| abstract |
Poly(oxytetramethylene) diamines useful in the preparation of polyamide and polyurea elastomers are prepared by the catalytic reductive amination of a poly(oxytetramethylene) glycol feedstock under reductive amination conditions in the presence of ammonia and hydrogen using a hydrogenation/dehydrogenation catalyst composed of, on an oxide-free basis, about 70 to 75 wt. % of nickel, about 20 to about 25 wt. % of copper, about 0.5 to 5 wt. % of chromium and about 1 to 5 wt. % of molybdenum. |