Abstract: Segmented thermoplastic polyester-amides are described which are prepared by reacting a polymeric diol (molecular weight in the range of 400 to 4000) with a carboxylic acid terminated prepolymer obtained by reacting an aliphatic ether diamine, optionally in admixture with a minor proportion (based on equivalents) of an alkylene diamine, with an excess of dicarboxylic acid (aromatic or aliphatic). The polyester-amides, which can be prepared preferably by the melt condensation method, have excellent physical properties and resistance to degradation by heat.

Abstract: Novel liquid organic polyisocyanate compositions are disclosed which are obtained by reacting a carbodiimide-containing organic polyisocyanate with a carboxylic acid terminated butadiene-acrylonitrile low molecular weight copolymer in the proportions of from about 2 to about 30 parts of the copolymer per 100 parts of the polyisocyanate provided there is from about 0.01 to about 0.5 carboxylic acid equivalent per equivalent of carbodiimide.The liquid polyisocyanates are particularly useful in providing hard glassy polyurethanes having improved impact strengths.

Abstract: Novel polymer blends are disclosed comprising about 10 to 95 percent by weight of a copolyimide (A) prepared from benzophenone-3,3',4,4'-tetracarboxylic acid dianhydride and a mixture of 4,4'-methylenebis(phenyl isocyanate) and toluene diisocyanate (2,4- or 2,6-isomer or mixtures thereof) with the isocyanates used in a molar percent ratio from about 10/90 to 30/70 respectively; and from about 90 to 5 percent by weight of a copolyamideimide (B) prepared from 4,4'-methylenebis(phenyl isocyanate) and a mixture of trimellitic anhydride and isophthalic acid with the acid components used in a molar percent ratio from about 70/30 to 90/10 respectively.The novel blends may be used in the form of their dry blend or in solution and the films produced therefrom are characterized by improved elongation and tear strength values over those for the copolyimide (A) alone. Furthermore, the softening point of the blends is increased over the copolyamideimide alone.

Abstract: Novel copolyoxalamides having the recurring unit ##STR1## are disclosed wherein R is a divalent aromatic radical and R.sub.1 is a divalent radical selected from the group consisting of 2,2,4- and 2,4,4-trimethylhexylene, ##STR2## and mixtures thereof. The novel copolyoxalamides are injection-moldable, thermoplastic materials which are characterized by good high temperature resistance and excellent resistance to oxidative degradation.

Abstract: An improved process is described for the reaction of an isocyanate (mono or poly) with a carboxylic acid or anhydride (mono or poly) to form the corresponding imide, amide or amide-imides. The improvement lies in using as the catalyst the 1-oxide, 1-sulfide or 1-hydrocarbylimino derivative of a phospholene, phospholane or phosphetane. The latter compounds are also substituted in the 1-position by a hydrocarbyl (C.sub.1-12) or halohydrocarbyl (C.sub.1-12) and may additionally carry one or more halo, lower-alkoxy, phenoxy, lower-hydrocarbyl or halo-substituted hydrocarbyl groups on the ring carbon atoms.

Abstract: Novel solvent soluble and injection moldable copolyamideimides are disclosed that are characterized in that from about 30 percent to about 70 percent of the recurring units are ##STR1## and in the remaining 30-70 percent of the recurring units are ##STR2## wherein C.sub.n H.sub.2n represents alkylene from 7 to 12 carbon atoms, inclusive, and Ar is ##STR3## where X = --SO.sub.2 --, --CO--, --O--, or alkylene (C.sub.1-4). The copolyamideimides are further characterized by ease of melt processing such as by extruding or injection molding while at the same time prossessing good high temperature stability and unexpectedly high impact and tensile yield strengths.

Abstract: Random copolymers of polyparabanic acids and polyamide-imides are described. The copolymers are highly useful engineering thermoplastics which, unlike the corresponding polyparabanic acid homopolymers, are readily moldable by compression molding and like techniques. The copolymers are readily prepared by the one-shot reaction of bis(alkoxyoxalyl)amides of aliphatic, araliphatic or aromatic diamines, with organic diisocyanates and trimellitic anhydride.

Abstract: Polyamideimides are described which are derived by conventional procedures from particular 1,1-cycloaliphatic bis(phenylamine) compounds (or the corresponding diisocyanates) and trimellitic acid (preferably through the anhydride acid chloride). The polyamideimides are engineering thermoplastics characterized by the combined properties of solubility, melt processability, and resistance to thermal oxidation.

Abstract: Random copolymers of polyparabanic acids and polyamides are described. The copolymers are highly useful engineering thermoplastics which, unlike the corresponding polyparabanic acids alone, are readily moldable by extrusion, injection molding and like techniques. The copolymers are readily prepared by a one-shot reaction of (i) bis(alkoxyoxalyl)amides of aliphatic, araliphatic or aromatic diamines, (ii) aromatic or aliphatic dicarboxylic acids, and (iii) organic diisocyanates.

Abstract: Novel copolyamides having the recurring unit ##STR1## are disclosed wherein, in about 30 percent to about 60 percent of the recurring units, R is --CH.sub.2).sub.x wherein x is an integer from 7 to 12 inclusive, and, in about 40 percent to about 70 percent of the recurring units, R is m-phenylene; Ar in about 70 percent to about 95 percent of the recurring units is 4,4'-methylenebis(phenylene) and in the remaining 5 to 30 percent is a tolylene radical; and provided that when at least about 50 percent of R is m-phenylene Ar is at least 10 percent tolylene and further provided that said tolylene radicals are present in said copolyamide substantially as polyamide blocks with at least said m-phenylene radicals.The copolyamides are highly amorphous and characterized by high glass transition temperatures. They are easily injection molded with no brittle fracture occurring and yield polymer articles, having high impact and tensile strengths along with excellent elongation and clarity.