Alkaline resistant organic coatings for corrosion susceptible substrates III

Claim 2

A water dilutable primer concentrate that provides upon intimate admixture with water a primer composition which retards corrosion even in substantial absence of chromate corrosion inhibiting pigments and which comprises an intimate admixture of film forming ingredients which consist essentially of: (A) A substantially gel free epoxy and amine reaction product which contains no ester linkages and which is made by reacting in non-aqueous water miscible medium reactants consisting essentially of:

Claim 3

An epoxy reactant having two 1,2-epoxy groups per molecule which is the reaction product of bisphenol A and epichlorohydrin and has an epoxide equivalent weight range from at least about 875 to 4,000; and 2. A water soluble amine reactant selected from the group consisting of secondary monoamines having a total of up to about 20 carbons, and comprising at least about 90 mole percent secondary hydroxy amine that has two or more alkyl groups each bearing a primary hydroxy group in a stoichiometric amount such that the reaction product (A) comprises tertiary amino and primary and secondary hydroxy groups and is substantially free of unreacted epoxy groups; (B) An amino aldehyde resin crosslinking agent at about 5-30% by weight of A; and (C) Non-chromate pigment at a weight ratio of A+B+C of about 40:60 to 60:40, wherein a mixture of A, B, and C is neutralized at least partially with D a weak organic acid.

Claim 4

An epoxy reactant having two 1,2-epoxy groups per molecule which is the reaction product of bisphenol A and epichlorohydrin and has an epoxide equivalent weight range from at least about 875 to 4,000; and 2. A water soluble amine reactant selected from the group consisting of secondary monoamines having a total of up to about 20 carbons, and comprising at least about 90 mole percent secondary hydroxy amine that has two or more alkyl groups each bearing a primary hydroxy group in a stoichiometric amount such that the reaction product (A) comprises tertiary amino and primary and secondary hydroxy groups and is substantially free of unreacted epoxy groups; (B) An amino aldehyde resin crosslinking agent at about 5-30% by weight of A; and (C) Non-chromate pigment at a weight ratio of A+B+C of about 40:60 to 60:40, wherein a mixture of A, B, and C is neutralized at least partially with D a weak organic acid.

Claim 5

The primer concentrate in accordance with claim 1, wherein the amine reactant is a dialkanol amine having up to about 10 carbons.

Claim 6

The primer concentrate in accordance with claim 1 or 2, wherein the amino aldehyde crosslinking agent comprises alkylated melamine resin.

Claim 7

The primer concentrate in accordance with claim 3, wherein the water miscible medium comprises a compound selected from R(OC x ) y -OH wherein R is C 1 -C 8 alkyl, X is 2-4, and y is 1-10 which boils below about 180° C.

Claim 8

The primer concentrate in accordance with claim 4, wherein the acid is selected from any of formic, acetic or oxalic acids.