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US 6,645,552 B1Granted
Method of improving the drying time of a thick coating
AssigneeRohm and Haas Company
InventorsDonald Craig Schall, Jeffrey Joseph Sobczak
Life of this patent
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Abstract
A method is disclosed of improving the drying time of a thick, exterior, waterborne coating containing a quick-setting binder by applying the coating as at least two separate layers and as “wet-on-wet” layers.
Claims3
A method of preparing an exterior coating, said method comprising the steps of:
- (a) preparing a waterborne coating formulation containing a quick-setting binder,
- (i) an anionically stabilized polymer having Tg of greater than −10° C.;
- (ii) a polyamine functional polymer formed from amine monomer or imine monomer;
- and
- (iii) a volatile base in an amount sufficient to deprotonate the conjugate acid of said polyamine functional polymer;
- (b) applying a first portion of said coating formulation to a substrate to form a first wet coating;
- wherein said first portion is 25% to 75% by weight, based on the weight of said total coating formulation;
- (c) applying at least one second portion of said coating formulation to said first wet coating before said first wet coating has dried to form at least one second wet coating;
- wherein said at least one second portion is a single application and is 25% to 75% by weight, based on the weight of said total coating formulation;
- and
- (d) permitting said first wet coating and said at least one second coating to dry;
- wherein the total thickness of said first wet coating and said at least one second wet coating is 0.4 mm to 5.0 mm.
9 more elements
Dependencies are inferred from the claim text.