Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device

A technology of adhesive layer and adhesive, which is applied in the field of optical film, can solve problems such as deformation of the adhesive layer, and achieve the effect of suppressing foaming and high bonding reliability

Pending Publication Date: 2019-05-21
NITTO DENKO CORP
View PDF17 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, an optical film (such as a polarizing film) tends to shrink due to heat treatment, and the adhesive layer itself is also deformed due to the shrinkage of the polarizing film.

Method used

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device
  • Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device
  • Optical adhesive layer, manufacturing method of optical adhesive layer, optical film with adhesive layer, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] (Preparation of (meth)acrylic polymer (A1))

[0147] A monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate was charged into a 4-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a condenser. Further, 0.1 part of 2,2'-azobisisobutyronitrile was added as a polymerization initiator to 100 parts of the above-mentioned monomer mixture together with 85 parts of ethyl acetate and 15 parts of toluene, and nitrogen gas was introduced while stirring slowly to carry out nitrogen replacement. After that, the liquid temperature in the flask was maintained at around 55° C., and the polymerization reaction was carried out for 30 minutes to prepare a (meth)acrylic polymer (A1) with a weight average molecular weight (Mw) of 1.44 million and Mw / Mn=1.75. solution.

[0148] (Preparation of Adhesive Composition)

[0149] With respect to 100 parts of solid content of the solution of the above-mentioned ...

Embodiment 2～18、 and comparative example 1～5

[0173] In Examples 2 to 18 and Comparative Examples 1 to 5, the production methods of the above-mentioned (meth)acrylic polymers (A2) to (A12) were changed in the same manner as in Example 1, and the changes were made as shown in Table 1. The types of monomers, their mixing ratios, and the production conditions were controlled to prepare (meth)acrylic polymers with the polymer properties (weight-average molecular weight (MW), polydispersity coefficient (Mw / Mn)) shown in Table 1. Solutions of (A2) to (A12).

[0174] In addition, except that the type or amount of the crosslinking agent was changed as shown in Table 1 with respect to each obtained (meth)acrylic polymer solution, an acrylic adhesive set was prepared in the same manner as in Example 1. solution of substances. Moreover, the polarizing film with an adhesive layer was produced similarly to Example 1 using the solution of the said acrylic adhesive composition.

[0175] The following evaluations were performed about t...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The purpose of the present invention is to provide: an optical adhesive layer which can suppress the occurrence of foaming, peeling, lifting, etc., on an adherend (an optical film) under heating and humidification conditions, and which has high adhesion reliability and excellent durability at high temperatures; an optical film with adhesive layer, having the aforementioned optical adhesive layer on at least one surface of the optical film; and a liquid crystal display device which uses the aforementioned optical film with adhesive layer. The optical adhesive layer, formed from an adhesive composition containing a (meth)acrylic polymer, is characterized by having a 70% or higher gel fraction, and a 55 [mu]m or higher creep value when applying a load of 500g for one hour in a 115 degrees centigrade environment.

Description

technical field [0001] The present invention relates to an optical pressure-sensitive adhesive layer, a method for producing the optical pressure-sensitive adhesive layer, and an optical film with a pressure-sensitive adhesive layer having the above-mentioned optical pressure-sensitive adhesive layer on at least one surface of the optical film. Moreover, this invention relates to image display devices, such as a liquid crystal display device, an organic electroluminescent display device, and PDP using the said optical film with an adhesive layer. As the optical film, a polarizing film (polarizing plate), a retardation film, an optical compensation film, a brightness improving film, and an optical film in which the above films are laminated can be used. Background technique [0002] For liquid crystal display devices and the like, it is essential to arrange polarizing elements on both sides of the liquid crystal cell from the viewpoint of the image forming method, and usually...

Claims

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

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/10C09J11/06C09J133/00C09J133/14C09J133/24G02B5/30
CPCC09J133/14G02F2202/28G02F2203/09G02F2201/50G02F1/1335G02B5/3033G02B1/18C09J7/385C09J2203/318C08F220/1804C09J133/066C09J175/04C08G18/6229C08G18/6283C08G18/8025C08G2170/40C09J2301/312C08F220/20C08F220/301C08F226/10C08F220/06C09J11/06C08F220/56C09J133/26C08K5/14C08K5/48C08F2438/00C08F2500/01C08F2500/03G02B5/305G02F1/133528G02F2202/022C09J133/00C09J133/24C09J7/00H10K59/00
Inventor 木村智之小野宽大杉野晶子外山雄祐
Owner NITTO DENKO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com