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Polystyrene resin composition and light guide plate obtained by molding the resin composition

一种苯乙烯系树脂、组合物的技术，应用在导光板领域，能够解决光线透射率差、尚未完成聚苯乙烯系树脂光学特性、光线透射率低等问题，达到吸水性低的效果

Active Publication Date: 2017-04-12
PS JAPAN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it is an excellent polystyrene resin from the viewpoint of water absorption, its light transmittance is slightly inferior to that of acrylic resin
In particular, the light transmittance of short-wavelength (~500nm) is lower than that of acrylic resin, so when the light transmission distance becomes longer, the light transmitted through polystyrene resin may be slightly yellowish, so it may affect the color tone in color liquid crystal display The problem
Therefore, as a raw material of a light guide plate, a combination of an acrylic resin and a polystyrene resin has been proposed (refer to the following patent documents 1 and 2), but there is almost no proposal to use a polystyrene resin alone, and it has not been completed so far. Research on Improving the Optical Properties of Polystyrene Resins

Method used

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  • Polystyrene resin composition and light guide plate obtained by molding the resin composition
  • Polystyrene resin composition and light guide plate obtained by molding the resin composition
  • Polystyrene resin composition and light guide plate obtained by molding the resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125]

[0126] 0.05 parts by mass of 1,1-bis(tert-butylperoxy)cyclohexane was added to 100 parts by mass of a mixed solution of 85 mass % of styrene (TBC concentration 11 μg / g) and 15 mass % of ethylbenzene. The polymerization solution was continuously charged into a 5.4-liter complete mixing reactor at a rate of 0.70 liter / hour, and the temperature was adjusted to 101°C. Next, the obtained solution was continuously charged into a 3.0-liter laminar flow reactor equipped with a stirrer and capable of temperature control in three zones. The temperature of the laminar flow reactor was adjusted to 113°C / 121°C / 128°C. A polymer solution was obtained in the above-mentioned manner.

[0127] The obtained polymer solution is continuously supplied to a devolatilization extruder with 2 stages of venting holes, and the temperature of the extruder is 225° C., and the vacuum degree of the 1st stage venting hole and the 2nd stage venting hole is 15 torr. The condition reclaims unreacted ...

Embodiment 2

[0130] Phosphorous antioxidant (tris(2,4-di-tert-butylphenyl) phosphite, trade name: Adecastab 2112) was added at a concentration of 0.10 parts by mass relative to 100 parts by mass of the polymer, and in addition, it was mixed with The same method as in Example 1 was used to obtain a polystyrene resin composition.

Embodiment 3

[0132] Added 0.01 part by mass of 1,1-bis(tert-butylperoxy)cyclohexane to 100 parts by mass of a mixed solution of 89 mass % of styrene (TBC concentration 11 μg / g) and 11 mass % of ethylbenzene The polymerization solution was continuously charged into a 5.4-liter complete mixing reactor at a rate of 0.70 liter / hour, and the temperature was adjusted to 117°C. Next, the obtained solution was continuously charged into a 3.0-liter laminar flow reactor equipped with a stirrer and capable of temperature control in three zones. The temperature of the laminar flow reactor was adjusted to 128°C / 135°C / 141°C. A polymer solution was obtained in the above-mentioned manner.

[0133] The obtained polymer solution is continuously supplied to a devolatilization extruder with 2 stages of venting holes, and the temperature of the extruder is 225° C., and the vacuum degree of the 1st stage venting hole and the 2nd stage venting hole is 15 torr. The conditions reclaim unreacted monomer and solve...

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Abstract

The present invention provides a polystyrene-based resin composition suitable for producing a shaped light guide plate with low water absorption, excellent suppression of warpage or dimensional change of molded products, excellent optical properties, and excellent mold release properties, and the polystyrene-based resin composition. A light guide plate obtained by molding a vinyl resin composition. The polystyrene resin composition of the present invention contains 100 parts by mass of a styrene resin and 0.02 to 0.2 parts by mass of a phosphorus antioxidant, wherein, per 1 g of the styrene resin, 4-tert-butylcatechol The content is 1 ~ 6μg.

Description

technical field [0001] The present invention relates to a polystyrene resin composition and a light guide plate obtained by molding the resin composition. More specifically, the present invention relates to a styrene-based resin composition for forming a light guide plate constituting a backlight unit of a liquid crystal display device including a light source such as an LED. Background technique [0002] The backlight of a liquid crystal display device includes a direct type in which a light source is arranged on the front of the display device, and an edge-light type in which a light source is arranged on the side of the display device. The light guide plate is used for an edge-lit backlight, and has a function of guiding light from a light source arranged on the side to the front. Edge-lit backlights are mostly used in TVs, personal computer monitors (such as desktop computers, notebook computers, etc.), navigation system monitors, mobile phones, PDAs, etc., and are basi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/04C08K5/13C08K5/524G02B6/00G02F1/13357
CPCC08K5/05C08K5/09C08K5/13C08K5/526C08K5/527C08L25/06G02B1/045G02B6/0065C08L25/04C08K5/01C08K5/49G02B6/00C08K5/00
Inventor 远山满俊铃木纯山城康平矢崎淳
Owner PS JAPAN CORP