Plastic and nonmetallic article shaping or treating: processes – Disparate treatment of article subsequent to working,...
Patent
1991-04-02
1993-04-06
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Disparate treatment of article subsequent to working,...
264 83, 2642103, 26421113, 26421114, 2642356, 264291, 26433117, D01F 606, B29D 701, B29C 7100, B29C 5502
Patent
active
052001318
ABSTRACT:
A method for molding a polypropylene or a propylene copolymer having a syndiotactic structure which comprises the steps of melting, molding, if desired, quenching and then stretching a propylene homopolymer or a copolymer of propylene and a small amount of ethylene or another .alpha.-olefin which has a substantially syndiotactic structure, or a mixture of the same and a small amount of a polypropylene having a substantially isotactic structure. The molded and stretched article can be heated at a temperature of a molding temperature or more, while a load is applied to the article. Furthermore, the molded and stretched article, if desired, can be treated with a hydrocarbon vapor, while a load is applied to the article. The molded article obtained by the method of the present invention has a novel crystalline structure.
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World Patents Index Latest, Week 8340, Derwent Publications Ltd., London, GB; AN 83-779353[40] & JP-A-58 142 818 (Idsemitsu Petrochem, KK) Aug. 25, 1983.
World Patents Index Latest, Week 9191, Derwent Publications Ltd., London, GB; AN 86-261852[40] & JP-A-61 189 920 (Idsemitsu Petrochem, KK) Aug. 23, 1986.
Asanuma Tadashi
Inoue Takeo
Ito Mitsuru
Kimura Shigeru
Sasaki Tateyo
Lowe James
Mitsui Toatsu Chemicals Inc.
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