| 摘要 |
<p>A novel and effective process for preventing deposition of polymer scale on the wall of a reactor during polymerization of a vinyl monomer, particularly suspension polymerization of vinyl chloride, which comprises applying an aqueous coating solution containing (a) an alkali metal or ammonium salt of sulfonic acid type or carboxylic acid type dye or organic sulfonic or carboxylic acid having at least a pair of conjugated double bonds per molecule and (b) polyvinyl alcohol in a specific proportion and having a pH not exceeding 7 on the wall of a reactor prior to conducting the polymerization. In the suspension polymerization of vinyl chloride, a conventional process of using even an organic peroxide having a comparatively large solubility in water as a polymerization initiator unavoidably causes deposition of much polymer scale, whereas the present invention enables the use of an initiator which provides excellent polyvinyl chloride resin products while preventing formation of the scale.</p> |
