GB869969A - Improvements in or relating to a process for curing a glycidyl polyether - Google Patents

Abstract

A curable composition comprises (1) a glycidyl polyether with an epoxy equivalency greater than 1,0 and (2) a trihydrocarbyl phosphite having the general formula P(OR)3 wherein R is a hydrocarbyl radical or substituted hydrocarbyl radical. The mixture forms a stable one-package curing system, which cures when contacted with an atmosphere having a relative humidity of at least 25%. Glycidyl ethers which can be used are those described in Specification 730,670; glycidyl ethers of novolac resins, such as formaldehyde 2, 2-bis(5-hydroxyphenol) propane novolac; and glycidyl polyethers of a , a , o , o -tetrakis (hydroxyaryl) alkanes. Diluents which may be added to the compositions are ketones, esters, ether-alcohols, chlorinated hydrocarbons, aromatic hydrocarbons, alcohols, diethyl phthalate, liquid monoepoxy compounds such as glycidyl allyl ether, phenyl glycidyl ether and styrene oxide and cyano-substituted hydrocarbons such as acetaonitrile. Stabilizer, dyes and pigments may also be added. The products are useful in coating and laminating applications. Curing may be effected at temperature of 15 DEG -100 DEG C. In examples the glycidyl polyethers employed are reaction products of bisphenol and epichlorhydrin having epoxy equivalencies and molecular weights of 1,75, 350 and 1,90, 483, respectively. These are mixed with (1) and (2) triphenyl phosphite; (3) trimethyl phosphite; (4) trichloroethyl phosphite and (5) trichlorohexyl phosphite. The latter can be replaced by tributyl, triamyl, trihexyl or triallyl phosphite. Films of the mixtures are cured by exposure to moist air. Phosphites in which R represents cycloalkyl, cycloalkenyl, alkaryl, and arylalkyl radicals are also referred to.