Low energy-curable high solids coatings

Claim 1

A high solids liquid composition comprising (I) from 20 to 60 weight percent of a polycaprolactone adduct, (II) from 5 to 50 weight percent of monocarboxylic acid compound, (III) from 30 to 90 weight percent of a polyepoxide and (IV) from 0.1 to 10 weight percent of a stannous salt catalyst; said percentages based on the combined weight of (I), (II), (III), and (IV); wherein said component (I) comprises a carboxyl-modified polycaprolactone adduct reaction product mixture produced by the reaction of (i) a polycaprolactone polyol and (ii) from 0.5 to 1 carboxylic acid anhydride equivalent for each hydroxyl equivalent present in said polycaprolactone polyol of an intramolecular anhydride of a polycarboxylic acid; said component (II) is a compound of the general formula: HOOC--R--(COOR'").sub.x wherein x is an integer having a value of from 0 to 2; when x is 0, R can be (i) a phenyl group, or (ii) an alkyl group having from 6 to 24 carbon atoms; when x is 1, R can be a --CH═CH-- group; when x is 1 or 2, R can be (iii) a polyvalent alkylene group having from 1 to 12 carbon atoms, or (iv) a polyvalent phenylene group, or (v) a polyvalent naphthylene group; R'" is (i) an alkyl group having from 1 to 8 carbon atoms, or, (ii) a --C n H 2n (OC n H 2n ) m OC p H 2p+1 group, or (iii) a --C n H 2n OOCCX═CH 2 group; n is an integer having a value of 2 to 4; m is an integer having a value of 0 to 10; p is an integer having a value of 1 to 15; and X is hydrogen or methyl; and wherein component (IV) is a stannous acylate of a mono- or dicarboxylic acid having from 1 to 54 carbon atoms or a stannous alkoxide having from 1 to 18 carbon atoms in the alkoxide group.