Substrate for surface protective film, method for manufacturing substrate, and surface protective film using substrate

A technology for protecting films and substrates, applied in the direction of film/sheet-shaped adhesives, instruments, polarizing elements, etc., can solve problems such as rainbow unevenness, efficiency reduction, and optical inspection accuracy reduction, and achieve excellent flexibility or Effects of bending resistance and phase difference in small planes

Pending Publication Date: 2020-03-06
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With conventional surface protection films, light leakage, coloring, rainbow-like unevenness, etc. may occur during optical inspection, which may cause a decrease in the accuracy of optical inspection
As a result, although there is no problem in the image display device itself, it may be judged to be defective in the optical inspection before shipment, and thus, there is a problem that the efficiency from the manufacture of the image display device to shipment is reduced.

Method used

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  • Substrate for surface protective film, method for manufacturing substrate, and surface protective film using substrate
  • Substrate for surface protective film, method for manufacturing substrate, and surface protective film using substrate
  • Substrate for surface protective film, method for manufacturing substrate, and surface protective film using substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] 1-1. Preparation of polymer alloy

[0102] As raw materials, the following were used.

[0103] FDPM: 9,9-bis(2-methoxycarbonylethyl)fluorene [dimethyl ester of 9,9-bis(2-carboxyethyl)fluorene (or fluorene-9,9-dipropionic acid)] , was synthesized in the same manner except that tert-butyl acrylate described in Example 1 of JP-A-2005-89422 was changed to methyl acrylate [37.9 g (0.44 mol)].

[0104] BPEF: 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene, manufactured by Osaka Gas Chemicals Co., Ltd.

[0105] EG: ethylene glycol

[0106] PC: Bisphenol A type polycarbonate resin, "Iupilon H-4000" manufactured by Mitsubishi Engineering-Plastics Corporation

[0107] 1.00 moles of FDPM, 0.80 moles of BPEF, and 2.20 moles of EG were added as a transesterification catalyst of manganese acetate tetrahydrate 2×10 -4 Mole and calcium acetate monohydrate 8×10 -4 Mole, slowly heated and melted while stirring. After heating up to 230°C, add trimethyl phosphate 14×10 -4 mole, germanium...

Embodiment 2

[0114] Except having set the stretching speed to 3.1% / sec in both the longitudinal direction and the width direction, it carried out similarly to Example 1, and obtained the base material for surface protection films. Re(550) of the obtained substrate for a surface protection film was 10 nm, Rth(550) was 81 nm, haze was 0.2%, and the MIT test value exceeded 2000 times which is the upper limit. The obtained substrate for a surface protection film was subjected to the evaluations of (4) and (5) above. The results are shown in Table 1.

Embodiment 3

[0116] Except having set the stretching speed to 6.5% / sec in both the longitudinal direction and the width direction, it carried out similarly to Example 1, and obtained the base material for surface protection films. Re(550) of the obtained substrate for a surface protection film was 20 nm, Rth(550) was 85 nm, haze was 0.3%, and the MIT test value exceeded 2000 times which is the upper limit. The obtained substrate for a surface protection film was subjected to the evaluations of (4) and (5) above. The results are shown in Table 1.

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Abstract

The invention provides a substrate for a surface protective film, a method for manufacturing the substrate, and the surface protective film using the substrate. Provided is a substrate for a surface protective film which has excellent flexibility or bending resistance and can satisfactorily suppress light leakage, coloring and rainbow unevenness during optical inspection. The substrate for the surface protective film is composed of a film containing a polymer alloy of a fluorene ring-containing polyester and an aromatic polycarbonate, has an in-plane retardation Re (550) of 30 nm or less, andhas 500 or more times of bending up to breakage in an MIT test. The method for producing the substrate for the surface protective film of the present invention includes forming a film forming materialcontaining a polymer alloy of a fluorene ring-containing polyester and an aromatic polycarbonate into a film, and successively and simultaneously biaxially stretching the formed film.

Description

technical field [0001] The present invention relates to a base material for a surface protection film, a method for producing the base material, a surface protection film using the base material, and an optical film with a surface protection film. Background technique [0002] For an optical film (for example, a polarizing plate, a laminate containing a polarizing plate), in order to protect the optical film (ultimately an image display device) until the actual use of the image display device to which the optical film is applied, the Attached with a surface protection film. In practice, an image display device is produced by bonding a laminate of an optical film / surface protection film to a display unit, and the image display device is subjected to an optical test (for example, a lighting test) in a state where the laminate is bonded. After that, the surface protection film is peeled off and removed at an appropriate time. A surface protection film typically has a resin fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L67/02C08J5/18C09J7/25G02B1/14G02B5/30
CPCC08J5/18C09J7/25G02B1/14G02B5/3033C08J2369/00C08J2467/02C08L67/00C08L69/00C08G63/6826C08G63/197C08G64/04C09J7/255B29C55/12G02B1/04
Inventor 中原步梦清水享
Owner NITTO DENKO CORP
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