Abstract: A thermal process for the decarboxylation and dehydration of aromatic acid residue to convert such residue to grindable form and recover the solvent of reaction therefrom.

Abstract: A novel catalyst for the oxidation of butane to produce maleic anhydride comprising a phosphorus and vanadium mixed oxide wherein the catalyst is prepared by using P.sub.2 O.sub.5 in an organic medium wherein the catalyst is not precipitated. The catalyst has a specific phase identified by a characteristic X-ray diffraction pattern. A process for the manufacture of the catalyst and a process for the manufacture of maleic anhydride from butane feedstock utilizing the novel catalyst is disclosed. Maleic anhydride is a well-known industrial chemical used in the manufacture of polyester, and maleic anhydride also has utility as a food stuff.

Abstract: Novel crystalline copolymers having heat deflection temperatures in excess of 305.degree. C. and prepared from hexamethylene diamine, trimethylhexamethylene diamine and either mixtures of terephthalic acid and adipic acid or mixtures of terephthalic acid, isophthalic acid and adipic acid. The high heat deflection of these polyamides enables them to be used in applications such as a hood for an automobile, a shroud for a lawn mower, chain saw guards and in electrical connection applications.

Abstract: Novel polyoxadiazoles soluble in m-cresol are disclosed. Also fibers, films, coatings and molded objects made therefrom. The copolyoxadiazoles are prepared from 5-t-butylisophthalic acid and N,N'-aliphatic or aromatic hydrocarbon radicals (4-carboxyphthalimide), when coreacted with either terephthalic acid or isophthalic acid or a mixture of terephthalic acid and isophthalic acid.

Abstract: Flow properties of polyamide-imide polymers are improved by the addition of amorphous polyamides. These polymers are useful as engineering resins, laminates, and molded objects.

Abstract: Novel copolymers and molding compositions are prepared from acyl halide derivatives of dicarboxylic acids, acyl halide derivatives of tricarboxylic aromatic anhydrides and aromatic diamines and about 1 to about 10 percent by weight of phthalic anhydride moieties. Also, glass filled copolymers are prepared. The copolymers are useful as engineering plastics.

Abstract: Injection moldable homopolymers, copolymers, and terpolymers are prepared from fully or partially acylated aromatic diamines, aliphatic diamines or a mixture of these and aromatic tricarboxylic anhydride compounds or mixtures of tricarboxylic anhydrides and dicarboxylic acids. These polymers are improved by the addition of calcium moieties such as oxide, calcium acetate and calcium hydroxide. These polymers are useful for the preparation of injection molded articles.

Abstract: Tendency of smooth particles of a size to pneumatically fluidizing from plugging metal transfer conduits is overcome by changing the geometry a portion, at least 10 weight percent of the particles to jagged, rough or sharp particles, as by grinding and blending the changed geometry particles with the remaining smooth particles.

Abstract: Fiber-grade quality terephthalic acid can be obtained by dissolving partially purified terephthalic acid: the product separated from catalyst components and impurities in acetic acid solvent portion of oxidation effluent, acetic acid washed and dried: either in deionized water or acetic acid at temperatures from 250.degree. C. and upward, contacting the solution and hydrogen gas with a hydrogenation catalyst preferably a platinum family metal disposed on an insoluble support followed by separation of the solution from catalyst, cooling the separated solution to precipitate terephthalic acid, recovering, washing and drying the precipitate. The use of deionized water in the purification route, with respect to the oxidative preparation of terephthalic acid, has the drawback of maintaining two distinctly different solvent systems and tolerating the rather limited water solubility of the p-toluic acid.

Abstract: A catalyst for the oxidation of hydrocarbons comprising a phosphorus and vanadium mixed oxide wherein the catalyst prepared by using an organic medium can be recycled according to our process thus conserving up to ninety percent of the vanadium used in the preparation of the catalyst. The mixed oxide can also be promoted by a transitional element of the IV and V period of the periodic table. These catalysts are particularly useful for the oxidation of C.sub.4 hydrocarbons to maleic anhydride.

Abstract: Novel glass and graphite filled copolyimides and polyimides useful as engineering plastics are prepared. Also fibers and oriented fibers from the copolyimides and polyimides derived from tetramethylcyclobutane 1,2,3,4-tetracarboxylic dianhydride and diamines are disclosed.

Abstract: Novel Poly[N,N'-(alkyl or aryl)-bis(4,4'-phthalimido)-1,3,4-oxadiazole-2,5-diyls], compositions for fibers, films, coatings and molded objects featuring high strength and high thermal properties with formulation advantages.

Abstract: Novel rust inhibitors for hydrocarbon fuels and oils are provided. Also, novel photo-adducts of dimethylmaleic anhydride and olefins useful as rust inhibitors.

Abstract: Injection moldable amide-imide homopolymers and copolymers containing titanates. These amide-imides are useful in engineering plastic applications.

Abstract: Novel polyamides are prepared for itaconic acid, other diacids and diamines. These polyamides are useful as molded objects, fibers, films, laminates and coatings.

Abstract: Novel polyamides are prepared from itaconic acid and diamines. These polyamides are useful as molded objects, fibers, films, laminates and coatings.

Abstract: A novel catalyst for the oxidation of butane to produce maleic anhydride comprising a phosphorus and vanadium mixed oxide wherein the catalyst is prepared by using P.sub.2 O.sub.5 in an organic medium wherein the catalyst is not precipitated. The catalyst has a specific phase identified by a characteristic X-ray diffraction pattern. A process for the manufacture of the catalyst and a process for the manufacture of maleic anhydride from butane feedstock utilizing the novel catalyst is disclosed. Maleic anhydride is a well-known industrial chemical used in the manufacture of polyester, and maleic anhydride also has utility as a food stuff.

Abstract: A process for the manufacture of a phosphorus/vanadium/metal oxide catalyst suitable for the oxidation of butane to maleic anhydride can be prepared by reacting in an aqueous medium a vanadium compound, inorganic acid and metal oxide, then adding orthophosphoric acid to form a soluble vanadium phosphorus metal oxide catalyst, removing the acidified water and adding an aliphatic alcohol, removing the alcohol and recovering under vacuum the solid phosphorus vanadium metal oxide catalyst.

Abstract: A process for the manufacture of a phosphorus/vanadium/metal oxide catalyst suitable for the oxidation of butane to maleic anhydride can be prepared by reacting orthophosphoric acid in an aliphatic alcohol and reacting a vanadium compound with an acid and the metal in the aliphatic alcohol to produce the phosphorus/vanadium/metal oxide catalyst.

Abstract: Novel polyimides and polyimides-amides, and molding compositions are prepared from novel dianhydrides such as tricyclo[6.4.0.0.sup.2,7 ] dodecane-3,6-diphenyl-1,8,4,5-tetracarboxylic acid dianhydride and tricyclo [6.4.0.0.sup.2,7 ] dodecane-1,8,4,5-tetracarboxylic acid dianhydride, dicarboxylic acids and diamines. The novel polyimides and polyimides-amides are useful as engineering plastics.