Polyisocyanates blocked with a mixture of blocking agents

Details Polyisocyanates blocked with a mixture of blocking agents Polyisocyanates blocked with a mixture of blocking agents

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C07D 251/34 (2006.01)

Patent

CA 2148987

Blocked polyisocyanates containing aliphatically and/or cycloaliphatically bound isocyanate groups blocked by a mixture of blocking agents containing A) 30 to 70 equivalent % of 1,2,4-triazole, B) 30 to 70 equivalent % of 3,5-dimethylpyrazole, and C) 0 to 30 equivalent % of other blocking agents, a method of preparing these blocked polyisocyanates by blocking the isocyanate groups of a (cyclo)aliphatic polyisocyanate, wherein up to 20 NCO equivalent % of the isocyanate groups may optionally be reacted with compounds containing carboxylic acid hydrazide groups and isocyanate-reactive groups, and the use of the blocked polyisocyanates as crosslinking agents for organic polyhydroxyl compounds in one- component polyurethane stoving compositions.

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