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Graft copolymer, preparation method therefor, thermoplastic resin composition containing same, and molded product

A graft copolymer and graft polymerization technology, applied in the field of graft copolymers, can solve the problems of reduced productivity, thermal stability degradation, increased load, etc., and achieve the effect of high yield and excellent physical properties

Active Publication Date: 2018-11-09
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the thermal stability of the copolymer deteriorates due to the emulsifier remaining in the latex after the completion of polymerization, and discoloration occurs during thermoforming at high temperature or during long-term storage
[0008] In addition, since an excess of water is used to remove impurities such as emulsifiers remaining in the copolymer latex prepared by emulsion polymerization, the load increases during dehydration or drying, resulting in decreased productivity

Method used

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  • Graft copolymer, preparation method therefor, thermoplastic resin composition containing same, and molded product
  • Graft copolymer, preparation method therefor, thermoplastic resin composition containing same, and molded product
  • Graft copolymer, preparation method therefor, thermoplastic resin composition containing same, and molded product

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preparation example Construction

[0051] According to the preparation method of the graft copolymer of the present invention, a conjugated diene rubber latex is used as a seed. The conjugated diene rubber latex can be obtained by emulsion polymerization of the above-mentioned conjugated diene compound.

[0052] In the present invention, when graft polymerization is performed, the reactant may further contain a molecular weight regulator or a redox initiator, and preferably both.

[0053] For example, the content of the molecular weight modifier is preferably 0.1 to 1 part by weight or 0.3 to 0.7 parts by weight. Within this range, the amount of impurities remaining in the final graft copolymer latex is reduced, and as a result, a copolymer having a desired weight average molecular weight can be prepared without impairing thermal stability and transparency.

[0054] In the field to which the present invention pertains, compounds generally used to control the molecular weight of polymers are not particularly li...

Embodiment 1

[0089] Embodiment 1: the preparation of graft copolymer

[0090] 100 parts by weight of deionized water, 0.2 parts by weight of dipotassium alkenyl (C16-18) succinate and 0.3 parts by weight of potassium salt of sorbic acid were added as emulsifiers to 50 parts by weight (based on solids) of the average grain Diameter is of large diameter conjugated diene rubber latex seeds. Then, 35 parts by weight of methyl methacrylate, 12 parts by weight of styrene, 3 parts by weight of acrylonitrile, 0.5 parts by weight of tertiary dodecyl mercaptan, 0.048 parts by weight of The sodium formaldehyde sulfoxylate, the sodium edetate of 0.012 parts by weight, the ferrous sulfide of 0.001 parts by weight and the cumene hydroperoxide of 0.04 parts by weight, and react. Then, the temperature was raised to 80° C., the reaction product was aged for 1 hour, and the reaction was terminated. In this case, the polymerization conversion rate was 98.8%, and the amount of cured product was 0.24% by ...

Embodiment 2

[0092] An experiment was performed in the same manner as in Example 1 except that 0.25 parts by weight of dipotassium alkenyl (C16-18) succinate and 0.25 parts by weight of potassium sorbic acid were added as emulsifiers.

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Abstract

The present invention relates to a graft copolymer having improved thermal stability, a preparation method therefor, a thermoplastic resin composition containing the same, and a molded product and, more specifically, to a graft copolymer having a core-shell structure, the graft copolymer being polymerized by comprising a specific amount of metal sorbate, which can be readily removed in a dehydration process, as an emulsifier so as to alleviate the problem of thermal stability deterioration caused by residual emulsifiers during the preparation of an emulsion-polymerized graft copolymer. According to the present invention, by reducing the amount of residual emulsifiers, the thermal stability of a graft copolymer is improved, and a thermoplastic resin composition and a molded product, which comprise the same, have excellent impact strength, flowability, and the like and also have effects of improved physical properties such as transparency, a degree of discoloration during injection duration and a degree of discoloration during high-temperature long-term storage.

Description

technical field [0001] [Cross Reference to Related Application] [0002] This application claims priority to Korean Patent Application No. 10-2017-0010785 filed in the Korean Intellectual Property Office on Jan. 24, 2017, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a graft copolymer having excellent thermal stability, a method for producing the graft copolymer, a thermoplastic resin composition comprising the graft copolymer, and a molded article comprising the thermoplastic resin composition. More specifically, the present invention provides a graft copolymer having excellent thermal stability and a method for preparing the graft copolymer, wherein a metal salt of sorbic acid is added in a specific amount during polymerization to increase the prepared Thermal stability of graft copolymers. Furthermore, the present invention provides a thermoplastic resin composition having excellent physical properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02C08L55/02C08K5/098C08F2/24C08F2/38C08F2/44
CPCC08L25/12C08L33/12C08F2/26C08F279/02C08L2207/53C08F220/14C08F212/10C08F220/44C08L55/02C08L51/04C08K5/098C08F2/24C08F2/38C08F2/44C08F2500/12C08F2500/21C08F222/34C08F212/04C08F2800/20C08F2500/24
Inventor 张石球崔正洙李元锡李如达朴相厚玉惠正金豪焄沈炯燮俞根勋
Owner LG CHEM LTD