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Styrenic resin composition for optics, molded article, and light guide plate

A styrene-based resin and styrene-based technology, applied in the field of styrene-based resin compositions, can solve problems such as chromaticity changes, backlight brightness reduction, and yellowing of molded products, achieving small changes in hue and transmittance, High coloring prevention effect, excellent colorless transparency effect

Active Publication Date: 2017-03-22
TOYO STIRENE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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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  • Styrenic resin composition for optics, molded article, and light guide plate
  • Styrenic resin composition for optics, molded article, and light guide plate
  • Styrenic resin composition for optics, molded article, and light guide plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～1-25

[0118] (Examples 1-1 to 1-25, Comparative Examples 1-1 to 1-8, Reference Examples 1-1 to 1-9)

[0119] With the content shown in Table 2, using a screw diameter of 40mm single-screw extruder, styrenic resins PS-1, PS-2, PS-3 and B, C, and D as additives at the barrel temperature Melt kneading at 230° C. and a screw rotation speed of 100 rpm to obtain granules. The additives used in Table 2 are as follows. Here, additive B represents (b) 6-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyl Benzo[d,f][1,3,2]dioxaphosphopane, additive C means (c) phosphorus antioxidant, additive D means (d) hindered phenolic antioxidant.

[0120] B: 6-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butylbenzo[d,f] [1,3,2] Dioxaphosphopane (SUMILIZER GP manufactured by Sumitomo Chemical Co., Ltd.)

[0121] C-1: Tris(2,4-di-tert-butylphenyl)phosphite (Irgafos168 manufactured by BASF Japan Co., Ltd.)

[0122] C-2: 2,2'-methylenebis(4,6-di-tert-bu...

Embodiment 2-1～2-34

[0150] 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.

[0151] Moreover, at the inlet of the 3rd reactor, the hydrophilic additive E which has a polyether chain was added so that it might become the kind and content shown in Table 3. The kinds of additives and polyethylene glycols used are as follows.

[0152] E-1: Polyethylene glycol with an average molecul...

Embodiment 3-1～3-10

[0175] 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 4. Production of the styrene-based resin was carried out under the conditions 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 Table 4, and the raw material solution was continuously supplied to the first reactor at the flow rate described in Table 4. At the inlet of the first reactor, a polymerization initiator was added to the raw material solution so as to have the addition concentration (mass basis relative to the total amount of raw material styrene and methacrylic acid) described in Table 4, and uniformly mixed. The polymerization initiator that table 4 recor...

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Abstract

The present invention addresses the problem of providing a styrene-based optical resin composition, a molded product, and a light guide plate that have excellent colorless transparency and long-term thermal stability, and that exhibit little change in hue and transmittance. The present invention provides a styrene-based optical resin composition that comprises (a) a styrene-based resin having a weight-average molecular weight of 150,000-700,000, (b) 6-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10- tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin, and (c) a phosphorus-based antioxidant, and / or (d) a hindered phenolic antioxidant, and is characterized in that 100 mass% of the styrene-based resin composition includes 0.02-0.40 mass% of (b), 0.02-0.50 mass% of (c), and 0.02-0.50 mass% of (d).

Description

technical field [0001] The present invention relates to a styrenic resin composition having excellent hue and transparency, and long-term thermal stability, a molded article, and a light guide plate. Background technique [0002] 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, and guides the light from the side to the LCD panel to play a role. It can be used in a wide range of applications such as TVs, desktop PC monitors, notebook PCs, mobile phones, and car navigation. use. In addition, the backlight with the light guide plate can also be used for lighting. The light guide plate has been using acrylic resin represented by PMMA (polymethyl methacrylate), but it has high water absorption, so there is a problem that the molded pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/04C08K5/13C08K5/52
CPCC08K5/13C08K5/51C08K2201/014
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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