Abstract: Novel melt-spinnable anisotropic-melt-forming polyesters from certain disubstituted hydroquinones and terephthalic acid have high glass transition temperatures.

Abstract: Novel melt-spinnable anisotropic-melt-forming polyesters from certain disubstituted hydroquinones and terephthalic acid have high glass transition temperatures.

Abstract: Polypyromellitimide filaments having high strength and high modulus are obtained by dry-spinning a solution of polyamide-acid of polypyromellitic dianhydride, 3,4'-oxydianiline and paraphenylenediamine, substituted derivatives thereof or 4,4'-diaminobiphenyl or 4,4'-diaminobenzanilide, then converting the polyamide-acid to the polyimide and drawing.

Abstract: Copolyesters useful for fibers from certain monosubstituted hydroquinones, terephthalic acid and certain substituted benzophenones.

Abstract: Copolyesters useful for fibers from hydroquinone, hydroxybenzoic acid or 6-hydroxy-2-naphthoic acid, 3,4'-dicarboxydiphenyl ether and optionally isophthalic acid or resorcinol.

Abstract: Copolyesters useful for fibers from certain monosubstituted hydroquinones, terephthalic acid and certain disubstituted diphenyl ethers.

Abstract: Copolyesters useful for fibers from hydroquinone, 3,4'-dicarboxydiphenyl ether and from 10 to 20 mole % of a member of the group consisting of terephthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-bibenzoic acid, 2,6-naphthalenediol and 4,4'-dihydroxydiphenyl.

Abstract: Chlorination of hydroquinone by reacting sulfuryl chloride with a slurry or solution of hydroquinone in glacial acetic acid can yield a mixture containing a major proportion of monochlorohydroquinone.

Abstract: A process for preparing thermoset polymer spheres by polymerizing a thermosettable polymer such as a vinyl ester resin or an unsaturated polyester resin in water containing a suspending agent in the presence of a catalyst and an accelerator is improved by employing an organic suspending agent as the suspending agent.

Abstract: High modulus filaments are melt-spun from polyimide-esters derived from I 6-hydroxy-2-naphthoic acid, a diphenol and 4-carboxy-N-(p-carboxyphenyl)-phthalimide; II 6-hydroxy-2-naphthoic acid, an aromatic dicarboxylic acid 4-hydroxy-N-(p-hydroxyphenyl)phthalimide; or III 6-hydroxy-2-naphthoic acid, 4-hydroxybenzoic acid and 4-carboxy-N-(p-hydroxyphenyl)phthalimide. The polyimide esters are optically anisotropic in the melt. As-spun filaments from these polymers can be heat treated while free from tension to increase their tenacity.

Abstract: Copolyesters useful for fibers having high elongation and modulus contain minor amounts of ##STR1## units where Y is oxygen or carbonyl.

Abstract: Fiber-forming aromatic polyester consisting essentially of 1,4-dioxyphenylene units, lower alkyl or halo-1,4-dioxyphenylene units, terephthaloyl units and 3-carbonyl-4'-oxybenzophenone or 4-carbonyl-4'-oxybenzophenone units or chloro- and/or methyl substituted homologs of these.

Abstract: An aromatic polyester consisting essentially of (1) p-oxybenzoyl units or the 3-methyl- or 3-chloro-derivatives thereof; (2) 3,4'-dioxydiphenylether or 3,4'-dioxybenzophenone units or the 3'-methyl- or 3'-chloro- derivatives thereof or terephthaloyldi (3-methyl-4-oxybenzene) units; and (3) terephthaloyl units and filaments thereof.

Abstract: High modulus filaments are melt-spun from polyesters which are derived from 3,4'-dihydroxybenzophenones or 3-hydroxy-4'-(4-hydroxyphenyl-)benzophenone and terephthalic, 2,6-naphthalene dicarboxylic, or bibenzoic acid. The polyesters are optically anisotropic in the melt. As-spun filaments from these polyesters can be heat treated while free from tension to increase their tenacity.

Abstract: An aromatic polyester consisting essentially of p-oxybenzoyl units or the 3-methyl or 3-chloro-derivatives thereof, 4,4'-dioxybenzophenone units or the 3-methyl- or 3-chloro- derivatives thereof, terephthaloyl units and optionally 1,4-dioxyphenylene units.

Abstract: Fiber-forming aromatic polyester consisting essentially of p-oxybenzoyl units or the 3-methyl or 3-chloro derivatives thereof, 4-oxy-3'-carboxybenzophenone units or the 3-methyl or 3-chloro derivatives thereof, 1,4-dioxyphenylene and terephthaloyl units.

Abstract: An aromatic polyester which in filament form has improved responsiveness to heat strengthening consisting essentially of p-oxybenzoyl units, terephthaloyl units, 2,6-dioxynaphthalene or 2,6-dioxyanthraquinone units and m-oxybenzoyl, or 1,3-dioxyphenylene units.

Abstract: High modulus filaments are melt-spun from polyimide-esters derived from 2,6-naphthalene dicarboxylic acid and either a substituted diphenol and 4-(4'-carboxyphthalimido)benzoic acid or terephthalic acid and 4-(4'-hydroxyphthalimido)phenol. The polyimide esters are optically anisotropic in the melt. As-spun filaments from these polymers can be heat treated while free from tension to increase their tenacity.

Abstract: An improved process for spinning flame-resistant acrylonitrile polymer fibers wherein 33-43% by weight (preferably 35-40% by weight) of a chlorinated acyclic hydrocarbon containing 60-73% (preferably 66-70%) by weight chlorine and 57-67% (preferably 60-65%) by weight of an acrylonitrile polymer having an intrinsic viscosity of 1.6-3 (preferably 1.8-2.2) is dissolved in a suitable solvent to form a solution containing 25-31% by weight solids which solution is extruded under conventional dry spinning conditions to give fibers which are extracted, drawn and dried. Optionally, the spinning solution also contains 0.5-6% (preferably about 3%) by weight antimony trioxide based on total solids.