Polyurethane casting resins
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsRainer Hoefer, Bert Gruber, Alfred Meffert, Roland Gruetzmacher
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Abstract
Reactive resin systems suitable for cast-molding polyurethanes comprise reactive isocyanates and chain extenders for the isocyanates comprising polyol addition products of C.sub.1 -C.sub.8 alcohols and epoxidized triglyceride oils: if desired, the polyol addition products used have been alkoxylated with C.sub.2 -C.sub.4 -alkylene oxides.
Claims48
A hardenable urethane reactive resin system for preparing cast-molded rigid polyurethanes for insulation coating of electrical components consisting essentially of a reactive polyisocyanate and a hardener for the isocyanate which is the polyol addition product of an epoxidized triglyceride and a monohydric C.sub.1 -C.sub.8 -alcohol wherein the addition is carried out in the presence of an acidic catalyst which is neutralized after completion of the addition with diethyl ethanolamine or dimethyl ethanolamine and the neutralized acidic catalyst remains in the reactive resin system as a component thereof.
A process for the production of a polyurethane comprising forming a reactive resin system by combining a reactive polyisocyanate with a hardener for the isocyanate which is the polyol addition product of an epoxidized triglyceride and a monohydric C.sub.1 -C.sub.8 -alcohol, and reacting the reactive components of the system to form a polyurethane, and wherein the addition is carried out in the presence of an acidic catalyst which is neutralized after completion of the addition with diethyl ethanolamine or dimethyl ethanolamine and the neutralized acidic catalyst remains in the reactive resin system as a component thereof.
Dependencies are inferred from the claim text.