Closed cell alkenyl aromatic polymer and process of making same

Details Closed cell alkenyl aromatic polymer and process of making same Closed cell alkenyl aromatic polymer and process of making same

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2140646

Disclosed is a process for making extruded, closed-cell alkenyl aromatic polymer foam structure having an average cell size of from 0.3 to 3.0 millimeters. The process comprises: (a) heating an alkenyl aromatic polymer material having greater than 50 percent by weight alkenyl aromatic monomeric units to form a melt polymer material; (b) incorporating into the melt polymer material at an elevated pressure a blowing agent comprising at least 50 percent by weight 1,1-difluoroethane (HFC-152a) based upon the total weight of the blowing agent to form a foamable gel; (c) cooling the Foamable gel to an optimum foaming tempera- ture prior to extrusion through a die; and (d) extruding the foamable gel through a die to form the foam structure. Further dis- closed is a foam structure made according to the above process.

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