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US 2011/0256320 A1Published application
Method for using 3-coat-1-bake waterborne coating composition
AssigneeE.I. du Pont de Nemours and Company
InventorsTaddesse Gebregiorgis, Donald Albert Paquet, JR.
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Abstract
Disclosed herein is a method to apply waterborne primer, basecoat and clearcoat compositions in a wet-on-wet manner followed by the curing of all three applied compositions to form a durable protective coating on a substrate. The primer composition comprises (meth)acrylic latex, polyurethane resin, melamine and, optionally, polyesters.
Claims10
A method of forming a multi-layer coating on a substrate, said method comprising the steps of;
- (1) applying to the substrate a layer of a waterborne primer composition;
- (2) applying a layer of a waterborne basecoating composition;
- (3) applying a layer of a waterborne clearcoat composition;
- and
- (4) curing the applied three layers by baking;
- wherein said waterborne primer composition comprises;
- (a) a waterborne or water dispersible film forming binder;
- and
- (b) pigments;
- wherein said (a) waterborne or water dispersible film forming binder comprises;
- (A) 20 percent to 60 percent by weight (meth)acrylic latex;
- (B) 5 percent to 40 percent by weight of a polyurethane resin;
- (C) 5 percent to 30 percent by weight melamine;
- and
- (D) optionally, up to 25 percent by weight of polyester;
- and wherein the pigment to film forming binder ratio of said waterborne primer composition is in the range of from 80/100 to 150/100;
- and wherein all percentages by weight are based on the total weight of (A), (B), (C) and (D) being equal to 100 percent.
14 more elements
Dependencies are inferred from the claim text.