a process for reducing the carbonyl group of a polyketone consisting of a carbon monoxide ethylene - based copolymer , comprising reacting a blend of carbon monoxide ethylene - based polymer with a metal alkoxide in a molten condition in proportions to provide a novel polyalcohol . this chemical modification changes the properties of the carbon monoxide ethylene - based polymers and renders them eligible for uses for which the original polymers were not or not very suitable .