Claims
- 1. A process for producing a styrene-based polymer molding which comprises molding a styrene-based polymer having a syndiotactic configuration with a syndiotacticity of at least 70% in racemic pentad and then irradiating the resultant molding with electron rays, said styrene-based polymer having a weight average molecular weight of about 150,000 to 1,000,000 and being a homopolymer of styrene or a copolymer containing at least 70 mol % styrene and containing alkylstyrene as a comonomer.
- 2. The process as defined in claim 1, wherein the styrene-based polymer is molded at a mold temperature of not more than 200.degree. C.
- 3. The process as defined in claim 1, wherein the styrene-based polymer is molded by extrusion molding, injection molding, blow molding or inflation molding.
- 4. The process as defined in claim 1, wherein the styrene-based polymer is molded in the form of a film, a sheet, a laminated film or a three-dimensional structure.
- 5. The process as defined in claim 1, wherein the molding in a film form is stretched.
- 6. The process as defined in claim 1, wherein the molding is irradiated with electron rays at an acceleration voltage of 100 kV to 3 MV.
- 7. The process as defined in claim 1, wherein the molding is irradiated with electron rays at an absorption dose of 0.01 to 80 Mrad when it contains a cross-linking agent.
- 8. The process as defined in claim 1, wherein the molding is irradiated with electron rays at an absorption dose of 1 to 100 Mrad when it does not contain a cross-linking agent.
- 9. The process as defined in claim 1, wherein the molding is irradiated with electron rays at an electron current of 1 to 300 mA.
- 10. A process for producing a styrene-based polymer molding which comprises melting a styrene-based polymer having a syndiotactic configuration with a syndiotacticity of at least 70% in racemic pentad at a temperature exceeding the melting point thereof and then cooling to produce an amorphous or semi-crystallized sheet, stretching the sheet at a temperature between the glass transition temperature and the melting point to produce a stretched film, and then irradiating the stretched film with electron rays, said styrene-based polymer having a weight average molecular weight of about 150,000 to 1,000,000 and being a homopolymer of styrene or a copolymer containing at least 70 mol % styrene and containing alkylstyrene as a comonomer.
- 11. The process as defined in claim 10, wherein the stretched film is heated at a temperature between the glass transition temperature and the melting point.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-182825 |
Jul 1988 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 08/044,096, filed on Mar. 8, 1993, now U.S. Pat. No. 5,286,762, which is a continuation of application Ser. No. 07/642,141, filed on Jan. 15, 1991, now abandoned, which is a continuation-in-part of application Ser. No. 07/378,384, filed on Jul. 10, 1989, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (2)
Number |
Date |
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0210615 |
Feb 1987 |
EPX |
0318794 |
Jun 1989 |
EPX |
Divisions (1)
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Number |
Date |
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Parent |
44096 |
Mar 1993 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
642141 |
Jan 1991 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
378384 |
Jul 1989 |
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