Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1981-05-05
1983-12-27
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528183, 528185, 528207, 528208, 528286, 528289, 528290, 528291, 528336, 528337, 528377, G08G 7306, G08G 7322
Patent
active
044232020
ABSTRACT:
A process for the production of para ordered aromatic heterocyclic polymer is provided. The process comprises heating a first reactant with the dichloride derivative of at least one aromatic dicarboxylic acid in polyphosphoric acid at a temperature within the range of approximately 100.degree. C. to 250.degree. C. until the polymerization reaction is complete. The first reactant comprises at least one aromatic diaminodiol or at least one aromatic diaminodithiol, wherein each amine group is paired with a hydroxy group or a thiol group upon adjacent carbon atoms of the aromatic nucleus. Preferably, the process of the present invention is employed in the production of para ordered aromatic polybisoxazoles wherein the first reactant comprises at least one aromatic diaminodiol. In an especially preferred embodiment, the present invention provides a process for the production of high molecular weight polyparaphenylenebenzobisoxazole, the process comprising heating 4,6-diaminoresorcinol with terephthaloyl dichloride in polyphosphoric acid.
REFERENCES:
patent: 3313783 (1967-04-01), Iwakura et al.
patent: 4225700 (1980-09-01), Wolfe et al.
Makromolekulare Chemie, vol. 83, Polybenzazoles, 4/65 pp. 179-187, Imai et al.
Research Polymers, New Linear Polymers, McGraw-Hill Book Company, Nov. 14, 1968, pp. 331-349.
Celanese Corporation
Lee Lester L.
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