Coating compositions containing aminoplast resins

Claim 1

A PROTECTIVE COATING COMPOSITION COMPRISING AN ORGANIC SOLVENT SOLUTION OF A TERNARY MIXTURE OF (1) AN OIL-MODIFIED ALKYD RESIN, (2) AN ETHERIFIED FORMALDEHYDE CONDENSATE OF AN N-SUBSTITUTED MELAMINE AND (3) AN ETHERIFIED FORMALDEHYDE CONDENSATE OF MELAMINE, SAID OIL-MODIFIED ALKYD RESIN CONSTITUTING 50-90 WEIGHT PERCENT OF THE TOTAL OF (1), (2) AND (3), SAID ETHERIFIED FORMALDEHYDE CONDENSATE OF AN N-SUBSTITUTED MELAMINE CONSTITUTING AT LEAST 5 WEIGHT PERCENT OF THE TOTAL OF (2) (3), SAID ETHERIFIED FORMALDEHYDE CONDENSATE OF AN NSUBSTITUTED MELAMINE BEING A RESIN THAT IS PREPARED BY HEATING A MIXTURE OF AT LEAST 3 MOLS OF A MONOHYDRIC ACYCLIC ALCOHOL CONTAINING 1-6 CARBON ATOMS AND A CONDENSATION PRODUCT OF 1 MOL OF AN N-SUBSTITUTED MELAMINE AND AT LEAST 1 MOL OF FORMALDEHYDE TO SUBSTANTIALLY ATMOSPHERIC REFLUX TEMPERATURE AT A PH OF 5.5-7.0 FOR A PERIOD OF TIME SUFFICIENT TO ETHERIFY AND POLYMERIZE SAID CONDENSATION PRODUCT OF THE N-SUBSTITUTED MELAMINE AND FORMALDEHYDE, SAID N SUBSTITUTED MELAMINE BEING SELECTED FROM THE GROUP CONSISTING OF N,N''-DIALKYLMELAMINES, N,N'',N"-TRIALKYLMELAMINES AND MIXTURES THEREOF, THE INDIVIDUAL ALKYL GROUPS OF SAID N-SUBSTITUTED MELAMINES BEING ACYCLIC AND CONTAINING A MAXIMUM OF ABOUT 20 CARBON ATOMS AND THE TOTAL NUMBER OF CARBON ATOMS CONTAINED IN ALL OF SAID ALKYL GROUPS NOT EXCEEDING ABOUT 36, SAID ETHERIFIED FORMALDEHYDE CONDENSATE OF MELAMINE BEING AN ETHERIFIED REACTION PRODUCT OF AT LEAST 4 MOLS OF A MONOHYDRIC ACYCLIC ALCOHOL CONTAINING 1-6 CARBON ATOMS AND A CONDENSATION PRODUCT OF 1 MOL OF MELAMINE AND AT LEAST 3 MOLS OF FORMALDEHYDE.