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Thermoplastic resin composition

A technology of thermoplastic resin and composition, applied in lighting and heating equipment, transportation and packaging, optical signals, etc., can solve the problems of low thickness, reduced production efficiency, increased surface diffuse reflectance of deposited aluminum, etc., and achieve excellent basic performance , the effect of excellent processing performance

Active Publication Date: 2021-10-26
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, when the melt flow index is low, the injection conditions are limited, and therefore, the design is also limited, and it is not possible to injection mold a case with a low thickness
In order to solve the above-mentioned problems, a diene-based rubber thermoplastic resin composition having a high melt flow index has been developed, but it has a problem of generating many thermal weld lines
When many thermal fusion lines are produced, these lines are visible on the bonding surface of the tail lamp housing, so the appearance quality will be reduced
In addition, additional processing for removing the wire is required, and therefore, production efficiency will decrease
In addition, the diffuse reflectance of the surface on which the aluminum is deposited increases slightly

Method used

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  • Thermoplastic resin composition
  • Thermoplastic resin composition
  • Thermoplastic resin composition

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0073]The thermoplastic resin compositions of Examples and Comparative Examples were extruded to prepare pellets, and the pellets were evaluated by the method described below, and the results are shown in Table 1 and Table 2 below.

[0074] (1) Melt flow index (g / 10 min): Measured under the conditions of 220° C. and 10 kg according to ASTM D1238.

experiment example 2

[0076] The thermoplastic resin compositions of Examples and Comparative Examples were extruded and injection molded to prepare test pieces, and the test pieces were evaluated by the methods described below, the results of which are shown in Table 1 and Table 2 below.

[0077] (2) Heat distortion temperature (HDT, °C): Measured according to ASTM D648 without annealing.

[0078] (3) Vicat softening temperature (VST, °C): Measured according to ASTM D1525 without annealing.

[0079] (4) Izod impact strength (kg·cm / cm, 1 / 4 inch): Measured according to ASTM D256.

[0080] (5) Tensile strength (kg / cm 2 ) and tensile elongation (%): measured according to ASTM D638.

[0081] (6) Flexural strength (kg / cm 2 ): measured according to ASTM D790.

experiment example 3

[0083] The thermoplastic resin compositions of Examples and Comparative Examples were extruded and injection molded to prepare test specimens with a size of 10 cm×10 cm, and were deposited on the test specimens using a vacuum deposition device (commercially available from Daehan Vacuum Eng, Co. Aluminum (Al) was vacuum deposited on the surface. The properties of the samples including the Al film formed thereon were measured by the method described below, and the results are shown in Table 1 and Table 2.

[0084] (7) Total reflectance and diffuse reflectance (%): Diffuse reflectance and specular reflectance were measured using a surface gloss meter (reflectometer (TR-1100AD) commercially available from Tokyo Denshoku Co., Ltd.). Total reflectance is the sum of diffuse and specular reflectance. In this case, since the diffuse reflectance is largely influenced by sensitivity according to gas and surface properties, the state of the vacuum-deposited surface can be inferred from t...

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Abstract

The present invention relates to a thermoplastic resin composition comprising: a diene-based rubber graft polymer; an alkyl-unsubstituted styrene-based polymer; an alkyl-substituted styrene-based polymer including an alkyl-substituted styrene-based monomer unit, an alkyl-unsubstituted styrene-based monomer unit, and a vinyl cyanide-based monomer unit; and a maleimide-based polymer having a weight-average-molecular weight of 110,000 to 127,000 g / mol.

Description

technical field [0001] [Cross Reference to Related Application] [0002] This application claims priority and benefit from Korean Patent Application No. 10-2019-0139639 filed on November 04, 2019, the disclosure of which is incorporated herein by reference in its entirety. [technical field] [0003] The present invention relates to a thermoplastic resin composition, in particular to a thermoplastic resin composition comprising an alkyl-substituted styrenic polymer comprising an alkyl-substituted styrenic polymer Styrenic monomer units, unsubstituted styrenic monomer units and vinyl cyanide monomer units. Background technique [0004] The diene rubber graft polymer is a graft polymer formed by graft polymerization of a diene rubber polymer, an aromatic vinyl monomer and a vinyl cyanide monomer. Compared with conventional high-impact polystyrene, diene-based rubber-grafted polymers have excellent impact resistance, chemical resistance, thermal stability, coloring propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/16C08L25/12C08L55/02C08L35/06
CPCC08L25/16C08L25/12C08L2201/08C08L55/02C08L35/06C08L2205/025C08L2205/03C08L2205/035C08L51/04C08L25/06C08L2203/30
Inventor 南宫浩金度亨金成龙郑大山
Owner LG CHEM LTD