Claims
- 1. 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 comprising 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%.
- 2. The pellet according to claim 1, wherein the crystallinity is 20% to 60%.
- 3. The pellet for extrusion molding according to claim 1, wherein the crystallinity is 30% to 60%.
- 4. 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.
- 5. 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.
- 6. The process according to claim 5, wherein the at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene is melt-extruded at a temperature in the range between the melting point of the polymer and a temperature 100.degree. C. higher than the melting point.
- 7. 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.
- 8. The process according to claim 7, wherein the composition is melt-extruded at a temperature in the range between the melting point of the at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene and a temperature 100.degree. C. higher than the melting point.
- 9. 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.
- 10. The process according to claim 9, wherein the at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene is melt-extruded at a temperature in the range between the melting point of the polymer and a temperature 100.degree. C. higher than the melting point.
- 11. The process according to claim 9, wherein the extruded and cut polymer is heated at a temperature in the range between the glass transition temperature of the polymer and a temperature 10.degree. C. lower than the melting point of the polymer.
- 12. 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.
- 13. The process according to claim 12, wherein the composition is melt-extruded at a temperature in the range between the melting point of the at least one member selected from the group consisting of polystyrene, poly(alkylstyrene), and copolymer of styrene and alkylstyrene and a temperature 100.degree. C. higher than the melting point.
- 14. The process according to claim 12, wherein the extruded and cut composition is heated at a temperature in the range between the glass transition temperature of the polymer and a temperature 10.degree. C. lower than the melting point of the polymer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
13238/1989 |
Jan 1989 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 07/464,935, filed on Jan. 16, 1990, U.S. Pat. No. 5,164,479.
US Referenced Citations (3)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0291915 |
Nov 1988 |
EPX |
0318794 |
Nov 1988 |
EPX |
0325125 |
Jan 1989 |
EPX |
0356856 |
Mar 1990 |
EPX |
Non-Patent Literature Citations (2)
Entry |
Chemical Abstracts, vol. 108, 1988, p. 49, abstract No. 151651n for JP 62-257950. |
Spencer et al, "The Viscous Flow of Molten Polystyrene . . . ", Journal of Colloid Sci., vol. 4, 241 (1949). |
Divisions (1)
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Number |
Date |
Country |
Parent |
464935 |
Jan 1990 |
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