Abstract: A super-soft polyurethane elastomer is prepared by reacting an organic polyisocyanate in the presence of a specified organometallic catalyst, with a molar ratio specified mixture of (a) low molecular weight triol and high molecular weight polyol, or (b) low molecular weight triol, aromatic ring containing low molecular weight diol and high molecular weight polyol.

Abstract: Rapidly cured polyurethane elastomers are prepared by mixing a diphenylmethanediisocyanate based liquid prepolymer obtained from polytetramethylene ether glycol and an aliphatic diol at specified proportions, and a curing agent essentially containing said polytetramethylene ether glycol, diol and organometallic catalyst.

Abstract: A thermosetting polyurethane resin which when used as a one-pack surface-protective coating agent for glass bottles, inorganic vessels, and the like exhibits excellent mechanical strength, appearance, and water resistance at sterilization temperatures of about 90.degree. C. is obtained by interacting: (a) 10 to 40% by weight of at least two polyoxyalkylene polyols based on the weight of the nonvolatile matter of the thermosetting polyurethane resin, said at least two polyoxyalkylene polyols including 1 to 8% by weight relative to the nonvolatile matter of the thermosetting polyurethane resin of a nonionic surface active agent selected from the group consisting of a polyoxyethylene glycol or a polyoxyethylene-polyoxypropylene glycol, and mixtures thereof, (b) a monofunctional isocyanate-blocking agent, (c) a chain-elongating agent, (d) a cross-linking agent, and (e) a mixture of methylene-bis (4-cyclohexylisocyanate) and iso-phorone diisocyanate at a molar ratio in the range of from 1:0.3 to 1:1.5.

Abstract: An aqueous dispersed urethane composition which is excellent in film-forming property and useful in protecting glass bottles when formed into a film can be obtained by producing a urethane oligomer by interacting a polyoxyalkylene glycol having a molecular weight equal to or above 1200, a low molecular weight chain-elongating agent selected from a glycol, an amino-alcohol and a diamine each having a molecular weight below 500, an isocyanate-blocking agent selected from an oxime, a lactam and an alcohol, and a diisocyanate, and dispersing the urethane oligomer and a hardener in water by the use of a surface active agent such that the sum by weight of the surface active agent contained in the aqueous dispersed urethane composition and the polyoxyalkylene glycol which is one of the starting materials for the production of the urethane oligomer is in the range of 15 to 35% of the sum by weight of the surface active agent, the urethane oligomer and the hardener.

Abstract: A thixotropic urethane-base sealing material comprising a base polymer selected from the group consisting of a urethane prepolymer and a mixture thereof with a polyol, prior to being hardened, colloidal silica or bentonite used as an anti-sag agent, and an additive used in synergistic combination with the anti-sag agent selected from the group consisting of a sulfoxide expressed by the formulaR.sup.1 SOR.sup.2wherein R.sup.1 and R.sup.2 each represent lower alkyl, and an amide expressed by the formulasR.sup.3 CONR.sup.4 R.sup.5and ##STR1## wherein R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent hydrogen or lower alkyl, whereby the thixotropic properties of the base polymer are remarkably improved, and a process for producing said material.

Abstract: A process for manufacturing high-resilient flexible urethan foams characterized by, reacting and foaming polyalkylene ether polyol and an organic polyisocyanate in the presence of a blowing agent, a surfactant and catalyst, (1) using as said polyalkylene ether polyol one which contains 2 to 10% by weight of a vinyl type polymer and in which its hydroxyl number ranges from 25 to 60 mg KOH/g, of its hydroxyl groups 20 to 70 mol% are primary hydroxyl groups and the remaining hydroxyl groups are secondary hydroxyl groups; (2) using as said organic polyisocyanate a mixture of tolylene diisocyanate with diphenylmethane diisocyanate or a crude diphenylmethane diisocyanate; and (3) using as said surfactant a mixture of a high-molecular-weight siloxane-oxyalkylene copolymer with a low-molecular-weight siloxane-oxyalkylene copolymer.