Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Organic polymerization
Patent
1985-04-08
1987-08-18
Marcus, Michael S.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Organic polymerization
422112, 422113, 422131, 521 60, C08J 918, B01J 1000
Patent
active
046876413
ABSTRACT:
A process and apparatus for preparing pre-expanded particles of a thermoplastic resin which comprises; heating under an elevated pressure an aqueous dispersion comprising thermoplastic resin particles containing a volatile foaming agent and an aqueous medium in a pressure vessel; releasing the dispersion from the pressure vessel into a space within a sealed low-pressure vessel wherein the pressure is lower than that in the pressure vessel, whereby expanding the thermoplastic resin particles to give pre-expanded particles; and simultaneously recovering the foaming agent volatilized from the thermoplastic resin particles by discharging the foaming agent out of the space in the low-pressure vessel with controlling the pressure in the low-pressure vessel to substantially a given pressure. According to the process, the release of the volatile foaming agent into the air is prevented.
REFERENCES:
patent: 1548971 (1925-08-01), Ziska, Jr.
patent: 3743694 (1973-07-01), Cichelli et al.
patent: 4063565 (1977-12-01), Edwards et al.
patent: 4448901 (1984-05-01), Senda et al.
Fukui Hisatoshi
Maeda Hirofumi
Nakamura Kyoichi
Kanegafuchi Kogaku Kogyo Kabushiki Kaisha
Marcus Michael S.
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