Synthesis of polybenzoxasole and polybenzothiazole precursors

Details Synthesis of polybenzoxasole and polybenzothiazole precursors Synthesis of polybenzoxasole and polybenzothiazole precursors

1997-12-10

1999-03-16

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528172, 528173, 528174, 528337, 528352, 528353, 528373, 528377, C08G 6540, C08G 6300

Patent

active

058832211

ABSTRACT:
In a method of synthesis of polybenzoxazole and polybenzothiazole precursors, a dicarboxylic acid or a dicarboxylaic acid ester is reacted with a bis-o-aminophenol or bis-o-aminothiophenol in a suitable solvent in the presence of an activating reagent having the following structure: ##STR1##

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patent: 5021320 (1991-06-01), Mueller et al.
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patent: 5077378 (1991-12-01), Mueller et al.
patent: 5096999 (1992-03-01), Hellmut et al.
patent: 5147961 (1992-09-01), Ahne et al.

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