Abstract: A modified organic polyisocyanate is prepared in such a manner that a trimerization catalyst, an organic phosphite estr, and a surfactant, and optionally a ferrocene compound are added to an organic isocyanate and/or a partially urethanized organic polyisocyanate to cause isocyanuration in an extent that not more than 20% by weight of entire isocyanate groups are isocyanurated; and a stopper is added, if necessary.

Abstract: A method for producing a polyurethane type composite obtained by injecting a formulated liquid comprises an organic polyisocyanate, a polyol and a curing catalyst into a mold in which a fibrous reinforcing material is previously set, followed by curing, by means of a reaction injection molding machine, characterized in that:(1) a polyol component having a hydroxyl value of 300 to 800 is used as the polyol, and(2) an organic acid salt of a tertiary amine is used as the curing catalyst.

Abstract: A method for preparing a polyisocyanurate composite obtained by injecting a formulated liquid comprises an organic polyisocyanate, a polyol and a trimerization catalyst into a mold in which a fibrous reinforcing material is previously set by use of a reaction injection molding machine, wherein:(1) a single or mixed polyether polyol having a hydroxyl value of 40 to 400 is used as the polyol; and(2) the formulation ratio of the organic polyisocyanate and the polyol in terms of the isocyanurated isocyanate concentration [NCO].sub.T defined by the following formula (1) is in the range of 3.0 to 5.5 mmol/g: ##EQU1## [NCO].sub.T : theoretical concentration of isocyanate group consumed in isocyanuration;[NCO].sub.O : isocyanate group concentration in organic polyisocyanate (mmol/g);OH-V: hydroxyl value of single or mixed polyol;W.sub.A : weight fraction of organic polyisocyanate.

Abstract: A polyurethane elastomer produced by reaction of a polyisocyanate with an amine-type polyol and another type polyol, the polyisocyanate being an isocyanurate-modified hexamethyelene diisocyanate; and the equivalent ratio of active hydrogen to isocyanate group to be reacted being in a range of from 0.8 to 1.6; and the ratio of the amine-type polyol to the another type polyol being in a range of from 10/90 to 100/0 by weight.

Abstract: A thermoplastic polyurethane resin is prepared by the reaction of(A) p-phenylene diisocyanate,(B) a hydroxyl terminated poly(hexamethylene carbonate) polyol having a molecular weight of 850 to 5000 and(C) a short chain polyol having 2 to 10 carbon atoms as the chain extending agent,the molar ratio of (B) : (C) being 1:2 to 1:0.05, and the molar ratio of isocyanate groups : total active hydrogen groups being 0.93:1 to 1.20:1.

Abstract: A thermosetting urethane elastomer is prepared from:(a) a prepolymer having isocyanate groups at terminal ends obtained by allowing p-phenylene diisocyanate to react with a compound having 2 or more active hydrogens, and(b) curing agents of 1,4-bis(2-hydroxyethoxy)benzene and trimethylolpropane or 1,4-bis(2-hydroxyethoxy)benzene and a polyol having isocyanurate ring.

Abstract: A process for producing a polyoxymethylene-polyurethane type alloy, which comprises allowing a polyisocyanate compound, a short chain polyol with a molecular weight of 62 to 350, a long chain polyol with a number-average molecular weight of 400 to 5,000, and optionally additives to react with each other in the presence of at least one or polyoxymethylene polymers.

Abstract: The invention relates to a process for isocyanurating hexamethylene-diisocyanate containing polyol adduct thereof using a novel catalyst and to a paint composition formed from of the product of the above mentioned process and polyol, and to the composition yielding a paint film showing an excellent light resistance and weather resistance, especially high yellowing resistance.

Abstract: The thermoplastic polyurethane resin having a molecular weight larger than about 5,000 is obtainable by the polyaddition of a long chain diol (A) having a molecular weight ranging from about 500 to 3,000, an organic diisocyanate (C) and a short chain triol (D) having a molecular weight lower than about 500 and specified structures and, as desired, a short chain diol (B) having a molecular weight ranging from about 50 to 500, in specified ratios.The thermoplastic polyurethane resin provides particularly enhanced heat resistance and solvent resistance with improved dispersibility of a pigment or the like and other resins and favorable compatibility with a solvent or the like.