Anticorrosive coating composition

Claim 1

A coating composition which comprises a mixture of (A) a polyol resin obtained by the reaction of an amino compound having at least one primary or secondary amino group with a prepolymer containing epoxy groups which prepolymer has been prepared by reacting an epoxy resin, with a polyhydroxy phenolic compound selected from the group consisting of polynuclear polyhydroxy phenols having adjacent hydroxy groups, polyol esters of polyhydroxy phenolic carboxylic acids having adjacent hydroxy groups, and mixtures thereof, said prepolymer containing at least 0.05 mole of said polyhydroxy phenolic compound, per molecule, and having an average epoxide equivalent of less than 3000; (B) a compound having more than one isocyanate group or groups which change to isocyanate groups under conditions effective for hardening the coating composition; and (C) a material selected from the group consisting of coal tar, coal tar pitch, cut-back tar, bojuntan and asphalt, wherein the reaction ratio of said amino compound to said prepolymer, by equivalents of groups of said amino compound that are reactive with the epoxy groups of said prepolymer, is from 1.1 to 0.7; the ratio of (A) to (B), by equivalents of the hydroxy groups of (A) to the isocyanate groups of (B), is from 0.4 to 1.2; and the weight ratio of (C) to (A) is from 0.5 to 2.