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

C - Chemistry, Metallurgy

08

J

18/639

C08J 9/22 (2006.01) B29B 9/12 (2006.01) C08J 9/228 (2006.01) C08L 23/00 (2006.01)

Patent

CA 1285727

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.

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