Foamable composition and process for making large cell size alke

Details Foamable composition and process for making large cell size alke Foamable composition and process for making large cell size alke

1992-08-07

1993-09-14

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 87, 521 88, 521 97, 521 98, 521146, 521910, C08J 914

Patent

active

052449289

ABSTRACT:
Disclosed is a process for making extruded, closed-cell alkenyl aromatic polymer foam structure having an average cell size of from about 0.3 to about 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 temperature prior to extrusion through a die: and d) extruding the foamable gel through a die to form the foam structure. Further disclosed is a foamable gel capable of forming an alkenyl aromatic polymer foam structure having an average cell size of from about 0.3 to about 3.0 millimeters.

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