Process for preparing vinyl chloride polymer of quality

Details Process for preparing vinyl chloride polymer of quality Process for preparing vinyl chloride polymer of quality

1994-04-28

1995-12-26

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526202, C08F 220

Patent

active

054789001

ABSTRACT:
Vinyl chloride polymer is prepared by suspension polymerization of monomeric vinyl chloride or a mixture of vinyl chloride and another monomer in an aqueous medium while agitating the suspension. A first partially saponified polyvinyl alcohol having a degree of saponification of 60-80 mol % and an average degree of polymerization of 500-1,000 is added as a suspension stabilizer at the start of polymerization, and a second partially saponified polyvinyl alcohol having a degree of saponification of 75-85 mol % and an average degree of polymerization of 1,500-2,700 is added while the conversion is 30% to 60%. The agitating power is controlled to 80-120 kg.multidot.m/s.multidot.ton from the start of polymerization to a conversion of 20 to 50%, and to 130-200 kg.multidot.m/s.multidot.ton from then to the completion of polymerization. The resulting vinyl chloride polymer is of quality as demonstrated by a high bulk density and improved free flow, monomer removal, gelation, and plasticizer absorption as well as minimal fish eye. Scale build-up on the reactor wall is minimized.

REFERENCES:
patent: 3682877 (1972-08-01), Czekay
patent: 3929753 (1975-12-01), Itoh et al.
patent: 4143224 (1979-03-01), Klippert et al.
patent: 4324878 (1982-04-01), Biaggi
patent: 4456735 (1984-06-01), Engelmann
patent: 5292836 (1994-03-01), Kitamura

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