Adhesive film and display member comprising the same
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%.
1. An adhesive film formed of an adhesive composition comprising: a copolymer of a monomer mixture comprising a hydroxyl group-containing (meth)acrylate and a comonomer; and nanoparticles, wherein the hydroxyl group-containing (meth)acrylate is present in an amount of 15 wt % to 30 wt % in the monomer mixture, wherein the adhesive film has a creep at −20° C. of about 50 μm to about 100μm and a gel fraction of about 50% to about 75%, wherein a difference in index of refraction between the nanoparticles and the copolymer is about 0.03 or less, wherein the nanoparticles form a chemical bond with the copolymer, and wherein the adhesive film has a storage modulus of about 10 kPa to about 100 kPa at 80° C.
2. The adhesive film according to claim 1 , wherein the hydroxyl group-containing (meth)acrylate is present in an amount of 15 wt% to 25 wt% in the monomer mixture.
3. The adhesive film according to claim 1 ,
wherein the nanoparticles have an average particle diameter of about 10 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.