Patent ID: 9115254
Filing Date: 2015-08-25
Classification: B29C,C08J,C08L

Abstract:
1. A foamed resin made of a resin composition having fine bubbles uniformly dispersed therein, wherein the resin composition comprises a blend of a polyolefin base resin and a polymer material other than the polyolefin base resin, the polymer material being dispersed in the polyolefin base resin; the bubbles are generated at boundary regions between the base resin and the dispersed polymer material by infusing a foaming gas into the resin composition at a predetermined processing temperature; the melting point or glass transition temperature of the polymer material is greater than the melting point of the polyolefin base resin and less than the processing temperature; and the foamed resin is produced by a process comprising blending the polyolefin base resin and the polymer material to provide the resin composition, kneading the resin composition, providing the resin composition in a molding machine, heating the resin composition in the molding machine to provide a molten resin composition, infusing a foaming gas into the molten resin composition in the molding machine at the predetermined processing temperature, molding the resin composition, and foaming the resin composition due to a pressure difference between an inside and outside of the molding machine by generating bubbles at boundary regions between the polyolefin base resin and the dispersed polymer material due to a difference between the melting point or glass transition temperature of the polymer material and the melting point of the polyolefin base resin.