Abstract: A polyaniline-containing composition containing a polyaniline component and an emulsion polymer, wherein the emulsion polymer is obtained by caring out emulsion polymerization of a monomer mixture containing a monomer of formula (1): wherein R1 is a hydrogen atom or a methyl group; and R2 and R3 each independently is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, and an aryl group having 6 to 20 carbon atoms; or R2 and R3 are combined to form an alkylene group having 1 to 12 carbon atoms or an oxyalkylene group having 1 to 12 carbon atoms, in an amount of not smaller than 15% by mass, relative to a total amount of monomers; and a process for its production.

Abstract: The present invention relates to a continuous, multicellular, hollow carbon fiber wherein the fiber structure includes a substantially hollow fiber and multiple internal walls defining multiple integral internal hollow fibers such that the fiber structure comprises a honeycomb-like cross section.

Abstract: Composition containing, based in each case on its total weight, A) 50.0% by weight to 99.5% by weight of at least one (meth)acrylate (co)polymer and B) 0.5% by weight to 50.0% by weight of at least one copolymer obtainable by polymerisation of a monomer mixture comprising i. 70% by weight to 92% by weight of a vinylaromatic monomer and ii. 8% by weight to 30% by weight of acrylonitrile or methacrylonitrile or mixtures thereof and iii. 0% by weight to 22% by weight of at least one further monomer, the composition having a haze according to ASTM D1003 of less than 2.0% at 23° C. and a haze according to ASTM D1003 of less than 4.0% at 40° C. and the composition containing at least one (meth)acrylate (co)polymer a) having a solution viscosity in chloroform at 25° C. (ISO 1628—part 6) of greater than 55 ml/g. The mouldings obtainable from the composition are distinguished in particular by improved stress cracking resistance and are suitable in particular for coverings, finishes or films.

Abstract: A composition comprises, from 5 to 90 wt. % of a modified poly(butylene terephthalate) copolymer, wherein (i) the modified poly(butylene terephthalate) copolymer is derived from a first polymer comprising a poly(ethylene terephthalate) component selected from the group consisting of poly(ethylene terephthalate) homopolymers, poly(ethylene terephthalate) copolymers, and combinations thereof, in the presence of a second polymer selected from the group consisting of polyvinyl chlorides, polyvinylidene chlorides, polyamides, polylactic acid, and combinations thereof, and wherein (ii) the modified poly(butylene terephthalate) copolymer comprises at least one poly(ethylene terephthalate) component residue and a member selected from the group consisting of a second polymer selected from the group consisting of polyvinyl chlorides, polyvinylidene chlorides, polyamides, polylactic acid, and combinations thereof at least one residue derived from the second polymer, and combinations thereof; from 5 to 90 wt.

Abstract: Chemically crosslinked polycyclooctene having excellent shape recovery properties is prepared by ring-opening metathesis polymerization of cis-cyclooctene followed by chemical crosslinking. The crosslinked polycyclooctene can be shaped, the shape memorized, a new shape imparted with the original shape being recoverable by suitable temperature adjustment. The dependence of shape memory characteristics on degree of crosslinking was established. In addition to polycyclooctene, blends thereof with other materials such as SBR, EVA, polyurethane rubbers, and inorganic fillers can be utilized to provide chemically crosslinked products having excellent and tailored shape memory properties.

Abstract: A resin composition is provided which comprises 10 to 88% by mass of a propylene-based polymer (A) composed of 30 to 70% by mass of a propylene-based polymer (a) having a melt flow rate of 0.1 to 17 g/10 minutes measured at a temperature of 230° C. and a load of 21.18N and 30 to 70% by mass of a propylene-based polymer (b) having a melt flow rate of 80 to 300 g/10 minutes measured at a temperature of 230° C. and a load of 21.18N; 10 to 88% by mass of a polylactic acid-based resin (B); 1 to 50% by mass of an ethylene-based polymer having an epoxy group (C); and 1 to 50% by mass of an elastomer (D).

Abstract: The present invention provides a resin composition excellent in strength, impact resistance, heat resistance and moldability and further, of low environmental load capable of decreasing CO2 exhaustion in its production. The present invention is a resin composition comprising a styrene-based resin (A), an aliphatic polyester (B) and at least one species selected from a compatibilizer (C) and a dicarboxylic anhydride (D), and the compatibilizer is preferably at least one species described below.

Abstract: The present invention is directed to a substantially pigment-free coating composition with good cure response and improved appearance. In particular, the substantially pigment-free coating composition may comprise (a) at least one functional polymer containing amine groups and groups selected from hydroxyl and carbamate; and (b) a crosslinking agent.

Abstract: Use of a material comprising a first polylactic acid and a first non-polylactic acid polyester as a filter base material (2) for a fluid cleaning filter. Furthermore, a method for fabricating a filter base material (2) as well as a filter base material (2) obtainable by the method and a filter comprising the filter base material (2) are provided.

Abstract: The present invention provide a heat-shrinkable film consisting of a layer or comprising at least one layer, wherein the layer is made of a mixed resin containing a polylactic acid resin and a polyolefin resin as the main components, wherein mass ratio of the polylactic acid resin and the polyolefin resin is 95/5 to 50/50 by mass, the polylactic acid resin being a copolymer of D-lactic acid and L-lactic acid or a mixed resin of the copolymer, wherein D/L ratio of D-lactic acid and L-lactic acid is 3/97 to 15/85 or 85/15 to 97/3, the storage elastic modulus (E?) of the polyolefin resin or the soft acrylic resin at 20 degree C. being 100 MPa or less as measured at an oscillation frequency of 10 Hz and a strain of 0.1%, the film being stretched in at least one direction, and the heat shrinkage ratio of the film in the main shrinking direction being 20% or more as measured after the film is immersed in hot water of 80 degree C. for 10 seconds.

Abstract: The present invention relates to novel coating compositions comprising polyisocyanates, aliphatic oligocarbonate polyols, oligoester polyols and polyacrylate polyols, to a process for their production and to their use in the production of coatings.

Abstract: The present invention provides a polyolefin/polyester-based reflective film having a high reflectivity and a reflective sheet for backlight comprising the reflective film, wherein the reflective film is produced by forming a resin composition that contains 100 parts by mass of a polyolefin component (A) comprising a polyolefin with stereospecificity and a modified polypropylene and from 40 to 240 parts by mass of a biodegradable polyester component (B), into a film followed by stretching it, and wherein the reflective film requires neither addition of a filler to the starting resin composition nor provision of a reflective coating layer on the surface of the resulting film for the purpose of imparting optical properties such as reflectivity to the film.

Abstract: This invention provides an adhesive resin having sufficient adhesion with a polar resin in any applications at normal temperature and applications for boiling and retort processing, a resin composition comprising the adhesive resin, and further a laminate with polyolefin/polar resin including the resin composition as an intermediate layer. An adhesive resin composition (A) for a polar resin is produced by mixing a resin having a carboxylic acid anhydride or derivative thereof component (a1) with a ring-opening polymer or condensation polymer component (a2) having a hydroxyl group or an amino group at both ends or at one end; or graft-reacting the (a2) component with the (a1) component, and wherein an amount of the (a1) component is such that an acid value of the adhesive resin composition (A) is from 0.

Abstract: The present invention relates to a polylactic acid with improved impact strength, comprising, by weight: 60% to 97% of polylactic acid (PLA), and 3% to 40% of a mixture of compounds A and B in which: A is a copolymer of ethylene and of an unsaturated monomer bearing at least one epoxide or carboxylic acid or carboxylic acid anhydride function, and optionally of alkyl (meth)acrylate, B is a copolymer of ethylene and of alkyl (meth)acrylate, said mixture having a weight % (A)/weight % (A+B) ratio of between 0.10 and 0.49. The present invention also relates to the manufacture of components or objects from these compositions.

Abstract: A melt-mixed composition of non-melt flowable polytetrafluoroethylene (PTFE) and melt-fabricable perfluoropolymer is provided that exhibits thixotropy at increasing shear rate in the molten state and high elongation at break even at PTFE concentrations well above 4 wt %, based on the combined weight of the PTFE and the perfluoropolymer, e.g. at least 200% up to at least 30 wt % PTFE, the composition also exhibiting the structure of a dispersion of submicrometer-size particles of the PTFE in a continuous phase of the melt-fabricable perfluoropolymer.

Abstract: A composite yarn comprising an ultra-high-molecular-weight-polyethylene filament and an additional synthetic resin filament, at least a part of which comprises a light storage agent. The composite yarn has both visibility in a dark place and properties necessary for a fishing line or other yarns made of an ultra high molecular weight polyethylene filament.

Abstract: A polyamide resin composition, having an excellent extensibility and flexing fatigue, composed of a polyamide resin (A), as a matrix, and a modifying polymer (C), dispersed therein, having a functional group (B) reactive with the polyamide resin (A), wherein a tensile stress at break of the modifying polymer (C) is 30 to 70% of the tensile stress at break of the polyamide resin (A), and a tensile elongation at break of the modifying polymer (C) is 100 to 500% of the tensile elongation at break of the polyamide resin (A) as well as a pneumatic tire and hose using the same.

Abstract: The invention provides a crystalline polyamide-type resin composition comprises (a) a crystalline polyamide resin composition comprising (i) 50 to 90% by weight of crystalline polyamide resin (A) having a relative viscosity in 96% sulfuric acid of not less than 3.5 and (ii) 50 to 10% by weight of a crystalline polyamide resin (B) having a melting point lower than the melting point of polyamide resin (A) by 20° C. or more and a relative viscosity dissolved in 96% sulfuric acid of not more than 3.6, and (b) 1 to 10 part(s) by weight of a modified polyolefin resin (C) having a reactive functional group being able to react with the terminal group and/or main-chain amide group of the polyamide resin. The invention also provides a door checker for automobiles prepared from the crystalline polyamide-type resin composition.

Abstract: Pressure sensitive adhesive formulations of an acrylic polymer grafted with a macromer are particularly well suited for use in the manufacture of impact resistant articles such as impact resistant glass laminates and products comprising such laminates.

Abstract: Disclosed are ionomer compositions neutralized by a combination of cesium and potassium that have antistatic properties. Also disclosed are articles, including laminates and monolayer or multilayer structures comprising such compositions to which neither powders nor dusts easily adhere electrostatically.

Abstract: The present invention relates to a transferring film for manufacturing a decorative laminate sheet having an excellent weatherability, scratch resistance and moldability, a laminate sheet manufactured therefrom and a method for manufacturing thereof. The transferring film and the laminate sheet of the present invention combine an excellent scratch resistance and thermo-formability, since a surface treatment layer comprising a modified acrylic resin and vinyl acetate is formed thereon, and thus may be effectively applied to protect and decorate plastic molded articles such as household appliances, furniture and automobile parts, especially, molded articles having a three-dimensional complicated shape.

Abstract: Ethylene-vinyl alcohol copolymers have superior gas barrier properties, but are inferior in bending fatigue resistance. The present invention improves bending fatigue resistance without reducing the gas barrier property and heat resistance. An ethylene-vinyl alcohol copolymer having an ethylene content of 20 to 50 percent by mole is modified by incorporating 0.01 to 1% mol of a structural unit expressed by the following formula (3): wherein, n indicates an integer of 2 to 5, m indicates an integer of 10 to 20, and R1 indicates a C1 to C20 aliphatic hydrocarbon group provided that R1 may contain a mercapto group, thioester group, sulfenamide, vinyl group, methacryloxy group, or acryloxy group. The modified ethylene vinyl alcohol copolymer may be used as a gas barrier resin and this gas barrier resin may be shaped or laminated and used in various applications such as in pneumatic tires and hoses.

Abstract: A method for forming a biodegradable polylactic acid suitable for use in fibers is provided. Specifically, a polylactic acid is melt processed at a controlled water content to initiate a hydrolysis reaction. Without intending to be limited by theory, it is believed that the hydroxyl groups present in water are capable of attacking the ester linkage of polylactic acids, thereby leading to chain scission or “depolymerization” of the polylactic acid molecule into one or more shorter ester chains. The shorter chains may include polylactic acids, as well as minor portions of lactic acid monomers or oligomers, and combinations of any of the foregoing. By selectively controlling the hydrolysis conditions (e.g., moisture and polymer concentrations, temperature, shear rate, etc.), a hydrolytically degraded polylactic acid may be achieved that has a molecular weight lower than the starting polymer.

Abstract: The present invention is directed to a non-gelled, curable composition including at least one compound having a plurality of imide functional groups. The compound in particular contains a reaction product of at least one secondary monoamine and at least one maleimide, and is suitable for use in coatings and castings.

Abstract: The invention relates to a blend of one or more biopolymers with one or more acrylic copolymers, for the purpose of improving the properties of the biopolymer(s). The biopolymer composition comprises 85-99.9 weight percent of biopolymer(s) and 0.1 to 15 weight percent of one or more acrylic copolymers.

Abstract: Provided is thermosetting urea-formaldehyde (UF) resin binder formulation, preferably prepared with modified styrene-maleic anhydride. The formulation has a viscosity in the range of from 3 to 10 cP and a surface tension of from 35 to 50 mN/m, and is prepared using a UF resin composition exhibiting a viscosity of from 175 to 250 cP.

Abstract: The present invention relates to a resin composition for an optical film, comprising a polyarylate resin and an amino resin having a triazine structure, and to an optical film prepared by using the same. By using the resin composition for an optical film, a thickness direction retardation can be controlled, while having a negative value, during a step of fabricating the optical film, an in-plane retardation can be controlled, and the optical film can be used as a substrate of a display instead of a glass substrate without an additional retardation compensation film.

Abstract: The invention relates to polyester compositions comprising a) a poly(cyclohexylene-dimethylene)terephthalate (PCT) resin, b) at least one copolyester elastomer and c) at least three ethylene copolymers chosen among c1) one or more ethylene alkyl-(meth)acrylate copolymers; c2) one or more ethylene acid copolymers and/or ionomers thereof; and c3) one or more ethylene epoxide copolymers. The disclosed polyester compositions are particularly well suited for manufacturing articles that maintain good mechanical properties against long-term high temperature exposure, i.e. for high temperature applications.

Abstract: Disclosed is a resin composition including a polylactic acid resin (A), a polycarbonate resin (B) and a methyl methacrylate copolymer (C). The mass ratio (A/B) between the resins (A) and (B) is 40/60 to 80/20. The ratio (MFRA/MFRB) between the melt flow rate (MFRA) of the resin (A) and the melt flow rate (MFRB) of the resin (B) is less than 10 at 240° C. under a load of 21.2 N. The copolymer (C) is a copolymer between methyl methacrylate and a (meth)acrylic acid ester, and the weight average molecular weight (Mw) of the copolymer (C) is 500,000 or more. The content of the copolymer (C) is 0.

Abstract: An object of the present invention is to provide: a thermoplastic elastomer composition, which is accompanied by less environmental burden, and which has flexibility, rubber elasticity, formability and recyclability; and a molded product obtained using the same. The present invention is directed to a thermoplastic elastomer composition comprising a thermoplastic resin (A) derived from a non-petroleum source, and at least one rubber (B) selected from a natural rubber, a diene polymer rubber, an olefin polymer rubber, an acrylic rubber and a silicone rubber, the thermoplastic elastomer composition being obtained by allowing the rubber (B) to be dynamically crosslinked with a crosslinking agent (C) in the presence of the thermoplastic resin (A). Preferred (A) is a polylactic acid, or a poly(3-hydroxybutyrate), and preferred (B) is a natural rubber.

Abstract: A styrenic thermoplastic resin composition of the present invention comprises about 100 parts by weight of base resin comprising (A) about 10 to about 99 parts by weight of styrenic resin containing an epoxy group and (B) about 1 to about 90 parts by weight of polyester resin; and (C) about 0.1 to about 97 parts by weight of amorphous modified polyester resin, based on the total weight of the base resin. A molded article produced from the styrenic thermoplastic resin composition of the present invention can have excellent impact resistance and paintability.

Abstract: A biaxially oriented laminate film including a core layer including a blend of crystalline polylactic acid polymer and a minority amount of polyolefin with a compatibilizing resin which is biaxially oriented such that a matte or opaque appearance is obtained. The laminate film may further have additional layers such as a heat sealable layer disposed on one side of the core layer including an amorphous polylactic acid resin and/or a polylactic acid resin-containing layer disposed on the side of the core layer opposite the heat sealable layer, a metal layer, or combinations thereof.

Abstract: A resin composition includes a biodegradable resin (A), a polyolefin resin (B) and a dispersing agent (C), which has a sea-isle structure in which the biodegradable resin (A) is dispersed as isles in the polyolefin resin (B) existing as a sea component wherein the average dispersed particle size of the biodegradable resin (A) is 1 nm to 1000 nm.

Abstract: The present invention is directed to a golf ball having at least one layer which includes a polymer composition containing at least 50 wt % of an acid polymer and at least 0.5 wt % of a polylactic acid, wherein the weight percentages are based on the total polymeric weight of the polymer composition. At least 70% of the acid groups of the acid polymer are neutralized by a cation source or a metal salt thereof.

Abstract: A composition comprising a blend of a polyolefin, polylactic acid, and a reactive modifier. A method of producing an oriented film comprising reactive extrusion compounding a mixture comprising polypropylene, polylactic acid, a reactive modifier to form a compatibilized polymeric blend, casting the compatibilized polymeric blend into a film, and orienting the film. A method of preparing a reactive modifier comprising contacting a polyolefin, a multifunctional acrylate comonomer, and an initiator under conditions suitable for the formation of an epoxy-functionalized polyolefin wherein the epoxy-functionalized polyolefin has a grafting yield of from 0.2 wt. % to 15 wt. %.

Abstract: A multi-component article comprising a first component comprising a biodegradable polymer, and a second component comprising a polyolefin and a reactive modifier. A method of preparing a multi-layer film comprising coextruding first and second film layers, wherein the first layer comprises a polylactic acid and the second layer comprises a polyolefin and an epoxy-functionalized polyolefin. A method of preparing a multi-component fiber comprising coextruding a core component and a sheath component, wherein the core component comprises a polyolefin and an epoxy-functionalized polyolefin and the sheath component comprises a polylactic acid.

Abstract: A film comprising a polylactic acid and polypropylene blend having a haze of from about 10% to about 95% and a gloss 45° of from about 50 to about 125. A method of producing an oriented film comprising blending polypropylene and polylactic acid to form a polymeric blend, forming the polymeric blend into a film, and orienting the film. A method of producing an injection molded article comprising blending polypropylene and polylactic acid to form a polymeric blend, injecting the polymeric blend into a mold, and forming the article.

Abstract: Disclosed is a hollow fiber that includes a hollow positioned at the center of the hollow fiber, macropores positioned at adjacent to the hollow, and mesopores and picopores positioned at adjacent to macropores, and the picopores are three dimensionally connected to each other to form a three dimensional network structure. The hollow fiber includes a polymer derived from polyimide, and the polyimide includes a repeating unit obtained from aromatic diamine including at least one ortho-positioned functional group with respect to an amine group and dianhydride.

Abstract: An amphiphilic copolymer and method for fabricating the same are provided. Further, a polymer composition employing the amphiphilic copolymer is also provided. The amphiphilic copolymer includes a polar block connected to a nonpolar block via a moiety derived from maleic anhydride, wherein the polar block is derived from polylactide, and the nonpolar block is derived from thermoplastic polyolefin elastomer.

Abstract: The invention provides a kind of prepolymer with 4-(N-maleimide phenyl)Ether (MPGE) epoxy resin and 4,4?-diphenylmethane-amino-di-malays polyimide (BMI) as reactants, with free radical initiator leading to reaction in solvents, and adding inhibitor after reaction, with the mole ratio of 0.05-0.5 for BMI and MPGE; the initiator usage is 0.01%-0.15% of mole total for reactant monomers; the solvent usage is 50%-70% of the total weight of the reactants; the inhibitor usage is half to double of mole amount of the initiator used. This kind of prepolymer can be used to produce high-performance thermosetting resin composition corresponding to the packaging requirements for electronic components and Integrated Circuits (IC).

Abstract: The invention pertains to low profile additives (“LPA”) comprising branched polymers having a weight average molecular weight (Mw) of at least about 20,000 grams/mole and a number average molecular weight (Mn) of at least about 3,000 grams/mole and methods for making the LPAs. The invention further concerns compositions comprising LPAs synthesized from one or more difunctional monomers and one or more branching agents. Also, disclosed are thermosettable resinous compositions and molded articles comprising the LPAs.

Abstract: Nanoparticles of a functionalized and crosslinked polyvinylaromatic (PVAr) that may be used as reinforcing filler in a polymeric composition, the PVAr being a copolymer of at least: a vinylaromatic comonomer “A”; a comonomer “B” carrying a functional group denoted by Z of formula ?Si—X, X representing a hydroxyl or hydrolyzable group; a crosslinking comonomer “C” which is at least bifunctional and polymerizable by means of an addition reaction, it being possible for comonomer C to be vinylaromatic, in this case identical or different to comonomer A or non-vinylaromatic. The PVAr comprises, for example, a copolymer of styrene, ethylvinylbenzene, divinylbenzene and trimethoxysilylpropyl(meth)acrylate, being in the form of nanobeads, the diameter of which is between 10 and 100 nm. This PVAr filler, thanks to a very low density, allows the weight of polymeric compositions, especially elastomer compositions, to be reduced without degrading the reinforcement, and with an notable reduction in hysteresis.

Abstract: A pressure-sensitive adhesive sheet has a high adhesiveness and an excellent terminal peeling resistance as well as exhibits extremely small diffusing amounts of formaldehyde and toluene. The pressure-sensitive adhesive sheet contains at least a pressure-sensitive adhesive layer of a water-dispersion type acrylic pressure-sensitive adhesive containing a water-dispersion type acrylic polymer and a tackifying resin-containing emulsion, wherein a diffusing amount of formaldehyde is less than 3 ?g/m3 and a diffusing amount of toluene is 10 ?g/g or less. As the tackifying resin-containing emulsion, a tackifying resin-containing emulsion prepared using substantially no organic solvents or a tackifying resin-containing emulsion prepared using a material other than aromatic hydrocarbon-based organic solvents can be suitably employed.

Abstract: The present invention refers to a heat shrinkable film, wherein the outer surface layer of the film comprises a blend of a ionomer with an acid content less than 12% by weight; a ionomer with an acid content more than 12% by weight and a polybutylene homopolymer or copolymer. Additionally, a method of producing said film as well as packaging materials comprising said film is described.

Abstract: A surfacing composition made of recycled paint, which requires no priming, has a non-reflective “flat” appearance, and is partially composed of dried paint. The composition provides a useful application for used or excess household paint, which would otherwise require special methods of disposal and potentially create future toxic cleanup problems. The composition is made of granular dried paint and a water-based sealer, which can be spread on a surface to repair imperfections. The surface can then be finished, and no priming is required. Due to the composition's flat appearance, the patch does not display any characteristic sheen where the repair has been made. The composition provides a simple means of recycling paint, and provides a simple and inexpensive means of repairing imperfections in walls and other surfaces while saving the step of priming the patch before painting or repainting.

Abstract: Provided is a thermoplastic resin composition having high impact resistance at low temperature and molded articles with good appearance using the thermoplastic resin composition. The thermoplastic resin composition contains 0.5 to 20 parts by mass of a rubbery elastomer (B) relative to 100 parts by mass of a resin mixture (A) comprising 45 to 97% by mass of a polycarbonate resin (a-1) and 55 to 3% by mass of a fatty acid polyester (a-2), wherein the component (B) is dispersed in the component (a-1).

Abstract: A thermoplastic resin composition comprising a polylactic acid polymer (A), an acrylic polymer (B) containing units of methyl methacrylate monomer, and a graft copolymer (C) obtained by graft-polymerizing a vinyl monomer onto a rubbery polymer, wherein the refractive index, Rc, of the graft copolymer (C) and the total refractive index, Rab, of the polylactic acid polymer (A) and the acrylic polymer (B) satisfy the following formula (1) ?0.004?Rc?Rab?+0.008??(1).

Abstract: Disclosed are polyester blends useful for the preparation of heat-shrinkable films, and heat-shrinkable films prepared therefrom. The heat shrinkable film may be oriented in the machine direction to produce films with high machine-direction shrinkage but low transverse growth or shrinkage. The films are useful for roll-fed, shrink-on label applications. Also disclosed are heat-shrinkable roll-fed labels prepared from reactor-grade polyesters.

Abstract: A resin composition includes polylactic acid resin, a plastic resin superior in heat resistance to the polylactic acid resin, and a nucleating agent that promotes crystallization of the polylactic acid resin, with the nucleating agent being a soluble azo lake pigment. The plastic resin superior in heat resistance to the polylactic acid resin is one which has a flexural modulus of elasticity no lower than 1000 MPa at 80° C.

Abstract: There is provided a practically useful aqueous resin composition which enables to obtain a coating film is satisfactory not only in corrosion resistance but also in coating adhesion when applied over a metal surface, specifically an aqueous resin composition which enables, in a form of a thin film having a thickness of about 0.1-5 ?m, to exhibit various properties practically required for surface treating agents for chromium-free surface-treated steel plates, namely excellent corrosion resistance, adhesion to steel plates, durability against alkaline degreasing agents or solvents which are used for removing a press oil used during press molding, adhesion to an overcoating material which is used for aesthetic purposes, mechanical stability and the like. The aqueous resin composition comprises 100 parts by mass of a copolymer of an ?,?-ethylenically unsaturated carboxylic acid and an olefin; and 0.