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US 8,138,262 B2Granted
Waterborne, radiation-curable coating compositions and related methods
AssigneePPG Industries Ohio, Inc.
InventorM. Lisa Perrine
Life of this patent
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Abstract
Disclosed are waterborne, radiation-curable coating compositions. These coating compositions include a water-dispersible polymer and a hydrophobic multi-functional ethylenically unsaturated compound. The compositions are characterized by being viscosity stable at elevated temperatures and alkaline conditions.
Claims19
A waterborne, radiation-curable coating composition comprising:
- (a) a water dispersible polymer comprising a carboxylic acid functional vinyl polymer having an acid number of 15 to 50;
- (b) a hydrophobic multi-functional ethylenically unsaturated compound;
- and
- (c) a neutralizing agent comprising a monofunctional tertiary amine having a pKa of no more than 9.5 and present in an amount of at least 50 percent by weight, based on the total amine in the composition;
- wherein the monofunctional tertiary amine neutralizes acid groups of the carboxylic acid functional vinyl polymer;
- wherein the coating composition has a pH of 7 to 9″;
- wherein the composition has an initial viscosity of 100 to 300 centipoise at 77° F. and a final viscosity of 100 to 450 cps at 77° F. and
- wherein the composition is cured by exposure to ultraviolet rays or electron beam radiation.
5 more elements
A waterborne, radiation curable coating composition comprising:
- (a) a water dispersible polymer comprising a carboxylic acid functional vinyl polymer having an acid value of 15 to 50,
- (b) a hydrophobic multi-functional ethylenically unsaturated compound comprising trimethylolpropane tri(meth)acrylate and/or di-trimethylol propane tetra(meth)acrylate, and
- (c) a neutralizing agent comprising predominantly n-ethylmorpholine wherein the n-ethylmorpholine is present in an amount of at least 50 percent by weight, based on the total amine in the composition and neutralizes acid groups of the carboxylic acid functional vinyl polymer, and
- wherein the composition has a pH of 7 to 9 and is viscosity stable for at least 28days at 120° F., wherein the composition has an initial viscosity of100 to 300 centipoise at 77° F. and a final viscosity of 100 to 450 centipoise at 77° F.;
- and
- wherein the composition is cured by exposure to ultraviolet rays or electron beam radiation.
3 more elements
Dependencies are inferred from the claim text.