Temperature stable thermotropic poly(ester carbonate) derived from t-butylhydroquinone
AssigneeAllied Corporation
InventorsMurali K. Akkapeddi, Bruce T. DeBona, Yu-Chin Lai, Dusan C. Prevorsek
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Abstract
A thermotropic poly(ester carbonate) containing diacyl moieties such as terephthalate and carbonate moieties as well as dihydroxy-derived moieties is useful for forming fibers or films. The dihydroxy-derived moieties are at least 40% derived from t-butylhydroquinone, with hydroquinone and methylhydroquinone being exemplary second components. The polymers can be prepared by melt, solution or interfacial polymerization, are liquid crystalline in the melt and have glass transition temperatures above 100.degree. C.
Claims7
In a thermotropic poly(ester carbonate) having diacyl moieties which are primarily terephthalate moieties, dihydroxy-derived moieties derived primarily from substituted hydroquinone and carbonate moieties, the improvement wherein the dihydroxy-derived moieties are at least about 40 mol percent t-butyl-benzene-2,5-dioxy, with the remaining substituted benzene-dioxy moieties being substituted by alkyl of 1-6 carbons, alkoxy of 1-6 carbons, phenyl or halo.
Dependencies are inferred from the claim text.