Tokuyama Sekisui Kogyo Kabushiki Kaisha

Tokuyama Sekishi Kogyo Kabushiki Kaisha

Michifumi Tanga

Akio Hata

Terufumi Adachi

A method for removing polymer scales adhering to the inner surface of a polymerization vessel, which comprises polymerizing vinyl chloride monomer in an aqueous medium, discharging the resulting vinyl chloride polymer together with the aqueous medium from the polymerization vessel, thereafter placing in the vessel both a reaction product resulting from the reaction of an amine and acrylic acid or its derivative and an organic liquid which can dissolve or swell the polyvinyl polymer, and washing the inner surface of the vessel with the organic liquid solution of the reaction product.

Process for removing polymer scale adhering to a polymerization vessel

The formation of scale on the inner surfaces of a vessel used for suspension polymerizing vinyl chloride is inhibited by applying a ternary reaction product of furfural, a polyamine and a phenol to said inner surfaces or by adding the ternary product to the polymerization system.

Process for inhibiting the formation of scale in the suspension

A method for preparing foams of chlorinated vinyl chloride polymers is provided. The foams are prepared by impregnating the chlorinated vinyl chloride polymer with an aliphatic alcohol of from 1 to 5 carbon atoms and thereafter heating the impregnated polymer.

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Shinnan'yo, Japan

Michifumi Tanga