PREPARATION OF VINYL CHLORIDE RESIN

PURPOSE:To eliminate the variation in polymn. time and prepare a vinyl chloride resin in a short time by charging a polymn. kettle with water and additives, feeding a surfactant beneath the water level in the kettle, subjecting the contents in the kettle to a vacuum deaeration treatment, feeding vinyl chloride, and starting the polymn. CONSTITUTION:After a polymn. kettle is charged with water and other additives, a surfactant (e.g. sodium dodecylbenzenesulfonate) is fed beneath the water level in the reactor; the contents of the kettle is subjected to a vacuum deaeration treatment to remove oxygen in the kettle and oxygen dissolved in the water; and vinyl chloride or a mixture thereof with a copolymerizable vinyl monomer (e.g. acrylic acid) is fed thereto to start the polymn. As the surfactant is fed beneath the water level, foaming during the vacuum deaeration treatment is avoided, and thus the polymn. time can be reduced.