GB868892A - Improvements in or relating to hardenable epoxide resinous compositions - Google Patents

Abstract

A hardenable resinous composition comprises a glycidyl ether containing more than one 1, 2-epoxy group per average molecule and as hardening agent the product obtained by reacting a phenol, an aldehyde and a polyamine containing at least four hydrogen atoms bonded to nitrogen atoms, either by the addition of the aldehyde to the phenol/polyamine mixture or by the addition of the phenol to an aldehyde/polyamine mixture, in such proportions that the reaction product contains at least "three active hydrogen atoms" (which denotes hydrogen atoms which will react with the epoxy groups in the glycidyl ether). Preferred glycidyl ethers are those obtained by reacting polyphenols such as diphenylol propane with epichlorhydrin or chemically related compounds such as dichlorhydrin or 1, 2-dichloro-3-hydroxy-propane. In the preparation of the hardening agents there may be used phenol, xylenol or diphenylol propane or a mixture of phenols; formaldehyde, acetaldehyde, paraldehyde and furfuraldehyde; diethylene triamine, triethylene tetramine, tetraethylene pentamine and 1, 6-hexamethylene diamine. Preferably the phenol and aldehyde are used in equimolecular amounts. In examples hardening agents are prepared by (a) slowly adding two molecular equivalents of formalin to a mixture of two equivalents of phenol and one equivalent of tetraethylene pentamine at 45 DEG C.; (b) similarly reacting equimolecular proportions of xylenol, 1, 6-hexamethylene diamine and formaldehyde. The hardening agents can be modified by reaction with ethylene oxide or acrylonitrile. In examples a liquid epoxide resin of epoxide equivalent 190, prepared from diphenylol propane and epichlorhydrin, is hardened with (1) hardening agent A; (2) cyanoethylated hardening agent A; (3) a mixture of hardening agent A and tetraethylene pentamine. The compositions can be used as coating compositions and in glass fibre laminates, brush setting cements, adhesives, foundry patterns, flexible sealing compounds and cable jointing. Specification 789,475 is referred to.