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Polyisocyanates blocked with epsilon-caprolactam and either diisopropylamine or 1,2,4-triazole, their preparation and use
Polyisocyanates blocked with epsilon-caprolactam and either diisopropylamine or 1,2,4-triazole, their preparation and use
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机译：用ε-己内酰胺和二异丙胺或1,2,4-三唑封闭的多异氰酸酯，其制备和用途
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摘要
The present invention relates to a blocked polyisocyanate containing:;
A1)40 to 70 equivalent % of a predominantly linear NCOprepolymer having an NCO content of 5.0 to 10.0 wt. %,A2)30 to 60 equivalent % of an aliphatic lacquer polyisocyanate,B1)30 to 60 equivalent % of epsilon-caprolactam andB2)40 to 70 equivalent % of diisopropylamine or 1,2,4-triazole asblocking agents,
;wherein the equivalent percents of isocyanate components A1) and A2) add up to 100 %, and the equivalent percents of blocking agents B1) and B2) add up to 100 to 110%, based on the equivalents of component A). The present invention also relates to a process for preparing these blocked polyisocyanates to coating compositions containing these blocked polyisocyanates and to metal substrates coated with these coating compositions.
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