Abstract: Liquid crystalline polyesters made from hydroquinone, terephthalic acid, 2,6-naphthalene dicarboxylic acid and 4-hydroxybenzoic acid, and having a selected composition range, have melting points of about 350.degree. C. or less, good physical properties, and are readily manufactured. The polymers are useful as molding resins.

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.

Abstract: A toughened polyamide blend which exhibits improved toughness at exceptionally low temperatures can be prepared from:(A) 60 to 90 weight percent of a polyamide matrix resin; and(B) 10 to 40 weight percent of a rubber component including:(1) a functionalized rubber selected from ethylene/propylene copolymers and ethylene/propylene/diene terpolymers, and(2) an ethylene copolymer of the formula E/X/Y whereinE is a radical formed from ethylene and is 40 to 90 weight percent of the ethylene copolymer,X is an acrylate ester of an alcohol having 1 to 10 carbon atoms and is 10 to 80 weight percent of the ethylene copolymer, andY is selected from glycidyl methacrylate and glycidyl acrylate and is 0.5 to 10 weight percent of the ethylene copolymer.

Abstract: Dielectric powder compositions of certain alkaline earth metal zirconates and/or aluminates plus a glass, useful for forming dielectric layers in multilayer electrode/dielectric structures on an alumina substrate. Also, dispersions of such compositions in a vehicle and the resultant multilayer structures.