Abstract: A resin film comprising a multilayer structure acrylic polymer and the film having an acid value of not more than 0.018 mmol/g in an acetone insoluble matter, an acid value of not more than 0.012 mmol/g in an acetone soluble matter, a glass transition temperature of not less than 80° C. and a thickness of 5 to 300 ?m is obtained by a method comprising emulsion polymerization for producing a latex comprising multilayer structure acrylic polymer, coagulating the latex comprising the multilayer structure acrylic polymer to obtain a slurry, washing and dehydrating the slurry, drying the dehydrated slurry to remove the multilayer structure acrylic polymer, mixing 0 to 35% by mass of an acrylic resin and 65 to 100% by mass of the removed multilayer structure acrylic polymer and subjecting the resultant mixture melted to an extrusion molding.

Abstract: The present invention provides a methacrylic resin composition comprising 75 to 99.8 mass % of a methacrylic resin [A], 0.1 to 15 mass % of a UV absorber [B], and 0.1 to 10 mass % of a polymer [C] having an SP value of 6.0 to 9.7 (cal/cm3)1/2 calculated by the Fedors method.

Abstract: A methacrylic resin composition comprising 100 parts by mass of a methacrylic resin having an amount of a terminal double bond of less than 0.012% by mole and an amount of a bonded sulfur atom of preferably less than 0.25% by mole; 5×10?6 to 9×10?3 part by mass of a metal element having an atomic number of not more than 20 (preferably lithium element and aluminum element); and 0.025 to 0.50 part by mass of a hindered phenol antioxidant such as 2,6-bis(1,1-dimethylethyl)-4-methylphenol, wherein the methacrylic resin composition, when being exposed to a nitrogen gas atmosphere at 290° C. for 15 minutes, has a thermogravimetric retention of not less than 98% by mass.

Abstract: The present invention provides a methacrylic resin composition comprising 75 to 99.8 mass % of a methacrylic resin [A], 0.1 to 15 mass % of a UV absorber [B], and 0.1 to 10 mass % of a polymer [C] having an SP value of 6.0 to 9.7 (cal/cm3)1/2 calculated by the Fedors method.

Abstract: A methacrylic copolymer having high thermal resistance and low water absorption and being hardly decomposed thermally is provided. The methacrylic copolymer comprises 5 to 22% by mass of a structural unit derived from a monomer represented by formula (1) (in formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a 1C-4C alkyl group, and “n” is an integer of 1 to 3.) and 78 to 95% by mass of a structural unit derived from a methacrylic acid ester monomer other than the monomer represented by the formula (1), and has a saturated water absorption of not more than 1.6% by mass.

Abstract: A methacrylic resin composition comprising 100 parts by mass of a methacrylic resin having an amount of a terminal double bond of less than 0.012% by mole and an amount of a bonded sulfur atom of preferably less than 0.25% by mole; 5×10?6 to 9×10?3 part by mass of a metal element having an atomic number of not more than 20 (preferably lithium element and aluminum element); and 0.025 to 0.50 part by mass of a hindered phenol antioxidant such as 2,6-bis(1,1-dimethylethyl)-4-methylphenol, wherein the methacrylic resin composition, when being exposed to a nitrogen gas atmosphere at 290° C. for 15 minutes, has a thermogravimetric retention of not less than 98% by mass.

Abstract: A methacrylic copolymer having high thermal resistance and low water absorption and being hardly decomposed thermally is provided. The methacrylic copolymer comprises 5 to 22% by mass of a structural unit derived from a monomer represented by formula (1) (in formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a 1C-4C alkyl group, and “n” is an integer of 1 to 3.) and 78 to 95% by mass of a structural unit derived from a methacrylic acid ester monomer other than the monomer represented by the formula (1), and has a saturated water absorption of not more than 1.6% by mass.

Abstract: A resin film comprising a multilayer structure acrylic polymer and the film having an acid value of not more than 0.018 mmol/g in an acetone insoluble matter, an acid value of not more than 0.012 mmol/g in an acetone soluble matter, a glass transition temperature of not less than 80° C. and a thickness of 5 to 300 pm is obtained by a method comprising emulsion polymerization for producing a latex comprising multilayer structure acrylic polymer, coagulating the latex comprising the multilayer structure acrylic polymer to obtain a slurry, washing and dehydrating the slurry, drying the dehydrated slurry to remove the multilayer structure acrylic polymer, mixing 0 to 35% by mass of an acrylic resin and 65 to 100% by mass of the removed multilayer structure acrylic polymer and subjecting the resultant mixture melted to an extrusion molding.

Abstract: Provided is a polymer electrolyte membrane that is formed of a fluorine free material, is soft and hardly cracks, and is excellent in hot water resistance. The polymer electrolyte membrane is obtained by crosslinking a block copolymer (Z) containing a polymer block (A) containing a structural unit derived from an aromatic vinyl compound and having an ion-conducting group; and an amorphous polymer block (B) containing a structural unit derived from an unsaturated aliphatic hydrocarbon and free of any ion-conducting group, the block copolymer (Z) being crosslinked with a crosslinking agent (X) having, in a molecule thereof, two or more aromatic rings of which one or more hydrogen atoms are substituted with hydroxy groups.

Abstract: An electrolyte membrane having a structure wherein fine rubber particles having substantially no ion-conducting group and having an average particle size of 20 nm to 1 ?m are uniformly dispersed in a matrix including a resin component having ion-conducting group. The electrolyte membrane has high bonding ability to electrodes and does not cause cracks and ruptures because it is kept flexible even under low humid or absolutely dried condition, in addition, shows high ion conductivity even under low humid or absolutely dried condition because the matrix having ion-conducting groups are continuous.

Abstract: An electrolyte membrane having a structure wherein fine rubber particles having substantially no ion-conducting group and having an average particle size of 20 nm to 1 ?m are uniformly dispersed in a matrix including a resin component having ion-conducting group. The electrolyte membrane has high bonding ability to electrodes and does not cause cracks and ruptures because it is kept flexible even under low humid or absolutely dried condition, in addition, shows high ion conductivity even under low humid or absolutely dried condition because the matrix having ion-conducting groups are continuous.