Styrene-based resin composition

A fibrous molding produced by spinning a styrene-based resin composition comprising (A) a styrene-based polymer having mainly a syndiotactic configuration as resin component and (B) a phosphorus-containing antioxidant and a phenolic antioxidant as antioxidant wherein the total amount of the phosphorus-containing antioxidant and the phenolic antioxidant is 0.01 to 30 parts by weight per 100 parts by weight of the styrene-based polymer, and the weight ratio of the phosphorus-containing antioxidant to the phenolic antioxidant is 100:1 to 0.3.

A molding produced by stretching a styrene-based resin composition comprising (A) a styrene-based polymer having mainly a syndiotactic configuration as resin component and (B) a phosphorus-containing antioxidant and a phenolic antioxidant as antioxidant wherein the total amount of the phosphorous-containing antioxidant and the phenolic antioxidant compounded is 0.005 to 5 parts by weight per 100 parts by weight of the styrene-based polymer, and the weight ratio of the phosphorus-containing antioxidant to the phenolic antioxidant is 100:1 to 0.3:1.

A stretched styrene-based resin molding as obtained by subjecting a styrene-based polymer having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000 to uniaxial stretching of at least two times or to biaxial stretching of at least 1.2 times in each direction with a subsequent annealing at a temperature of 120.degree. C. to 250.degree. C.

A shaped article of a styrene-based polymer prepared by drawing a styrene-based polymer having a weight-average molecular weight of at least 100,000 and a mainly syndiotactic structure and thereafter annealing the drawn polymer at a temperature of 120.degree. C. to 250.degree. C.

A process for producing a stretched styrene-based resin molding which comprises subjecting a styrene-based resin having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000 to uniaxial stretching of at least two times or biaxial stretching of at least 1.2 times in each direction and thereafter, annealing the stretched resin at a temperature of 120.degree. C. to 250.degree. C.

A process for producing a stretched styrene-based resin molding which comprises heat melting a styrene-based resin having mainly syndiotactic configuration and a weight average molecular weight of at least 50,000, quenching the molten resin, then subjecting the quenched resin to uniaxial stretching at a draw of at least two times or biaxial stretching at a draw ratio of at least 1.2 times in each direction and thereafter, annealing the stretched resin temperature of 120.degree. C. to 250.degree. C.