Abstract: An elastic foamed grinder material of polyurea series for grinding and/or buffing, which is obtainable by subjecting a composition including a main ingredient component including a polyisocyanate, and a composition comprising an aromatic diamine, a foaming agent, a foam-adjusting agent and a curing catalyst to foaming and curing in the presence of grinder granules, wherein the aromatic diamine is an aromatic diamine oligomer alone or in mixture with an aromatic diamine compound, and a method for producing the grinder material.

Abstract: An elastic foamed grinder material of polyurea series for grinding and/or buffing, which is obtainable by subjecting a composition including a main ingredient component including a polyisocyanate, and a composition comprising an aromatic diamine, a foaming agent, a foam-adjusting agent and a curing catalyst to foaming and curing in the presence of grinder granules, wherein the aromatic diamine is an aromatic diamine oligomer alone or in mixture with an aromatic diamine compound, and a method for producing the grinder material.

Abstract: A polyurethaneurea elastomer obtained by reacting a polyisocyanate component obtained by reacting 1,5-naphthalene diisocyanate with a polyol, with an amine component consisting essentially of an amine compound of the formula (1): ##STR1## wherein R is a bivalent polyalkylene polyether or polyalkylene polyester having an average molecular weight of at least 200, which may contain unsaturated bonds in the polyalkylene.

Abstract: A process for producing polyurea resin in which an amine compound containing aromatic polyamine and specific aminobenzoate derivative and polyisocyanate are reacted. The polyurea resin is decreased in temperature dependence and improved in hardness, strength, toughness, and heat resistance.

Abstract: A process for producing polyurea resin in which an amine compound containing aromatic polyamine and specific aminobenzoate derivative and polyisocyanate are reacted. The polyurea resin is decreased in temperature dependence and improved in hardness, strength, toughness, and heat resistance.

Abstract: By coating the surface of granular harmful aromatic diamine with an organic coating agent consisting of aromatic diamine having no variant-causing property, at least one member selected from glycols and a syntehtic resin having solubility parameter of 9.0 or higher, the aromatic diamine which is regarded as harmful can be handled safely without damaging its essential property as a hardening agent.

Abstract: A polyurethane elastomer and a metal are strongly adhered by using (1) a composition containing a polyepoxy compound and a polyamine compound and (2) a composition containing an isocyanate compound having a concentration of isocyanate group of 15-50% by weight. An adhered composite article thus obtained has excellent water resistance and heat resistance.

Abstract: A polyurethane elastomer is produced by mixing a hardener composition containing a polyamine, a long chain polyol having an average molecular weight of 300 to 4,000 and a catalyst with an isocyanate composition comprises a prepolymer having terminal isocyanate group and an average molecular weight of 500 to 5,000 and an organic diisocyanate monomer with or without a triisocyanate monomer and a ratio of isocyanate groups of said prepolymer to amino groups of said polyamine is in a range of 0.6:1 to 1.5:1 and a ratio of a total of isocyanate groups in said isocyanate composition to a sum of amino groups of said polyamine and hydroxyl group of said long chain polyol is in a range of 0.8:1 to 1.4:1.

Abstract: A urethane elastomer is produced by simultaneously reacting an organic polyisocyanate with(1) a chain polyol having a molecular weight of 400 to 5,000,(2) an aromatic diamine and(3) a polyol having at least one urethane bond and/or an amino alcohol having at least one urethane bond.

Abstract: Urethane elastomers are prepared by reacting a long-chain polyol having a molecular weight of 400 - 5000 in a one-shot operation with an organic diisocyanate and a halogenated aromatic diamine of the general formula: ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are the same or different and each represents a halogen atom and n is zero or 1. According to this process, urethane elastomers possessing excellent physical characteristics can be produced economically and advantageously in the operations.