Liquid crystalline poly(ester-amides)
AssigneeE. I. Du Pont de Nemours and Company
InventorsIrene Greenwald Plotzker, Joel David Citron, Marion Glen Waggoner
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Abstract
Disclosed herein are thermotropic liquid crystalline poly(ester-amides) containing repeat units derived from alipatic diamines and other monomers, such as aromatic diols, aromatic dicarboxylic acids, aromatic hydroxycarboxylic acids, and optionally aliphatic diols. The polymers are particularly useful as films and in multilayer structures as barrier layers because of their relatively low permeability to various compounds.
Claims20
A liquid crystalline poly(ester-amide) consisting essentially of the repeat units:
- (i) 100 molar parts, total, of 10 to 50 molar parts of -R.sup.1 NR.sup.2 NR.sup.1 -- (I), and 50 to 90 molar parts --OAr.sup.1 O-- (II);
- (ii) 100 molar parts of --(O)CAr.sup.2 C(O)-- (III);
- (iii) 50 to 200 molar parts of --OAr.sup.3 C(O)-- (IV);
- and
- (iv) 0 to 100 molar parts of --OR.sup.3 O(O)CAr.sup.4 C(O)-- (V);
- wherein:
- each R.sup.1 is independently hydrogen or alkyl;
- R.sup.2 is alkylene or substituted alkylene, each containing 4 to 16 carbon atoms;
- R.sup.3 is --(CH.sub.2).sub.n -- wherein n is 2 to 6;
- and
- each of Ar.sup.1, Ar.sup.2, Ar.sup.3 and Ar.sup.4 is independently arylene.
In a process for the preparation of a liquid crystalline poly(ester-amide) comprising repeat units at least some of which are derived from aliphatic diamines and at least some of which are derived from aromatic diols, and wherein said aromatic diols are polymerized in the form of their esters with aliphatic acids, an improvement comprising adding said aliphatic diamine to a polymerization vessel in the form of a solid derivative thereof which derivative is itself either polymerizable, or is converted in said polymerization vessel to a polymerizable compound.
Dependencies are inferred from the claim text.