Alkylated isoadipoguanamine-formaldehyde crosslinking resin and improved coating compositions produced therefrom

Claim 1

A substrate coated with a first cured improved coating composition and subsequently overlaid with a second cured improved coating composition, wherein: (A) said first composition contains pigment and said second composition is unpigmented; and (B) both said first improved composition and said second improved composition are of the kind having (1) binder constituents consisting essentially of a film-forming material and a crosslinker for the film-forming material, wherein the film-forming material is selected from the group consisting of acrylic resins, polyester or alkyd resins, and epoxy resins, or mixtures of these, and (2) a solvent for the binder constituents, wherein the improvement is characterized in that the crosslinker for the film-forming material is an alkylated isoadipoguanamine-formaldehyde resin consisting essentially of the reaction product of: (1) an isoadipoguanamine mixture consisting essentially of: (a) about 87-95 percent by weight, based on the weight of the isoadipoguanamine mixture, of 2-methylglutaroguanamine, (b) about 4-12 percent by weight, based on the weight of the isoadipoguanamine mixture, of 2-ethylsuccinoguanamine, and (c) about 1-2 percent by weight, based on the weight of the isoadipoguanamine mixture, of adipoguanamine; (2) from 3-6 moles of formaldehyde per mole of said isoadipoguanamine mixture; and (3) a stoichiometric excess of an aliphatic alcohol having 1-4 carbon atoms or of a mixture of such alcohols.