Hydroxyl terminated polyfunction epoxy curing agents

Details Hydroxyl terminated polyfunction epoxy curing agents Hydroxyl terminated polyfunction epoxy curing agents

C - Chemistry, Metallurgy

08

G

402/261, 260/305

C08G 59/14 (2006.01) C08G 59/18 (2006.01) C08G 59/38 (2006.01)

Patent

CA 1227202

HYDROXYL TERMINATED POLYFUNCTIONAL EPOXY CURING AGENTS ABSTRACT OF THE DISCLOSURE A polyglycidyl derivative of an aromatic diamine, aminophenol, or polyphenol and a diglycidyl ether of a bisphenol are reacted with a bisphenol, in the presence of a catalyst at elevated temperature, to yield a reaction product wherein each glycidyl group is effectively endcapped with a moiety containing a free hydroxyl group. The ratio of equivalents of polyglycidyl compound to diglycidyl compound is 1 to 4 to 1 to 1, and of bisphenol to total glycidyl compounds is 1.8 to 1 to 2.4 to 1. Said product is useful for curing solid epoxy resins. The epoxy resins cured by said product have a dense crosslinked network resulting in concomitant superior coating properties especially chemical resistance while maintaining good flexibility.

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