Coating compositions based on polyol-containing film forming components and organic alcoholic reactive diluents

A coating composition capable of liquid application to a substrate, the vehicle portion of the composition consisting essentially of:

• (a) from about 60 percent to about 97 percent of (1) a polyester polyol having an hydroxyl equivalent weight of from about 40 to about 500 and an hydroxy functionality of at least 2.0, and (2) an aminoplast crosslinking agent, said aminoplast being based on the reaction product of formaldehyde with an amino- or amide- group carrying substance, wherein the ratio of the polyester polyol to the aminoplast resin ranges from about 80:20 to about 20:80;
• and
• (b) from about 3 percent to about 40 percent of an organic ester reactive diluent capable of chemically combining with the curable film-forming component, said reactive diluent having one primary or secondary hydroxyl group and further characterized by having a retained solids value of greater than about 80 percent, a hydroxyl equivalent weight of from about 180 to about 800 and a liquid viscosity of less than about 10 poises at 60.degree. C.

A coating composition capable of liquid application to a substrate, the vehicle portion of the composition consisting essentially of:

• (a) from about 60 percent to about 97 percent of (1) a polyester polyol having an hydroxyl equivalent weight of from about 40 to about 500 and an hydroxy functionality of at least 2.0, and (2) etherified melamine formaldehyde crosslinking agent, wherein the ratio of the polyester polyol to the crosslinking agent ranges from about 80:20 to about 20:80;
• and
• (b) from about 3 percent to about 40 percent of an organic reactive diluent capable of chemically combining with the curable film-forming component, said diluent based on the reaction product of trimethylolpropane diallyl ether, phthalic anhydride and propylene oxide further characterized in having one primary or secondary hydroxyl group, retained solids value of greater than about 80 percent, a hydroxyl equivalent weight of from about 180 to about 800, and a liquid viscosity of less than about 10 poises at 60.degree. C.

A coating composition capable of liquid application to a substrate, the vehicle portion of the composition consisting essentially of:

• (a) from about 60 percent to about 97 percent of a curable film forming component, wherein said component is (1) an organic polyol having a hydroxyl equivalent weight of from about 40 to about 500 and a hydroxyl functionality of at least 2.0 and (2) a crosslinking agent, and the ratio of the polyol to the crosslinking agent ranges from about 80:20 to about 20:80;
• and
• (b) from about 3 percent to about 40 percent of an organic reactive diluent capable of chemically combining with the curable film forming component, said reactive diluent having one primary or secondary hydroxyl group and selected from the group consisting of amides, esters, urethanes, ureas, sulfur-containing compounds and mixtures thereof, and further characterized by having a retained solids value of greater than about 80 percent, a hydroxyl equivalent weight of from about 180 to about 800 and a liquid viscosity of less than about 10 poises at 60.degree. C.