URETHANE ACRYLATES FOR CURABLE COATINGS

摘要

The invention relates to a urethane (meth)acrylate not comprising caprolactone, which is the product of reaction of A) a monoalcohol bearing from 1 to 5 (meth)acrylates, B) an allophanate-modified polyisocyanate, C) optionally, in the presence of a saturated polyol of functionality 2 to 3, D) optionally, in the presence of an unsaturated polyol with a hydroxyl functionality of 2 to 4, said polyol being C3 to C18, E) optionally, in the presence of a reactive diluent.;The invention also relates to a process for preparing said urethane (meth)acrylate, and also to its use in curable compositions for coatings, in particular for varnishes and inks, adhesives, adhesion primers, coatings for wood, metal or plastic and application by spray gun in particular. These coatings have a good compromise between reactivity, flexibility, adherence and hardness, while at the same time being easy to apply.

主权项

1. A urethane (meth)acrylate, comprising the product of reaction of:
A) at least one monoalcohol bearing n (meth)acrylate groups with n ranging from 1 to 5, B) at least one allophanate-modified polyisocyanate, said polyisocyanate bearing at least one allophanate group in its structure and resulting from the reaction of an aromatic or aliphatic or cycloaliphatic initial polyisocyanate in excess with a monoalcohol, under conditions allowing the formation of allophanate by reaction of at least a second molecule of said initial polyisocyanate, with at least one formed urethane group, C) optionally, in the presence of at least one saturated polyol of functionality ranging from 2 to 3, D) optionally, in the presence of an unsaturated polyol of functionality ranging from 2 to 4 of hydroxyl, optionally bearing at least one or two (meth)acrylate groups, said polyol being C3 to C18, E) optionally, in the presence of a reactive diluent, which is a diluent which is radically polymerizable with said urethane (meth)acrylate, wherein the urethane (meth)acrylate does not comprise caprolactone in its structure.