Vinyl Chloride → Vmch

Beteiligte Stoffe

Reaktionsschritte

An autoclave equipped with a stirrer was charged with methanol, vinyl chloride, vinyl acetate, maleic acid, di(2-ethylhexyl) peroxydicarbonate and partially saponified polyvinyl alcohol, and the temperature was elevated to 60° C. with stirring under an atmosphere of nitrogen gas to initiate the reaction, followed by further continuous injection of vinyl chloride to conduct the copolymerization reaction. After release of the residual pressure of the autoclave and cooling, a copolymer slurry was taken out and filtered, followed by washing with methanol three times and further with deionized water twice, thus obtaining a vinyl chloride-vinyl acetate-maleic acid copolymer powder. This copolymer, methanol, N,N-dimethylethanolamine and sodium hydroxide were added to a reactor equipped with a cooling pipe, and were allowed to react at 40° C. Then, the reaction product was cooled, and acetic acid was added thereto to neutralize unreacted sodium hydroxide. The resulting product was washed with methanol three times and further with deionized water twice, followed by filtering and drying to obtain a vinyl chloride-vinyl acetate-vinyl alcohol-maleic acid-N,N-dimethylethanolamine-modified vinyl unit copolymer powder. Copolymers different in weight ratio of monomers shown in Table 1 were produced by changing the amounts of the respective monomer units or amine compounds.

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