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Copolymer and preparation method therefor

一种共聚物、混合物的技术，应用在共聚物及其制备领域，能够解决共聚物分子量降低、共聚物颜色改变、缺陷比例增加等问题，达到优异加工性能、优异耐擦伤性、重均分子量高的效果

Active Publication Date: 2019-06-14
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there occurs a defect that the productivity decreases or the color of the copolymer changes
In addition, if an excessive amount of initiator is used, the molecular weight of the copolymer decreases, and the proportion of defects in the final heat-resistant resin product increases during extrusion molding

Method used

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  • Copolymer and preparation method therefor
  • Copolymer and preparation method therefor
  • Copolymer and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0069] The preparation method of the copolymer according to one embodiment of the present invention comprises: carrying out the continuous mass polymerization of monomer mixture in more than four reactors; The polymer obtained by the reaction is volatilized to separate the polymer, wherein, based on the total weight of the monomer mixture, the monomer mixture comprises 20% by weight to 65% by weight of an alkyl styrene monomer, 10% by weight to 40% by weight of (meth)acrylate monomers and 20% to 40% by weight of aromatic vinyl monomers, wherein the temperature of the devolatilization bath is 223°C to 252°C, and the pressure is 20 Hold the following.

[0070] Here, the monomer mixture may further include 0.5% to 10% by weight of a maleimide-based monomer based on the total weight of the monomer mixture.

[0071] The description about the constituent elements and the composition of the monomer mixture is the same as the description referring to the above-mentioned copolymer.

...

Embodiment 1 to Embodiment 13 and comparative example 1 to comparative example 13

[0093] Add 95 parts by weight of a monomer mixture containing the monomers described in Table 1 below, 5 parts by weight of toluene as a reaction solvent, and 0.1 parts by weight of 1,1-bis(tert-butoxy)cyclo as an initiator Hexane was used to prepare the polymerization solution. The polymerization solution was fed into the first polymerization reactor of 26 L at a rate of 7 kg / hour for the first bulk polymerization at 110° C., and then fed into the second polymerization reactor of 16 L for the second bulk polymerization at 110° C. Polymerization, then fed into the third polymerization reactor of 16L to carry out the third bulk polymerization at 110°C, and then fed into the fourth polymerization reactor of 16L to carry out the fourth bulk polymerization at 110°C, thus completing the continuous bulk polymerization. After that, unreacted monomer and reaction solvent were recovered and removed from the devolatilization bath at the temperature and pressure described in Table 1 to ...

experiment example 1

[0105] The physical properties of the copolymers of Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 2 below.

[0106] 1) Residual monomer (ppm): The copolymer was dissolved in a chloroform solution and deposited in methanol, and the supernatant was used to measure by gel permeation chromatography.

[0107] 2) Polymerization conversion rate (%)=(the gross weight of the monomer mixture that adds initially-the gross weight of unreacted monomer mixture) / (the gross weight of the monomer mixture that adds initially) * 100

[0108] 3) Weight average molecular weight (g / mol): Measured as a relative value to a standard polystyrene (PS) sample by GPC (water breeze) using THF as an eluent.

[0109] 4) Pencil hardness: A pencil with a load of 0.5 kg was fixed at an angle of 45°, the surface of the extruded sample was scratched by hardness using the pencil, and the surface was checked with the naked eye for scratches, thereby mea...

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Abstract

The present invention relates to a copolymer including 20 to 65 wt% of units derived from an alkyl styrene-based monomer; 10 to 40 wt% of units derived from a (meth)acrylate-based monomer; and 20 to 40 wt% of units derived from an aromatic vinyl-based monomer, based on the total weight of the copolymer, wherein the residual monomer content is 780 ppm or less, and a method for preparing the same.

Description

technical field [0001] [Cross Reference to Related Application] [0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2017-0096332 filed on July 28, 2017 and Korean Patent Application No. 10-2018-0086811 filed on July 25, 2018, both of which The entire content of the application is incorporated into this specification by reference. [technical field] [0003] The present invention relates to a copolymer comprising a unit derived from an alkylstyrene monomer, a unit derived from a (meth)acrylate monomer, and a method for preparing the same, and to a copolymer and a method for preparing the same. units and units derived from vinyl cyano monomers, and the residual monomer content is 780ppm or less. Background technique [0004] In general, styrenic copolymers have excellent moldability, stiffness, and electrical properties, and are widely used in packaging including OA products such as computers, printers, and copiers, home applia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F222/40C08F220/18C08F220/44C08F2/02C08F6/00
CPCC08F2/02C08F220/44C08F6/005C08F212/12C08F220/14C08L25/16C08L33/12C08F222/40C08F2/001C08F212/08C08F6/001C08F220/1802C08F220/1803C08F6/10C08F6/28C08F220/18
Inventor 徐在范李大雨朴晶台金圭善张志旭
Owner LG CHEM LTD
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