Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1991-12-09
1993-08-03
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528179, 528183, 528272, 528274, 528337, 528342, C08G 6300, C08G 6302, C08G 6942
Patent
active
052330141
ABSTRACT:
The invention is a condensation polymerization reaction in which functionally terminated polybenzazole ligomers are reacted in a solvent acid at a temperature of at least 150.degree. C. and a shear of at least about 10 sec..sup.-1 under conditions so that the desired molecular weight is reached in no more than about 4 hours. The oligomers may be, for example, derived from the reaction of 4,6-diaminoresorcinol bis(hydrochloride) and terephthalic acid. The concentration of oligomers is high enough so that the reaction mixture contains liquid crystalline domains.
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Gregory Thomas
Hurtig Carl W.
Ledbetter Harvey D.
Quackenbush Kenneth J.
Rosenberg Steven
Kight III John
Mosley T.
The Dow Chemical Company
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