Abstract: Disclosed are novel cross-linkable end-cappers for oligo- and polyimides. End-capped oligo- and polyimides comprising such an end-capper may be cured at a lower temperature compared to oligo- and polyimides end-capped with PEPA.

Abstract: We describe anhydride compounds suitable for physiologically labile modification of amine-containing molecules. The described anhydrides form reversible linkages having desirable kinetics for in vivo delivery of biologically active molecules. Also described are endosomolytic polymers formed by modification of membrane active polyamines with the described anhydrides.

Abstract: Disclosed is a method for manufacturing a trimellitic anhydride aryl ester in an efficient, high-yielding manner, wherein carboxylic acid lithium salt is used as a catalyst when a carboxylic acid aryl ester and trimellitic anhydride are caused to undergo an ester exchange reaction to manufacture a trimellitic anhydride aryl ester.

Abstract: Disclosed are novel cross-linkable end-cappers for oligo-and polyimides. End-capped oligo-and polyimides comprising such an end-capper may be cured at a lower temperature compared to oligo-and polyimides end-capped with PEPA.

Abstract: The present invention relates to cyclohexanes having carboxylate derivatives at the 1 and 4, and optionally the 2, position. The invention also relates to processes for preparing such compounds wherein a portion of the starting materials utililzed is derived from renewable resources.

Abstract: The present invention relates to novel substituted and unsubstituted terephthalic acid and carboxylate derivatives and products prepared therefrom having a significant renewable content. The invention also relates to processes for preparing substituted and unsubstituted terephthalic and carboxylate derivatives thereof wherein a portion of the starting materials utilized is derived from renewable resources. The invention also relates to novel cyclohexene based intermediates prepared in these processes and to conversion of these intermediates to substituted and unsubstituted cyclohexane-1,4-dicarboxylates and carboxylate derivatives thereof and novel forms of the resulting products having renewable content. The invention also relates to products prepared from substituted and unsubstituted terephthalic acid and carboxylate derivatives thereof derived from starting materials derived from renewable resources.

Abstract: The present invention provides an acid anhydride ester obtained by esterifying cyclohexane-1,2,4-tricarboxylic acid-1,2-anhydride and a composition of the ester, and a heat-curable resin composition and a cured product of the composition. _Provided is an epoxy resin composition using the acid anhydride ester as a curing agent for an epoxy resin, the epoxy resin composition having, for example, the following properties (1), (2), and (3): (1) the epoxy resin composition has a low viscosity at room temperature, so the components of the composition can be favorably blended with each other, (2) the acid anhydride ester has a low vapor pressure at curing temperature, so no evaporation loss occurs after curing, and the intended design of blend is capable, and (3) a cured product to be made from the composition is colorless and transparent, and changes its color to a small extent even when the product is irradiated with light or heated for a long time period.

Abstract: The present invention provides a useful and novel alicyclic polyesterimide. An alicyclic polyesterimide produced by imidation of an alicyclic polyesterimide precursor is found to be a useful material in industrial fields, the alicyclic polyesterimide precursor being obtained by reacting an alicyclic tetracarboxylic anhydride having an ester group or a class of tetracarboxylic acid thereof as a starting material with an amine.

Abstract: The present invention provides an acid anhydride ester obtained by esterifying cyclohexane-1,2,4-tricarboxylic acid-1,2-anhydride and a composition of the ester, and a heat-curable resin composition and a cured product of the composition. _Provided is an epoxy resin composition using the acid anhydride ester as a curing agent for an epoxy resin, the epoxy resin composition having, for example, the following properties (1), (2), and (3): (1) the epoxy resin composition has a low viscosity at room temperature, so the components of the composition can be favorably blended with each other, (2) the acid anhydride ester has a low vapor pressure at curing temperature, so no evaporation loss occurs after curing, and the intended design of blend is capable, and (3) a cured product to be made from the composition is colorless and transparent, and changes its color to a small extent even when the product is irradiated with light or heated for a long time period.

Abstract: A compound of the formula: ##STR1## wherein Ar.sup.

Abstract: Controlled molecular weight phenylethynyl terminated imide oligomers (PETIs) have been prepared by the cyclodehydration of precursor phenylethynyl terminated amic acid oligomers. Amino terminated amic acid oligomers are prepared from the reaction of dianhydride(s) with an excess of diamine(s) and subsequently endcapped with phenylethynyl phthalic anhydride(s) (PEPA). The polymerizations are carried out in polar aprotic solvents such as N-methyl-2-pyrrolidinone or N,N-dimethylacetamide under nitrogen at room temperature. The amic acid oligomers are subsequently cyclodehydrated either thermally or chemically to the corresponding imide oligomers. Direct preparation of PETIs from the reaction of dianhydride(s) with an excess of diamine(s) and endcapped with phenylethynyl phthalic anhydride(s) has been performed in m-cresol. Phenylethynyl phthalic anhydrides are synthesized by the palladium catalyzed reaction of phenylacetylene with bromo substituted phthalic anhydrides in triethylamine.

Abstract: The invention relates to new N-alkyl-N-(meth)acryloyloxyalkylcarboxamides of aromatic carboxylic acids and aromatic carboxylic acid anhydrides, their preparation and formulations of these compounds for use as adhesives for the treatment of dental hard substance.

Abstract: The invention relates to new N-alkyl-N-(meth)acryloyloxyalkylcarboxamides of aromatic carboxylic acids and aromatic carboxylic acid anhydrides, their preparation and formulations of these compounds for use as adhesives for the treatment of dental hard substance.

Abstract: Substituted benzophenones are disclosed having the following formula ##STR1## where R.sub.A and R.sub.B are --OH, C.sub.1 to C.sub.12 linear or branched alkoxy or taken together with the adjacent carbonyl carbons form an anhydride ring, R.sub.1 and R.sub.2 are the same or different and are hydrogen, C.sub.1 to C.sub.6 linear or branched alkyl, halo, aryl unsubstituted or substituted with one or more aryloxy groups or R.sub.1 and R.sub.2 taken together are (CH.sub.2).sub.x where x is an integer from 3 to 6 with the proviso that R.sub.1 and R.sub.2 cannot both be hydrogen.Processes to produce these benzophenones are also disclosed.

Abstract: Novel chromophor derivatives of cyclic anhydrides are provided which have the ability to react with a variety of organic substrates forming adducts which are useful in analytical techniques for the detection and measurement of biological compounds.

Abstract: Amino-tetraalkylbenzoylphthalic acids are intermediates for preparing homopolyimides and copolyimides which contain structural elements of the formula I ##STR1## in which R.sup.1 and R.sup.2 are halogen, nitro, aryl, aryloxy, alkyl or alkoxy, m is 0 or a number from 1 to 4, n is 0 or a number from 1 to 3 and p is 0, 1 or 2, the free carbonyl groups are bonded in the ortho-position relative to one another and R is a divalent aromatic radical which is substituted by at least one alkyl group or aralkyl group, are autophotocrosslinkable. They are suitable for the production of protective films and photographic relief images.

Abstract: Yield and assay (purity) improvements in the reaction of bromine and the Diels-Alder addition product of maleic anhydride and a conjugated diene in the presence of a nitrogenous acid acceptor are realized in the instant process. The heating time after completion of bromine addition is increased to more completely eliminate hydrogen bromide from the reaction medium and thereby drive the reaction to completion. Also, the type of catalyst selected for use is one which will yield a phthalimide by-product impurity having a boiling point which differs enough from the boiling point of the desired product to allow for distillative separation of the impurity and desired product.

Abstract: Reaction of an aromatic dianhydride with a polycyclic aromatic primary diamine at a controlled reaction rate yields a diamic acid dianhydride oligomer. The oligomer may be a precursor for an imide foam which forms at low temperature, has outstanding physical characteristics, and is extremely heat resistant. The diamic acid moiety may be converted to diimide, and other modifications of the oligomer are disclosed. Other derivatives of the oligomers are also disclosed.