UV curable coating composition and method of making
AssigneePPG Industries Ohio, Inc.
InventorsCharles M. Kania, Debra L. Singer, Diane J. Schillinger
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Abstract
The present invention relates to solid, particulate free film-forming compositions, multi-layer composite coatings comprising such film-forming compositions and methods of applying such multi-component composite coatings to a substrate. The solvent free film-forming compositions include UV-curable powder coating compositions comprising an amorphous (meth)acrylate terminated poly(ester-urethane) and optionally a second (meth)acrylate terminated polyurethane.
Claims13
A UV-curable powder coating composition comprising an amorphous (meth)acrylate terminated poly(ester-urethane) comprising the reaction product of:
- (A) an amorphous polyester polyol having an OH number of greater than 160 mg KOH/g, the amorphous polyester polyol being prepared by polycondensation of (i) a polycarboxylic acid or acid anhydride thereof;
- and (ii) a polyol, the polyol comprising a mixture of a polyol having hydroxyl functionality of three or greater and a diol, wherein the weight ratio of the polyol having hydroxyl functionality of three or greater to diol is from 0.5 to 1.0:1, and
- (B) an adduct of polyisocyanate and a hydroxyl functional (meth)acrylate, the adduct being monofunctional with respect to isocyanate;
- in which the difference in the melt viscosity of the amorphous (meth)acrylate terminated poly(ester-urethane) measured at temperatures of 125° C. and 150° C. is no greater than 20,000 cps.
A multi-component composite coating composition comprising a base coat deposited from a pigmented film-forming composition and a transparent topcoat applied over the base coat in which the transparent topcoat is deposited from a UV curable powder coating composition comprising:
- (A) an amorphous (meth)acrylate terminated poly(ester-urethane) comprising the reaction product of an amorphous polyester polyol having an OH number of greater than 160 mg KOH/g, the amorphous polyester polyol being prepared by polycondensation of (i) a polycarboxylic acid or acid anhydride thereof;
- and (ii) a polyol, the polyol comprising a mixture of a polyol having hydroxyl functionality of three or greater and a diol, wherein the weight ratio of the polyol having hydroxyl functionality of three or greater to diol is from 0.5 to 1.0:1, and
- (B) an adduct of polyisocyanate and a hydroxyl functional (meth)acrylate, the adduct being monofunctional with respect to isocyanate;
- in which the difference in the melt viscosity of the amorphous (meth)acrylate terminated poly(ester-urethane) measured at temperatures of 125° C. and 150° C. is no greater than 20,000 cps.
Dependencies are inferred from the claim text.