Back to results
US 4,731,432 AGranted
Completely aromatic polyesters and their preparation
AssigneeBASF SE
InventorMichael Portugall
Life of this patent
Estimating the term…
Abstract
Completely aromatic polyesters which form a liquid-crystalline filament-forming melt at below 300.degree. C. and essentially consist of (a) from 3 to 15 mol % of units derived from hydroquinone, (b) from 5 to 35 mol % of units derived from 2,7-dihydroxynaphthalene, (c) molar amounts, equivalent to the sum of (a) and (b), of units derived from terephthalic acid, and (d) from 10 to 70 mol % of units derived from p-hydroxybenzoic acid, and their preparation.
Claims6
A completely aromatic polyester which forms a liquid-crystalline filament forming melt at below 300.degree. C. and consists essentially of
- (a) from 3 to 15 mol% of units having the structural formula ##STR8## (b) from 5 to 35 mol% of units having the structural formula ##STR9## (c) molar amounts, equivalent to the sum of (a) and (b), of units having the structural formula ##STR10## (d) from 10 to 39.4 mol% of units having the structural formula ##STR11##
Dependencies are inferred from the claim text.