Process for the polymerization of polymers of vinyl chloride
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United States of America Patent
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Apr 21, 1987
Issued Date -
N/A
app pub date -
Feb 5, 1985
filing date -
Dec 2, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the production of polymers of vinyl chloride by suspension polymerization, uses as the suspension stabilizer either (A) a methylhydroxypropylcellulose with a methoxy substitution degree of 20-32%, a hydroxypropoxy substitution degree of 2-10%, and a viscosity of 30-70 mPa.s; and/or (B) a suspension agent combination consisting essentially of: (a) methylcellulose with a methoxy substitution degree of 22-34% and a viscosity of 7-20 mPa.s, and (b) methylcellulose with a methoxy substitution degree of 22-34% and a viscosity of 50 mPa.s-4,000 mPa.s and/or methylhydroxypropylcellulose with a methoxy substitution degree of 20-32%, a hydroxypropoxy substitution degree of 2-10%, and a viscosity of 100-3,000 mPa.s, and polymerizes in the presence of 0.4-8% by weight of an ethylene-vinyl acetate copolymer. The resultant polymers are suitable for lowering viscosity of polyvinyl chloride plastisols.
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