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Optical laminate and method for producing optical laminate

A manufacturing method and technology of optical layer, applied in chemical instruments and methods, optics, optical components, etc., can solve the problems of high manufacturing cost, high manufacturing cost, poor processing rationality, etc., to prevent durability deterioration, reduce manufacturing cost, The effect of simple manufacturing process

Active Publication Date: 2012-07-11
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this UV curable resin tends to shrink due to UV irradiation
Therefore, the following problems arise: the thinner the base material, the more prominent the curl of the optical layered body, especially in the case of roll processing, wrinkles tend to occur in the TD direction (transverse direction), making it difficult to perform desired processing.
However, this kind of hard coating film has the following problems: the hard coating layer is composed of multiple layers, so it needs to be coated several times in the forming process, and the processing rationality is poor.
[0012] However, general ultraviolet curing is carried out by irradiating light with high ultraviolet intensity near the wavelength of 360 nm. Therefore, in the inventions described in Patent Documents 5 to 8, the entire coating film can be fully cured, but on the other hand, The hardness of the coating film near the base material becomes high, and problems such as wrinkles and spots are not sufficiently resolved
[0013] Further, in the invention described in Patent Document 7, the cost of equipment for curing the coating film is high, and the production cost becomes high. In addition, when a thin TAC film is used as a base material, there is also a problem with the TAC film. The problem of deterioration of strength

Method used

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  • Optical laminate and method for producing optical laminate
  • Optical laminate and method for producing optical laminate
  • Optical laminate and method for producing optical laminate

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0171] Production Example 1 Preparation of Coating Liquid for Hard Coat

[0172] Compositions were prepared by thoroughly mixing the following materials. This composition was filtered with the polypropylene filter of 30 micrometers of pore diameters, and the coating liquid (1)-(3) for hard-coat layers was prepared.

[0173]

[0174] UV curable resin:

[0175] 91.9 parts by mass of pentaerythritol triacrylate (PETA)

[0176] Cellulose acetate propionate (molecular weight 50000) 1.2 parts by mass

[0177] Photopolymerization initiator:

[0178]

[0179] Solvent:

[0180] 97.6 parts by mass of toluene

[0181] 24.4 parts by mass of methyl isobutyl ketone (MIBK)

[0182]

[0183] UV curable resin:

[0184] 43.1 parts by mass of pentaerythritol triacrylate (PETA)

[0185] Urethane acrylate (UV-1700B, manufactured by Nippon Synthetic Chemicals Co., Ltd.) 50.0 parts by mass

[0186] Photopolymerization initiator:

[0187]

[0188] Solvent:

[0189] 97.6 parts by...

manufacture example 2

[0200] Production Example 2 Preparation of UV Absorber

[0201] Each of the following ultraviolet absorbers was dissolved in a liquid of toluene / methyl isobutyl ketone = 70 / 30 (mass ratio) so as to be 45% by mass to prepare ultraviolet absorber liquids.

[0202] a-1) TINUVIN 478 (manufactured by Ciba Specialty Chemicals Co., Ltd., molecular weight: 678)

[0203] a-2) the compound of structural formula 1 (molecular weight is 736)

[0204] a-3) the compound of structural formula 2 (molecular weight is 680)

[0205] a-4) a compound with a weight average molecular weight of 25,000 obtained by the copolymerization of 65% by weight of the compound of structural formula 3 and 35% by weight of MMA (methyl methacrylate)

[0206] a-5) PUVA-30M (RUVA-93:MMA=30:70, weight average molecular weight is 10000)

[0207] a-6) the weight average molecular weight obtained by the compound of structural formula 4 of 65 mass % and the MMA copolymerization of 35 mass % is the compound of 20000 ...

Embodiment 1～17、 comparative example 1～10

[0216] A predetermined amount of the ultraviolet absorber liquid obtained in Production Example 2 was mixed with the coating liquid for a hard coat layer obtained in Production Example 1 to prepare a composition for a hard coat layer. Apply the obtained composition for a hard coat layer on a substrate, dry it with a warm air dryer at 70° C. for 1 minute, and then use a high-pressure mercury lamp under nitrogen purge (oxygen concentration is 200 ppm or less), using a lamp output A lamp manufactured by Fusion Corporation with a power of 240 W / cm was irradiated with ultraviolet light so that the output amount was adjusted so that the total irradiation amount became a predetermined amount in one irradiation, and an optical layered body having a hard coat layer was prepared.

[0217] In addition, the base material used, the coating liquid for hard-coat layers, ultraviolet absorber and its concentration, additives, lamp output, ultraviolet-ray irradiation amount, and the film thickne...

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Abstract

Disclosed is an optical laminate which is prevented from occurrence of curling (warping), while maintaining adequate pencil hardness and having excellent durability. The optical laminate is capable of preventing decrease in durability of an image display screen due to the outside light when used as a protection film for the image display screen. Specifically disclosed is an optical laminate in which at least a hard coat layer is formed on a light-transmitting substrate. The optical laminate is characterized in that: the hard coat layer is obtained by curing a composition for the hard coat layer containing a polyfunctional ultraviolet-curable (meth)acrylate resin, an ultraviolet absorbent and a photopolymerization initiator by irradiation of ultraviolet light; the hard coat layer has a Martens hardness (A) of 230-320 N / mm2 in a surface that is on the reverse side of the light-transmitting substrate-side surface; the light-transmitting substrate-side surface of the hard coat layer has a Martens hardness (B) of 160-250 N / mm2; the Martens hardness (A) is larger than the Martens hardness (B); and the elastic modulus of the hard coat layer is continuously changed in the thickness direction.

Description

technical field [0001] The present invention relates to an optical layered body and a method for producing the optical layered body. Background technique [0002] As a protective film for image display screens such as display screens, monitors, and touch screens, it is known that there are hard coat properties (scratch resistance), antistatic properties (prevention of dust adhesion, and prevention of liquid crystal orientation disorder caused by static electricity). Optical laminates with functions such as reflectivity (improving visibility), anti-glare, anti-fouling, and (fingerprint prevention). [0003] In such an optical layered body, especially when used in a liquid crystal display, a triacetyl cellulose film (hereinafter referred to as a TAC film) is used as a base material from the viewpoint of excellent birefringence and transparency. However, when a TAC film is used as a base material, it is difficult to form a film by a melting method, and the base material has to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/10B32B7/02B32B27/30
CPCC08G18/673C09D175/16B29D11/0073G02B1/105C08F290/067G02B1/04G02B1/14
Inventor 高宫博幸上野健治威能正隆佐藤健太
Owner DAI NIPPON PRINTING CO LTD
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