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Title:
METHOD FOR MOLDING ARTICLE MADE OF THERMOPLASTIC NORBORNENE RESIN
Document Type and Number:
Japanese Patent JP2005305941
Kind Code:
A
Abstract:

To provide a method for molding an article free from a fish-eye generated when a cyclic olefin copolymer is melt-molded.

In the method for melt-molding an article using a thermoplastic norbornene resin composed of a cyclic olefin and an α-olefin copolymer, the resin heated up to a higher temperature than the upper limit Tu of a gel generating temperature region, is kneaded and melted by heating the resin in such a state that it is not subjected to a shearing force. In addition, the upper limit Tu(°C) of the gel generating temperature region is 8.52Tg0.605 (Tg is a glass transition temperature(°C) of the resin material) and the cyclic olefin is especially norbornene or tetracyclododecene and the α-olefin is especially ethylene or propylene. In order to preheat the resin, the resin is desirably heated by a hot blast while being conveyed so as not to cause the mutual fusing of the resin within a raw material feeding hopper.


Inventors:
Taya, Naoki
Shijiki, Takashi
Sasayama, Koji
Application Number:
JP2004000129138
Publication Date:
November 04, 2005
Filing Date:
April 26, 2004
Export Citation:
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Assignee:
C I KASEI CO LTD
International Classes:
B29C47/00; C08F210/02; C08F210/06; C08F232/08; B29K45/00; (IPC1-7): B29C47/00; C08F210/02; C08F210/06; C08F232/08