Title:
PRODUCTION OF VINYL CHLORIDE-BASED POLYMER
Document Type and Number:
Japanese Patent JP3230369
Kind Code:
B2
Abstract:
PURPOSE: To obtain vinyl chloride-based polymer having high qualities with few fish eyes in high productivity by preventing polymer scales from sticking to the inside of a polymerizer and enabling the shortening of the heat-up time even in a large-sized polymerizer.
CONSTITUTION: This method for producing a vinyl chloride-based polymer is to keep the temperature in feeding and mixing water, a suspending agent and a vinyl chloride-based monomer at ≥30°C to <45°C, add a polymerization initiator having ≥40°C 10 hour half-life temperature in benzene at 0.1mol/l concentration in an amount of 0.01-0.2wt.% based on the fed monomer and one having <40°C 10 hour half-life temperature in benzene at 0.1mol/l concentration in an amount of 0.001-0.2wt.%, keep a heating medium in a jacket during the heating up at a temperature equal to or higher than that of the fed mixture and lower than (the set polymerization temperature +4°C), raise the temperature of the fed mixture and polymerize the monomer in carrying out the suspension polymerization of the vinyl chloride-based monomer in a jacketed polymerizer.
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Inventors:
Takashi Kobayashi
Yasuo Sugiyama
Norihiko Nakano
Yasuhiro Takahashi
Yoshitaka Okuno
Shuji Onishi
Yasuo Sugiyama
Norihiko Nakano
Yasuhiro Takahashi
Yoshitaka Okuno
Shuji Onishi
Application Number:
JP12067694A
Publication Date:
November 19, 2001
Filing Date:
May 10, 1994
Export Citation:
Assignee:
Shin-Etsu Chemical Co., Ltd.
International Classes:
C08F2/00; C08F2/18; C08F14/00; C08F14/06; (IPC1-7): C08F2/18
Domestic Patent References:
| JP55007A |
Attorney, Agent or Firm:
Takashi Kojima
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