Production method of prefoamed particles of polyolefin resin
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United States of America Patent
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Dec 26, 1989
Grant Date -
N/A
app pub date -
May 11, 1988
filing date -
May 11, 1987
priority date (Note) -
Expired
status (Latency Note)
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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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