Styrenic resin composition for optics

A styrenic resin, styrenic technology, applied in optics, optical components, nonlinear optics, etc., can solve the problems of reduced transmittance and reduced display brightness, and achieve low water absorption, cheap water absorption, colorless and transparent Excellent effect

Active Publication Date: 2017-04-26
TOYO STIRENE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If the molded product becomes cloudy, in the case of a long optical path such as a light guide plate, there is a problem that the transmittance will be greatly reduced due to light scattering, and the brightness of the display will decrease.

Method used

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  • Styrenic resin composition for optics
  • Styrenic resin composition for optics
  • Styrenic resin composition for optics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～1-33、 comparative example 1-1～1-9

[0112] With the contents shown in Table 2, using a single-screw extruder with a screw diameter of 40mm, melt and knead styrene resins A-1 to A-3 and additives at a cylinder temperature of 230°C and a screw speed of 100rpm to obtain particles. The additives used in Table 2 are as follows.

[0113] B-1: Vinyl lauryl polyoxyethylene ether ethylene oxide average added mole number = 25 (EMULGEN123P manufactured by Kao Corporation)

[0114] B-2: Vinyl octadecyl polyoxyethylene ether average addition mole number of ethylene oxide = 12 (EMULGEN320P manufactured by Kao Corporation)

[0115] B-3: Vinyl lauryl polyoxyethylene ether average addition mole number of ethylene oxide = 9 (EMULGEN109P manufactured by Kao Corporation)

[0116] B-4: Average added mole number of vinyl cetyl polyoxyethylene oxide ethylene oxide = 7 (EMULGEN210P manufactured by Kao Corporation)

[0117] B-5: Vinyl lauryl polyoxyethylene ether ethylene oxide average addition mole number = 30 (EMULGEN130K manufactu...

Embodiment 2-1～2-46

[0167] 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 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 1, and the raw material solution was continuously supplied to the first reactor at the flow rate described in Table 1.

[0168] Moreover, at the inlet of the 3rd reactor, the hydrophilic additive 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.

[0169] B-1: Polyethylene glycol with an average molecular weight of 4...

Embodiment 3-1～3-36

[0210] Evaluation was performed in the same manner as in Test 2, except that Compound X was not added in Test 3. In Examples 3-1 to 3-32, the styrene-based resin A-1 prepared according to the condition 1 was used, and the styrene-based resin A-2 prepared according to the condition 2 was used in Examples 3-33 to 3-34 , In Examples 3-35 to 3-36, the styrene-based resin A-3 produced under Condition 3 was used.

[0211] The results are shown in Table 4.

[0212] 【Table 4】

[0213]

[0214] Referring to Table 4, it can be seen that the whitening suppression effect of all Examples is excellent. In addition, comparing Examples 3-1 to 3-24 with Examples 3-25 to 3-32, it can be seen that when the content of phosphorus-based D is 0.05-0.40% by mass and the content of phenol-based E is 0.02-0.30% by mass, the long-term Thermal stability is particularly excellent. In addition, referring to Examples 3-33 to 3-36, it was found that the same results can be obtained also when the styre...

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Abstract

The present invention provides a transparent styrenic resin composition that suppresses the problem of cloudiness of molded products (whitening phenomenon) caused by environmental changes such as temperature, humidity, and warm water immersion, which is a disadvantage of styrenic resins. The styrene-based resin composition for optics of the present invention contains a styrene-based resin with a weight average molecular weight of 150,000 to 700,000 and a hydrophilic additive, and the styrene-based resin composition is characterized in that the hydrophilic additive At least one selected from polyoxyethylene-type surfactants with an average added mole number of ethylene oxide of 3 to 150 and polyethylene glycol with an average molecular weight of 200 to 10,000, with an HLB value of 5 to 20 and the above-mentioned Content in 100 mass % of styrene-type resin compositions is 0.4-2.0 mass %.

Description

technical field [0001] The present invention relates to a transparent styrenic resin composition capable of suppressing whitening caused by environmental changes. Background technique [0002] Styrene-based resins have excellent properties such as transparency, rigidity, low water absorption, and dimensional stability, and are excellent in molding processability. Therefore, various molding methods such as injection molding, extrusion molding, and blow molding, It can be widely used as electrical appliances and various industrial materials, food packaging containers, groceries, etc. Moreover, it can also be used for optical components, such as a light guide plate, as a use which exhibits transparency. [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 assembl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/14C08K5/13C08K5/49C08L71/02F21V8/00G02F1/13357
CPCC08K5/1345C08K5/1575C08K5/526C08K5/527C08L25/08C08L25/14C08L33/12C08L2201/08C08L2201/10G02B6/0013G02B6/0065C08L71/02C08K5/13C08K5/49C08K5/053
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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