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US 5,708,122 AGranted
Liquid crystalline poly(ester-imides)
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert Ralph Luise
Life of this patent
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Abstract
Poly(ester-imides) containing t-butylhydroquinone and trimellitic anhydride as part of the repeat units, as well as other monomers, are useful as molding resins. The polymers have a high glass transition temperature and are particularly useful in applications requiring good wear resistance.
Claims13
A liquid crystalline polymer consisting essentially of repeat units of one or both of ##STR7## and optionally one or more of ##STR8## wherein (I)+(II) is about 30-100 mole percent of the repeat units;
- (III)+(IV)+(V) are 0 to about 70 mole percent of said repeat units;
- Y is p-phenylene or ##STR9## R is t-butyl;
- and Z is
- --O--, --C(O)--, --S--, --C(CH.sub.3).sub.2 -- or --SO.sub.2 --
- with the proviso that when (I) is present, at least one of (III), (IV) or (V) is present.
2 more elements
Dependencies are inferred from the claim text.