Adhesive composition for touch screen panel, optical adhesive film and touch screen panel

Patent metadata

Field	Value
Publication number	US-10259977-B2
Application number	US-201515510855-A
Country	US
Kind code	B2
Filing date	Sep 16, 2015
Priority date	Sep 16, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

Provided is an adhesive composition including: a (meth)acrylic acid ester-based photo-curable resin; and an oxygen-free di-functional diene-based rubber hardener.

First claim

The invention claimed is:

1. An adhesive composition comprising:
a (meth)acrylic acid ester-based photo-curable resin; and
an oxygen-free di-functional diene-based rubber hardener.

2. The adhesive composition of claim 1 , wherein the oxygen-free di-functional diene-based rubber hardener comprises a diene-based di-functional group at both ends thereof.

3. The adhesive composition of claim 1 , wherein the oxygen-free di-functional diene-based rubber hardener comprises one selected from the group consisting of a di-functional polybutadiene, a di-functional isoprene rubber, a di-functional isobutylene-isoprene rubber, a di-functional styrene-butylene rubber, and a combination thereof.

4. The adhesive composition of claim 1 , wherein the oxygen-free di-functional diene-based rubber hardener has a weight average molecular weight from 3,000 to 20,000.

5. The adhesive composition of claim 1 , wherein the oxygen-free di-functional diene-based rubber hardener has a dielectric constant k value from 2.1 to 2.5 measured at a frequency of 100 kHz.

6. The adhesive composition of claim 1 , wherein the adhesive composition comprises:
100 parts by weight of the (meth)acrylic acid ester-based photo-curable resin; and
0.1 to 2 parts by weight of the oxygen-free di-functional diene-based rubber hardener.

7. The adhesive composition of claim 1 , wherein the (meth)acrylic acid ester-based photo-curable resin is a resin in which a (meth)acrylic acid ester monomer and a crosslinkable monomer comprising at least one selected from the group consisting of a hydroxy group-containing monomer, a carboxyl group-containing monomer, or a nitrogen-containing monomer, and a combination thereof are copolymerized with each other.

8. The adhesive composition of claim 7 , wherein the (meth)acrylic acid ester 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 7 , wherein the (meth)acrylic acid ester monomer comprises one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, pentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isobornyl (meth)acrylate, isononyl (meth)acrylate, and a combination thereof.

10. The adhesive composition of claim 7 , wherein the crosslinkable monomer comprises one selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 2-hydroxyethylene glycol (meth)acrylate, 2-hydroxypropylene glycol (meth)acrylate, acrylic acid, methacrylic acid, 2-(meth)acryloyloxy acetic acid, 3-(meth)acryloyloxy propyl acid, 4-(meth)acryloyloxy butyric acid, acrylic acid dimer, itaconic acid, maleic acid, 2-isocyanatoethyl (meth)acrylate, 3-isocyanatopropyl (meth)acrylate, 4-isocyanatobutyl (meth)acrylate, (meth)acrylamide, N-vinyl pyrrolidone, N-vinyl caprolactam, and a combination thereof.

11. The adhesive composition of claim 1 , further comprising:
a photoinitiator.

12. The adhesive composition of claim 11 , wherein the photoinitiator comprises one selected from the group consisting of a benzoin-based initiator, a hydroxy ketone-based initiator, an amino ketone-based initiator, caprolactam, and a combination thereof.

13. An optical adhesive film comprising:
an adhesive layer which comprises photo-cured products of the adhesive composition according to claim 1 .

14. A touch screen panel comprising:
a conductive plastic film layer having a conductive layer formed on one surface thereof;
the optical adhesive film according to claim 13 laminated on an upper portion of the conductive layer; and
a cover window layer laminated on an upper portion of the optical adhesive film.

15. The touch screen panel of claim 14 , wherein the conductive plastic film layer is a polyethylene terephthalate film having a conductive metal oxide layer formed on one surface thereof.

16. The touch screen panel of claim 14 , wherein the cover window layer is a transparent plastic film replacing glass or tempered glass.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Won-Ho
• Lee Sle
• Yoon Chan-Oh
• Kim Jang-Soon
• Park Eun-Kyung
• Jung Bu-Gi
• Kim Min-Jeong
• Kim Sang-Hwan

Classifications

• C09J7/22

  Plastics; Metallised plastics · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• C09J11/08 Primary

  Macromolecular additives · CPC title

• C09J2467/006

  in the substrate · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title