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Method for preparing graft copolymer and graft copolymer prepared thereby

A technology for graft copolymers and polymers, applied in the field of graft copolymers, can solve the problems of deterioration of processing performance and surface characteristics, and reduced impact resistance, and achieves a reduced molecular weight distribution, excellent impact resistance, and excellent processing performance. Effect

Pending Publication Date: 2022-05-27
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the weight-average molecular weight or grafting degree of the diene-based graft copolymer is increased to improve the impact resistance of the diene-based graft copolymer, processability and surface properties are deteriorated
In addition, when the degree of grafting of the diene graft copolymer was reduced to improve the processability and surface properties of the diene graft copolymer, the impact resistance decreased instead.

Method used

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  • Method for preparing graft copolymer and graft copolymer prepared thereby
  • Method for preparing graft copolymer and graft copolymer prepared thereby
  • Method for preparing graft copolymer and graft copolymer prepared thereby

Examples

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preparation example Construction

[0041] A method for preparing a graft copolymer according to an embodiment of the present invention includes: adding a first molecular weight modifier, a diene-based rubber polymer, an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to a reaction in batches and a second molecular weight regulator, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer are continuously added to the reactor for polymerization, wherein the second molecular weight regulator comprises weight The alkyl styrene-based dimer and the thiol-based compound in a ratio of 40.0:60.0 to 70.0:30.0, the weight ratio of the first molecular weight modifier to the second molecular weight modifier is 5.0:95.0 to 25.0:75.0 .

[0042] The inventors of the present invention have found that when the continuous addition is performed by adjusting the alkylstyrene-based dimer and the thiol-based compound so that they are contained in the second molecular weight regulator at a specific weight rat...

Embodiment 1

[0089]

[0090] A first mixed solution was prepared, containing 100.0 parts by weight of ion-exchanged water, 58.0 parts by weight (based on solid content) of butadiene rubber polymer latex (average particle size: 300 nm), 7.5 parts by weight of styrene, 2.5 parts by weight of Acrylonitrile, 0.10 part by weight of potassium oleate, 0.050 part by weight of tetrabutyl hydroperoxide, 0.080 part by weight of glucose, 0.050 part by weight of tetrasodium pyrophosphate, 0.001 part by weight of ferrous sulfate (II) and the following table A first molecular weight regulator in the amount shown in 1.

[0091] In addition, a second mixed solution was prepared containing 12.0 parts by weight of ion-exchanged water, 24.0 parts by weight of styrene, 8.0 parts by weight of acrylonitrile, 0.20 parts by weight of potassium oleate, 0.10 parts by weight of tetrabutyl hydroperoxide, and A second molecular weight regulator in the amounts shown in Table 1 below.

[0092] In addition, a third mix...

Embodiment 2 to Embodiment 7 and comparative example 1 to comparative example 10

[0097] A graft polymer powder and a thermoplastic resin composition were prepared in the same manner as in Example 1, except that the first molecular weight regulator and the second molecular weight regulator were added in the amounts shown in Tables 1 to 5 below.

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Abstract

The invention provides a method for preparing a graft copolymer and the graft copolymer. The method comprises the following steps: adding a first molecular weight regulator, a diene-based rubber polymer, an aromatic vinyl-based monomer and a vinyl cyanide-based monomer into a reactor in batches to initiate polymerization; and after initiating polymerization, continuously adding a second molecular weight regulator, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to the reactor to perform polymerization, in which the second molecular weight regulator contains an alkylstyrene-based dimer and a thiol-based compound in a weight ratio of 40.0: 60.0 to 70.0: 30.0, and the second molecular weight regulator contains a vinyl cyanide-based monomer and a vinyl cyanide-based monomer in a weight ratio of 40.0: 60.0 to 70.0: 30.0. The weight ratio of the first molecular weight modifier to the second molecular weight modifier is from 5.0: 95.0 to 25.0: 75.0.

Description

technical field [0001] [Cross-reference to related applications] [0002] This application claims priority and the benefit of Korean Patent Application No. 10-2020-0084052 filed on July 8, 2020 and Korean Patent Application No. 10-2021-0087924 filed on July 5, 2021, both of which The disclosure of this patent application is incorporated by reference into this specification in its entirety. [Technical field] [0003] The present invention relates to a method for preparing a graft copolymer and a graft copolymer prepared therefrom, in particular, to a method for preparing a graft copolymer excellent in surface properties, impact resistance and processability, and a method for preparing a graft copolymer with excellent surface properties, impact resistance and processability. The graft copolymer prepared by the method. Background technique [0004] Diene-based grafts prepared by graft-polymerizing monomers such as (meth)acrylate-based monomers, aromatic vinyl-based monomers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/04C08F212/10C08F220/44C08F2/01C08F2/38
CPCC08F279/04C08F2/01C08F2/38C08F212/10C08F220/44C08L25/12C08L55/02C08F212/08
Inventor 全泰永蔡周秉郑有城金钟汎金仁晳
Owner LG CHEM LTD
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