Process for producing pre-foamed particles of polyolefin resin

Details Process for producing pre-foamed particles of polyolefin resin Process for producing pre-foamed particles of polyolefin resin

1982-09-21

1984-03-13

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 264DIG9, 521 56, 521 60, C08J 922, B29D 2700

Patent

active

044368402

ABSTRACT:
In a process for producing pre-foamed particles of a polyolefin resin which comprises impregnating a volatile blowing agent into particles of a polyolefin resin while dispersing the resin particles and the blowing agent in a dispersing medium under heat in a closed vessel, opening one end of the vessel and releasing the resin particles and the dispersing medium simultaneously into an atmosphere kept at a lower pressure than the inside pressure of the vessel; the improvement wherein the pressure of the inside of the vessel after opening its one end is maintained at a substantially constant pressure which is at least 0.7 times the vapor pressure of the blowing agent before opening the end of the vessel.

REFERENCES:
patent: 3428720 (1969-02-01), Deuslow
patent: 4032609 (1977-06-01), Smith

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