Styrene-based resin composition for optical applications, molded product, and light guide plate

A styrene-based resin and styrene-based technology, applied in optics, optical components, instruments, etc., can solve the problems of chromaticity change, backlight brightness decrease, molded product yellowing, etc., and achieve small changes in hue and transmittance , High coloring prevention effect, excellent colorless and transparent effect

Inactive Publication Date: 2019-11-05
TOYO STIRENE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent Document 1 discloses a light guide plate having a weight average molecular weight (Mw) of 60,000 to 170,000 to 170,000 styrene-(meth)acrylate polymer resin, a residual monomer amount of 3,000 ppm or less, and an oligomer amount of 2% or less. Its water absorption is high, and its dimensional stability is not as good as that of styrene-based resins made of styrene-based monomers.
[0006] On the other hand, although styrene-based resins made of styrene-based monomers have low water absorption, they will discolor due to heat during long-term use, and the molded products will turn yellow, resulting in a decrease in transmittance.
As a result, the brightness of the backlight decreases and the chromaticity may change

Method used

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  • Styrene-based resin composition for optical applications, molded product, and light guide plate
  • Styrene-based resin composition for optical applications, molded product, and light guide plate
  • Styrene-based resin composition for optical applications, molded product, and light guide plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～1-30

[0111] (Examples 1-1 to 1-30, Comparative Examples 1-1 to 1-10)

[0112] With the contents shown in Table 2, using a single-screw extruder with a screw diameter of 40 mm, styrene-based resins PS-1, PS-2, PS-3 and B and C as additives were added at a barrel temperature of 230 ° C, Melting and kneading was carried out at a screw speed of 100 rpm to obtain granules. Additives B and C used in Table 2 are as follows. Here, additive B represents (b) phosphorus antioxidant, and additive C represents (c) hindered phenolic antioxidant.

[0113] B-1: Tris(2,4-di-tert-butylphenyl) phosphite (Irgafos 168 manufactured by BASF Japan Co., Ltd.)

[0114] B-2: 2,2'-methylenebis(4,6-di-tert-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus (ADKSTAB HP-10 manufactured by ADEKA Corporation)

[0115] B-3: Bis(2,4-dicumylphenyl)pentaerythritol diphosphite (Doverphos S-9228 manufactured by Dover Chemical Corporation)

[0116] B-4: 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diph...

Embodiment 2-1～2-26

[0144] The first reactor and the second reactor as a complete mixing type stirred tank and the third reactor as a plug flow type reactor with a static mixer are connected in series to constitute a polymerization process, as shown in Table 1. Production of the styrene-based resin was carried out under Condition 1 shown. The capacity of each reactor was 39 liters for the first reactor, 39 liters for the second reactor, and 16 liters for the third reactor. A raw material solution was prepared using the raw material composition described in Condition 1 of Table 1, and the raw material solution was continuously supplied to the first reactor at the flow rate described in Table 1.

[0145] Moreover, at the inlet of the 3rd reactor, the hydrophilic additive D which has a polyether chain was added so that it may become the kind and content shown in Table 3. The kinds of additives and polyethylene glycols used are as follows.

[0146] D-1: Polyethylene glycol with an average molecular...

Embodiment 3-1～3-18

[0185] Next, using a single-screw extruder with a screw diameter of 40 mm, the styrene-based resin A, B and C as additives were melted and kneaded at a cylinder temperature of 230° C. and a screw speed of 100 rpm to obtain the content shown in Table 5. particles. The symbols of B and C of the additives used in Table 5 are the same as those in Test 1.

[0186] The transmittance, YI value, and whitening suppression effect were measured and evaluated by the method similar to Test 2.

[0187] Table 5 shows the characteristics and evaluation results of each resin composition.

[0188] 【Table 4】

[0189]

[0190] *1 Concentration relative to the mass standard of styrene + methyl methacrylate

[0191] 【table 5】

[0192]

[0193] The molded articles of Examples 3-1 to 3-16, which contain a relatively large amount of (meth)acrylate units, have an excellent whitening suppression effect, excellent initial transmittance and YI value, and are stored at 80°C for 1000 hours The fi...

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Abstract

The present invention provides a styrene-based resin composition for optical applications, which is characterized in being a styrene-based resin composition formed from (a) a styrene-based resin having a weight-average molecular weight of 150,000 to 700,000, (b) a phosphorus-based antioxidant having a specific structure, and (c) a hindered phenol-based antioxidant having a specific structure, wherein in terms of 100 mass% of styrene-based resin composition, the content of (b) is 0.03 to 0.40 mass% and the content of (c) is 0.02 to 0.30 mass%.

Description

[0001] This application is a divisional application based on the invention patent application with application number 201280061422.9 and the title of the invention is "Styrenic resin composition for optics, molded product and light guide plate". The above patent application for invention is a Chinese national phase application of the PCT international application with the application number PCT / JP2012 / 082946, and the filing date is December 19, 2012. technical field [0002] The present invention relates to a styrene-based resin composition having excellent hue and transparency, and long-term thermal stability, a molded article, and a light guide plate. Background technique [0003] As a backlight for a liquid crystal display, there are a direct type backlight in which a light source is arranged on the front of a display device, and a light edge type backlight in which a light source is arranged on a side surface. The light guide plate is assembled on the edge-lit backlight,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L25/08C08L25/14C08L33/12C08K5/134C08K5/1575C08K5/526C08K5/527G02B1/04
CPCC08K5/1345C08K5/1575C08K5/526C08K5/527C08L25/06C08K5/005C08L25/04C08L2201/08C08L2666/78G02B1/045
Inventor 西野广平藤松秀隆塚田雅史佐藤诚
Owner TOYO STIRENE CO LTD
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