Abstract: The present invention relates to a method of preparing a vinyl chloride-based polymer, which comprises bulk-polymerizing a vinyl chloride-based monomer in the presence of an initiator (Step 1); and preparing a vinyl chloride-based polymer after the bulk polymerization (Step 2), wherein a phosphite is added in the step 1, a vinyl chloride-based polymer, and a vinyl chloride-based polymer composition comprising the vinyl chloride-based polymer.

Abstract: The present invention relates to a vinyl chloride-based copolymer which has good processability and thus is capable of providing molded articles having good appearance characteristics, for example, transparency, a method for preparing the same, a thermoplastic resin composition containing the same, and a thermoplastic resin molded article produced from the thermoplastic resin composition. The vinyl chloride-based copolymer includes N-vinyllactam-based polymer compound derived units and unsaturated fatty acid ester derived units at an appropriate ratio, and may have improved structure stability and good processability due to the N-vinyllactam-based polymer compound derived units and improved plasticity and processability due to the internal plasticizer action of the unsaturated fatty acid ester derived units. Therefore, the vinyl chloride-based copolymer according to the present invention may be easily applied in industries that need thereof.

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.

Abstract: Disclosed are a chloroethylene-based nanocomposite composition comprising a chloroethylene-based resin; a nanoclay comprising a coupling agent bonded thereto; and at least one polymer selected from unsaturated organic acid-based resins or polycarboxylic acid-based resins, and a method of preparing the same.

Abstract: The present invention relates to a vinyl chloride-based polymer containing an unsaturated fatty acid ester at a specific ratio, a method for preparing the same, a thermoplastic resin composition containing the same, and a thermoplastic resin molded article produced from the composition. The vinyl chloride-based polymer may have good processability, and thus, the thermoplastic resin molded article produced from the thermoplastic resin composition containing the vinyl chloride-based polymer may have high impact strength and improved appearance characteristics.

Abstract: The present invention relates to a method of preparing a vinyl chloride-based copolymer having excellent plasticity and processability, a vinyl chloride-based copolymer prepared thereby, a thermoplastic resin composition including the vinyl chloride-based copolymer, and a thermoplastic resin molded article prepared from the composition. Since the preparation method may improve copolymerizability with a vinyl chloride-based monomer by continuously adding or dividedly adding an unsaturated fatty acid ester mixture used as a comonomer during the time of specific polymerization conversion rate, the unreacted unsaturated fatty acid ester mixture may be reduced, and, as a result, the conversion rate of the vinyl chloride-based copolymer may be significantly improved. Thus, plasticity and processability of a vinyl chloride-based copolymer prepared by the above method may be significantly improved.

Abstract: The present invention relates to a method of preparing a vinyl chloride-based polymer, which includes inducing the nucleation of particles by adding a mercaptan-based chain transfer agent to a monomer composition including a vinyl chloride-based monomer and a preliminary polymerization initiator (preliminary polymerization); and preparing a polymer by mixing a vinyl chloride-based monomer and the particle nuclei and adding a main polymerization initiator (main polymerization). In the preparation method, a vinyl chloride-based polymer having a uniform molecular weight distribution and a desired number average molecular weight may be provided by controlling a degree of polymerization of a vinyl chloride-based polymer prepared in such a way that dispersibility is ensured by adjusting the point of time to add the mercaptan-based chain transfer agent to the point of time to reach a specific conversion rate of the preliminary polymerization.

Abstract: The present invention relates to a method for preparing a vinyl chloride-based polymer, to a vinyl chloride-based polymer, and to a vinyl chloride-based polymer composition comprising same, the method comprising: a first step of bulk polymerizing a vinyl chloride-based monomer under the presence of an initiator; and a second step of obtaining a vinyl chloride-based polymer after completing the bulk polymerization, wherein a phosphite is input in the first step.

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.

Abstract: Provided are a vinyl chloride-based copolymer, as a secondary particle in which primary particles are assembled, which may exhibit excellent mechanical properties and transparency as well as excellent plasticity by having an average pore diameter of 100 nm or less and a porosity of 40 vol % or less, including 65 wt % to 97 wt % of a vinyl chloride-based monomer-derived repeating unit; and 3 wt % to 35 wt % of cis and trans isomers of an unsaturated fatty acid ester-derived repeating units, and including the repeating units respectively derived from the cis and trans isomers of the unsaturated fatty acid ester in a weight ratio of 60:40 to 99:1, and a method of preparing the same.

Abstract: The present invention relates to vinyl-based thermoplastic resin composition having excellent thermal stability, which comprises a metal complex agent, and a first vinyl-based monomer and a second vinyl-based monomer having different iron ion concentration from each other, a method for manufacturing thereof, and vinyl-based thermoplastic resin manufactured therefrom. The accompanying vinyl-based thermoplastic resin composition can enhance thermal stability, and the vinyl-based thermoplastic resin manufactured from the composition may have excellent thermal stability. Thus, it can be easily applied to industries requiring thereof, in particular, industries of vinyl-based thermoplastic resin and its mold processed goods.

Abstract: The present invention relates to a vinyl chloride-based copolymer which has good processability and thus is capable of providing molded articles having good appearance characteristics, for example, transparency, a method for preparing the same, a thermoplastic resin composition containing the same, and a thermoplastic resin molded article produced from the thermoplastic resin composition. The vinyl chloride-based copolymer includes N-vinyllactam-based polymer compound derived units and unsaturated fatty acid ester derived units at an appropriate ratio, and may have improved structure stability and good processability due to the N-vinyllactam-based polymer compound derived units and improved plasticity and processability due to the internal plasticizer action of the unsaturated fatty acid ester derived units. Therefore, the vinyl chloride-based copolymer according to the present invention may be easily applied in industries that need thereof.

Abstract: Provided are a vinyl chloride-based copolymer, as a secondary particle in which primary particles are assembled, which may exhibit excellent mechanical properties and transparency as well as excellent plasticity by having an average pore diameter of 100 nm or less and a porosity of 40 vol % or less, including 65 wt % to 97 wt % of a vinyl chloride-based monomer-derived repeating unit; and 3 wt % to 35 wt % of cis and trans isomers of an unsaturated fatty acid ester-derived repeating units, and including the repeating units respectively derived from the cis and trans isomers of the unsaturated fatty acid ester in a weight ratio of 60:40 to 99:1, and a method of preparing the same.

Abstract: The present invention relates to a vinyl chloride-based polymer containing an unsaturated fatty acid ester at a specific ratio, a method for preparing the same, a thermoplastic resin composition containing the same, and a thermoplastic resin molded article produced from the composition. The vinyl chloride-based polymer may have good processability, and thus, the thermoplastic resin molded article produced from the thermoplastic resin composition containing the vinyl chloride-based polymer may have high impact strength and improved appearance characteristics.

Abstract: The present invention relates to a method of preparing a vinyl chloride-based copolymer having excellent plasticity and processability, a vinyl chloride-based copolymer prepared thereby, a thermoplastic resin composition including the vinyl chloride-based copolymer, and a thermoplastic resin molded article prepared from the composition. Since the preparation method may improve copolymerizability with a vinyl chloride-based monomer by continuously adding or dividedly adding an unsaturated fatty acid ester mixture used as a comonomer during the time of specific polymerization conversion rate, the unreacted unsaturated fatty acid ester mixture may be reduced, and, as a result, the conversion rate of the vinyl chloride-based copolymer may be significantly improved. Thus, plasticity and processability of a vinyl chloride-based copolymer prepared by the above method may be significantly improved.

Abstract: The present invention relates to vinyl-based thermoplastic resin composition having excellent thermal stability, which comprises a metal complex agent, and a first vinyl-based monomer and a second vinyl-based monomer having different iron ion concentration from each other, a method for manufacturing thereof, and vinyl-based thermoplastic resin manufactured therefrom. The accompanying vinyl-based thermoplastic resin composition can enhance thermal stability, and the vinyl-based thermoplastic resin manufactured from the composition may have excellent thermal stability. Thus, it can be easily applied to industries requiring thereof, in particular, industries of vinyl-based thermoplastic resin and its mold processed goods.

Abstract: Disclosed are a bulk PVC composition and a bulk PVC polymerization method using the same. According to the present invention, a bulk PVC composition that may effectively prevent generation of fine particles and scale (adhering to a reactor wall) during bulk polymerization and may be prepared without a post-treatment process of an antistatic agent added to easily isolate fine particles after bulk PVC polymerization, and a method and apparatus for polymerizing the same may be provided.

Abstract: Disclosed are a chloroethylene-based nanocomposite composition and a method of preparing the same. More particularly, disclosed are a chloroethylene-based nanocomposite composition comprising a chloroethylene-based resin; a nanoclay comprising a coupling agent bonded thereto; and at least one polymer selected from unsaturated organic acid-based resins or polycarboxylic acid-based resins, and a method of preparing the same. According to the present disclosure, a uniformly dispersed water dispersion suspension may be provided by enhancing water dispersion effects of the nanoclay, and superior tensile strength may be exhibited by using the uniformly dispersed water dispersion suspension in chloroethylene-based suspension polymerization, and a chloroethylene nanocomposite having superior transparency may be provided.

Abstract: Disclosed are a bulk PVC composition and a bulk PVC polymerization method using the same. According to the present invention, a bulk PVC composition that may effectively prevent generation of fine particles and scale (adhering to a reactor wall) during bulk polymerization and may be prepared without a post-treatment process of an antistatic agent added to easily isolate fine particles after bulk PVC polymerization, and a method and apparatus for polymerizing the same may be provided.

Abstract: A gradient displaying method and a mobile terminal capable of displaying a gradient of a screen during image photographing using a camera of the mobile terminal. A gradient sensor or a horizontal/vertical angle extraction sensor such as a gravitation sensor is mounted to the mobile terminal, and gradient data against the earth's surface converted to a numerical value by an interface with a main processing device or a memory, thereby directly displaying a reference angle or straight line or angle data on the photographing screen, for example, by software. Accordingly, a user can photograph an image with a precise angle.