Lg Chem, Ltd

Jung Rae Lee

Kyung Seog Youk

Hyun Min Lee

Heung Kwon Bae

Kyung Hyun Kim

Joong Chul Lim

Se Woong Lee

Kwang Jin Lee

Chan Hee Lee

Min Jeong Kang

Jae Bum Seo

Jung Tae Park

Yong Jin Kim

Ji Uk Jang

The present disclosure relates to a method of preparing a graft polymer, which includes: performing primary continuous polymerization by adding a diene-based rubber polymer and an aromatic vinyl-based monomer to a first reactor; and performing secondary continuous polymerization by adding the polymerization product discharged from the first reactor, a maleimide-based monomer, and a vinyl cyanide-based monomer to a second reactor.

Method of preparing graft polymer

The present invention provides a method for preparing a vinyl chloride-based polymer, the method including (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 (D) than the second vinyl chloride-based polymer, and two kinds of polymers having different physical properties may be prepared through a single manufacturing process.

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

The present invention provides a post-treatment method of a vinyl chloride-based polymer including: (a) preparing a stream containing vinyl chloride-based polymer powder and unreacted vinyl chloride-based monomers by drying a vinyl chloride-based polymer latex in a drying unit; (b) filtering the stream containing the vinyl chloride-based polymer powder and the unreacted vinyl chloride-based monomers in a filtering unit; and (c) recirculating a gas containing the unreacted vinyl chloride-based monomers discharged from the filtering unit to a latex storage unit.

Post-treatment method of vinyl chloride-based polymer and closed post-treatment system for the same

The present disclosure provides a method for preparing a polymerization initiator composition, including (a) a step of mixing water and a water-soluble initiator to prepare an aqueous initiator solution having a concentration of 1 to 10%; and (b) a step of activating the aqueous initiator solution, wherein the step of activating is performed by (b-1) a step of heat treating the aqueous initiator solution for 0.5 to 4.5 hours at a temperature of 48 to 62° C.; and (b-2) a step of treating the aqueous initiator solution to achieve pH of 1 to 7, where the steps above are performed in no particular order.

Method for preparing polymerization initiator composition

The present disclosure provides a composition for preparing a vinyl chloride-based polymer, including a vinyl chloride-based first seed; a vinyl chloride-based second seed; an initiator composition including a water-soluble initiator and an oil-soluble initiator; a reducing agent; and a vinyl chloride-based monomer, wherein a metal catalyst is not included in the composition, and a method for preparing a vinyl chloride-based polymer using the same.

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

The present invention relates to a vinyl chloride-based polymer showing high viscosity properties in a low shear region and showing viscosity and stress decreasing properties in line with the increase of a shear rate, a method for preparing the same, and a plastisol comprising the same. Since the vinyl chloride-based polymer comprises a saponified emulsifier in a specific ratio, high viscosity properties may be shown in a low shear region, and Bingham fluid flow properties may be shown, by which viscosity and stress decrease in line with the increase of a shear rate.

Method for preparing polyvinyl chloride

The present invention relates to a vinyl chloride-based polymer composition and a method for producing the same, and more particularly, to a vinyl chloride-based polymer composition including a vinyl chloride-based polymer and a plasticizer, wherein the vinyl chloride-based polymer includes a higher fatty acid having 10 to 18 carbon atoms in an amount of more than 0.05 parts by weight to less than 2.0 parts by weight, based on 100 parts by weight of the vinyl chloride-based polymer.

Vinyl chloride-based polymer composition and method for producing the same

The present invention relates to a vinyl chloride-based polymer, a method of preparing the same, and a plastisol including the vinyl chloride-based polymer. The vinyl chloride-based polymer according to the present invention may exhibit high viscosity characteristics in a low shear region by having particle size distribution characteristics, in which particles having a relatively small particle diameter and particles having a relatively large particle diameter are distributed at a specific ratio, and may exhibit low viscosity characteristics in a high shear region due to small increases in viscosity and stress as shear rate increases, and thus, the vinyl chloride-based polymer may be easily used in a spray coating process. Therefore, the vinyl chloride-based polymer according to the present invention and the method of preparing the same may be easily applied to industries that need them, for example, vinyl chloride-based resin industry for paste processing.

Vinyl chloride-based polymer, method of preparing the same, and plastisol including the polymer

The present invention relates to a vinyl chloride-based polymer which has improved thermal stability and a method for preparing the same. The vinyl chloride-based polymer includes silicate compound derived units, and a dehydrochloric acid (dehydrochlorination) reaction due to heat or ultraviolet rays may be suppressed, and thus, thermal stability may be improved, and discoloration and deformation of physical properties may be prevented. Accordingly, the vinyl chloride-based polymer and the method for preparing the same may be readily applied to industries requiring a vinyl chloride-based polymer, for example, industries related to a vinyl chloride-based resin and molded articles thereof.

Vinyl chloride-based polymer and method for preparing the same

The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. In the preparation method through bulk polymerization, a modifier is introduced to a polymerization process to impart the vinyl chloride polymer with high thermal stability without inducing modification. Therefore, the preparation method via the bulk polymerization of the vinyl chloride polymer and the vinyl chloride polymer prepared thereby according to the present invention may be readily applied to industries requiring thereof such as industries concerning a vinyl chloride resin and the molded article thereof.

Vinyl chloride polymer and preparation method thereof

The present invention relates to a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a method of preparing the same. The generation of the dehydrochlorination of the vinyl chloride polymer due to heat or ultraviolet rays may be markedly restrained, the thermal stability thereof may be improved, and the discoloration thereof or the modification of the physical properties thereof may be prevented. In addition, a modifier may be introduced to a polymerization process at the end of the polymerization, and high thermal stability may be attained without generating the transformation of the vinyl chloride polymer.

The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability by restraining a dehydrochlorination reaction due to heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. According to the preparation method, the adding point of a modifier is controlled, and a vinyl chloride polymer markedly restraining the generation of dehydrochloric acid due to heat or ultraviolet rays may be prepared. Therefore, the preparation method of the vinyl chloride polymer via the emulsion polymerization and the vinyl chloride polymer prepared thereby in the present invention may be readily applied to industries requiring the vinyl chloride polymer such as industries concerning a vinyl chloride resin and a molded article.

Preparation method of vinyl chloride polymer and vinyl chloride polymer prepared thereby

The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. In the preparation method, a modifier is introduced at the end of a polymerization process to impart the vinyl chloride polymer with high thermal stability without inducing modification. Therefore, the generation of dehydrochlorination due to heat or ultraviolet rays may be markedly restrained, thermal stability may be improved, and discoloration or the modification of physical properties may be prevented in the vinyl chloride polymer thus prepared.

Growing community of inventors

Daejeon, South Korea

Jung Rae Lee