熱可塑性ノルボルネン系樹脂からなる物品の成形方法

Title:

熱可塑性ノルボルネン系樹脂からなる物品の成形方法

Document Type and Number:

Japanese Patent JP4136996

Kind Code:

B2

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:

Naoki Taya
Shun Shiki
Koji Sasayama

Application Number:

JP2004129138A

Publication Date:

August 20, 2008

Filing Date:

April 26, 2004

Export Citation:

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Assignee:

CI Kasei Co., Ltd.

International Classes:

B29C47/00; B29B13/02; C08F210/02; C08F210/06; C08F232/08; B29K45/00

Domestic Patent References:

JP2001315189A
JP2000290313A
JP7060820A
JP1297226A
JP1237113A
JP7256724A

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