UV curable coatings
AssigneeTarkett Inc.
InventorPeiwen Jin
Life of this patent
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Abstract
The present invention relates to oligomers or prepolymers which are formed by reacting an isocyanate, a lactone adduct and a hydroxyalkyl acrylate or methacrylate. These oligomers can be used to make UV curable coatings by adding acrylate monomers, photoinitiators and wetting agents. Transparent, abrasion resistant surfaces result from the cure by ultraviolet light of these coatings on substrates such as PVC based substrates. By adjusting the ratio of hydroxyalkyl acrylate or methacrylate and the lactone adduct component in the oligomer, coatings with both high tensile strength and elongation can be obtained.
Claims30
A UV curable composition having a low viscosity and useful in the preparation of coatings having high tensile strength, high elongation and high gloss retention, prepared by reacting a caprolactone adduct and an isocyanate in a first reaction, wherein the product of said first reaction is further reacted with a hydroxyalkyl acrylate or methacrylate and an additional caprolactone adduct component, while the ratio of said acrylate or methacrylate to caprolactone adduct is adjusted in order to vary the hardness and flexibility of the composition as desired.
A method of making a UV curable composition having a low viscosity and useful in the preparation of coatings having high tensile strength, high elongation and high gloss retention, which comprises:
- (a) reacting a caprolactone adduct with an isocyanate;
- and
- (b) reacting the product of step (a) with a hydroxyalkyl acrylate or methacrylate and an additional caprolactone adduct component, while adjusting the ratio of said acrylate or methacrylate to caprolactone adduct in order to vary the hardness and flexibility of the composition as desired.
Dependencies are inferred from the claim text.