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AssigneeBayer Aktiengesellschaft
InventorsManfred Bock, Josef Pedain, Wilhelm Slawyk
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The present invention relates to a new process for the preparation of polyisocyanates containing isocyanurate groups by the partial trimerization of the isocyanate groups of 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane (also known as isophorone diisocyanate and abbreviated IPDI), using catalysts which accelerate the trimerization of isocyanate groups, characterized in that the catalysts used are quaternary hydroxyalkyl ammonium hydroxides containing at least one hydroxyalkyl group. The present invention also relates to the polyisocyanates containing isocyanurate groups produced according to this process and to their use, optionally in the form of products which are blocked with blocking agents for isocyanate groups, as isocyanate components for polyurethane lacquers.
A process for the preparation of polyisocyanates containing isocyanurate groups which are soluble in lacquer solvents comprising
A polyisocyanate mixture produced by a process comprising
A process for the preparation of polyisocyanates containing isocyanurate groups which when dissolved at a concentration of about 75% by weight in ethylglycol acetate have a viscosity of at the most about 50,000 mPa.s at 25.degree. C., an isocyanate content of about 9.5 to 15.5% by weight and a free diisocyanate content of below about 3% by weight, which comprises partially trimerizing the isocyanate groups of 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane at temperatures between about 30.degree. and 90.degree. C. in the presence of quaternary hydroxy alkyl ammonium hydroxides containing at least one hydroxy alkyl group, thermally deactivating the catalyst and distilling off unreacted excess 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane.
Dependencies are inferred from the claim text.