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

Adhesive composition, adhesive agent, and adhesive sheet

A composition, adhesive technology, applied in the direction of adhesive types, non-polymer organic compound adhesives, ester copolymer adhesives, etc., can solve problems such as lifting and peeling deterioration, air bubbles, durability decline, etc. , to achieve the effect of sufficient durability and light diffusivity

Active Publication Date: 2016-11-16
LINTEC CORP
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when microparticles are added to the adhesive layer, due to the difference in thermal expansion or thermal contraction between the microparticles and the adhesive, etc., the surface of the microparticles and the adhesive will deviate due to the heat history, and the problem of bubbles will be generated.
[0005] In addition, as mentioned above, when the optical member is heat-shrinkable, the adhesive layer is also deformed, and the particles that are foreign matter are deviated from the surface of the adhesive, and the problem of air bubbles is also worrying.
In fact, when an adhesive layer containing fine particles is used for an optical member, warping and peeling due to thermal history tend to be worsened and durability tends to decrease compared to the case where no fine particles are added.

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
  • Adhesive composition, adhesive agent, and adhesive sheet
  • Adhesive composition, adhesive agent, and adhesive sheet
  • Adhesive composition, adhesive agent, and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0079] 4. Preparation method of adhesive composition

[0080] The adhesive composition P can be prepared by mixing an active energy ray-curable adhesive component and light-diffusing fine particles. When the (meth)acrylate polymer (A) is contained in the active energy ray-curable adhesive component, the (meth)acrylate polymer (A) is prepared first, and then the active energy ray-curable compound (B) is added, and A crosslinking agent (C) and additives are added as needed.

[0081] The (meth)acrylate polymer (A) can be produced by superposing|polymerizing the mixture of the monomeric unit which comprises a polymer by a normal radical polymerization method. The (meth)acrylate polymer (A) can be superposed|polymerized by the solution polymerization method etc. using a polymerization initiator as needed. As a polymerization solvent, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, etc. are mentioned, for example, and 2 or more type...

Embodiment 1

[0124] 1. Preparation of (meth)acrylate polymer

[0125] A (meth)acrylate polymer (A) was prepared by copolymerizing 94.5 parts by mass of n-butyl acrylate, 5 parts by mass of acrylic acid, and 0.5 parts by mass of 2-hydroxyethyl acrylate. As a result of measuring the molecular weight of this (meth)acrylate polymer (A) by the method mentioned later, it was 1.8 million weight average molecular weight.

[0126] 2. Preparation of Adhesive Composition

[0127] 83.5 parts by mass of the (meth)acrylate polymer (A) obtained in the above process (solid content conversion value; the same applies below), tris(acryloyloxyethyl)iso Cyanurate (manufactured by TOAGOSEI CO., LTD., product name "ARONIX M-315"; molecular weight 423) 15 parts by mass, and trimethylolpropane-modified toluene diisocyanate (Nippon Polyurethane Industry Co., Ltd., product name "CORONATE L") 0.3 parts by mass, a mixture of benzophenone and 1-hydroxycyclohexyl phenyl ketone as a photopolymerization initiator at a m...

Embodiment 2～11、 comparative example 1～6

[0147] As shown in Table 1, the addition amount of (meth)acrylate polymer (A), active energy ray-curable compound (B) and photopolymerization initiator, the type and addition amount of light-diffusing fine particles, and the adhesive were changed. Except for the thickness of the layer, a polarizing plate with an adhesive layer was prepared in the same manner as in Example 1.

[0148] Here, the said weight average molecular weight (Mw) is the polystyrene equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0149]

[0150] - GPC measurement device: HLC-8020 manufactured by Tosoh Corporation

[0151] · GPC column (passed in the following order): manufactured by Tosoh Corporation

[0152] TSK guard column HXL-H

[0153] TSK gel GMHXL (×2)

[0154] TSK gel G2000HXL

[0155] ·Measurement solvent: tetrahydrofuran

[0156] ·Measurement temperature: 40℃

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
particle sizeaaaaaaaaaa
elastic modulusaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses an adhesive composition, an adhesive agent, and an adhesive sheet. The adhesive composition comprises an active-energy-ray-curable adhesive component and light-diffusing microparticles, wherein the difference between the refractive index of the active-energy-ray-curable adhesive component and the refractive index of the light-diffusing microparticles is 0.005 to 0.2, and the average particle diameter of the light-diffusing microparticles is 0.8 to 2.9 [mu]m as determined by a centrifugal sedimentation photo-extinction method. When an adhesive agent produced from the adhesive composition is used, an optical member which has sufficient durability and a sufficient light-diffusing property and is highly precise can be provided.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive (a material obtained by curing the adhesive composition) and an adhesive sheet, and in particular to an adhesive composition, an adhesive and an adhesive suitable for use in optical members such as polarizers. piece. Background technique [0002] Generally, in a liquid crystal panel, in order to adhere|attach a polarizing plate or retardation plate to the glass substrate of a liquid crystal cell, etc., the adhesive agent layer which consists of an adhesive composition is often used. However, since optical members such as polarizers and retardation plates tend to shrink due to heat, etc., shrinkage occurs due to thermal history. The problem of durability of peeling (so-called lifting, peeling) was pointed out. [0003] On the other hand, a liquid crystal panel has advantages of being thin and consumes little power, but has a problem of insufficient brightness and viewing angle on th...

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): C09J4/00C09J7/02
CPCC08F222/10C08K2201/003C08L33/06C09J4/06C09J11/02C09J133/06C09J2203/318C09J7/385C09J2301/312C09J2301/408C08K3/36C08K2201/005
Inventor 仓本达己又野仁荒井隆行所司悟
Owner LINTEC 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