Abstract: The present invention is a rigid thermoplastic polyurethane having a T.sub.g of at least 50.degree. C. having a sufficient concentration of units derived from an aromatic diol to lower the temperature at which the rigid thermoplastic polyurethane can be melt processed. The present invention is also a thermoplastic polyurethane with a flex modulus of at least 100,000 psi, and having a sufficient concentration of units derived from an aromatic diol to lower the temperature at which the thermoplastic polyurethane can be melt processed. The compositions of the present invention show improved processability with insubstantial loss of physical properties.

Abstract: A dual durometer thermoplastic polyurethane or thermoplastic polyurethane-containing handle suitable for human grip provides both mechanical strength and chemical resistance and can be prepared without the use of adhesives.

Abstract: Blends are disclosed of a clear polyurethane plastic and a minor amount (up to 30 parts by weight per 100 parts by weight of blend) of an incompatible polymeric impact modifier. The resulting blends exhibit properties (high impact resistance, high flexural modulus and resistance to heat) comparable to those of engineering plastics such as nylon.

Abstract: A novel aliphatic diisocyanate, namely 1,4-bis(2-isocyanatoethyl)cyclohexane, is disclosed. Polyurethanes derived from this diisocyanate exhibit advantageous properties. Illustratively, polyurethane elastomers prepared from the above diisocyanate, a polymeric diol and a low molecular weight diol extender, possess significantly improved resilience properties and are useful in the preparation of automobile bumpers, fenders and the like.

Abstract: A novel aliphatic diisocyanate, namely 1,4-bis(2-isocyanatoethyl)cyclohexane, is disclosed. Polyurethanes derived from this diisocyanate exhibit advantageous properties. Illustratively, polyurethane elastomers prepared from the above diisocyanate, a polymeric diol and a low molecular weight diol extender, possess significantly improved resilience properties and are useful in the preparation of automobile bumpers, fenders and the like.

Abstract: A melt-polymerization process is described for the preparation of thermoplastic polyamides and polyesteramides by reaction of the appropriate organic diisocyanate and dicarboxylic acid or difunctional carboxylic acid-terminated polyol. The process, which can be conducted in a batch or continuous manner, comprises the steps of admixing the reactants (preferably in the liquid state), heating the mixed reactants at reaction temperature in a manner such that eliminated carbon dioxide can be vented freely, allowing the reaction to proceed until approximately 25-95 percent (preferably at least 50 percent) of the theoretical carbon dioxide has been eliminated and reducing the resulting intermediate to a powder before completing the reaction by melting, homogenizing, and devolatilizing.

Abstract: A continuous, solvent-free process is described for the preparation of thermoplastic polyamides and polyester-amides by the reaction of the appropriate organic diisocyanate and dicarboxylic acid or difunctional carboxylic acid-terminated polyester.

Abstract: Improved thermoplastic polyurethane elastomers are disclosed which are the reaction product of 4,4'-methylene-bis(phenyl isocyanate); a polymeric diol; and an extender wherein the equivalent proportions of said diol to said extender fall within the range of about 1:2 to about 1:20 and the isocyanate to total hydroxyl equivalents are within the range of about 0.99:1 to 1.06:1, the improvement which comprises replacing at least about 15 percent by weight of said polymeric diol by a polyol selected from the class consisting of: (i) polyoxypropylene-polyoxyethylene glycols having a molecular weight of about 3500 to about 4500 and an ethylene oxide content of about 10 to about 60 percent by weight; (ii) polyoxypropylene-polyoxyethylene triols having a molecular weight from about 5000 to about 7000 and an ethylene oxide content of about 10 to about 40 percent by weight; and (iii) mixtures of (i) and (ii).

Abstract: Novel thermoplastic polyester polyurethanes are disclosed which are obtained by reacting a polyester diol, a difunctional extender, a methylenebis(phenyl isocyanate), and from about 0.0025 mole to about 0.03 mole per equivalent of isocyanate of a monocarbodiimide product derived from a methylenebis(phenyl isocyanate) or the corresponding uretidinedioneimine adduct thereof with said latter methylenebis(phenyl isocyanate).The polyester polyurethanes are characterized by a combination of thermoplasticity, extremely good hydrolytic stability which cannot be diminished by solvent action, good physical properties, particularly tensile strength and elongation, and enhanced clarity of molded articles.