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Manufacturing method of extruded resin sheet and extruded resin sheet

A manufacturing method and technology of resin boards, applied to chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve problems such as screen brightness and color variation, difficulty in seeing images, and no public solutions , to achieve the effect of suppressing the unevenness of light and shade and color change, excellent recognition, and good surface quality

Active Publication Date: 2021-11-09
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, in the above-mentioned resin plate, when the screen is viewed with polarized sunglasses, the brightness and color change of the screen becomes uneven due to the periodic change of the retardation value, making it difficult to see the image.
However, this has not been noticed yet and no means of solving it have been made public

Method used

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  • Manufacturing method of extruded resin sheet and extruded resin sheet
  • Manufacturing method of extruded resin sheet and extruded resin sheet
  • Manufacturing method of extruded resin sheet and extruded resin sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0255] (Manufacturing method of extruded resin sheet)

[0256] A methacrylic resin (B) (glass transition temperature: 120 degrees, linear expansion coefficient: 7.30×10 -5 / K) Melting with a 65mmφ single-screw extruder [manufactured by Toshiba Machine Co., Ltd.], melting polycarbonate with a 150 mmφ single-screw extruder [manufactured by Toshiba Machine Co., Ltd.], and laminating the two through a multi-manifold type die . The laminated resin (extruded resin sheet 16, thermoplastic resin laminate in molten state) is sandwiched between figure 1 Between the shown first cooling roll 12 and the second cooling roll 13, after being wound on the second cooling roll 13, it is wound on the third cooling roll 14, thereby cooling is carried out, and the extrusion The resin plate 16 is pulled away, thereby manufacturing. The temperature (TT) of the entire resin was adjusted to 150° C. by controlling the temperatures of the second cooling roll 13 and the third cooling roll 14 . In addi...

Embodiment 2～4

[0258] Instead of the methacrylic resin (B) having a TC ratio of 20% by mass, the methacrylic resin B having the TC ratio described in the column of "methacrylic resin-containing layer" in Table 2 was used, and the temperature of the entire resin (TT) and the temperature (TX) of the whole resin were adjusted as described in Table 2, and it carried out similarly to Example 1, and produced the extruded resin board. Table 3 shows the production conditions and the evaluation results of the obtained extruded resin sheets.

Embodiment 5

[0260] An extruded resin sheet was produced in the same manner as in Example 1 as described in Table 2, using a resin composition (1) having an SMA ratio of 20 mass % instead of the methacrylic resin (B) having a TC ratio of 20 mass %. Table 3 shows the evaluation results.

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Abstract

Provided are a method for producing an extruded resin sheet having good surface properties and less periodic variation in in-plane retardation, and an extruded resin sheet. A method for producing an extruded resin sheet (16), comprising: melting a thermoplastic resin laminate in which a layer containing polycarbonate is laminated on at least one side of a layer containing a methacrylic resin from T-die head (11) co-extrusion, the process of sandwiching the above-mentioned thermoplastic resin laminate between the first cooling roll (12) and the second cooling roll (13), will be sandwiched between the second cooling roll and the second cooling roll The temperature (TX) of the entire resin between the three cooling rolls (14) is set to +10° C. or higher relative to the glass transition temperature of the polycarbonate-containing layer, and the thermoplastic resin laminate is wound from the last cooling roll At the position of peeling, the temperature (TT) of the whole resin was made into the range of -2 degreeC - +19 degreeC with respect to the glass transition temperature of the said polycarbonate-containing layer.

Description

technical field [0001] The present invention relates to extruded resin sheets. More specifically, the present invention relates to a product having a layer containing a methacrylic resin and a layer containing a polycarbonate, which has good surface properties and a small periodic change in the retardation value in the plane, and is suitable for a protective cover of a touch panel or the like. Extruded resin sheet and manufacturing method thereof. Background technique [0002] A touch panel (or touch screen) is an electronic component combined with a display device and a pointing input device. Electronic devices can be operated by touching the touch panel with a finger or a pen. Touch panels are used in ATMs of financial institutions such as banks, vending machines, mobile phones, portable information terminals (PDAs), digital audio players, portable game machines, tablet personal computers, copiers, fax machines, car navigation and other digital products. information equ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C48/88B29C48/18B32B27/30B32B27/36B29C48/885
CPCB32B27/30B32B27/36B29C48/18B29C48/885B29C48/92B29C48/914B29C48/21B32B27/08B32B27/308C08F220/18C08F222/08C08L33/12C08L35/06B29K2069/00B29K2033/08B32B2307/734B32B27/365C08F220/14C08F212/08
Inventor 船崎一男
Owner KURARAY CO LTD