Adhesive film and display member comprising the same

Patent metadata

Field	Value
Publication number	US-11999879-B2
Application number	US-202017068155-A
Country	US
Kind code	B2
Filing date	Oct 12, 2020
Priority date	Jun 30, 2015
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

An adhesive film and a display member including the same are disclosed. The adhesive film is formed of an adhesive composition including: a copolymer of a monomer mixture including a hydroxyl group-containing (meth)acrylate and a comonomer; and nanoparticles. The adhesive film has a creep at −20° C. of about 50 μm to about 100 μm and a gel fraction of about 50% to about 75%.

First claim

What is claimed is:

1. An adhesive film formed of a cured adhesive composition comprising: a copolymer of a monomer mixture comprising a hydroxyl group-containing (meth)acrylate and a comonomer; and nanoparticles, wherein the adhesive film has a creep at −20° C. of about 50 μm to about 100 μm and a storage modulus at −20° C. of about 30 kPa to about 100 kPa, wherein the nanoparticles have an average particle diameter of about 5 nm to about 400 nm, and
wherein the nanoparticles are present in an amount of about 0.1 parts by weight to about 10 parts by weight relative to 100 parts by weight of the monomer mixture,.
wherein the hydroxyl group-containing (meth)acrylate is a C 1 to C 20 alkyl group-containing (meth)acrylic acid ester having at least one hydroxyl group, a C 5 to C 20 cycloalkyl group-containing (meth)acrylic acid ester having at least one hydroxyl group, or a C 6 to C 20 aryl group-containing (meth)acrylic acid ester having at least one hydroxyl group, and
the comonomer includes at least one of alkyl (meth)acrylate monomers, ethylene oxide-containing monomers, propylene oxide-containing monomers, amine group-containing monomers, amide group-containing monomers, alkoxy group-containing monomers, phosphoric acid group-containing monomers, sulfonic acid group-containing monomers, phenyl group-containing monomers, or silane group-containing monomers.

2. The adhesive film according to claim 1 , wherein the hydroxyl group- containing (meth)acrylate is present in an amount of about 10 wt % to about 40 wt % in the monomer mixture.

3. The adhesive film according to claim 1 , wherein the adhesive film has a creep of about 60 μm to about 350 μm at 25° C.

4. The adhesive film according to claim 1 ,
wherein the adhesive film has a T-peel strength of about 400 gf/in to about 4,000 gf/in with respect to a corona-treated PET film at 25° C., and
wherein the adhesive film has a T-peel strength of about 200 gf/in to about 3,000 gf/in with respect to a corona-treated PET film at 60° C.

5. The adhesive film according to claim 1 ,
wherein the adhesive film has a storage modulus of about 10 kPa to about 100 kPa at 25° C., and
wherein the adhesive film has a storage modulus of about 10 kPa to about 100 kPa at 80° C.

6. The adhesive film according to claim 1 , wherein the adhesive film has a ratio of storage modulus at −20° C. to storage modulus at 25° C. of about 1:1 to 4:1.

7. The adhesive film according to claim 1 , wherein the adhesive film has a difference of about 55 kPa or less between storage modulus at −20° C. and storage modulus at 80° C.

8. The adhesive film according to claim 1 , wherein the adhesive film has a glass transition temperature (Tg) of about −35° C. to about −60° C.

9. The adhesive film according to claim 1 , wherein the adhesive film has a haze of about 5% or less at a thickness of 100 μm.

10. A display member comprising:
an optical film; and
the adhesive film according to claim 1 attached to one or both surfaces of the optical film.

11. The adhesive film according to claim 1 , wherein
the hydroxyl group-containing (meth)acrylate includes at least one of 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, and 6-hydroxyhexyl (meth)acrylate; and
the comonomer includes at least one of alkyl (meth)acrylate monomers including methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, iso-butyl acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl acrylate, dodecyl (meth)acrylate, polyethylene oxide monomethyl ether (meth)acrylate, polyethylene oxide monoethyl ether (meth)acrylate, polyethylene oxide monopropyl ether (meth)acrylate, polyethylene oxide monobutyl ether (meth)acrylate, polyethylene oxide monopentyl ether (meth)acrylate, polypropylene oxide monomethyl ether (meth)acrylate, polypropylene oxide monoethyl ether (meth)acrylate, polypropylene oxide monopropyl ether (meth)acrylate, monomethylaminoethyl (meth)acrylate, monoethylaminoethyl (meth)acrylate, monomethylaminopropyl (meth)acrylate, monoethylaminopropyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-methoxypropyl (meth)acrylate, 2-ethoxypropyl (meth)acrylate, 2-acetoacetoxyethyl (meth)acrylate, vinyltrimethoxysilane, or vinyltriethoxysilane.

Assignees

• Samsung Sdi Co Ltd
• Samsung Electronics Co Ltd

Inventors

• Cho Ik Hwan
• Kim Ji Ho
• Kim Jee Hee
• Kang Ji Won
• Kwak Byeong Do
• Kim Yong Tae
• Kim Il Jin
• Mun Sung Hyun
• Moon Hyung Rang
• Shin Seon Hee
• Lee Gwang Hwan
• Lee Woo Jin
• Han Jae Hyun

Classifications

• C09J133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J7/10

  without carriers · CPC title

• C09J2203/318

  for the production of liquid crystal displays · CPC title

• C09J2301/312

  parameters being the characterizing feature · CPC title

• C09J2301/408

  additives as essential feature of the adhesive layer · CPC title