Fast drying clear coat composition
AssigneePPG Industries Ohio, Inc.
InventorsSandra R. Stengel, Charles M. Kania, James A. Claar, Stephen J. Thomas, Kenneth J. Stachel
Life of this patent
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Abstract
A fast-drying coating composition intended primarily as an automotive clear coat contains (A) 25 to 80 weight percent of an acrylic polyol which is the polymerization product of unsaturated monomers of which 0.5 to 15 percent by weight (based on resin solids weight of the monomers) is an acrylate having the structure: where R1=H or CH3, R3 is H or an alkyl group, R4 is an alkyl group, and R5 is an alkyl group containing at least four carbon atoms; and (B) 20 to 75 weight percent of a curing agent reactive with hydroxyl groups, particularly polyisocyanates.
Claims13
A non-aqueous coating composition comprising as the primary curable, film-forming components:
- (A) 25 to 80 weight percent of an acrylic polyol having a number average molecular weight ranging from 1422 to 1756, which is the polymerization product prepared in the presence of a di-t-amyl derivative polymerization initiator of a combination of monomers comprising:
- (a) 1 to 10 percent by weight of a compound of the structure
- where R1=H or CH3,
- R3 is H or an alkyl group,
- R4 is an alkyl group,
- R5 is an alkyl group containing at least four carbon atoms;
- (b) 20 to 40 percent by weight hydroxy-containing vinyl monomers different from the monomer of (a);
- and
- (c) from 50 to 80 percent by weight of ethylenically unsaturated copolymerizable materials not containing hydroxyl groups;
- the percentages by weight of (a), (b), and (c) being based on the total solid resin weight of the monomers of (a), (b), and (c);
- and
- (B) 20 to 75 weight percent of a curing agent reactive with hydroxyl groups;
- wherein the weight percentages of (A) and (B) are based on the total resin solids weight of (A) plus (B);
- and
- (C) organic diluent.
Dependencies are inferred from the claim text.