Process for the production of expanded particles of a polymeric material
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United States of America Patent
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Nov 3, 1987
Grant Date -
N/A
app pub date -
Apr 24, 1985
filing date -
Apr 28, 1984
priority date (Note) -
Expired
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Abstract
A process is disclosed for the production of expanded particles of polymeric material wherein unexpanded particles of the material are contacted with a nitrogen-containing inorganic gas under a first pressure condition to impregnate the particles with the gas. The gas impregnated particles are heated to a temperature higher than the softening point of the material, and dispersed into a liquid medium. The resulting dispersion is subjected to a lower pressure to expand the particles. The expanded particles may be used as prefoamed particles for the molding of foamed articles.
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