Title:
POLYIMIDE
Document Type and Number:
Japanese Patent JP3137547
Kind Code:
B2
Abstract:
PURPOSE: To obtain an amorphous polyimide not only excellent in heat resistance but also having a good moldability by reacting a specific arom. diamine with a tetracarboxylic dianhydride and imidizing the resulting polyamic acid.
CONSTITUTION: An arom. diamine of formula I (wherein X is a direct bond, 0, or S; and R1, R2, R3, and R4 each is or CH3) is reacted with a tetrcarboxylic dianhydride component mainly comprising a dianhydride of formula II (wherein Ar is a tetravalent noncondensed polycyclic arom. group formed by linking 6-27C monocyclic arom. groups to each other directly or through linking members) to give a polyamic acid, which is imidized thermally or chemically to give an amorphous polyimide having, as the essential structural units, at least one kind of repeating structural units of formula III (wherein R1, R2, R3, R4, and Ar each is the same as described above). Thus obtd. polyimide has an excellent melt flow stability and a greatly improved moldability in addition to the high heat resistance inherent in a polyimide.
Inventors:
Wataru Yamashita
Yuichi Ohkawa
Masashi Tamai
Mitsunori Matsuo
Tsutomu Ishida
Keizaburo Yamaguchi
Akihiro Yamaguchi
Yuichi Ohkawa
Masashi Tamai
Mitsunori Matsuo
Tsutomu Ishida
Keizaburo Yamaguchi
Akihiro Yamaguchi
Application Number:
JP31049094A
Publication Date:
February 26, 2001
Filing Date:
December 14, 1994
Export Citation:
Assignee:
Mitsui Chemicals, Inc.
International Classes:
C07C221/00; C07C225/22; C07C319/20; C07C323/31; C08G73/10; C08J5/06; C08J5/08; C08J5/18; (IPC1-7): C08G73/10; C08J5/06; C08J5/08; C08J5/18
Attorney, Agent or Firm:
Shotaro Mogami