Method for preventing polymer scale deposition in the polymeriza

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...

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5263442, 526346, 526342, C08F 218, C08F 222, C08F 220, C08F 224

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042726220

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 polymerization reactor, said polymerization being hitherto conducted in a glass-lined reactor due to the lack of an efficient method for preventing polymer scale deposition on the stainless steel surfaces.

REFERENCES:
patent: 3669946 (1972-06-01), Koyanagi et al.

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