Method of making expandable polyphenylene ether and polyolefin b

Details Method of making expandable polyphenylene ether and polyolefin b Method of making expandable polyphenylene ether and polyolefin b

1991-10-28

1995-02-14

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 51, 521 56, 521 59, 521 60, B29C 6722

Patent

active

053893204

ABSTRACT:
A process for producing expandable particles of a melt compounded blend of polyphenylene ether resin and polyolefin resin. A melt compounded blend of polyphenylene ether resin and polyolefin resin, a blowing agent and water are mixed in a pressure vessel to form a dispersion; the dispersion is heated in the sealed pressure vessel to impregnate the blowing agent in the melt compounded blend of resin particles; the dispersion is then cooled in the sealed pressure vessel; and a cooled blowing agent-impregnated, melt compounded blend of resin particles is removed from the reactor. A preferred blowing agent is Freon.RTM. 11. The particles are pre-expanded by heating, and the pre-expanded particles can be foamed in a conventional mold when heat is applied thereto. A resin molding composition comprising a melt compounded blend of heat-pre-expanded, low density, resilient polyphenylene ether resin and polyolefin resin particles having about 95.0 weight percent to about 5.0 weight percent polyphenylene ether resin based on the total weight of the polyphenylene ether resin and polyolefin resin, is obtained by the above process.

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