Abstract: This invention relates to an improved hydrogenation process wherein methylenedianiline is reduced to form bis(para-aminocyclohexyl)methane (PACM). The process contemplates contacting methylenedianiline and hydrogen in the presence of a two component metal catalyst comprising rhodium and ruthenium under mild hydrogenation conditions. Use of the mixed metal catalyst system allows one to obtain a preselected isomer ratio having from about 5-40% by weight, typically 14`28% by weight of the trans,trans- configurational isomer.

Abstract: This invention relates to an improved hydrogenation process wherein methylenedianiline is reduced to form bis(para-aminocyclohexyl)methane (PACM). The process contemplates contacting methylenedianiline and hydrogen in the presence of a two component metal catalyst comprising rhodium and ruthenium under mild hydrogenation conditions. Use of the mixed metal catalyst system allows one to obtain a preselected isomer ratio having from about 5-40% by weight, typically 14-28% by weight of the trans,trans- configurational isomer.

Abstract: A composition for preparing polyurethanes comprising an organic polyisocyanate; a poly(silyldiamine) of the unit formula ##STR1## wherein the grouping ##STR2## is a divalent organic radical terminated by two nitrogen atoms with R being a divalent organic moiety, or a divalent alicyclic radical in which R and R.sup.1 with the two nitrogens form a cyclic diamine structure, R.sup.1 is hydrogen or a monovalent hydrocarbon, R.sup.2 is a monovalent hydrocarbon, and n is an integer greater than 1; and a polyol. When poly(silyldiamines) of the above formula are reacted with a polyisocyanate prepolymer and a polymeric polyol, elastomeric polyurethanes having good elastomeric properties are obtained.