DIMERIC DIOL-MODIFIED POWDER COATING CROSS-LINKING AGENTS CONTAINING URETDIONE GROUPS

摘要

Polyisocyanate polyaddition products which are solid below 40.degree.C and liquid above 125.degree.C, contain uretdione and urethane groups and have a content of at least 1 wt.% of urethane groups obtained from the reaction of dimeric diols with isocyanate groups; a method of producing the these products by the reaction of polyisocyanates containing uretdione groups with dimeric diols; and the use of these polyaddition compounds as the starting component in the manufacture of polyurethane plastics, particularly as the cross-linking component in thermally cross-linkable two-component polyurethane powder coating compositions.