Patent ID: 8142695
Filing Date: 2012-03-27
Classification: C08J

Abstract:
1. A method for making a polymer foam comprising vacuum or gas-filled compartments by a) making a solution of 1 to 20% by weight of a polymer in NMP/CaCl b) adding particles to the polymer solution; and c) solidifying the polymer wherein the particles are contained by heating, cooling, ageing, or coagulating to obtain a polymer foam or matrix comprising the particles, and obtaining from the polymer matrix the polymer foam containing the compartments; wherein in step b) i) the particles are inert hollow particles, wherein the hollow part is the vacuum or gas-filled compartment to give the polymer foam; or ii) the particles are solid particles that are insoluble in the NMP/CaCl iii) the particles are expandable particles that upon dissolution in the NMP/CaCl