Lg Chem, Ltd

Joo Byung Chai

Yu Sung Jung

Tae Young Jeon

Eun Seon Park

Jong Beom Kim

Young Min Kim

Chang Sull Kim

Jin Ho Lee

Keun Hoon Yoo

Bong Keun Ahn

In Seok Kim

Won Deok Han

Chan Hong Lee

Taeyoung Jeon

Chang Hong Lee

Provided are a method of preparing a graft copolymer and a graft copolymer, the method including: batch-adding a first molecular weight controlling agent, a diene-based rubber polymer, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to a reactor to initiate polymerization; and after the initiation of polymerization, continuously adding a second molecular weight controlling agent, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to the reactor to perform polymerization, wherein the second molecular weight controlling agent includes an alkyl styrene-based dimer and a mercaptan-based compound in a weight ratio of 40.0:60.0 to 70.0:30.0, and a weight ratio of the first molecular weight controlling agent and the second molecular weight controlling agent is 5.0:95.0 to 25.0:75.0.

Method of preparing graft copolymer and graft copolymer prepared by the same

Disclosed is a method of preparing a vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound graft copolymer and a method of preparing a thermoplastic resin composition including the same. Also disclosed is a conjugated diene rubber latex having an average particle diameter of 2,400 to 2,800 Å added to enlarged conjugated diene rubber latex obtained by enlarging conjugated diene rubber latex having an average particle diameter of 2,400 to 2,800 Å using a polymer coagulant to prepare bimodal conjugated diene rubber, and a vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound graft copolymer prepared by graft-polymerizing the bimodal conjugated diene rubber.

Method of preparing vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound graft copolymer and method of preparing thermoplastic resin composition including the same

The present invention provides a method of preparing a graft copolymer, which comprises graft emulsion polymerization of a diene-based rubber polymer with an aromatic vinyl-based monomer and a vinyl cyanide-based monomer in the presence of an azo-based initiator having a solubility in water at 20° C. of 10 g/100 g or more and a 10-hour half-life decomposition temperature in water of 80° C. or less, wherein the graft emulsion polymerization is initiated at 45 to 55° C. According to the present invention, a method of preparing a graft copolymer, which allows polymerization to be performed at low temperatures and ensures excellent polymerization stability, can be provided.

Method of preparing graft copolymer

The present invention relates to a thermoplastic resin. More particularly, the present invention relates to a thermoplastic resin that is a graft copolymer having a seed-shell structure and includes a bimodal seed including a large-diameter rubbery polymer having an average particle diameter of greater than 2,000 &#x212b; and 3,500 &#x212b; or less and a small-diameter rubbery polymer having an average particle diameter of 500 &#x212b; to 2,000 &#x212b;; and an aromatic vinyl-vinyl cyan shell, wherein the aromatic vinyl cyan compound is included in an amount of 5% by weight to 28% by weight based on a total weight of the aromatic vinyl-vinyl cyan shell. In accordance with the present invention, a thermoplastic resin having a composition capable of improving graft density, and a thermoplastic resin composition capable of increasing dispersion and having high gloss due to inclusion of the thermoplastic resin are provided.

Thermoplastic resin and thermoplastic resin composition

Provided are a method for preparing a conjugated diene-based polymer and a method for preparing a graft copolymer including the same. The method for preparing a conjugated diene-based polymer includes enlarging a first conjugated diene-based polymer in multiple stages to prepare a second conjugated diene-based polymer, wherein the multi-stage enlargement includes a primary enlargement stage and a secondary enlargement stage, and a weight ratio of acids added in the primary enlargement stage and the secondary enlargement stage is 70:30 to 90:10. A graft copolymer prepared by the above-described method can be used to form a thermoplastic resin molded article excellent in all of plating characteristics, mechanical properties, surface characteristics, colorability, and processability.

Method for preparing conjugated diene-based polymer and method for preparing graft copolymer including the same

The present invention relates to a method for preparing a graft copolymer including polymerizing a conjugated diene-based monomer to prepare a small-size conjugated diene-based polymer; enlarging the small-size conjugated diene-based polymer to prepare a large-size conjugated diene-based polymer; and polymerizing the small-size conjugated diene-based polymer, the large-size conjugated diene-based polymer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer to prepare a graft copolymer, wherein a weight ratio of the small-size conjugated diene-based polymer and the large-size conjugated diene-based polymer is 10:90 to 40:60 in preparing the graft copolymer.

Method for preparing graft copolymer and thermoplastic resin molded article

The present invention relates to a method for preparing a graft copolymer, which includes polymerizing a first conjugated diene-based polymer, a second conjugated diene-based polymer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer, wherein particle size distribution of the first conjugated diene-based polymer is 0.346 to 0.404, and particle size distribution of the second conjugated diene-based polymer is 0.196 to 0.304, a graft copolymer and a thermoplastic resin molded article.

Method for preparing graft copolymer, graft copolymer and thermoplastic resin molded article

The present invention relates to a method of preparing a thermoplastic resin, a method of preparing a thermoplastic resin composition including the same, and a method of manufacturing an injection-molded article using the thermoplastic resin composition. By using a mixture of molecular weight modifiers having different reactivities according to the present invention, coagulation may be performed using a small amount of coagulant, productivity may be increased, and a molded article, which is manufactured using a thermoplastic resin, having excellent appearance characteristics along with superior mechanical strength, processability, or the like may be provided.

Method of preparing thermoplastic resin, thermoplastic resin composition including the same, and method of manufacturing injection-molded article using thermoplastic resin composition

The present invention relates to an ABS graft copolymer, a method of preparing the same, and a thermoplastic resin composition including the same. More specifically, when an ABS graft copolymer is prepared using emulsion polymerization, a phosphate ester-based reactive emulsifier capable of acting as a metal deactivator is added, thereby reducing the amount of undesired residues remaining in the ABS graft copolymer latex. As a result, thermal stability may be improved without adding a heat stabilizer. In addition, compatibility between the ABS graft copolymer and the aromatic vinyl compound-vinyl cyanide compound copolymer may be improved by the phosphate ester-based reactive emulsifier. Therefore, a final molded part having improved impact resistance, e.g., increased impact strength, and having improved appearance quality, e.g., excellent whiteness, while having excellent thermal stability may be prepared.

ABS graft copolymer, method of preparing the same, and thermoplastic resin composition including the same

The present invention relates to a heat-resistant resin and a method of preparing the same. More particularly, the present invention relates to a heat-resistant resin including 100 parts by weight of a styrene based resin and 0.5 to 5 parts by weight of silica having a contact angle of 10 to 60&#xb0; and an average particle diameter of 0.1 nm or more and 100 nm or less, a method of preparing the same and a heat-resistant resin composition including the same. In accordance with the present invention, provided are a heat-resistant resin having a low moisture content and a small content of fine particles while having heat resistance equal to or higher than conventional resins and, accordingly superior cohesion, a method of preparing the same, and a heat-resistant resin composition including the same.

Heat-resistant resin and method of preparing the same

Disclosed are a rubber polymer, a graft copolymer, methods of preparing the same, and an impact and heat resistant resin composition. According to the present invention, provided are rubber latex and a graft copolymer which may realize a product having superior impact resistance, heat resistance and chemical resistance by adding a specific crosslinking regulator to the rubber polymer, methods of preparing the same, and an impact and heat resistant resin composition.

Rubber polymer, graft copolymer, preparation methods therefor, and impact resistant and heat resistant resin composition

The present invention relates to a thermoplastic resin, a method of preparing the thermoplastic resin, and a thermoplastic resin composition including the thermoplastic resin. More particularly, the present invention relates to a thermoplastic resin characterized by maximizing a ratio of monomers grafted to rubber particles and a graft rate so as to maintain a rubber particle shape in a high shear environment and varying the composition of each of monomers grafted to the inside and outside of rubber particles, a method of preparing the thermoplastic resin, and a thermoplastic resin composition having superior impact strength, falling dart impact strength, heat deflection temperature, chemical resistance, and plating adhesion strength due to inclusion of the thermoplastic resin.

Thermoplastic resin, method of preparing thermoplastic resin, and thermoplastic resin composition including thermoplastic resin

The present disclosure relates to a method of preparing a heat-resistant SAN resin. More particularly, the present disclosure provides a method of preparing a heat-resistant SAN resin enabling provision of superior productivity and improved heat resistance and fluidity without generation of odor during processing, and a heat-resistant SAN resin composition prepared by the method.

Method of preparing heat-resistant SAN resin

The present invention relates to a method of preparing a heat-resistant resin, a heat-resistant resin, and a heat-resistant ABS resin. According to the preparation method of the present invention, the heat-resistant resin can be prepared at a high polymerization conversion rate within a shortened polymerization time, and the amount of polymerized coagulum and the content of fine particles upon coagulation are decreased. Accordingly, a heat-resistant resin and a heat-resistant ABS resin composition with enhanced heat deflection temperature and processability are provided.

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Daejeon, South Korea

Joo Byung Chai