4,4'-Diaminodiphenylmethanes, Process for Their Manufacture and Their Use as Hardeners for Epoxy Resins.

摘要

The invention concerns a process for the manufacture of 4,4'-diaminodiphenylmethanes. They are liquid at room temperature, can be easily mixed with liquid polyepoxides, and the mixtures have a long pot life or processing life. The chlorinated and brominated compounds, can also give the cured products flame-repelling properties. The hardeners contain as an active constituent a 4,4'-diaminodiphenylmethane having the general formula or an eutectic mixture of a compound having the general formula and a diamine, which, with a compound having the general formula, can form an eutectic mixture that is liquid at room temperature such as 4,4'-diamino-3,3'-diethyldiphenylmethane, 4,4'-diaminodiphenylmethane, 4,4'-diamino-3,3'-dichlorodiphenylmethane and 4,4'-diamino-3,3'-dimethyl-diphenylmethane. Candidates for hardening using the 4,4'-diaminodiphenylmethanes are polyepoxides that are produced using a known method by the reaction of a polyvalent phenol, a polyvalent polynuclear phenol or an aliphatic polyvalent alcohol with an epihalohydrin or dihalohydrin in the presence of a base. 1 tab. (ERA citation 14:011520)