Expandable composition and process for extruded thermoplastic fo

Details Expandable composition and process for extruded thermoplastic fo Expandable composition and process for extruded thermoplastic fo

1993-01-28

1994-09-20

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 50, 521 81, 521 97, 521143, 521910, C08J 908, C08J 914

Patent

active

053489845

ABSTRACT:
An expandable thermoplastic composition is disclosed for extrusion foaming wherein the composition comprises a polyethylene resin; a blowing agent comprising a blend of about 50% by weight of carbon dioxide and about 50% by weight of either normal butane, isobutane, propane, or a mixture of any two or all three hydrocarbons in admixture with the resin in a ratio of about one part blowing agent to about 10 parts resin; zinc oxide nucleation agent in an amount of from about 0.05 to 0.5 kg per 100 kg of the resin; and glycerol monostearate aging modifier in an amount of from about 0.5 to 5 kg per 100 kg of the resin. A process for extrusion foaming of the composition is also disclosed.

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