| abstract |
(57) [Summary]nThe present invention relates to a method for producing an extruded polymer foam for producing cells having a rounder shape. By using titanium dioxide and talc together in an extruded foam manufacturing process, more rounded shaped cells are created. A method of making an extruded polymer foam comprises heating a resin mixture comprising a polymer, titanium dioxide, talc and optional additives to a first temperature, and applying a first pressure sufficient to prevent gel foaming. Mixing the resin mixture with one or more blowing agents to form a gel, cooling the gel to a second temperature, and transferring the gel from the die to a lower pressure second pressure region. Extruding to form a foam. |