Adhesive composition for touch panels, adhesive film, and touch panel

Patent metadata

Field	Value
Publication number	US-2017306196-A1
Application number	US-201515513427-A
Country	US
Kind code	A1
Filing date	Sep 23, 2015
Priority date	Sep 30, 2014
Publication date	Oct 26, 2017
Grant date	—

Abstract

Provided is an adhesive composition for touch panels, including: an acrylic resin; a first curing agent having one to three functional groups; and a second curing agent having four to six functional groups. Provided is an adhesive film including an adhesive layer, which is a cured product of the adhesive composition for touch panels. Provided is a touch panel including: a conductive plastic film which has a conductive layer formed on one side thereof; and an adhesive layer which is attached to the conductive layer and includes a cured product of the adhesive composition for touch panels.

First claim

1 . An adhesive composition for touch panels, comprising:
an acrylic resin; a first curing agent having one to three functional groups; and a second curing agent having four to six functional groups.

2 . The adhesive composition of claim 1 , wherein the adhesive composition comprises the first curing agent and the second curing agent in an amount of 0.01 part by weight to 1 part by weight based on 100 parts by weight of the acrylic resin.

3 . The adhesive composition of claim 1 , wherein the first curing agent and the second curing agent are a hexamethylene diisocyanate (HDI)-based curing agent.

4 . The adhesive composition of claim 1 , wherein a chain length of the first curing agent is longer than a chain length of the second curing agent.

5 . The adhesive composition of claim 1 , wherein the acrylic resin is formed by polymerizing a (meth)acrylic acid ester-based monomer and a hydrophilic functional group-containing monomer.

6 . The adhesive composition of claim 5 , wherein the hydrophilic functional group-containing monomer is polymerized in a content of 5 parts by weight to 30 parts by weight based on 100 parts by weight of the (meth)acrylic acid ester-based monomer.

7 . The adhesive composition of claim 5 , wherein the hydrophilic functional group-containing monomer is one or more selected from the group consisting of a hydroxyl group-containing monomer, an amino group-containing monomer, a carboxyl group-containing monomer, a sulfone group-containing monomer, a morpholine group-containing monomer, a glycidyl group-containing monomer, and a combination thereof.

8 . The adhesive composition of claim 5 , wherein the (meth)acrylic acid ester-based monomer is alkyl (meth)acrylate, and an alkyl of the alkyl(meth)acrylate is a linear or branched C1 to C14 alkyl.

9 . The adhesive composition of claim 1 , wherein the acrylic resin has a weight average molecular weight (or a number average molecular weight) of 500,000 to 2,000,000.

10 . The adhesive composition of claim 1 , further comprising:
an additive in an amount of 0.5 part by weight to 2 parts by weight based on 100 parts by weight of the acrylic resin.

11 . An adhesive film comprising an adhesive layer, which is a cured product of the adhesive composition for touch panels according to claim 1 .

12 . The adhesive film of claim 11 , wherein the adhesive layer has a thickness of 10 μm to 50 μm.

13 . The adhesive film of claim 11 , wherein the cured product has a gel content of 60% to 90%.

14 . A touch panel comprising:
a conductive plastic film which has a conductive layer formed on one side thereof; and an adhesive layer which is attached to the conductive layer and comprises a cured product of the adhesive composition for touch panels according to claim 1 .

15 . The touch panel of claim 14 , wherein the conductive plastic film is a polyethylene terephthalate film having an ITO (conductive metal oxide) layer formed on one side thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Sle
• Yoon Hu-Young
• Yoon Chan-Oh
• Kim Jang-Soon

Classifications

• C08G18/79

  characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates · CPC title

• C09J2203/318

  for the production of liquid crystal displays · CPC title

• C08G18/6229

  Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols · CPC title

• C09J2467/006

  in the substrate · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title