US 10,577,441 B2 · Method of preparing vinyl chloride-based polymer and apparatus for preparing vinyl chloride-based polymer

Abstract

The present invention relates to a method of preparing a vinyl chloride-based polymer, which may prepare a vinyl chloride-based polymer with excellent surface properties by adjusting a foam level generated during a polymerization reaction to an appropriate value, a vinyl chloride-based polymer prepared thereby, and an apparatus for preparing a vinyl chloride-based polymer which may prepare the vinyl chloride-based polymer. The method of preparing a vinyl chloride-based polymer according to the present invention may prepare a vinyl chloride-based polymer with excellent surface properties, for example, fewer occurrences of fish-eyes and excellent transparency, by performing a polymerization reaction while maintaining the level of a foam generated during the polymerization reaction at an appropriate value.

Claims7

Dependent claims

A method of preparing a vinyl chloride-based polymer, the method comprising introducing a reactant including a polymerization initiator, a suspension stabilizer, and a vinyl chloride-based monomer into a polymerization reactor equipped with a reflux condenser on a top thereof and performing suspension polymerization,

wherein the suspension polymerization is performed by adjusting a foam level in the polymerization reactor to be maintained at 10% or less,
the foam level represents a ratio of a thickness of a foam generated on an outermost surface of the reactant to a total height from the outermost surface of the reactant in the polymerization reactor to the top of the polymerization reactor, and
the foam level is adjusted by adding a defoamer,
wherein the defoamer is added when the foam level is in a range of 3% or more to 10% or less.

1 more element

Dependencies are inferred from the claim text.

Method of preparing vinyl chloride-based polymer and apparatus for preparing vinyl chloride-based polymer

Life of this patent

Method of preparing vinyl chloride-based polymer and apparatus for preparing vinyl chloride-based polymer

Life of this patent

Abstract

Claims7