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US 5,397,502 AGranted
Heat resistant liquid crsytalline polymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsMarion G. Waggoner, Michael R. Samuels, David F. Adcock
Life of this patent
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Abstract
The heat resistance of polyester liquid crystalline polymers containing repeat units in selected ratios derived from hydroquinone, 4,4'-biphenol, terephthalic acid, 4-hydroxybenzoic acid, and one or both of 4,4'-bibenzoic acid and 2,6-naphthalene dicarboxylic acid is improved by the addition thereto of 15 to 3000 ppm of an alkali metal or 50 to 3000 ppm magnesium or calcium.
Claims10
A composition comprising
- (a) about 15 to about 3,000 parts per million of an alkali metal or about 50 to about 3000 parts per million of magnesium or calcium, and
- (b) a liquid crystalline polymer consisting essentially of repeat units of the formulae ##STR2## wherein the molar ratio of (I):(II) is from 65:35 to 40:60,
- the molar ratio of (III):(IVa+IVb) is from 85:15 to 50:50,
- the molar ratio of the total of (I) and (II) to the total of (III) and (IV) is substantially 1:1, and
- there are 100 to 600 moles of (V) per 100 moles of (I) plus (II).
2 more elements
Dependencies are inferred from the claim text.