Patent ID: 7919538

Claim:
A polymer foam comprising a polymer composition having cells defined therein, the polymer composition containing styrene acrylonitrile polymer and an infrared attenuating agent wherein the amount of polymerized acrylonitrile in the polymer composition is one weight-percent or more based on polymer composition weight, wherein the polymer foam is an extruded polymer foam that is free from having a network of bead skins characteristic of an expanded bead foam, and wherein the infrared attenuating agent is selected from carbon black and graphite and is present at a concentration of one weight-percent or more and five weight-percent or less based on total polymer weight in the polymer foam and wherein the total amount of acrylonitrile component in the styrene acrylonitrile copolymer is more than four weight-percent of the total weight of all polymers in the polymer composition.