Material for extrusion molding and process for preparation of molding product

A pellet for extrusion molding having a ratio of length in extrusion direction to length in perpendicular direction of 0.5 to 3 and a length or width of extrusion direction or perpendicular direction of 1 to 6 mm consisting essentially of at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene having a high degree of syndiotactic configuration, a melt viscosity of 10.sup.3 to less than 10.sup.6 poise measured at 300.degree. C. and a shearing rate of 10/sec, and a crystallinity of 15% to 60% and at least one member selected from the group consisting of a thermoplastic resin, a rubber, an inorganic filler, an antioxidant, a nucleating agent, a plasticizer, a solubilizing agent, a colorant, and an antistatic agent.

A process for preparing a pellet having a ratio of length in extrusion direction to length in perpendicular direction of 0.5 to 3 and a length or width of extrusion direction or perpendicular direction of 1 to 6 mm and a crystallinity of 15% to 60% comprising melt extruding at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene having a high degree of syndiotactic configuration and a melt viscosity of 10.sup.3 to less than 10.sup.6 poise measured at 300.degree. C. and a shearing rate of 10/sec, and then air cooling and cutting the extruded polymer.

A process for preparing a pellet having a ratio of length in extrusion direction to length in perpendicular direction of 0.5 to 3 and a length or width of extrusion direction or perpendicular direction of 1 to 6 mm comprising melt extruding a composition consisting essentially of at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene having a high degree of syndiotactic configuration, a melt viscosity of 10.sup.3 to less than 10.sup.6 poise measured at 300.degree. C. and a shearing rate of 10/sec, and a crystallinity of 15% to 60% and at least one member selected from the group consisting of a thermoplastic resin, a rubber, an inorganic filler, an antioxidant, a nucleating agent, a plasticizer, a solubilizing agent, a colorant, and an antistatic agent, and then air cooling and cutting the extruded composition.

A process for preparing a pellet having a ratio of length in extrusion direction to length in perpendicular direction of 0.5 to 3 and a length or width of extrusion direction or perpendicular direction of 1 to 6 mm and a crystallinity of 15% to 60% comprising melt extruding at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene having a high degree of syndiotactic configuration and a melt viscosity of 10.sup.3 to less than 10.sup.6 poise measured at 300.degree. C. and a shearing rate of 10/sec, water cooling and cutting the extruded polymer, and then heating the cut polymer.

A process for preparing a pellet having a ratio of length in extrusion direction to length in perpendicular direction of 0.5 to 3 and a length or width of extrusion direction or perpendicular direction of 1 to 6 mm comprising melt extruding a composition consisting essentially of at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene having a high degree of syndiotactic configuration, a melt viscosity of 10.sup.3 to less than 10.sup.6 poise measured at 300.degree. C. and a shearing rate of 10/sec, and a crystallinity of 15% to 60% and at least one member selected from the group consisting of a thermoplastic resin, a rubber, an inorganic filler, an antioxidant, a nucleating agent, a plasticizer, a solubilizing agent, a colorant, and an antistatic agent, water cooling and cutting the extruded composition, and then heating the cut composition.