Extruded resin sheet manufacturing method and extruded resin sheet

A manufacturing method and resin board technology, which is applied in the field of extruded resin boards, can solve the problems of reduced retardation value, uncontrollable range, and reduced retardation value of resin boards, and achieve good surface properties, resistance to heating processes, and occurrence of warpage inhibitory effect

Active Publication Date: 2018-11-09
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, since the resin plate is exposed to high temperature, the retardation value decreases and sometimes cannot be controlled within the desired range
[0015] In addition, when in-vehicle display devices such as car navigation systems using liquid crystal displays, mobile phones, and smartphones are placed in the car under the sunlight in summer, the liquid crystal display protective plate may still be heated to high temperatures, and the resin The delay value of the board may be reduced by

Method used

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  • Extruded resin sheet manufacturing method and extruded resin sheet
  • Extruded resin sheet manufacturing method and extruded resin sheet
  • Extruded resin sheet manufacturing method and extruded resin sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0262] (Manufacturing method of extruded resin sheet)

[0263] 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 drawn away to manufacture an extruded resin plate. The resin temperature (TT) was adjusted to 150° C. by controlling the temperatures of the second cooling roll 13 and the third cooling roll 14 . In addit...

Embodiment 2～4

[0265] Instead of methacrylic resin B having a TC ratio of 20% by mass, the methacrylic resin B having a TC ratio described in the column "Methacrylic resin-containing layer" of Table 2 was used, and the resin temperature (TT) was set as Except having adjusted as described in Table 2, it carried out similarly to Example 1, and produced the extruded resin board. Table 2 shows the production conditions and the evaluation results of the obtained extruded resin sheets.

Embodiment 5

[0267] 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% by mass instead of the methacrylic resin B having a TC ratio of 20% by mass.

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Abstract

An extruded resin sheet manufacturing method comprising a step for extruding a thermoplastic resin laminate (16), in which a layer containing a methacrylic resin with a glass transition temperature ofat least 115 DEG C is laminated on at least one surface of a polycarbonate-containing layer, from a T-die (11) in a melted state, wherein at the position in which the thermoplastic resin laminate (16) is peeled from a cooling roll (14) onto which the laminate is ultimately wound, the temperature of the resin as a whole is made to be in the range of -2 DEG C to +15 DEG C with respect to the glasstransition temperature of the polycarbonate-containing layer and the circumferential velocity ratio (V4 / V2) of the circumferential velocity (V4) of drawing rolls (15) to the circumferential velocity (V2) of a second cooling roll (13) is made to be 0.98 to 1.01.

Description

technical field [0001] The present invention relates to extruded resin sheets. More specifically, the present invention relates to a protective cover suitable for a touch panel that has good surface properties, suppresses the occurrence of warpage due to residual stress, and can control the in-plane retardation value even in a high-temperature environment. Extruded resin sheet comprising a layer of methacrylic resin and a layer comprising polycarbonate, and a method for producing the same. 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 a...

Claims

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Application Information

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IPC IPC(8): B29C47/06B29C47/88B29L9/00B29C48/885B29C48/92
CPCB29C48/18B29C48/885B29C48/92B29C48/022B29C48/914B29C48/91C08L33/12C08L35/06C08L69/00B29K2069/00
Inventor 船崎一男
Owner KURARAY CO LTD
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