ADHESIVE FILM AND DISPLAY MEMBER COMPRISING THE SAME
Disclosed are an adhesive film and a display member including the same. The adhesive film includes a matrix including a (meth)acrylic copolymer containing hydroxyl group and nanoparticles dispersed in the matrix, wherein a difference in cohesive energy between the matrix and the nanoparticles is about 20,000 J/mol or less.
1 . An adhesive film comprising:
a matrix comprising a (meth)acrylic copolymer containing hydroxyl group; and
nanoparticles dispersed in the matrix,
wherein the adhesive film has a haze of about 1% or less, as measured after the adhesive film has been left under conditions of 25° C. and 80% RH for 8 hours, and a warpage value of about 0.15 mm or less after the adhesive film has been left under conditions of 60° C. and 90% RH for 500 hours.
2 . The adhesive film according to claim 1 , wherein a difference in cohesive energy between the matrix and the nanoparticles is about 20,000 J/mol or less.
3 . The adhesive film according to claim 1 , wherein the nanoparticles are organic particles.
4 . The adhesive film according to claim 3 , wherein the organic particles comprise a (meth)acrylate having a glass transition temperature Tg of about 70° C. or more.
5 . The adhesive film according to claim 3 , wherein the organic particles have a core-shell structure, a shell of the core-shell structure comprising a (meth)acrylate having a glass transition temperature Tg of about 70° C. or more.
6 . The adhesive film according to claim 4 , wherein the (meth)acrylate having a glass transition temperature Tg of about 70° C. or more comprises at least one of polymethyl methacrylate (PMMA) and isobornyl acrylate (IBOA).
7 . The adhesive film according to claim 1 , wherein the nanoparticles have an average particle diameter of about 5 nm to about 1,000 nm.
8 . The adhesive film according to claim 1 , wherein the nanoparticles are present in an amount of about 0.01 parts by weight to about 20 parts by weight based on 100 parts by weight of a monomer mixture forming the (meth)acrylic copolymer containing hydroxyl group.
9 . The adhesive film according to claim 1 , wherein the (meth)acrylic copolymer containing hydroxyl group is a copolymer of a monomer mixture comprising a (meth)acrylic monomer containing hydroxyl group and a monomer, a homopolymer of which has a glass transition temperature Tg of about −150° C. to about 0° C.
10 . The adhesive film according to claim 9 , wherein the monomer mixture further comprises a monomer containing carboxyl acid group.
11 . The adhesive film according to claim 9 , wherein the (meth)acrylic monomer containing hydroxyl group is present in an amount of about 5 wt % to about 35 wt % in the monomer mixture.
12 . The adhesive film according to claim 1 , wherein the adhesive film is formed of an adhesive composition comprising the (meth)acrylic copolymer containing hydroxyl group and the nanoparticles.
13 . The adhesive film according to claim 12 , wherein the adhesive composition further comprises at least one of an initiator, a crosslinking agent and a silane coupling agent.
14 . The adhesive film according to claim 1 , wherein the adhesive film has an adhesive strength of about 800 gf/in to about 1,500 gf/in, as measured on a 100 μm thick specimen at 25° C.
15 . The adhesive film according to claim 1 , wherein the adhesive film has an adhesive strength of about 500 gf/in to about 1,200 gf/in, as measured on a 100 μm thick specimen at 60° C.
16 . The adhesive film according to claim 1 , wherein the adhesive film has a haze of about 1% or less, as measured on a 100 μm thick specimen after being left at 25° C. and 80% RH for 8 hours.
17 . The adhesive film according to claim 1 , wherein the adhesive film has a haze of about 5% or less, as measured on a 100 μm thick specimen after stretching to 200% an initial length thereof.
18 . 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.
19 . The display member according to claim 18 , wherein the optical film comprises touch panels, windows, polarizing plates, color filters, retardation films, elliptical polarizing films, reflective films, anti-reflective films, compensation films, brightness improving films, alignment films, light diffusion films, surface protective films, OLED device barrier layers, plastic LCD substrates, indium tin oxide (ITO)-containing films, fluorinated tin oxide (FTO)-containing films, aluminum-doped zinc oxide (AZO)-containing films, carbon nanotube (CNT)-containing films, Ag nanowire-containing films, or graphene.