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Copolymer preparation method, copolymer prepared thereby, and thermoplastic resin composition comprising same

A technology of copolymer and polymerization initiator, applied in the field of copolymer preparation, can solve the problems of deterioration of physical properties of copolymer, poor thermal stability, increase in yellowness, etc., achieve uniform distribution of thermal stability, excellent thermal stability, prevent effect of gas

Active Publication Date: 2021-11-30
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a limitation may arise in that a polymer having a non-uniform composition is produced, for example, only vinyl cyano-based monomers are continuously bonded to the terminal of the polymer chain, so that the physical properties of the copolymer deteriorate and the yellowness increases
[0009] Therefore, when a heat-resistant styrenic copolymer is prepared by the suspension polymerization method, in order to compensate for the disadvantages of the suspension polymerization method as described above, it has been proposed to separately add a heat-resistant monomer such as α -Methylstyrene monomer approach, thus reducing the heterogeneity of the monomer units in the copolymer, but still having poor thermal stability at extrusion processing temperatures

Method used

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  • Copolymer preparation method, copolymer prepared thereby, and thermoplastic resin composition comprising same
  • Copolymer preparation method, copolymer prepared thereby, and thermoplastic resin composition comprising same

Examples

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preparation example Construction

[0036] The present invention provides a method for preparing a copolymer in which the heterogeneity of monomer units in the copolymer is reduced and has excellent thermal stability.

[0037] The production method of the copolymer according to the present invention may be a production method of a styrenic copolymer, and as a specific example, may be a production method of a heat-resistant styrenic copolymer.

[0038] The preparation method of the copolymer according to the present invention is characterized in that it includes the step of adding an alkyl-substituted aromatic vinyl-based monomer and a vinyl cyano-based monomer to polymerize in the presence of a polymerization initiator (S10), wherein In the step (S10), the vinyl cyano monomer is added at one time before the polymerization is initiated, and the monomer droplets are continuously and separately added during the polymerization in the step (S10), and the monomer droplets contain part or all of the Alkyl substituted a...

Embodiment 1

[0093]

[0094] In a mixing device equipped with a stirrer, add 22.8 parts by weight of ion-exchanged water, 20 parts by weight of α-methylstyrene, 0.26 parts by weight of tricalcium phosphate and 0.001 parts by weight of polyoxyethylene alkyl ether phosphate and stirring to prepare a monomer dispersion for addition of monomer droplets.

[0095]

[0096] Into the reactor, 91.2 parts by weight of ion-exchanged water, 48 parts by weight of α-methylstyrene, 32 parts by weight of acrylonitrile, 0.5 parts by weight of 1,1-bis(tert- Butyl peroxide) cyclohexane, 0.1 parts by weight of t-butyl peroxybenzoate as the second polymerization initiator, 0.004 parts by weight of polyoxyethylene alkyl ether phosphate, and 1.04 parts by weight of tricalcium phosphate, And polymerization was initiated at 100°C. Upon initiation of polymerization, monomer droplets from a prepared monomer dispersion containing 20 parts by weight of α-methylstyrene were continuously added for 8 hours while mai...

Embodiment 2

[0099] Except in Example 1, during the preparation of the copolymer, when the polymerization was initiated, monomer droplets from the prepared monomer dispersion containing 20 parts by weight of α-methylstyrene were continuously added for 6 hours, while A rate of 3.33 parts by weight / hour (based on α-methylstyrene monomer) was maintained, and after completion of the addition of monomer droplets (polymerization conversion 70%), the polymerization was allowed to proceed for an additional 6 hours, in accordance with the implementation Example 2 was carried out in the same manner as Example 1.

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Abstract

The present invention relates to a copolymer preparation method, the copolymer preparation method comprising a step (S10) of polymerizing by inputting aromatic vinyl monomers, which are substituted with the alkyl group, and vinyl cyan-based monomers in the presence of a polymerization initiator, wherein the vinyl cyan-based monomers are input all at once before the initiation of the polymerization in said step (S10), and monomer droplets are continuously input in a divided manner during the polymerization in said step (S10). The monomer droplets comprise some or all of the aromatic vinyl monomers substituted with the alkyl group. The invention also relates to a copolymer prepared thereby, and a thermoplastic resin composition comprising the same.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of priority from Korean Patent Application No. 10-2019-0150369 filed on November 21, 2019, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a method for preparing a copolymer, more particularly, to a method for preparing a copolymer using an aromatic vinyl monomer and a vinyl cyano monomer, a copolymer prepared therefrom, and a compound comprising the copolymer Thermoplastic resin composition. Background technique [0004] In general, styrenic copolymers are widely used in various industrial fields, including office automation equipment such as computers, printers and copiers, home appliances such as televisions and audio equipment, due to their excellent moldability, rigidity and electrical characteristics. , electrical and electronic components, auto parts, and a wide variety of other commodit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/12C08F220/44C08L25/16
CPCC08F212/12C08L25/16C08F220/44C08F2/30C08F4/38C08F2/001C08F2/44C08L25/12
Inventor 朱玟徹申珉承洪晟元金仁秀李亨燮
Owner LG CHEM LTD