Method for the polymerization of vinyl chloride monomer in an aqeous medium
USRE33284E · kind E · reissue
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11References
4Claims
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Key dates
| Filing date | Nov 30, 1987 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Nov 30, 2007 |
Classification
- Technology area (CPC —)General
Abstract
The invention provides an improvement in the suspension polymerization of vinyl chloride in an aqueous medium in the presence of a monomer-soluble polymerization initiator, according to which the amount of polymer scale deposition on the reactor walls can be greatly decreased. The improvement comprises admixing the aqueous polymerization medium with (a) a water-soluble crosslinked copolymer of an unsaturated carboxylic acid monomer, e.g. acrylic acid, and a crosslinking monomer such as di(methyl)allyl ether of diethyleneglycol and (b) a non-ionic surface active agent in combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.