Title:
【発明の名称】環状オレフィン系ランダム共重合体ペレットおよびその製造方法
Document Type and Number:
Japanese Patent JP3205339
Kind Code:
B2
Abstract:
119 The copolymer pellets of the invention are made from a cycloolefin random copolymer which is formed from ethylene and a cycloolefin and has a softening temperature of not lower than 70 .degree.C. The number of cyclohexane-insoluble fine particles contained in 30 mg of the pellets is not more than 60,000. The pellets can be prepared by using various processes singly or in combination, namely, a process wherein a copolymer powder is preheated to a temperature of not lower than 50 .degree.C and fed to an extruder, a process wherein the temperature of the melt starting position of the extruder is set to be the highest and set to be a temperature higher than Tg of the copolymer by not lower than 90 .degree.C, a process wherein the copolymer is meltextruded by a twin-screw extruder whose screws rotate in the same direction, a process wherein the copolymer extruded in the molten state is filtered at a differential pressure of not more than 90 kg/cm2, and a process wherein the pellets are dried in such a manner that the amount of a fine powder produced from the pellets in the drying stage is not more than 100 ppm.
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Inventors:
Masayuki Okabe
Hideki Sakai
Kazuyuki Takimoto
Tetsushi Kasai
Takehiko Kawate
Kenji Wakatsuru
Hideki Sakai
Kazuyuki Takimoto
Tetsushi Kasai
Takehiko Kawate
Kenji Wakatsuru
Application Number:
JP50387494A
Publication Date:
September 04, 2001
Filing Date:
January 24, 1994
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
B29B9/06; B29B9/12; B29B13/06; C08F210/02; C08F232/08; C08G61/08; C08J3/12; (IPC1-7): B29B9/12; C08F210/02
Domestic Patent References:
| JP2191603A |
Attorney, Agent or Firm:
Shunichiro Suzuki
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