Title:
NEW COPOLYMER AND PRODUCTION THEREOF
Document Type and Number:
Japanese Patent JP3493363
Kind Code:
B2
Abstract:
PURPOSE: To obtain a new copolymer, having excellent heat, chemical and radiation resistances, low-temperature characteristics, adhesion, etc., while having sufficient mechanical strengths and useful as a laminating film, etc., for insulation coating and having thermal fusibility.
CONSTITUTION: This copolymer is a polyamic acid copolymer, a polyisoimide or a polyimide polymer expressed by formula I [R1 is a bivalent organic group; R2 is a tetravalent organic group; X is a trivalent binding group such as a group expressed by formula II; (m) and (n) are positive integers]. The copolymer is obtained by dissolving 2,2-bis(4-hydroxyphenyl)propane dibenzoate-3,3',4,4'- tetracarboxylic acid dianhydride in an organic polar solvent, charging a diamine compound such as p-diaminobenzene thereinto, adding an acid dianhydride expressed by formula III (Ar3 is a tetravalent organic group such as a group expressed by formula IV as the third component thereto so that the molar amounts of the acid dianhydride and the diamine compound substantially equimolar and then cyclodehydrating the resultant reactional mixture.
Inventors:
Hiroyuki Furuya
Kazuhisa Danno
Junya Ida
Keishi Okamoto
Hirosaku Nagano
Kazuhisa Danno
Junya Ida
Keishi Okamoto
Hirosaku Nagano
Application Number:
JP23098093A
Publication Date:
February 03, 2004
Filing Date:
August 23, 1993
Export Citation:
Assignee:
Kanegafuchi Chemical Industry Co., Ltd.
International Classes:
C08G73/10; C08G73/16; H05K1/03; (IPC1-7): C08G73/10; C08G73/16
Domestic Patent References:
| JP4198319A | ||||
| JP4366131A |
Attorney, Agent or Firm:
Takayoshi Kusumoto