Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1985-04-24
1987-11-03
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 53, 264DIG5, 264DIG9, 264DIG13, 264DIG15, 264DIG16, 425 4R, 521 58, 521 74, C08J 912, C08J 918, C08J 922
Patent
active
047042397
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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Kanbe Masato
Kuwabara Hideki
Yamaguchi Toru
Yoshimura Shohei
Anderson Philip
Japan Styrene Paper Corp.
Yee Stephen F. K.
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