin resin composition further includes, based on 100 parts by weight of total amount of the components (A), (B) and (C), (D) 0.01 to 5 parts by weight of a radical initiator and (E) 0 to 5 parts by weight of a polyfunctional compound having in its molecule two or more radically polymerizable functional groups. The composition can be used as a material for a substrate having low permittivity, low dielectric tangent, low water absorbability, and excellent heat resistance.

Abstract: Golf ball components, such as cores, intermediate layers, and covers, formed with compositions including polyacrylate elastomers cured with peroxide systems, amine-based systems, or a combination thereof.

Abstract: A golf ball comprising a core, an outer cover layer, and, optionally, an intermediate layer disposed between the core and the outer cover layer is provided. The core, intermediate layer, or cover layer includes a composition formed from a base polymer blend, a crosslink initiator, and at least one additive. The outer cover layer may comprise a polyurethane or polyurea composition. The base polymer blend preferably includes two or more rubber materials. The additive has at least one C—O—B linkage, the carbon in the linkage being a secondary or tertiary carbon and is selected from the group consisting of boranes, borates, boronates, borinates, heterocylic compounds having at least one boron atom as a ring member, boron-containing organosulfides, salts of such additives, and metal salts, organometallic salts, and non-metal salts of boron complexes.

Abstract: The invention provides a molded polymer material which is obtained by subjecting a polymer composition that includes (A) at least one polymer containing ?,?-ethylenically unsaturated carboxylic acid, (B) at least one diene polymer, (C) at least one metal cation source, and (D) at least one organic peroxide, and has a chemical structure arrived at by neutralizing some or all of the carboxyl groups in component A with component C in the presence of component B, to molding and crosslinking under the influence of radicals generated by decomposing component D. The molded polymer material has a high resilience, a high hardness and a good durability, making it well-suited for use in golf balls.

Abstract: A method of preparing a thermoplastic vulcanizate, the method comprising continuously dynamically vulcanizing a rubber within a blend with a thermoplastic resin, where the dynamic vulcanization is effected with a cure system that includes a free-radical cure agent, and a coagent-wetted carrier where the coagent-wetted carrier includes a multi-functional acrylate coagent, a multi-functional methacrylate coagent, or both a multi-functional acrylate and multi-functional methacrylate coagent.

Abstract: Object: To provide fluororubber compositions and crosslinked fluororubber products that are suitable for use as rotary shaft seals, in which each of the initial characteristics, i.e., torque reduction (reduced friction) and sealing properties attributed to reduced oil leakage (oil pump rate when the seal member slides), can be improved, and degradation of these characteristics can be inhibited even after frictional abrasion. Solution Means: A fluororubber composition obtained by blending a polyol crosslinking agent into a fluororubber polymer including 70 to 90 wt % of a polyol-crosslinkable fluororubber polymer (A) and 30 to 10 wt % of a peroxide-crosslinkable fluororubber polymer (B); and a fluororubber composition obtained by blending a polyol crosslinking agent and a peroxide crosslinking agent into a fluororubber polymer including 40 to 90 wt % of a polyol-crosslinkable fluororubber polymer (A) and 60 to 10 wt % of a peroxide-crosslinkable fluororubber polymer (B).

Abstract: The present invention provides a curable composition which can yield a fluorinated cured product excellent in transparency, light resistance, heat resistance, and mechanical strength, and minimally damaged by stress concentration. The invention relates to a curable composition comprising a perfluoro polymer (a) containing a unit derived from a perfluorodiene having two polymerizable carbon-carbon double bonds, wherein two carbon atoms in one carbon-carbon double bond form the main chain, and the other carbon-carbon double bond forms a side chain; a perfluorocyclic monoene (b) having at least 8 carbon atoms, which has an alicyclic structure made of carbon atoms and optionally containing an oxygen atom, and one polymerizable carbon-carbon double bond, wherein at least one of two carbon atoms forming the carbon-carbon double bond is a carbon atom constituting the alicyclic structure; and a polymerization initiator (i).

Abstract: The composition and the preparation of a chain-extending concentrate for production of foamed cellular materials of aromatic polyesters is disclosed in this invention. The chain-extending concentrate includes an ethylene-acrylate copolymer, a high-temperature thermoplastic and a multifunctional compound. The preparation process includes two steps: 1) Mixing and melt blending the multifunctional compound and the HT thermoplastic resin into the matrix of the ethylene-acrylate copolymer in an internal mixer and 2) extrusion of the mixture at a temperature below the melting point or reaction temperature of the multifunctional compound.

Abstract: The present invention provides natural rubber latex in which glucans being polysaccharides contained in the latex are decomposed by treating the natural rubber latex with an ?- and/or ?-glucan decomposing enzyme such as amylase and cellulose and in which non-rubber components are subjected to suited enzyme treatment, and it provides natural rubber which is maintained in physical properties such as revelation of strain induced crystallization, an accelerating effect, an antioxidant effect and a vulcanization-accelerating effect and which is improved particularly in an abrasion resistance and a low hysteresis loss property, a production process for the same and a rubber composition and a tire using such natural rubber.

Abstract: A thermoplastic elastomer composition which has excellent cleanability and is suitable for use as a medical rubber supply. It is characterized by comprising a rubber ingredient dynamically crosslinked with a crosslinking agent and a matrix which comprises a thermoplastic resin and in which the crosslinked rubber ingredient has been dispersed, the crosslinking agent comprising a triazine derivative.

Abstract: A method of preparing a thermoplastic vulcanizate, the method comprising dynamically vulcanizing a rubber within a blend with a thermoplastic resin, where the dynamic vulcanization is effected with a cure system that includes a free-radical cure agent and triallyl isocyanurate.

Abstract: Thermoplastic vulcanizate elastomer obtained by dynamic vulcanization of a heterophasic polyolefin composition in presence of at least (i) an alkenyl-substituted alkoxysilane grafting agent and (ii) water; wherein said heterophasic polyolefin composition has flexural modulus equal to or lower than 150 MPa, and comprises: (a) a crystalline propylene homopolymer or copolymer of propylene with up to 15% of ethylene or other alpha-olefin comonomer(s), or their combinations, and (b) a copolymer or a composition of copolymers of ethylene with other alpha-olefins, containing from 15% to 40% of ethylene, said thermoplastic vulcanizate elastomer having compression set values in the range from 45-65%, the ratio of elongation at break to compression set values over 10 and hardness shore A values below 90.

Abstract: A power transmission belt having a body with a length, an inside, an outside, and laterally spaced side surfaces. The body has a first rubber composition that includes an organic peroxide used as a cross-linking agent and N,N?-m-phenylenedimaleimide and/or quinone dioxime in an amount of 0.5 to 13 parts by weight per 100 parts by weight of rubber components. The rubber components include (a) ethylene-vinyl ester copolymer and/or an ethylene-?,?-unsaturated carboxylate copolymer, and (b) an ethylene ?-olefin rubber in a ratio of from 5:95 to 100:0 by weight.

Abstract: The invention provides a thermoplastic elastomer composition comprising: (a) 100 parts by weight of a hydrogenated block copolymer; (b) 0.01 to 3 parts by weight of an organic peroxide; and (c) 1 to 80 parts by weight of a carboxylated liquid polybutadiene. Also disclosed is a thermoplastic resin composition comprising the thermoplastic elastomer composition.

Abstract: A thermoplastic elastomer composition containing a dynamically cross-linked composition of (A) 10 to 70 parts by weight of a thermoplastic resin, (B) 30 to 90 parts by weight of a modified butyl rubber composition containing a modified butyl rubber modified reacting, to butyl rubber, (a) a compound containing, in the molecule thereof, a nitroxide free radical stable at ah ordinary temperature in the presence of oxygen, and (c) a bifunctional or higher functional radical polymerizable monomer, and (C) 0.01 to 15 parts by weight of a cross-linking agent.

Abstract: The present invention is directed to the incorporation of functionalized polyethylenes, in amount of about 1% to 95% by weight based upon the weight of the total crosslinkable material, into ethylene alpha olefin elastomers, such as EPDM elastomer compositions, which are crosslinked by peroxides, which results in improved properties, such as hardness and modulus of elongation, and can result in improved higher abrasion resistance, wear resistance, coefficient of friction, tensile strength, and other properties through a broad temperature range, which are beneficial to power transmission products, such as power transmission belts.

Abstract: A resin modifier (C) obtained by reacting a polyolefin (A) having a group which reacts with a carbodiimide group, and a carbodiimide group-containing compound (B), wherein the content of the carbodiimide group is from 1 to 200 mmol per 100 g of the resin modifier, and a polar group-containing polymer composition (F) comprising from 1 to 30% by weight of the resin modifier (C), from 99 to 20% by weight of a polar group-containing polymer (D), and from 0 to 80% by weight of an olefin polymer (E). The modifier can provide improved low-temperature impact resistance of a polymer alloy including a polar group-containing polymer and an olefin polymer (such as polylactic acid and polypropylene), and can provide a molded article with smooth surface when the polymer alloy is molded. A polar group-containing polymer composition is also set forth.

Abstract: A blend of ethylene homopolymers contains at least one blend component having a very low molecular weight and a narrow molecular weight distribution. The blend has surprisingly high density and low hexane extractables. The blend is suitable for the manufacture of a wide variety of plastic goods including extruded goods and molded goods. Plastic film prepared from the blends of this invention have a low Water Vapor Transmission Rate (“WVTR”).

Abstract: The invention relates to a process for the preparation of a block copolymer comprising a sequence successively comprising a semicrystalline and/or hydrolysable block, an elastomeric block and an amorphous block, comprising the following stages: a) a stage of 1,2-addition, to a terminal ethylenic group of a semicrystalline and/or hydrolysable polymer, of an alkoxyamine which can correspond to the following formula (II): b) a stage of addition, to the medium resulting from stage a), of one or more monomers which are precursors of the elastomeric block, in return for which a semicrystalline and/or hydrolysable block-b-elastomeric block diblock copolymer is obtained; c) a stage of addition, to the medium resulting from stage b), of one or more monomers which are precursors of the amorphous block, in return for which the semicrystalline and/or hydrolysable block-b-elastomeric block-b-amorphous block triblock copolymer is obtained.

Abstract: An adhesive of the present invention is used for polarizing plate to provide a transparent protective film on at least one side of a polarizer and comprises a resin solution comprising a polyvinyl alcohol-based resin, a crosslinking agent and a leveling agent containing an acetylene skeleton-containing compound, wherein 0.01 to 10 parts by weight of the leveling agent is added to 100 parts by weight of the polyvinyl alcohol-based resin. The adhesive for polarizing plate can provide a satisfactory wettability when applied to transparent protective films and allows the production of polarizing plates to have water resistance at high temperature and satisfactory optical properties.

Abstract: The present invention provides a (meth)acrylic resin composition comprising a carboxylic acid group produced by heating a (meth)acrylic-based resin (C), wherein the (meth)acrylic-based resin (C) is obtained by polymerizing a monomer mixture (A) containing 80 to 99 wt % of a linear alkyl (meth)acrylate and 1 to 20 wt % of tertiary-butyl(meth)acrylate, in the presence of an acrylic acid ester-based crosslinked elastic particle (B) that is obtained by mixing and polymerizing 0.5 to 5 parts by weight of a polyfunctional monomer having at least two non-conjugated double bonds per molecule, with respect to 100 parts by weight of a monomer mixture containing 50 to 100 wt % of an alkyl acrylate monomer and 0 to 50 wt % of an alkyl methacrylate monomer. This composition can be used to produce a film having excellent chemical resistance (in particular, sun-screening agent resistance).

Abstract: The invention relates to a polar group functionalized copolymer useful to prepare a nanocomposite polymer and to the nanocomposite polymer, wherein the polar group functionalized copolymer useful to prepare a nanocomposite polymer and the nanocomposite polymer are as defined in the specification.

Abstract: A pre-expanded beads of olefin-modified polystyrene-based resin comprising a pie-expanded beads of a polystyrene-based resin modified with a polyolefin-based resin, wherein a styrene-based monomer forming a polystyrene-based resin in the beads is used in the range of 100 to 1,000 parts by weight relative to 100 parts by weight of a polyolefin-based resin, a bulk density of each bead is 0.012 to 0.20 g/cm3, and an absorbance ratio at 698 cm?1 and 2850 cm?1 (D698/D2850) obtained from an infrared absorption spectrum of each bead surface measured by ATR method infrared spectroscopy is in the range of 0.1 to 2.5.

Abstract: The invention relates to a process and an apparatus for the preparation of a crosslinkable rubber mixture for vehicle tyres, lines, drive belts and other industrial rubber articles, which can be carried out at least semicontinuously. The present invention is based on the discovery that the experiments known from the prior art to carry out the batchwise process usually used at least partly continuously have failed in particular because of the problem that the crosslinking agents have to be mixed rapidly and homogeneously with the base mixture, also referred to as rubber base mixture, without the mixture consisting of the base mixture and the crosslinking agents heating up too strongly. According to the invention, attention was therefore focussed on reliably mixing the base mixture homogeneously with the crosslinking agents and minimizing the mixing time. A first measure for achieving the desired aim consists in first mixing the crosslinking agents with one another before they are mixed with the base mixture.

Abstract: A polymeric composition having improved melt extrusion properties comprising: A) an olefin polymer; B) a catalyst neutralizer comprising a cationic derivative of a poly(oxyalkylene) compound; and C) a processing additive composition comprising a fluoropolymer and optionally, an interfacial agent.

Abstract: Novel stabilizers that are comprised of known polymer additive moieties chemically bound to hyperbranched and/or dendritic polymers or copolymers, and novel stabilizers comprised of known polymer additive moieties chemically bound to amphiphilic copolymers exhibit superior permanence in an organic substrate as well as high surface affinity.

Abstract: A method for producing a polymer blend that includes: combining a first polymer, a second polymer and an organoclay to form a mixture, wherein the first polymer is not compatible with the second polymer, and heating the polymer and organoclay mixture to form a compatilized polymer blend. The preferred organoclay is montmorillonite clay functionalized by an intercalation agent. The intercalation agent is a reaction product of a polyamine and an alkyl halide in a polar solvent.

Abstract: The present invention is directed to a method of preparing a functionalized elastomer, comprising the steps of A) obtaining a diene-based elastomer; B) mixing the diene-based elastomer with a halogenating agent to form an intermediate elastomer; and C) mixing the intermediate elastomer with a dienophile comprising a filler-active functional group to form a functionalized elastomer.

Abstract: The present invention relates to a block copolymer prepared by ATRP, wherein the polymer chain terminal group is structurally modified with the functionally effective group of a lubricant or polymer additive selected from the group consisting of antioxidants, metal deactivators, antiwear and extreme pressure additives and corrosion inhibitors. The invention also relates to a composition comprising the structurally modified block copolymer and a composition of matter subject to oxidative, thermal or light induced degradation, such as lubricants or polymers.

Abstract: Process for cross-linking ethylene-?-olefin copolymers comprising the step of combining the copolymer with (a) an initiator capable of generating free radicals and (b) a sulfur-containing co-agent according to formula R—Y—Sx—Y—R. This process results in cross-linked copolymers with improved dynamic properties, tensile strength, delta torque, and/or modulus, without compromising on compression set or aging stability.

Abstract: A thermoplastic vulcanizate comprising of a dynamically-cured rubber; and a thermoplastic phase, where the thermoplastic phase includes fiber and the reaction product of a methylene donor and a methylene acceptor. The thermoplastic phase could include a functionalized thermoplastic resin.

Abstract: A method for making storage-stable glyoxalated inter-copolymers with higher and adjustable charge density suitable for use as a strengthening agent for paper. The glyoxalated inter-copolymers can be used to enhance the strength of paper, particularly recycled paper and mechanical printing paper.

Abstract: The invention relates to hydroxylamine esters and polymerizable compositions comprising these hydroxylamine esters and an ethylenically unsaturated monomer or oligomer and methods for achieving a controlled increase in the molecular weight of polyethylene.

Abstract: An object of the present invention is to provide a thermoplastic polymer composition which is flexible and capable of melt-molding and has excellent heat resistance and chemical resistance. Further object of the present invention is to provide a molded article, a sealing material, peripheral parts of fuel system, a fuel hose and a fuel container comprising the thermoplastic polymer composition. The present invention relates to a thermoplastic polymer composition comprising a fluororesin (A) containing a fluorine-containing ethylenic polymer (a), a crosslinked fluororubber (B) in which at least a part of at least one kind of fluororubber (b) is crosslinked, and a fluorine-containing thermoplastic elastomer (C).

Abstract: A polypropylene resin composition comprising (A) 99.8 to 80 weight parts of a polypropylene resin having a melt flow rate of 0.1 to 50 g/10 min and (B) 0.2 to 20 weight parts of an olefin copolymer rubber having an intrinsic viscosity [?] of 0.5 to 4.0 dl/g and/or a polyethylene resin having a density of 0.895 to 0.945 g/cc and a melt flow rate of 0.05 to 15 g/10 min, which have undergone an ionization ray-irradiation treatment and/or a treatment of adding 0.05 to 5 weight parts of an organic peroxide to 100 weight parts of the aforesaid polypropylene resin composition comprising (A) and (B) and then melting.

Abstract: In accordance with the present invention, compositions are described which are useful, for example, for the preparation of metal-clad laminate structures, methods for the preparation thereof, and various uses therefor. Invention metal-clad laminate structures are useful, for example, multi-layer board (MLB) industry, in the preparation of burn-in test boards and high reliability boards, applications where low coefficient of thermal expansion (CTE) is beneficial, in the preparation of boards used in down-hole drilling, and the like.

Abstract: The present invention relates to a controlled radical grafting process of a polyolefin derived from monomeric units including ?-olefins. This process comprises the reaction of the polyolefin and at least one radical reaction initiator with a grafting system which comprises at least one grafting compound having an electron donator heterocyclic aromatic ring conjugated to at least one —HC?CR1R2 group in which at least one of R1 and R2 is an electron acceptor functional group. The process can be performed continuously in an extruder or discontinuously in a mechanical mixer.

Abstract: The present invention provides a thermoplastic elastomer composition, a composite molded body and a weather strip. The thermoplastic elastomer composition comprises the following (i) and (ii): (i) a thermoplastic elastomer obtained by dynamically crosslinking (a), (b), (c) and (d) in the presence of a crosslinking agent,(a) 10 to 75% by weight of the ethylene-a-olefin copolymer rubber; (b) 10 to 50% by weight of a propylene resin; (c) 5 to 60% by weight of mineral oil; and (d) an ethylene resin; a total content of (a), (b) and (c) being 100% by weight, and a content of (d) being from 0 to 10 parts by weight, provided that the total content of (a), (b) and (C) is 100 parts by weight; (ii) a high density polyethylene; and a content of (ii) is from 55 to 150 parts by weight based on 100 parts by weight of (a) the ethylene-?-olefin copolymer rubber.

Abstract: It is an object of the invention to provide a carbodiimide modified polyolefin adhesive having excellent adhesive strength in a room temperature atmosphere and excellent adhesive strength in a high temperature atmosphere even in continuously molding with a practical molding machine. An adhesive (D), i.e., a carbodiimide modified polyolefin adhesive of the present invention which can solve the above problem is obtainable by allowing a polyolefin (A) having a group capable of reacting with a carbodiimide group to react with a carbodiimide group-containing compound (B) in the presence of an unmodified polyolefin (C) and having a ratio of a peak intensity at 2130 to 2140 cm?1 to a peak intensity at 1470 cm?1, as determined by infrared absorbance analysis, of not more than 60% and a density of 0.870 g/cm3 to 0.920 g/cm3.

Abstract: Disclosed is a thermoplastic elastomer composition comprising 100 parts by weight of EPDM rubber, 5-1,000 parts by weight of styrenic thermoplastic elastomer, 50-3,000 parts by weight of paraffin oil, 10-200 parts by weight of a polyolefin resin as a curative, 1-15 parts by weight of a phenolic resin, and 0.5-5 parts by weight of a curing activator. The composition is superior in flowability, mechanical properties and oil resistance as well as being low in hardness, so that it can be applied for automobile parts.

Abstract: In at least one embodiment, a particulate water-absorbing agent is provided which not only ensures the many conventional physical properties (absorption rate, centrifuge retention capacity, absorbency against pressure, particle size distribution etc.) but also prevents odor which is generated after the resin is swollen by absorption. The water absorbent agent of an embodiment of the present invention therefore does not cause odor in actual use. As a result of intensive study of the foregoing problem, an embodiment of the present invention offers a way of controlling a specific odor component, which is generated from impurities and/or by-product derived from the raw material, after the high temperature process. In this way, an embodiment of the present invention successfully provides a water absorbent agent not causing odor after the resin is swollen by absorption.