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Optical sheet and method for manufacturing same

A technology for optical sheets and manufacturing methods, which is applied in chemical instruments and methods, optics, optical components, etc., can solve problems such as difficulty in uniform transfer, thermoplastic resin is too late to solidify and cool, and it is difficult to control the film thickness of sheet molded products, etc., to achieve High transfer rate and improved transferability

Active Publication Date: 2015-11-25
MITSUBISHI GAS CHEM CO INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the die set temperature or roll set temperature is too high, the thermoplastic resin will not have time to solidify and cool during the process of pressing between the forming chill roll and pressure contact roll until the sheet is peeled off from the forming chill roll. Sheet molded product sticks to the cooling roll for forming, and appearance defect called peeling mark occurs
Therefore, there is a limit to increasing the set temperature of the mold or roll
In addition, when the crimping pressure is increased too much, the roll will bend if the roll rigidity is insufficient, and it will be difficult to control the film thickness of the sheet molded product or to transfer uniformly.

Method used

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  • Optical sheet and method for manufacturing same
  • Optical sheet and method for manufacturing same
  • Optical sheet and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] In Example 1, as the polycarbonate resin, Iupilon S-3000N (Tg: 145° C.) manufactured by Mitsubishi Engineering Plastics Co., Ltd. was used, and as the amorphous polyamide resin, the polyamide resin GrilamidTRXE3805 (Tg: 153° C.) manufactured by EMS Corporation was used. ℃). polycarbonate resin with The single-screw extruder with vents is plasticized, and the amorphous polyamide resin is used A vented single-screw extruder was used for plasticizing, using an 800mm wide multi-manifold die set at 280°C (refer to Figure 5 Die 42) is laminated and extruded into a sheet shape. The sheet-like molten resin flowed out from the lips of the mold was transparent, and no conspicuous samples such as point defects such as gel and blotches or streaky appearance defects were observed.

[0091] After introducing the laminated sheet-like molten resin into the polishing roll unit and passing it through, the extrusion rate (rotational speed of the screw of the extruder) and the line s...

Embodiment 2

[0107] In Example 2, the brand of polycarbonate resin was changed to IupilonH-3000N (Tg: 142° C.) manufactured by Mitsubishi Engineering Plastics Corporation, and the type of amorphous polyamide resin was changed to polyamide resin Grivory G-21 manufactured by EMS Corporation. (Tg: 125° C.), the mold temperature setting was changed to 270° C., and the set temperature of the metal elastic roller for pressure bonding was changed to 120° C., the operation was exactly the same as that of Example 1. Problems during molding did not occur, and a multilayer sheet having a very good appearance level was obtained. The prism transfer ratio of the obtained prism sheet was 83%, and the peel strength between the polycarbonate resin layer and the amorphous polyamide resin layer was 3.1 N / m.

Embodiment 3

[0124] In Example 3, except having changed the brand of polycarbonate resin to IupilonH-4000N by Mitsubishi Engineering-Plastics Corporation, it carried out exactly the same as Example 2. No problems in molding and the like occurred, and a multilayered prism sheet having a high appearance level was obtained. The prism transfer ratio of the prism sheet was 88%, and the peel strength between the polycarbonate resin layer and the amorphous polyamide resin layer was 3.1 N / m.

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Abstract

Provided is a method for manufacturing an optical sheet capable of sufficiently improving transfer properties of a fine irregular structure, and an optical sheet formed using the method. This optical sheet is obtained by layering, using coextrusion molding, a first layer containing a polycarbonate resin and a second layer containing an amorphous polyamide resin, the boundary surface between the first layer and the second layer being separable, and a fine irregular shape being formed on the surface of the first layer and / or the second layer. The optical sheet having a plurality of layers in this manner enables making the entire sheet thicker during melt extrusion molding, thereby enabling maintaining an adequate amount of heat in the layered body during molding, and enabling improvement of transfer properties of the fine irregular structure. Further, by using only one layer due to separation, the optical sheet can also be made thinner.

Description

technical field [0001] The present invention relates to an optical sheet and its manufacturing method. The optical sheet of the present invention is suitable for improving brightness and viewing angle of various display devices represented by televisions, lighting equipment, digital signage and the like. Background technique [0002] When performing melt extrusion molding of a thermoplastic resin sheet, a forming cooling roll having a fine uneven structure on the surface is often used, and by transferring the fine uneven structure to the surface of the sheet, a sheet made of thermoplastic resin can be molded The surface of the product is endowed with various functions. For example, by providing a fine prism structure on the surface of the roll and transferring the prism structure, a highly functional brightness-improving sheet can be produced by melt extrusion molding. [0003] When such a sheet molded product is melt-extruded, a sheet formed of thermoplastic resin in a mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02B32B3/30B32B27/34B32B27/36G02B3/00G02F1/1335
CPCB32B3/30B32B27/08B32B27/34B32B27/365B32B2307/542B32B2307/702B32B2457/00B32B2457/20G02B3/0031G02B3/005G02B3/0056G02B5/0231B29D7/01B32B7/06B32B2307/40B29D11/0073B29K2069/00B29K2077/00G02B1/04
Inventor 柿木修武田圣英杉山真隆
Owner MITSUBISHI GAS CHEM CO INC
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