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Novel methacrylic resin extrusion plate and manufacturing method thereof

A technology of methacrylic acid and extruded boards, which can be applied to flat products, other household appliances, instruments, etc., and can solve the problems of large board thickness changes, poor brightness uniformity, and lack of high brightness

Inactive Publication Date: 2007-09-12
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the usual extruded sheet, the thickness variation in the extrusion direction is small, but the thickness variation in the width direction is large, and the incident light emitted from the light source lamp installed on the light source device is emitted irregularly, and the brightness uniformity is deteriorated. Therefore, high brightness cannot be obtained

Method used

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  • Novel methacrylic resin extrusion plate and manufacturing method thereof
  • Novel methacrylic resin extrusion plate and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0082] Using a 150mmφ single-screw extruder (barrel temperature: 200°C-210°C-210°C-260°C-260°C-240°C from the supply side) with a T-die for plates (die temperature: 250°C), 3 polishing rolls (roller temperature: 80 ℃) that are adjusted temperature, and the extruded plate forming machine that traction device is formed, with the mixture of the polymer-A of 50 weight parts and the polymer-C of 50 weight parts (table The apparent density is 0.88g / ml) and extruded with an extrusion rate of 600Kg / hr to obtain a methacrylic resin extruded sheet (extruded sheet-A) with a width of 1000mm and a thickness of 6mm. The thickness measurement points shown in Figure 1 were measured, and the plate thickness accuracy was calculated, and the results are shown in Table 1.

[0083] Next, the obtained extruded board was cut into a size with a width of 241 mm and a length of 319 mm with a circular saw, and then the cut surface of the cut board was ground with a precision grinder (PLA-BEAUTY: manufac...

Embodiment 2

[0087] Except that the mixing amount of the polymer used is 80 parts by weight of the polymer-A and the mixture of the polymer-C of 20 parts by weight (the apparent density is 0.82g / ml), operate in the same way as in Example 1 to obtain extrusion Board-D. The same measurement as in Example 1 was performed, and the results are shown in Table 1.

Embodiment 3

[0089] Except that the mixing amount of the polymer used is 20 parts by weight of the polymer-A and the mixture of the polymer-C of 80 parts by weight (the apparent density is 0.81g / ml), operate in the same way as in Example 1 to obtain extrusion Board-E. The same measurement as in Example 1 was performed, and the results are shown in Table 1.

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Abstract

Extrusion molding is performed by using a methacrylic resin extrusion plate having a plate thickness of 2.0 to 15.0 mm and formed by a mixture having an apparent density of 0.80 g / ml or above prepared by mixing spherical methacrylic resin polymer having an apparent density of 0.70 g / ml to 0.78 g / ml and cylindrical methacrylic resin polymer having an apparent density of 0.63 g / ml to 0.70 g / ml and / or flat methacrylic resin polymer having an apparent density of 0.63 g / ml to 0.70 g / ml. The brightness uniformity is controlled to be 80% or above and the plate thickness accuracy in the width direction is controlled to be within +-1.0% of the average plate thickness. There is provided a methacrylic resin extrusion plate for a light guide plate which can be preferably used for office automation devices such as a personal computer and a word processor, display devices used for various monitors displaying an image signal such as a panel monitor and a television monitor, display devices used for indoor or outdoor illumination devices and sign boards.

Description

technical field [0001] The invention relates to various monitors suitable for office automation equipment such as personal computers and word processors, displaying image signals, such as display devices used in screen monitors, TV monitors, etc., and lighting devices used in indoor and outdoor spaces. A methacrylic resin extruded plate for a light guide plate of a display device, a sign board, etc., and a manufacturing method thereof. Background technique [0002] Transparent thermoplastic resins, especially methacrylic resins, have been widely used in lighting due to their excellent light transmission and mechanical properties. Used as a light guide plate for lighting. As the method of backlighting, the following two methods are generally used: the direct type that sandwiches the light guide plate between the light source and the liquid crystal unit, and the edge lighting method that installs the light source on the edge of the light guide plate. At present, the edge ligh...

Claims

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Application Information

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IPC IPC(8): B29C47/00C08J5/18C08L33/10G02B6/00G02F1/13357B29K33/00B29L7/00B29C48/00B29C48/07B29C48/305G02F1/1335
CPCG02F1/133615B29C47/0019C08L33/10C08L2205/14B29C47/00C08L2205/02G02B6/0065B29C48/00B29C48/07C08L2666/06G02F1/1335C08J5/18
Inventor 神谷俊儿鹤田严一
Owner ASAHI KASEI CHEM CORP
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