Processing aids for use in manufacture extruded polystyrene foams using low global warming potential blowing agents

A foamed insulation product formed from a foamable polymeric mixture, the foamable polymeric mixture consisting of:

• polystyrene;
• a blowing agent consisting of carbon dioxide, wherein the carbon dioxide is present in an amount from 0.05 to 5 wt. % of the foamable polymeric mixture;
• from 0.05 to 3 wt. % of an organic phase changing material, wherein the organic phase changing material has a transition temperature from liquid to solid at a temperature from −5 to 60° C., and wherein the organic phase changing material consists of microencapsulated synthetic beeswax;
• and
• optionally, one or more of an infrared attenuating agent, a flame retarding agent, a nucleating agent, a pigment, a biocide, and a UV absorber,
• wherein each wt. % is based upon the total weight of the foamable polymeric mixture,
• wherein the foamed insulation product has an average cell size of from 0.16 to 0.2 mm,
• wherein the foamed insulation product has an insulation R-value per inch of between 4 and 7;
• and
• wherein the foamed insulation product has a compressive strength between 6 and 80 psi.