Abstract: Described are catalyst compositions comprising a HAMS-1B crystalline borosilicate molecular sieve incorporated into an inorganic matrix, which have been impregnated with a magnesium compound or with both a phosphorus compound and a magnesium compound, said impregnated compositions having improved para-selectively for toluene alkylation. Such impregnated compositions, when used for the alkylation of toluene using methanol, methylether, ethylene, or propylene yield dialkylbenzene products containing a higher proportion of the para-isomer than corresponding unimpregnated borosilicate-based compositions. When toluene is alkylated with propylene using the impregnated catalyst compositions of this invention, a significant increase in para-selectivity among the cymene isomers is obtained at high total-cymene/n-propyltoluene ratios.

Abstract: An improved catalyst composition for isomerizing xylene containing a minor amount of ethylbenzene comprising a HAMS-1B crystalline borosilicate molecular sieve incorporated into an inorganic matrix impregnated with a small amount of a phosphorus compound. The catalyst composition when contacted with an ethylbenzene containing xylene under isomerization conditions results in a greater yield of paraxylene and a conversion of ethylbenzene to more useful products.

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: 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: 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 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 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: 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: 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 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, 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 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: 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.

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