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

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.

Abstract: Molybdenum compounds, particularly molybdenum sulfide, molybdenum silicide, molybdenum selenide and molybdenum telluride are useful Friedel-Crafts catalysts for the aralkylation of aromatics to produce polybenzyls, the manufacture of aromatic ketones, aromtic sulfones and aromatic esters. The reaction products are useful as laminates, herbicides and bactericides.

Abstract: Molybdenum compounds, particularly molybdenum sulfide, molybdenum silicide, molybdenum selenide and molybdenum telluride are useful Friedel-Crafts catalysts for the aralkylation of aromatics to produce polybenzyls, the manufacture of aromatic ketones, aromatic sulfones and aromatic esters.The foregoing processes are carried out at a temperature of about 60.degree. to 250.degree. C. and at a catalyst concentration of about 0.1 to 15% by weight of reactants. The reaction products are useful as laminates, herbicides and bactericides.

Abstract: This invention relates to copolyimides-polyamides prepared from mixtures of tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride (TMCDA), aromatic or aliphatic dianhydrides, and dicarboxylic acids or their esters or acid chlorides. These dianhydride-dicarboxylic acid mixtures are then reacted with aliphatic or aromatic diamines. These novel copolyimides-polyamides are useful in the preparation of molded articles, fibers, films, laminates and coatings.

Abstract: Novel polyimide-amide polymers and copolymers and molding compositions are prepared from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride, dicarboxylic acids and mixtures of diamines. Also glass and graphite filled polymers are prepared. The polyimide-polyamide polymers and copolymers are useful as engineering plastics.

Abstract: Process for the concurrent synthesis of benzophenone, anthraquinone, and o-dibenzoylbenzene by pyrolysis of benzoic acid salts of yttrium, erbium, and dysprosium and mixtures thereof at temperatures of from about 200.degree. C. to 500.degree. C. and a pressure of about 0.1 to about 100 atmospheres. In an alternative method, a benzoic acid compound is passed through an oxide of yttrium, erbium, dysprosium and mixtures thereof in the presence of steam.

Abstract: Novel polyimides, copolyimides 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. The novel polyimides are useful as engineering plastics. The novel dianhydrides are useful for the preparation of the polyimides. Other dianhydrides can be mixed with our novel dianhydrides to make novel copolyimides useful as engineering plastics.

Abstract: This invention relates to novel polyimides-polyamides and copolyimides-polyamides prepared from the novel nonaromatic dianhydrides or mixtures of these with other dianhydrides. Tricyclo [4.2.1.0.sup.2,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride (I). I is used to prepare novel polyimides-polyamides which are useful in preparing molded articles, fibers, laminates and coatings.

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: 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 tetramethycyclobutane 1,2,3,4-tetracarboxylic dianhydride and diamines are disclosed.

Abstract: Disclosed are adducts of 1-cyclohexene-1,2-dicarboxylic anhydride with olefins and preparation thereof by reacting an olefinically unsaturated compound and 1-cyclohexene-1,2-dicarboxylic anhydride using actinic radiation as an energy source at a temperature of from -30.degree. C. to 150.degree. C., preferably at from about 25.degree. C. to 100.degree. C. Derivatives of these compounds are useful as rust inhibitors in gasoline.

Abstract: Novel copolyimides are prepared from mixtures of tetramethyl-cyclobutane-1,2,3,4-tetracarboxylic dianhydride and other aliphatic and aromatic dianhydrides. Their dianhydride mixtures are reacted with aliphatic or aromatic diamines to form copolyimides which are useful as engineering plastics.

Abstract: Novel polyimides, copolyimides and molding compositions are prepared from novel dianhydrides such as bicyclo[4.2.0]octane-2,5 diphenyl-7,8-dimethyl,3,4,7,8-tetracarboxylic dianhydride and bicyclo[4.2.0]octane-7,8-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride. The novel polyimides are useful as engineering plastics. The novel dianhydrides are useful for the preparation of the polyimides.

Abstract: Novel polyimides and molding compositions are prepared from tricyclo[6.4.0.0.sup.2,7 ]dodecane-1,8,2,7-tetracarboxylic acid dianhydride. Also a novel dianhydride-,tricyclo[6.4.0.0.sup.2,7 ]dodecane-1,8,2,7-tetracarboxylic acid dianhydride is prepared by a novel photodimerization of 1-cyclohexene-1,2-dicarboxylic anhydride. The polyimides are useful as engineering plastics.

Abstract: Novel polyimides and molding compositions are prepared from novel tricyclo[4.2.1.0.sup.2,5 ] nonane-3,4 dimethyl-3,4,7,8-tetracarboxylic acid dianhydride. The dianhydride is useful for the manufacture of polyimides which are useful as engineering plastics.

Abstract: A thiocarbamate compound selected from the group of thiocarbamate compounds consisting of 1,3,4-thiadiazole-2-thiol-5- monothiocarbamate; 1,3,4-thiadiazole-2,5-dithiocarbamate; 1,3,4-thiadiazole-2-thiol-5-mono(dithiocarbamate) and 1,3,4-thiadiazole-2,5-di(dithiocarbamate). These thiocarbamate compounds can be represented by the general formula ##STR1## where R' is a monovalent radical individually selected from the group consisting of a hydrogen radical and the radical ##STR2## wherein X is selected from the group consisting of .dbd.O and .dbd.

Abstract: Novel polyimides, copolyimides 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. The novel polyimides are useful as engineering plastics. The novel dianhydrides are useful for the preparation of the polyimides. Other dianhydrides can be mixed with our novel dianhydrides to make novel copolyimides useful as engineering plastics.

Abstract: Novel polyimides and molding compositions are prepared from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride and diamines. Also glass and graphite filled polyimides are prepared. The polyimides are useful as engineering plastics.