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US 5,331,078 AGranted
Blocked highly functional polyisocyanate adducts, a process for the preparation thereof and the use thereof
AssigneeHuls Aktiengesellschaft
InventorsRainer Gras, Elmar Wolf
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Abstract
A blocked highly functional polyisocyanate adduct is described with a melting point of <128.degree. C., preferably 80.degree.-110.degree. C., which is characterized in that the blocked polyisocyanate adduct with a functionality >2 contains 1.1-2 mol of blocking agent per blocked NCO group.
Claims18
A blocked highly functionalized polyisocyanate composition comprising:
- (a) a polyisocyanate with an isocyanate functionality greater than 2;
- and
- (b) a blocking agent;
- wherein 1.25-2 mole of said blocking agent are reacted per NCO group, and wherein the melting point of said composition is less than 128.degree. C.
1 more element
A process for the preparation of a blocked polyisocyanate comprising:
- i) reacting polyisocyanates A), B) and C) of the formulas below ##STR3## and m is 1-4;
- n is 3 or 4 and R' is the hydrocarbon radical of a polyhydric alcohol;
- with a monofunctional blocking agent, wherein 1.25-2 mol of said blocking agent are reacted per NCO equivalent.
Dependencies are inferred from the claim text.