| abstract |
(57) [Problem] To provide a rigid and chemically stable polyurethane having heat resistance (high glass transition point) and film forming ability. SOLUTION: A polyurethane having a repeating unit represented by the following formula (1) and having a weight average molecular weight of 2,000 to 200,000. R represents an alkylene group, a phenylene group that can have an alkyl group, or a xylylene group that can have an alkyl group. It can be obtained by reacting 9,9-bis (4- (2-hydroxypropoxy) phenyl) -fluorene with diisocyanates in the presence or absence of a solvent. Embedded image |