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Double-sided adhesive layer-equipped optical laminate

A technology for optical laminates and adhesive layers, which can be applied to optical, film/sheet-like adhesives, adhesives, etc., and can solve problems such as damage to the low-refractive index layer

Active Publication Date: 2021-05-07
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in vacuum lamination, breakage of the low refractive index layer sometimes occurs

Method used

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  • Double-sided adhesive layer-equipped optical laminate
  • Double-sided adhesive layer-equipped optical laminate
  • Double-sided adhesive layer-equipped optical laminate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0135] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. In addition, the measurement method of each characteristic is as follows.

[0136] (1) Refractive index of low refractive index layer

[0137] After forming a low-refractive-index layer on an acrylic film, it was cut into the size of 50 mm x 50 mm, and this was bonded to the surface of a glass plate (thickness: 3 mm) via an adhesive layer. The back center of the glass plate (about 20 mm in diameter) was filled with a black marker to obtain a sample in which reflection did not occur on the back side of the glass plate. The above sample was set in an ellipsometer (manufactured by J.A. Woollam Japan: VASE), and the refractive index was measured at a wavelength of 500 nm and an incident angle of 50 to 80 degrees.

[0138] (II) Breakage of the low refractive index layer

[0139] A light guide plate with a thickness of 400 μm was bonded to a liquid crys...

manufacture example 1

[0144] [Manufacturing Example 1] Preparation of Coating Liquid for Low Refractive Index Layer Formation

[0145] (1) Gelation of silicon compounds

[0146]A mixed liquid A was prepared by dissolving 0.95 g of methyltrimethoxysilane (MTMS) which is a precursor of a silicon compound in 2.2 g of dimethyl sulfoxide (DMSO). 0.5 g of a 0.01 mol / L aqueous oxalic acid solution was added to this mixed liquid A, and stirred at room temperature for 30 minutes to hydrolyze MTMS to produce a mixed liquid B containing trihydroxymethylsilane.

[0147] After adding 0.38 g of 28% by weight ammonia water and 0.2 g of pure water to 5.5 g of DMSO, the above-mentioned mixed solution B was further added, and stirred at room temperature for 15 minutes, thereby performing gelation of trihydroxymethylsilane to obtain A mixed solution C containing a gel-like silicon compound was obtained.

[0148] (2) Aging treatment

[0149] The mixture C containing the gel-like silicon compound prepared as describ...

manufacture example 2

[0153] [Manufacturing Example 2] Preparation of an adhesive constituting the first adhesive layer

[0154] In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen inlet tube, and a condenser, 90.7 parts of butyl acrylate, 6 parts of N-acryloylmorpholine, 3 parts of acrylic acid, and 0.3 parts of 2-hydroxybutyl acrylate were prepared as 0.1 part by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator was added together with 100 g of ethyl acetate, and after nitrogen replacement was carried out by introducing nitrogen gas while stirring slowly, the liquid temperature in the flask was kept at around 55°C , for 8 hours of polymerization reaction to prepare an acrylic polymer solution. With respect to 100 parts of the solid content of the obtained acrylic polymer solution, 0.2 parts of an isocyanate crosslinking agent (CORONATE L manufactured by Nippon Polyurethane Industry Co., Ltd., an adduct of trimethylolpropane toluene diisocyanate), per...

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Abstract

Provided is a double-sided adhesive layer-equipped optical laminate which maintains excellent low refraction index layer properties while suppressing damage to a low refraction index layer during vacuum lamination. The double-sided adhesive layer-equipped optical laminate has a substrate, a low refraction index layer formed on the substrate, a first adhesive layer positioned next to the low refraction index layer, and a second adhesive layer which serves as one of the outermost layers. The porosity of the low refraction index layer is at least 50%. The storage modulus of the first adhesive layer is 1.3*105-1.0*107(Pa). The storage modulus of the second adhesive layer is 1.0*105(Pa) or less.

Description

technical field [0001] The present invention relates to an optical laminate with double-sided pressure-sensitive adhesive layers. Background technique [0002] In an optical device (for example, an image display device, an illumination device) that uses a light guide plate to extract light, it is known that when the light guide plate is laminated A technology for stacking layers with low refractive index layers interposed therebetween. According to such a technique, it has been reported that the use efficiency of light is higher by interposing the low-refractive index layer than in the case of simply laminating with only an adhesive. In addition, depending on the configuration of the light guide plate and / or the peripheral optical member, vacuum lamination in which these are laminated in a vacuum may be employed. However, in vacuum lamination, breakage of the low-refractive index layer sometimes occurs. [0003] prior art literature [0004] patent documents [0005] Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/111B32B3/26B32B7/022B32B7/023C09J7/29C09J7/38
CPCC09J7/29C09J7/38C09J2301/1242C09J2301/312C09J2203/318C09J2433/00C09J2483/006G02B1/11G02B2207/107G02B2207/109B32B7/022B32B7/023B32B7/12C09J2301/124G02B1/14C09J7/385Y10T428/249982Y10T428/2848
Inventor 服部大辅岸敦史森岛谅太
Owner NITTO DENKO CORP