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

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.