Production method of prefoamed particles of polyolefin resin

Details Production method of prefoamed particles of polyolefin resin Production method of prefoamed particles of polyolefin resin

1988-05-11

1989-12-26

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 51, 264DIG9, 264DIG13, 264DIG15, 264DIG16, 521 60, C08J 922, C08J 914, C08J 942

Patent

active

048896713

ABSTRACT:
Prefoamed particles of a polyolefin resin are produced by dispersing starting particles of the polyolefin resin, which contains a volatile foaming agent, in a dispersant in a pressure vessel, heating the resultant dispersion to a temperature of at least the softening point of the starting particles in said pressure vessel and then opening the vessel at one end thereof so as to release the starting particles and dispersant into an atmosphere of a pressure lower than the internal pressure of the vessel. The release of the starting particles and dispersant is performed while feeding a heating liquid.

REFERENCES:
patent: 4524154 (1985-06-01), Maeda et al.
patent: 4525485 (1985-06-01), Maeda et al.
patent: 4676939 (1987-06-01), Kuwabara
patent: 4704239 (1987-11-01), Yoshimura et al.

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