Energy curable adduct containing a silane group and coating therefrom
OwnerAdrian J. Birch, Alan W. Duffinventors
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Abstract
Disclosed is a polyfunctional liquid polyurethane-containing adduct wherein the adduct contains statistically as a first functional group at least one structo-terminal polymerizable group and at least one second structo-terminal functional group per molecule which is a silane moiety. Such compounds are useful in radiation curable coatings.
Claims14
A liquid polyurethane-containing adduct wherein the adduct contains as a first functional group at least one structo-terminal polymerizable group and at least one second structo-terminal functional group per molecule which is a silane moiety.
A method for making an adduct containing at least one structo-terminal polymerizable group and at least one structo-terminal silane group comprising the steps of
- (1) mixing a polyol containing isocyanate reactive groups with a polyisocyante at a stoichiometric excess of isocyanate groups to isocyanate groups to form an isocyanate terminated prepolymer;
- (2) mixing the prepolymer obtained from step 1 with an isocyanate-reactive compound containing a polymerizable moiety wherein the number of isocyanate-reactive moieties is less than a stoichiometric amount with respect to the isocyanate moieties present on the prepolymer;
- (3) mixing the product from step 2 with an isocyanate-reactive compound containing a silane moiety where the stoichiometric amount of isocyanate-reactive groups is at a slight excess with respect to the number of free isocyanate groups remaining after step 2;
- and
- (4) recovering the product from step 3.
Dependencies are inferred from the claim text.