Acrylic polyurethane coating composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsEric C. Houze, Joseph A. Vasta
Life of this patent
Estimating the term…
Abstract
A coating composition in which the binder contains the following: (1) an acrylic polymer having pendent hydroxyl containing ester groups and (2) a polyisocyanate which has the formula ##STR1## where R.sup.4 is a hydrocarbon group having 6 carbon atoms. The composition can be used as an unpigmented clear finish or can contain convention pigments and be used as a colored finish. The composition is useful for refinishing trucks and automobiles and as an original finish for trucks, automobiles, boats, outdoor equipment and the like since the resulting finish is glossy, durable and weatherable.
Claims19
A coating composition having a binder solids content of 5-75% by weight and 95-25% by weight of an organic liquid;
- wherein the binder consists essentially of about
- (1) 50-95% by weight, based on the weight of the binder, of an acrylic polymer having a backbone of polymerized monomers selected from the group consisting of alkyl methacrylate, alkyl acrylate each having 1-12 carbon atoms in the alkyl group, styrene or mixtures thereof and having polymerized ethylenically unsaturated ester monomers that form ester groups A and B pending from the carbon atoms of the polymer backbone and comprise about 10 to 75% of the total weight of the acrylic polymer and the ester groups consisting essentially of ester group (A) ##STR8## and ester group (B) selected from the group consisting of ##STR9## or mixtures thereof, wherein the molar ratio of ester group (A) to ester (B) is from about 1:1.5 to 1:2.5;
- and wherein
- R.sup.1 is a saturated hydrocarbon group having 2-4 carbon atoms,
- R.sup.2 is phenylene,
- R.sup.3 is a tertiary hydrocarbon group having 8 through 10 carbon atoms;
- and
- (2) 5-50% by weight, based on the weight of the binder, of a polyisocyanate consisting of a polyisocyanate of the formula ##STR10## where R.sup.4 is a hexylene group.
Dependencies are inferred from the claim text.