Polystyrene foam and process for making the same

Details Polystyrene foam and process for making the same Polystyrene foam and process for making the same

C - Chemistry, Metallurgy

08

L

C08L 25/04 (2006.01) C08J 9/12 (2006.01) C08J 9/228 (2006.01)

Patent

CA 2132448

An improved polystyrene foam having less corrugation is disclosed which uses carbon dioxide as the blowing agent and 1-30 weight percent endothermic agent, such as water, with the weight based on the total carbon dioxide blowing agent and endothermic agent weight. This combination of carbon dioxide and endothermic agent decreases the corrugation of the thermoplastic foam, while just slightly increasing density, when the process parameters, including throughput, are equivalent to using only carbon dioxide. The process also allows an increased foaming temperature and greater process throughput of an equivalent density thermoplastic foam at approximately equivalent corrugation levels when compared to the use of only using carbon dioxide.

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