Abstract: Provided is a graft copolymer (A) obtainable by graft-polymerizing, in the presence of 30 to 80 parts by mass of an ethylene-based polymer (a), an aromatic vinyl-based monomer (b) and, if necessary, another vinyl-based monomer (c) copolymerizable with the aromatic vinyl-based monomer (b) in a total amount of 20 to 70 parts by mass (provided that the sum of the components (a), (b) and (c) is 100 parts by mass), in which the ethylene-based polymer (a) has a density of 0.900 g/cm3 or more and less than 0.966 g/cm3, a number average molecular weight of 10,000 to 50,000, and a molecular weight distribution of 5 to 15, and the proportion of the ethylene-based polymer (a) molecules having a molecular weight of 10,000 or less is 5.5% or more.

Abstract: Provided is a graft copolymer (A) obtainable by graft-polymerizing, in the presence of 30 to 80 parts by mass of an ethylene-based polymer (a), an aromatic vinyl-based monomer (b) and, if necessary, another vinyl-based monomer (c) copolymerizable with the aromatic vinyl-based monomer (b) in a total amount of 20 to 70 parts by mass (provided that the sum of the components (a), (b) and (c) is 100 parts by mass), in which the ethylene-based polymer (a) has a density of 0.900 g/cm3 or more and less than 0.966 g/cm3, a number average molecular weight of 10,000 to 50,000, and a molecular weight distribution of 5 to 15, and the proportion of the ethylene-based polymer (a) molecules having a molecular weight of 10,000 or less is 5.5% or more.

Abstract: Provided is a graft copolymer (A) obtainable by graft-polymerizing, in the presence of 30 to 80 parts by mass of an ethylene-based polymer (a), an aromatic vinyl-based monomer (b) and, if necessary, another vinyl-based monomer (c) copolymerizable with the aromatic vinyl-based monomer (b) in a total amount of 20 to 70 parts by mass (provided that the sum of the components (a), (b) and (c) is 100 parts by mass), in which the ethylene-based polymer (a) has a density of 0.900 g/cm3 or more and less than 0.966 g/cm3, a number average molecular weight of 10,000 to 50,000, and a molecular weight distribution of 5 to 15, and the proportion of the ethylene-based polymer (a) molecules having a molecular weight of 10,000 or less is 5.5% or more.

Abstract: Provided is a graft copolymer (A) obtainable by graft-polymerizing, in the presence of 30 to 80 parts by mass of an ethylene-based polymer (a), an aromatic vinyl-based monomer (b) and, if necessary, another vinyl-based monomer (c) copolymerizable with the aromatic vinyl-based monomer (b) in a total amount of 20 to 70 parts by mass (provided that the sum of the components (a), (b) and (c) is 100 parts by mass), in which the ethylene-based polymer (a) has a density of 0.900 g/cm3 or more and less than 0.966 g/cm3, a number average molecular weight of 10,000 to 50,000, and a molecular weight distribution of 5 to 15, and the proportion of the ethylene-based polymer (a) molecules having a molecular weight of 10,000 or less is 5.5% or more.

Abstract: The invention provides:primary particles of amorphous silica composite material, characterized in that they are composed of numerous granular amorphous silica particles randomly attached to amorphous silica particles retaining the original configuration of calcium silicate crystals as starting crystals and having a crystalline appearance;secondary particles of amorphous silica composite material, characterized in that they are composed of said primary particles randomly three-dimensionally interlocked with one another;shaped bodies of amorphous silica composite material, characterized in that they are composed of either or both of said primary particles and said secondary particles randomly three-dimensionally interlocked with one another; andprocesses for preparing said primary particles, said secondary particles or said shaped bodies thereof.

Abstract: A thermoplastic resin composition comprising:(A) polyamide have a relative viscosity in sulfuric acid of not less than 2.0 and less than 3.0,(B) a graft copolymer which is obtainable by copolymerizing an aromatic vinyl monomer, a cyanated vinyl monomer and other vinyl monomer copolymerizable with the former two monomers in the presence of a rubbery polymer and(C) a carboxylic acid-modified copolymer comprising monomeric units derived from an aromatic vinyl monomer, a cyanated vinyl monomer and an .alpha.,.beta.-unsaturated monocarboxylic acidwherein the weight ratio of polyamide (A) to the total amount of the graft copolymer (B) and the carboxylic acid-modified copolymer (C) is from 90:10 to 10:90, the content of .alpha.,.beta.-unsaturated monocarboxylic acid is 0.1 to 1.5% by weight based on the total amount of the graft copolymer (B) and the carboxylic acid-modified copolymer (C), and the content of rubbery polymer is 5 to 30% by weight based on the whole weight of the composition.