Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same

A retardation film, adhesive layer technology, applied in polarizing elements, layered products, instruments, etc., can solve the problems of adhesive layer peeling, liquid crystal cell paste residue, operability deterioration, etc., to achieve excellent reusability , excellent adhesion, and the effect of realizing productivity

Inactive Publication Date: 2012-03-28
SUMITOMO CHEM CO LTD
6 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0008] However, retardation films made of chain polyolefin-based resins such as polypropylene-based resins have a problem of poor adhesion to adhesives compared with retardation films made of cyclic polyolefin-based resins.
Specifically, the phase difference film is usually bonded to the liquid crystal cell through an adhesive layer, but when the phase difference film is peeled off from the liquid crystal ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

Disclosed is an adhesive layer-attached retardation film (10), which comprises a retardation film (20) comprising a polypropylene resin, a primer layer (30) laminated on the surface of the retardation film (20), and an adhesive layer (40) laminated on the surface of the primer layer (30), wherein the primer layer (30) comprises a thermoplastic polyester resin composed of diol units and dicarboxylic acid units and having a weight average molecular weight of 10,000 to 150,000, and wherein a unit represented by formula (I) [wherein R represents a methylene group or an ethylene group; and n represents 1 or 0] makes up 40 to 80 mol% of the total amount of the diol units. In the adhesive layer-attached retardation film (10), the adhesion between the retardation film and an adhesive agent is improved. Also disclosed are an elliptical polarizing plate and a liquid crystal display device, each of which utilizes the adhesive layer-attached retardation film.

Application Domain

Technology Topic

Image

  • Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same
  • Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same
  • Adhesive layer-attached retardation film, and elliptical polarizing plate and liquid crystal display device each utilizing same

Examples

  • Experimental program(4)
  • Comparison scheme(2)
  • Effect test(1)

Example Embodiment

[0152] (Production Example 1: Production of retardation film)
[0153] A propylene/ethylene random copolymer containing approximately 5% of ethylene units ("Sumitomo Nippon W151" manufactured by Sumitomo Chemical Co., Ltd.) was formed into a film to obtain a roll film composed of a polypropylene resin having a thickness of 40 μm. By uniaxially stretching the roll film in the transverse direction, a uniaxial retardation film is obtained. For this retardation film, the in-plane retardation value R 0 =90nm, the retardation value R in the thickness direction th =45nm, the thickness is 9μm. Then, a self-adhesive surface protection film manufactured by Toray Film Processing Co., Ltd., which is a brand name "Toretec 7332", was bonded to one side of the retardation film made of polypropylene resin.

Example Embodiment

[0154] [Example 1]
[0155] (a) Preparation of coating liquid for undercoat layer
[0156] A polyester resin (I) with a weight average molecular weight of 35,000 containing structural units derived from neopentyl glycol, ethylene glycol, terephthalic acid, and isophthalic acid was dissolved in toluene: methyl ethyl ketone = 4: In the mixed solvent of 1, a coating liquid for an undercoat layer having a polyester resin (I) concentration of 10% was prepared. The content ratio of the structural unit derived from neopentyl glycol, ethylene glycol, terephthalic acid, and isophthalic acid in the polyester resin (I) is 1:1:1:1 in terms of molar ratio.
[0157] (b) Formation of undercoat layer for retardation film
[0158] On the surface of the retardation film made of polypropylene resin obtained in Production Example 1 on the side opposite to the surface on which the surface protection film was laminated, the cumulative exposure was 15.9 kJ/m 2 Implement corona discharge treatment. Within 5 minutes after the corona discharge treatment, the corona treated surface was coated with the above-mentioned primer coating liquid using a Meyer rod (#5), and then dried in an oven at 80°C for 3 minutes. An undercoat layer with a thickness of 3.1 μm was formed on the retardation film.
[0159] (c) Production of elliptically polarizing plate
[0160] A polarizing plate (SRW062 manufactured by Sumitomo Chemical Co., Ltd.) was prepared with a protective film made of triacetyl cellulose bonded to both sides of a polarizing film in which iodine was oriented on polyvinyl alcohol, and polyurethane was laminated on one side Acrylate-based sheet adhesive (NS300MP purchased from Lintec), and a polarizing plate with an adhesive layer was produced. On the other hand, the surface protective film was peeled off from the undercoated retardation film produced in (b) above, and the cumulative exposure amount was 15.9kJ/m on this surface (polypropylene resin surface) 2 The corona discharge treatment was performed, and within 5 minutes after the corona discharge treatment, the polarizing plate with an adhesive layer produced as described above was bonded using the adhesive layer on the corona treated surface. Then, the cumulative irradiation dose is 15.9kJ/m on the undercoat side 2 Implemented corona discharge treatment. Within 5 minutes after the corona discharge treatment, an acrylic sheet adhesive (P3132 purchased from Lintec) was bonded to the corona-treated surface to produce an elliptically polarizing plate with an adhesive layer. The elliptically polarizing plate with an adhesive layer obtained here has a layer structure of sheet adhesive (P3132)/undercoat layer/polypropylene retardation film/sheet adhesive (NS300MP)/polarizing plate.

Example Embodiment

[0161] [Example 2]
[0162] A polyester resin (II) with a weight average molecular weight of 33,000 containing constituent units derived from neopentyl glycol, ethylene glycol, terephthalic acid, isophthalic acid, and 5-sodium isophthalate is dissolved in In the mixed solvent of toluene: methyl ethyl ketone = 1:1, the coating solution for the primer layer having a concentration of 10% of the polyester resin (II) thus obtained was used. Other than that, the same as in the examples 1 In the same manner, an elliptically polarizing plate with an adhesive layer was produced. The content of the constituent units derived from neopentyl glycol, ethylene glycol, terephthalic acid, isophthalic acid, and 5-sodium isophthalate in the polyester resin (II) is calculated as a molar ratio 1:1:1:1:1:0.005.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thickness3.1µm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

Classification and recommendation of technical efficacy words

  • Achieve productivity
  • Excellent adhesion

Plug-in used for test sorter

ActiveCN103586214AAvoid contactAchieve productivitySortingFusion weldingEngineering
Owner:TECHWING CO LTD

Switching method and system for business modes

ActiveCN104298555AAchieve productivityReach salesProgram initiation/switchingDevice typeBusiness function
Owner:AEROSPACE INFORMATION

Optical-use pressure-sensitive adhesive sheet

InactiveUS20110112249A1Excellent in visibility and outward appearance retentivityExcellent adhesionMonocarboxylic acid ester polymer adhesivesPolarising elementsPressure sensitiveChemistry
Owner:NITTO DENKO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products