Degradable foam materials

A rigid resin foam which is degradable by hydrolysis having a density of less than 20 pounds per cubic feet comprising cells having thin walls comprised of at least 50 molar % of star-shaped polymer having a central residue of a polyfunctional compound having 3-100 amino and/or hydroxyl groups and 5-10,000 carbon atoms, the central residue having polymeric arms with a number average molecular weight of 1,000-50,000 attached to the amino and/or hydroxyl groups which arms are formed of polylactide, polyglycolide, polycaprolactone or mixtures thereof, at least 50% of which cells are closed and contain a significant amount of inert environmentally benign blowing agent.