Fast drying clear coat composition with low volatile organic content
AssigneePPG Industries Ohio, Inc.
InventorsStephen J. Thomas, Charles M. Kania
Life of this patent
Estimating the term…
Abstract
A fast-drying coating composition intended primarily as an automotive clear coat that may be cured at ambient conditions is provided with VOC less than 4.0 (preferably about 3.5) by the use as a major film-forming component an acrylic polyol that is the product of a combination of alkyl (meth)acrylate monomers and hydroxyalkyl (meth)acrylate monomers, at least one of which in a specific embodiment is the reaction product of a hydroxyalkyl (meth)acrylate and .epsilon.-caprolactone. The coating composition further includes a curing agent reactive with hydroxyl groups, particularly a polyisocyanate.
Claims20
A non-aqueous coating composition comprising:
- (A) 50 to 80 weight percent, based on total resin solids of (A) and (B), of an acrylic polyol comprising the polymerization product of:
- (i) 20 to 70 percent hydroxy functional acrylate monomers comprising:
- (a) 0.5 to 15 percent of acrylate or methacrylate in which the esterifying group is the residue of a glycidyl group and includes a branched alkyl group;
- (b) 5 to 40 percent of acrylate or methacrylate in which the esterifyinig group is a hydroxy ester having one or more ester groups;
- and
- (c) 0 to 40 percent of one or more hydroxyalkyl acrylate or hydroxyalkyl methacrylate monomers different from (a) or (b);
- (ii) 30 to 80 percent acrylate monomers without functional groups reactive with isocyanate;
- and
- (iii) 0 to 5 percent unsaturated acid monomer;
- wherein the percentages of each of the acrylic polyol constituents is based upon total resin solids weight of all the acrylic polyol constituents;
- (B) 20 to 50 weight percent, based on total resin solids of (A) and (B), of a curing agent reactive with hydroxyl groups;
- the percentages based on weight of total resin solids of the composition;
- and
- (C) diluent consisting essentially of organic liquid;
- wherein the volatile organic content of the coating composition is less than 4.0 pounds per gallon in a non-aqueous composition.
Dependencies are inferred from the claim text.