Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Patent
1992-09-02
1994-01-04
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
526 88, 5263472, C08F 218
Patent
active
052761134
ABSTRACT:
There is provided a suspension polymerization process for production of polymer particles having a substantially uniform size, which process comprises the steps of: (a) applying regular vibration to a flow of a monomer liquid which has a specific gravity smaller than that of an aqueous dispersion medium, (b) introducing the aqueous dispersion medium containing the droplets in a first reactor comprising a recycling means which discharges the aqueous dispersion medium from the bottom of the reactor and recycles it to the top of the reactor, (c) partially polymerizing the monomer liquid in the first reactor so that the specific gravity of the droplets does not exceed that of the aqueous dispersion medium while maintaining the suspended condition of the droplets, and (d) discharging the partially polymerized droplets together with the aqueous dispersion medium from a lower portion of the first reactor and introducing them in a second reactor, and (e) further polymerizing the partially polymerized droplets in the second reactor.
REFERENCES:
patent: 3922255 (1975-11-01), Koestler et al.
patent: 4444961 (1984-04-01), Timm
patent: 4487898 (1984-12-01), Kato et al.
patent: 4666673 (1987-05-01), Timm
Hashiguchi Yoshiyuki
Kishi Masakiti
Yagyu Takehiko
Kanegafuchi Chemical Industry Co. Ltd.
Schofer Joseph L.
Weber Tom
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