Process for the production of polyisocyanates of isocyanurate structure
AssigneeBayer Aktiengesellschaft
InventorsPramod Gupta, Roland Nast, Erwin Windemuth
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Abstract
Soluble polyisocyanates of isocyanurate structure are produced by heating polyisocyanates in the presence of Mannich bases and carbamic acid esters of isocyanates and secondary alcohols. When such a process is used, the polymerization reactions begin without incubation times and the catalysts need not be inactivated by introducing additives because they deactivate themselves at high temperatures.
Claims11
A process for the production of organic polyisocyanates of isocyanurate structure comprising polymerizing organic polyisocyanates in the presence of catalysts which accelerate the trimerization of isocyanate groups to form isocyanurates, said catalyst comprising a mixture of Mannich bases and carbamic acid esters of isocyanates and alcohols with secondary hydroxyl groups.
Dependencies are inferred from the claim text.