Polymerizing vinyl chloride in carbon dioxide
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United States of America Patent
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Jul 10, 2001
Grant Date -
N/A
app pub date -
Jun 9, 1999
filing date -
Jun 9, 1999
priority date (Note) -
Expired
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Abstract
Disclosed is a method of polymerizing vinyl chloride or vinylidene chloride monomer. A mixture is prepared of (1) a monomer selected from the group consisting of vinyl chloride, vinylidene chloride, and mixtures thereof with up to about 20 wt % of a comonomer, (2) supercritical carbon dioxide, subcritical carbon dioxide, or liquid carbon dioxide in a weight ratio to the monomer of about 0.5 to about 5; and (3) about 0.1 to about 1 phr of a free radical initiator that is soluble in said supercritical carbon dioxide or a solution of said a free radical initiator in a solvent that is miscible with the carbon dioxide. The mixture is heated to a temperature of about 40 to about 70.degree. C. to polymerize the monomer.
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