Unlock instant, AI-driven research and patent intelligence for your innovation.

Adhesives and Adhesive Sheets

An adhesive, polymer technology, applied in the direction of adhesive types, ester copolymer adhesives, adhesives, etc., can solve problems such as part peeling, and achieve excellent processability, low dielectric constant, and high adhesion. Effect

Active Publication Date: 2019-04-16
NIPPON CARBIDE KOGYO KK
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, impacts such as dropping of portable electronic devices may cause the parts that make up the touch panel to peel off.

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
  • Adhesives and Adhesive Sheets
  • Adhesives and Adhesive Sheets
  • Adhesives and Adhesive Sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] [Manufacture of (meth)acrylic polymer]

[0143] 147 parts by mass of ethyl acetate and 0.05 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) were added to a reaction apparatus equipped with a stirrer, a reflux condenser, a sequential dropping device, and a thermometer. Next, 210 parts by mass of 2-ethylhexyl methacrylate (2EHMA) (35% by mass relative to the total structural units), 330 parts by mass of 2-ethylhexyl acrylate (2EHA) (relative to the total constituent units) were prepared in another container. 600 mass parts of a monomer mixture composed of 55% by mass of the total structural unit), 60 mass parts of 2 hydroxyethyl acrylate (2HEA) (10 mass % relative to the total structural unit), 150 mass parts of which are added to the reaction Heat in the apparatus and reflux at reflux temperature for 20 minutes. Next, under reflux temperature conditions, the remaining 450 parts by mass of the monomer mixture, 33 parts by mass of ethyl acetate and 0.03 parts by m...

Embodiment 2～ Embodiment 9、 comparative example 1～ comparative example 8

[0186] Regarding Example 2 to Example 9 and Comparative Example 1 to Comparative Example 8, as shown in Table 1 and Table 2, the composition of the (meth)acrylic polymer in the adhesive was changed. 1 Similarly, the production of (meth)acrylic polymer, the preparation of adhesive, and the preparation of test samples were carried out, and the relative dielectric constant, processability, and adhesion of the adhesive layer in the test samples were evaluated. Strength and heat and humidity whitening resistance. The results are shown in Table 1 or Table 2.

[0187] [Table 1]

[0188]

[0189] [Table 2]

[0190]

[0191] In addition, the abbreviations shown in Table 1 and Table 2 are as follows.

[0192] 2EHMA: 2-ethylhexyl methacrylate (alkyl methacrylate having a branched alkyl group having 8 carbon atoms)

[0193] 2EHA: 2-ethylhexyl acrylate (alkyl acrylate having a branched alkyl group having 8 carbon atoms)

[0194] ・iBMA: Isobutyl methacrylate (alkyl methacrylate h...

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
glass transition temperatureaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
Login to View More

Abstract

An adhesive contains a (meth)acrylic polymer which comprises 35 wt% or more of a component unit derived from alkyl methacrylate having a branched-alkyl group having 5-9 carbon atoms, based on all component units; and 0.1 wt% or more and 35 wt% or less of a component unit derived from a monomer having a hydroxyl group, based on all component units, and has the glass transition temperature of -55°C to -10°C. The purpose of an embodiment of the present invention is to provide the adhesive forming an adhesive layer having the low relative permittivity, high adhesion, and excellent processability, and to provide an adhesive sheet comprising the adhesive layer.

Description

technical field [0001] One embodiment of the present invention relates to an adhesive and an adhesive sheet. Background technique [0002] Touch panels are used in input devices of electronic equipment such as mobile phones and portable information terminals. A touch panel is generally composed of multiple parts such as a glass substrate, a transparent conductive film, and a design film. These components are laminated through an adhesive layer formed of an adhesive. [0003] With the thinning of the touch panel in recent years, the pressure-sensitive adhesive layer is also required to be thinned. However, if the thickness of the adhesive layer is reduced, the electrostatic capacitance inside the touch panel increases, which easily causes malfunction. Therefore, in recent years, even if the pressure-sensitive adhesive layer is thinned, in order not to increase the electrostatic capacitance, a pressure-sensitive adhesive layer with a low relative permittivity has been deman...

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 Patents(China)
IPC IPC(8): C09J133/08C09J133/10C09J7/10C09J7/20C09J7/30
Inventor 西田雅树中野宏人
Owner NIPPON CARBIDE KOGYO KK