Patent ID: 8119701

Claim:
A method of manufacturing extruded polymeric foam, comprising: preparing a polymeric melt from a major amount of a polymer composition having a melt flow index of at least about 2.0 wherein the polymer composition includes a major portion of polystyrene by weight and a minor amount of an adipate having the formula injecting a blowing system into the polymeric melt to form a foamable mixture, the blowing system comprising CO 2 , one or more blowing agent, and optionally water, said one or more blowing agent being selected from HCFC-22, HCFC-123, HCFC142b, HFC-134a, HFC-152a, HCFC-141b and mixtures thereof; and extruding the foamable mixture through a die at a die pressure into a region of reduced pressure to form said extruded polymeric foam.