Diamines used as epoxide hardeners and pre- - pared by ketonitrile hydrogenation

摘要

Diamines for production of mouldings and coatings by polyadduct formation with 1,2-epoxy cpds. contg. over one 1,2-epoxy groups per molecule, opt. admixed with 1,2-monoepoxides, have the formula:- (where R1 and R2 are 1-4C alkyl, R3 and R4 are H or 1-4C alkyl and R3 and R4 can also belong together to a ring with 5-6C atoms, and n is 1,2 or 3) and are prepared by catalytic hydrogenation of ketonitriles at 80-180 degrees C in presence of over 1 mole NH3 at H2 partial pressure above 30 atm. excess pressure.