Vinyl Chloride → Vinyl chloride-vinyl acetate

Participants

Reaction Conditions

Reaction Steps

Deionized water 600 g, a monomer mixture consisting of vinyl chloride monomer 438.8 g (97.5% by weight on the basis of the total amount of whole charged monomer) and vinyl acetate 11.2 g (2.5% by weight on the basis of the total amount of whole charged monomer), and potassium persulfate 2.25 g were charged into a 2.5 L autoclave. This reactive mixture was stirred by a stirring blade so as to maintain a rotation speed of 120 rpm, and the polymerization was initiated by raising temperature of the reaction mixture up to 60° C. A 5% by weight aqueous solution of sodium dodecyl benzene sulfonate 180 g (2% by weight on the basis of the total amount of whole charged monomer) were continuously added from the polymerization initiation to 4 hr after the initiation. When the polymerization system had a polymerization pressure drop of 0.6 MPa from the saturated vapor pressure of vinyl chloride monomer at 60° C., the polymerization was terminated, and the remaining monomer was recovered to obtain the vinyl chloride-vinyl acetate type emulsion.

Provenance & Evidence