C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
18/1039
C08L 23/10 (2006.01) B29C 55/00 (2006.01) C08F 110/06 (2006.01) C08J 5/18 (2006.01) C08J 7/02 (2006.01) D01F 6/06 (2006.01)
Patent
CA 2040008
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 struc- ture, 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.
Asanuma Tadashi
Inoue Takeo
Ito Mitsuru
Kimura Shigeru
Sasaki Tateyo
Fetherstonhaugh & Co.
Mitsui Chemicals Incorporated
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