Process for producing prefoamed polymer particles

Details Process for producing prefoamed polymer particles Process for producing prefoamed polymer particles

1983-12-13

1984-08-07

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, 264 53, 264DIG9, 264DIG15, 521 56, 521 60, C08J 922

Patent

active

044644841

ABSTRACT:
Prefoamed polymer particles having excellent moldability are produced by a process comprising a step (impregnating step) of impregnating carbon dioxide or carbon dioxide and a volatile blowing agent in polymer particles, a step (dispersing step) of dispersing the polymer particles into a dispersion medium in a sealed vessel, a step (heating step) of heating the polymer particles to a temperature higher than the softening point of said polymer particles, and a step (releasing step) of opening one end of said vessel and simultaneously releasing the polymer particles and dispersion medium from inside the vessel to an atmosphere held at a pressure lower than that of the vessel. In this process, the impregnating step, dispersing step and heating step need not be altogether effected separately. These steps can be performed simultaneously in one and the same vessel.

REFERENCES:
patent: 2864778 (1958-12-01), Mladinich
patent: 3725320 (1973-04-01), Wang

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