NEW DIAMINOBENZENE DERIVATIVE AND POLYIMIDE MADE THEREFROM

Japanese Patent JP3430705

B2

PURPOSE: To obtain a polyimide which can give a large tilt angle by rubbing, has a good wettability with liquid crystals and used for an aligning film having a satisfactory ability to align liquid crystals by using a specified diaminobenzene derivative as the starting material.
CONSTITUTION: A diamine component containing at least 1mol% diaminobenzene derivative represented by the formula (wherein P and Q are each a single bond or a bivalent organic group selected from among -O-, -COO- and -CONH-; R1 is 2-22 C linear alkylene; and R2 is a cyclic substituent selected from among an aromatic ring, an alicyclic group, a heterocyclic ring and substituted derivatives thereof) is reacted with an alicyclic tetracarboxylic acid or its derivative at 20-150°C to obtain a polyimide precursor having a reduced viscosity of 0.05-5.0dl/g as measured in N-methylpyrrolidone in a concentration of 0.5g/dl at 30°C. The obtained precursor is imidated through ring closure by dehydration by heating or chemically imidated through ring closure in the presence of an imidation catalyst to obtain a polyimide containing at least 5mol% diaminobenzene derivative represented by formula I.

Takayasu Nihira
Sadao Miyamoto
Hideyuki Endo
Toyohiko Abe

JP10409895A

July 28, 2003

April 27, 1995

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Nissan Chemical Industry Co., Ltd.

G02F1/1337; C07C217/76; C07C217/84; C07C219/32; C07C219/34; C07C229/40; C07C229/54; C07C237/20; C07C237/32; C07C237/34; C07C237/36; C08G73/10; C09K19/56; (IPC1-7): C08G73/10; C07C217/76; C07C217/84; C07C219/32; C07C219/34; C07C229/40; C07C229/54; C07C237/20; C07C237/32; C07C237/34; C07C237/36; C09K19/56; G02F1/1337

JP5216046A
JP47333A
JP3250028A
JP606726A

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