Method of preparing aromatic polyamides and polybenzoxazoles

Details Method of preparing aromatic polyamides and polybenzoxazoles Method of preparing aromatic polyamides and polybenzoxazoles

1987-05-28

1989-04-11

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528 26, 528 33, 528 38, 528 43, 528185, 528348, C08G 7306

Patent

active

048207934

ABSTRACT:
An aromatic polyamide of sufficiently high molecular weight is prepared by reacting a diphenyldiamino compound having a hydroxyl or siloxyl group in each phenyl group and a Si-containing substituent in each amino group, e.g. 2,2-bis(3-trimethylsilylamino-4-trimethylsiloxyphenyl) propane, with an aromatic dicarboxylic acid dihalide in an organic solvent. The polyamide can be converted into a polybenzoxazole by a dehydrating and cyclizing reaction at 100.degree.-500.degree. C.

REFERENCES:
patent: 4423202 (1983-12-01), Choe

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