Composition for polymerizing vinyl chloride-based polymer and method for preparing vinyl chloride-based polymer using same

A method for producing a vinyl chloride-based polymer, the method comprising:

• (1) polymerizing a vinyl chloride-based monomer in the presence of a vinyl chloride-based first seed particle, a vinyl chloride-based second seed particle, and an emulsifier;
• and
• (2) separating, after the polymerizing, a first vinyl chloride-based polymer and a second vinyl chloride-based polymer which are in a particulate form,
• wherein the separated first vinyl chloride-based polymer is dried using a fluid bed dryer (FBD), and
• the first vinyl chloride-based polymer has a smaller average particle diameter (D50) than the second vinyl chloride-based polymer,
• wherein the vinyl chloride-based first seed particle is produced by adding a vinyl chloride-based monomer, a first emulsifier, and a polymerization initiator to an aqueous medium, performing polymerization, and continuously adding a second emulsifier during the polymerization,
• wherein the vinyl chloride-based second seed particle is produced by adding a vinyl chloride-based monomer, an emulsifier, and a polymerization initiator to an aqueous medium, homogenizing droplets and then performing polymerization,
• wherein the fluid bed dryer is operated at a temperature of 83° C. to 100° C.