Process for making alkenyl aromatic foam packing bodies with car

Details Process for making alkenyl aromatic foam packing bodies with car Process for making alkenyl aromatic foam packing bodies with car

1993-05-11

1994-02-22

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 51, 264143, 521 56, 521 60, 521 79, 521 97, 521 98, C08J 908, C08J 914

Patent

active

052887405

ABSTRACT:
Disclosed is a process for making closed-cell, alkenyl aromatic polymer foam packing bodies. An alkenyl aromatic polymer material is heated to form a melt polymer material. The melt polymer material comprises greater than 50 percent by weight alkenyl aromatic monomeric units. A blowing agent is incorporated into the melt polymer material at an elevated pressure to form a foamable gel. The blowing agent has about 20 weight percent or more based upon the total weight of the first blowing agent selected from the group consisting of carbon dioxide and ethane. The foamable gel is extruded through a die to form a foam strand. The foam strand is pelletized to form a plurality of foam bodies. The bodies are further expanded by exposing them one or more times to heated air or steam. Preferably, the bodies are allowed to age for a preselected period of time after pelletizing and between subsequent expansions. The use of carbon dioxide and/or ethane as blowing agents allows the reduction or elimination of certain blowing agents classified as volatile organic contaminants, which are currently being employed commercially.
Further disclosed is a process for making an article formed from the foam packing bodies. Further disclosed is a process for making discrete foam strands.

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