Blocked polyisocyanates

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...

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2521822, 25218221, 25218222, 5482622, 525124, 525127, C08G 1880

Patent

active

055233775

ABSTRACT:
Blocked (cyclo)aliphatic polyisocyanates wherein 30 to 70 equivalent-% of the isocyanate groups are blocked with butanone oxime, 30 to 70 equivalent-% of the isocyanate groups are blocked with 1,2,4-triazole and 0 to 30 equivalent-% of the isocyanate groups are blocked with other blocking agents; a method for their preparation by blocking lacquer polyisocyanates with these blocking agents, optionally with the prior, simultaneous or subsequent modification of the polyisocyanates with hydrazine derivatives containing one or more isocyanate-reactive groups; and the use of the blocked polyisocyanates as cross-linking agents for organic polyhydroxy compounds in one-component polyurethane stoving compositions.

REFERENCES:
patent: 4369301 (1983-01-01), Konig et al.
patent: 4482721 (1984-11-01), Wegner
patent: 5091475 (1992-02-01), Potter
patent: 5112931 (1992-05-01), Potter

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