Method for preventing polymer scale deposition in the polymerization of an ethylenically unsaturated monomer in an aqueous medium
US4272622A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1980 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | May 13, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/004
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention provides a novel method for preventing polymer scale deposition on the reactor walls in the polymerization of vinyl chloride, vinylidene chloride, styrene and other ethylenically unsaturated monomers in an aqueous medium. The inventive method comprises coating the reactor walls, piror to polymerization, with an aqueous coating solution containing a water-soluble ionic polymer and a water-soluble ionic dye having counteractive polarity to the polarity of the water-soluble ionic polymer compound. In other words, a water-soluble anionic dye is used as combined with a water-soluble cationic polymer and a water-soluble cationic dye is used as combined with a water-soluble anionic polymer compound. The scale preventing effect obtained with the combined use of the above two components can be further increased when the aqueous coating solution is admixed with a monovalent alcohol having from 3 to 6 carbon atoms in a molecule owing to the improved spreading of the aqueous solution on the metal surface of the reactor walls. The effect of the method is so remarkable and reliable that polymerization of styrene and other monomers can be performed in a stainless steel polymerizatio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.