Temperature resistant aromatic polyethers

US4990588A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Joachim Knebel · Zwingenberg, DE
• Werner Ude · Darmstadt, DE
• Joachim Vetter · Offenbach, DE

Key dates

• Filing date: Feb 8, 1989
• Grant date: Feb 5, 1991
• Expiry date: Feb 8, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/405
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

What are disclosed are aromatic polyethers which are resistant to high temperature, having a reduced viscosity greater than 0.25 dl/g and a repeating structural unit EQU [(A-O).sub.a (B-O).sub.b (C-O).sub.c ], wherein A is 5a,10b-diphenyl-coumarano[2',3',2,3]coumaran of the formula ##STR1## B has the formula ##STR2## wherein n is 0 or 1, and X is ##STR3## and/or ##STR4## and C is at least one further aromatic unit.