Thermosetting, electrostatically sprayable compositions containing blocked acid catalyst

Claim 1

A thermosetting liquid electrostatically sprayable composition consisting essentially of: (A) film forming constituents consisting essentially of: (1) 50-80 parts, by weight of the film formers, of an ester blend consisting essentially of: (a) 40-80 parts by weight, based on the weight of the blend, of a polyester of the following structure: ##STR4## its isomer through the secondary hydroxyl group of mixtures thereof, wherein n=0-10 and at least 65% by weight is n=3 or less; and (b) 60-20 parts by weight, based on the weight of the blend, of a polyester of the following structure: ##STR5## its isomer through the secondary hydroxyl group or mixtures thereof, wherein n=0-10 and at least 65% by weight is n=3 or less and wherein m=2-4; and (2) 50-20 parts, by weight of the film formers, of peralkoxymethylmelamine; and (B) sufficient blocked acid catalyst to contain 0.05-2 parts, by weight of the film formers, of potentially available sulfonic acid, wherein the blocked catalyst is the reaction product of a material containing at least one oxirane functionality and a sulfonic acid is an equivalent ratio of at least one; and wherein the composition has a resistivity of at least 1 megohm and up to 3.5 megohms.