Abstract: An improved process for the preparation of tris-(.beta.-hydroxypropyl) isocyanurate by the reaction of propylene oxide with cyanuric acid. Propylene oxide and cyanuric acid are reacted at a temperature of between about 100.degree. and 150.degree. C. at an elevated pressure, and in the absence of a catalyst, in a reaction medium of a polyhydroxy compound which is a liquid at the reaction temperature and in which the tris-(.beta.-hydroxypropyl) isocyanurate is soluble or with which it is miscible.

Abstract: The invention disclosed is for new improved hydrophilic crosslinked polyurethane foams prepared by reacting a blend of a monomeric polyol and polyoxyalkylene glycol (the --OH groups of said blend being capped with a polyisocyanate) with large amounts of an aqueous reactant. The resultant foams may be characterized with a broad spectrum of improved properties including hydrolytic stability and tensile strength.

Abstract: A method for producing a urethane elastomer is disclosed. The method involves mixing benzotriazole or a tolyl triazole with an isocyanate terminated prepolymer while the prepolymer is at a temperature sufficiently high that it is a liquid. The proportion of benzotriazole or tolyl triazole used can range from 0.1 to 1.0 equivalent per equivalent of isocyanate in the prepolymer, and must be sufficient to increase the pot life of a mixture of the prepolymer with a diamine, but insufficient to cause substantial impairment of the physical properties of the cured elastomer. A substantially equivalent amount of a diamine is then mixed with the stabilized prepolymer, and the resulting composition is heated to produce the elastomer.

Abstract: A denture consisting of teeth anchored in a gum member composed of a unitary mass of non-hydrophilic polyurethane elastomer, the tooth-holding portion of which is hard and the mouth-engaging portion of which is soft is prepared by first casting the teeth-holding portion about the teeth and then casting the gum holding portion onto the tooth-holding portion and curing the denture during which the gum-engaging portion and the tooth-holding portion become integrally chemically bonded into a unitary mass.

Abstract: Oxazolidones are produced by reacting an organic isocyanate with an epoxide in the presence of a catalyst selected from the group consisting of dialkyl zinc, zinc carboxylate, organozinc chelate compound and trialkyl aluminum. Polyoxazolidones produced according to the present invention are useful starting materials for the manufacture of a wide variety of product including foams, coatings, adhesives, elastomers and the like.

Abstract: A denture consisting of teeth anchored in a gum member composed of a unitary mass of non-hydrophilic polyurethane elastomer, the tooth-holding portion of which is hard and the mouth-engaging portion of which is soft is prepared by first casting the teeth-holding portion about the teeth and then casting the gum holding portion onto the tooth-holding portion and curing the denture during which the gum-engaging portion and the tooth-holding portion become integrally chemically bonded into a unitary mass.

Abstract: Cyclic nitrile adducts are used as crosslinking agents for acrylic interpolymers to produce thermosetting resins having exceedingly high impact resistance. Adipodinitrile carbonate is a preferred cyclic nitrile.