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Abstract

A metal (M) alkyl acid phosphate catalyst for the reaction of an epoxy compound with a carboxyl compound to provide a coating formulation that is stable at room temperature; that is humidity resistant, and non-yellowing, wherein the alkyl acid phosphate has the formula: (RO).sub.n --(P.dbd.O)--(OH).sub.m and wherein: a. each R is selected from the group consisting of: i) a C.sub.1 to C.sub.18 alkly, cycloalkyl, or aryl; ii) a linear or branched C.sub.6 to C.sub.18 alkyl substituted with --(O--CH.sub.2 --CH.sub.2 --).sub.o or --(O--CH--CH.sub.3 --CH.sub.2 --).sub.p, wherein o or p is from 1 to 20; iii) a .beta.-hydroxyethyl compound, R'--X--CH.sub.2 --CH--OH--CH.sub.2 --, wherein R' is a C.sub.6 to C.sub.18 alkyl or cycloalkyl or aryl, X is either --CH.sub.2 --, --O-- or --COO--; b. n+m=3 and n is between 2 to 1; and c. M is Zn or Sn (II) in a mole equivalent of 0.7 to 1.5 moles per mole of alkyl acid phosphate.

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First Claim