Abstract: The present invention relates to heat-curable, cyclic isocyanate addition productsi) which are the reaction products of a polyisocyanate having two or more isocyanate groups with a compound containing two or more isocyanate-reactive groups andii) in which at least 10% by weight of the reaction products are in the form of cyclic groups containing urea and/or urethane groups.The present invention also relates to a process for the preparation of these cyclic isocyanate addition products and to the products obtained by curing these compositions at elevated temperatures, e.g., coatings, adhesives, molded articles, elastomers and foams.

Abstract: A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a polycyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonates are, by the inventive process, inserted into the structure of the polymer, effecting branching of the molecular structure, a branching which manifests itself in the modified properties of the resin.

Abstract: The present invention relates to heat-curable, cyclic isocyanate addition productsi) which are the reaction products ofa) a polyisocyanate component having an average isocyanate functionality of two or more and a uretdione group content (calculated as N.sub.2 C.sub.2 O.sub.2, MW 84) of 1 to 30%, based on the weight of the polyisocyanate component, withb) a compound containing two or more isocyanate-reactive groups andii) in which at least 10% by weight of the reaction products are in the form of cyclic groups containing urea and/or urethane groups. The present invention also relates to a process for the preparation of these cyclic isocyanate addition products and to the products obtained by curing these compositions, optionally in the presence of other isocyanate-reactive compounds, at elevated temperatures, e.g., coatings, adhesives, molded articles, elastomers and foams.

Abstract: A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a cyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonate which may include any of a variety of functional groups may, by the inventive process, be inserted into the structure of the polymer, effecting a modification to the structure and the properties of the resin. Among the disclosed beneficial modifications thus imparted to the resin are improved thermal stability, altered rheology and optical properties.

Abstract: A compatibilized thermoplastic molding composition containing polyurethane and polyolefin resins is disclosed. Accordingly, a particularly structured copolymer having a number average molecular weight of about 25,000 to 350,000 and containing blocks of monoalkylene arene and either hydrogenated conjugated diene or non-hydrogenated conjugated diene, was found to compatibilize the composition. Articles molded from the composition are characterized by their good mechanical properties.

Abstract: Block copolymers represented by the formula ##STR1## are formed by contacting an ester group containing poly(aryl ether ketone) composed of the recurring units ##STR2## with a liquid crystalline polyester represented by the formula ##STR3## in which R.sub.1, R.sub.2 X.sub.2, X, Z, E.sup.1, E.sup.2 E.sup.5, w, x, y, z a, b and n each represent specified groups or values under conditions such that a transesterification reaction will occur.

Abstract: A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a cyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonate which may include any of a variety of functional groups may, by the inventive process, be inserted into the structure of the polymer, effecting a modification to the structure and the properties of the resin. Among the disclosed beneficial modifications thus imparted to the resin are improved thermal stability, altered rheology and optical properties.

Abstract: A thermoplastic, resinous mixture, useful in the preparation of compatible blends of polyurethane with polyolefins, is disclosed. The mixture contains(i) a thermoplastic polyurethane, and(ii) an agent which is the product of the reaction between a polyamide and a modified polyolefin.The inventive mixture may be used as a component in thermoplastic molding compositions which contain a polyolefin, preferably polypropylene. Improved mechanical properties characterize the molding compositions thus prepared.

Abstract: A thermoplastic copolycarbonate resin having improved low temperature impact strength and a process for the preparation of the resin are disclosed. Accordingly the structure of the copolycarbonate contains(i) units of the formula ##STR1## wherein D is a divalent residue of a dihydroxy compound, and (ii) units of the formula ##STR2## wherein m is 1-90, n is 5-300, R is an alkyl or a phenyl radical p is 2-12 and q is 2-20. The preparation of the copolycarbonate entails reactive blending of polycarbonate with a suitable lactone siloxane copolymer in the presence of a transesterification catalyst.

Abstract: A gamma radiation-resistant polycarbonate-disulfide resin is disclosed. The incorporation of disulfide linkages in the structure of polycarbonate was found to enhance the resistance of the resin to the discoloration caused by exposure to gamma radiation. Accordingly, processes for the incorporation of disulfide linkages in the molecular backbone, as end-groups or as side chains are disclosed. The polycarbonate-disulfide resin may be used as a molding resin in the context of thermoplastic molding compositions as well as a stabilizing additive in polycarbonate resin.

Abstract: A two step process for the preparation of an ester group-containing polyether sulfone is disclosed. In the first step a dihalogenodiphenyl sulfone is reacted with excess amount of an aromatic dihydroxy compound and in a second step the reaction product is reacted with a dicarboxylic acid derivative. The excess amount of the aromatic dihydroxy compound is that amount which is sufficient to react with said derivative to form the corresponding ester. The process of the invention is characterized by its economics and good yield and by the high purity of the product. The thus produced polyether sulfone is useful as a thermoplastic resin and as a reactant in the melt blending process for the preparation of block copolymers.

Abstract: A block copolymer represented by the formula ##STR1## are formed by contracting an ester group containing poly(aryl ether) composed of the recurring units ##STR2## with a polyarylcarbonate composed of the recurring units ##STR3## in which B, Z, E.sup.5, E.sup.1, E.sup.2 x, y, n and p represent specified groups or valuesunder conditions such that ester/carbonate interchange reactions will occur.

Abstract: A dihalobenzenoid compound is reacted with a dihydric phenol containing an azo group in the presence of a base, an organic solvent and an azeotrope former. Dihydric phenols which do not contain azo groups may also be included in the reaction mixture. This reaction is generally carried out at a temperature of from about 20.degree. to about 250.degree. C. under an inert atmosphere. The polyether obtained is represented by the formula[--O--[E--O].sub.z --E'].sub.x [O--E"--O--E'--].sub.yin which E, E', E", x, y and z have the meaning specified herein.