Method of synthesis of thermoplastic aromatic benzoxazole polyme

Details Method of synthesis of thermoplastic aromatic benzoxazole polyme Method of synthesis of thermoplastic aromatic benzoxazole polyme

1988-09-08

1990-06-05

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528176, 528179, 528191, C08G 7322

Patent

active

049315323

ABSTRACT:
There is provided an aromatic benzoxazole polymer having repeating units of the formula ##STR1## wherein Ar is ##STR2## wherein R is an alkyl group having 8 to 12 carbon atoms. The polymers of this invention are prepared by the polycondensation of 4,4'-hexafluoroisopropylidene bis(2-aminophenol) with a dicarboxylic acid selected from the group consisting of isophthalic acid, terephthalic acid, 2,5-pyridine dicarboxylic acid, 2,6-pyridine dicarboxylic acid and a 2,5-bis(alkoxy) terephthalic acid of the formula ##STR3## wherein R is an alkyl group having 8 to 12 carbon atoms, in a suitable reaction medium containing a suitable dehydrating agent.

REFERENCES:
patent: 4820793 (1989-04-01), Imai et al.

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