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Extruded resin sheet and manufacturing method thereof

A manufacturing method and technology of resin boards, applied in the direction of chemical instruments and methods, synthetic resin layered products, flat products, etc., can solve the problems of delay and surface reduction, and achieve the effect of good surface and less warping

Pending Publication Date: 2019-12-17
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Usually, extruded resin sheets are subjected to stress during molding, whereby molecules are oriented and retarded (see paragraph 0034 of Patent Document 8).
In addition, in an extruded resin sheet including a plurality of resin layers, the degree of residual stress of each resin layer may be different.
In addition, in the molding of an extruded resin sheet, streaky defects (so-called chatter marks) may occur on the surface of the extruded resin sheet when it is separated from the last cooling roll, and the surface properties may be reduced.

Method used

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  • Extruded resin sheet and manufacturing method thereof
  • Extruded resin sheet and manufacturing method thereof
  • Extruded resin sheet and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0239] [Example 1] (manufacture of extruded resin sheet)

[0240] use image 3 The manufacturing apparatus shown, forms an extruded resin sheet.

[0241] A methacrylic resin (B1) (MMA / TCDMA copolymer, TC ratio of 20% by mass) melted using a 65 mmφ single-screw extruder (manufactured by Toshiba Machine Co., Ltd.) and a 150 mmφ single-screw extruder (manufactured by Toshiba Machine Co., Ltd.) Co., Ltd.) molten polycarbonate (PC1) was laminated through a multi-manifold die, and the molten thermoplastic resin laminate was co-extruded from a T-die.

[0242] Next, the thermoplastic resin laminate in the molten state is sandwiched between the first cooling roll and the second cooling roll adjacent to each other, wound on the second cooling roll, and sandwiched between the second cooling roll and the third cooling roll. Between, and wound on the third cooling roll, thereby cooling. The extruded resin sheet obtained after cooling is pulled off by a pair of take-off rollers. In addi...

Embodiment 2～13

[0246] Change the composition and production conditions of the methacrylic resin-containing layer as shown in Table 1-1 and Table 1-2, and operate in the same manner as in Example 1 except that, to obtain a methacrylic resin-containing layer (surface layer 1 )-extruded resin sheet of a two-layer structure of a laminated structure of a polycarbonate layer (surface layer 2). Table 2 shows the evaluation results of the extruded resin sheets obtained in each example.

Embodiment 14、15

[0248] use image 3 The manufacturing apparatus shown, forms an extruded resin sheet. The methacrylic resin melted using a 65mmφ single-screw extruder, the polycarbonate melted using a 150mmφ single-screw extruder, and the methacrylic resin melted using a 65mmφ single-screw extruder were processed by means of a multi-manifold type die. Lamination, co-extrusion of the three-layer thermoplastic resin laminate in the molten state from a T-die, cooling with the first to third cooling rolls, and drawing the cooled extruded resin sheet with a pair of take-off rolls Leave.

[0249] An extruded resin sheet with a three-layer structure having a laminated structure of a methacrylic resin-containing layer (surface layer 1)-polycarbonate-containing layer (inner layer)-methacrylic resin-containing layer (surface layer 2) was obtained as described above . The two methacrylic resin-containing layers had the same composition. In the extruded resin sheet, the thicknesses of the two methacr...

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Abstract

The present invention provides a method for producing an extruded resin sheet suitable as a protective sheet for a liquid crystal display or the like. Co-extrude a laminate in which a methacrylic resin-containing layer is laminated on at least one side of a polycarbonate-containing layer from a T-die in a molten state, and cool using three or more cooling rolls adjacent to each other, The obtained extruded resin sheet was taken off with a take-off roller. The overall temperature (TX) of the laminate when sandwiched between the second cooling roll and the third cooling roll is equal to or higher than the glass transition temperature (Tg(PC)) of the polycarbonate-containing layer + 10°C , the overall temperature (TT) of the laminate at the position peeled from the last cooling roll was set to be in the range of −2°C to +19°C with respect to Tg(PC). The peripheral speed ratio (V4 / V2) of the peripheral speed (V4) of the lead-off roll to the peripheral speed (V2) of the second cooling roll is set to be 0.98 or more and less than 1.0.

Description

technical field [0001] The present invention relates to a manufacturing method of an extruded resin sheet and an extruded resin sheet. Background technique [0002] Flat-panel displays such as liquid crystal displays, and touch-panel displays that combine the flat-panel display with a touch panel (also called a touch screen) are used in ATMs of financial institutions such as banks; vending machines; mobile phones (including smart Mobile phones), tablet personal computers and other portable information terminals (PDAs), digital audio players, portable game consoles, copiers, fax machines and car navigation systems and other digital information equipment. [0003] In order to prevent surface scratches, etc., a transparent protective plate is provided on the surface of a liquid crystal display, a touch panel, and the like. Conventionally, tempered glass has been mainly used as a protective plate, but from the viewpoint of workability and weight reduction, transparent resin pla...

Claims

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Application Information

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IPC IPC(8): B29C48/21B29C48/885
CPCB29C48/885B29K2033/12B29K2069/00B29D7/01B29C48/914B29C48/92B29C2948/9258B29C2948/92704B29C48/022B29C48/07B29C48/21B29C2948/92942B29C2948/92923B32B2255/10B32B27/308B32B27/306B32B2250/02B32B2457/208B32B2255/26B32B2307/554B32B27/286B32B2605/08B32B27/285B32B27/42B32B2250/03B32B27/32B32B27/38B32B2270/00B32B27/281B32B2307/412B32B2307/558B32B27/365B32B7/027B32B2307/416B32B27/36B32B2307/40B32B2457/202B32B27/288B32B27/283B32B2307/306B32B27/08B32B2250/24B32B27/20B29C48/18B29C48/88
Inventor 船崎一男
Owner KURARAY CO LTD
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