Composition for optical film, optical film and display device comprising the same

1. A composition comprising polymer particles, a (meth)acrylate binder and a solvent,

wherein the solvent includes a solvent screened using a solvent-polymer particle interaction parameter α Pi calculated according to the following Equation 1 and a solvent-(meth)acrylate binder interaction parameter αBi calculated according to the following Equation 2,

wherein the screened solvent includes at least one selected from the group consisting of diisopropyl ether, 2-methyl-2-butanol, diethylmethylamine, benzene, and trichloroethene,

wherein the solvent-polymer particle interaction parameter α Pi of the screened solvent is −0.50 to 0.50, and

wherein the solvent-(meth)acrylate binder interaction parameter αBi of the screened solvent is −0.10 to 0.20,

α

Pi

≡

∑

j

=

1

N

P

a

j

⁢

Δμ

ji

s

[

Equation

⁢

1

]

in the Equation 1,

N P means the number of types of polymers constituting the polymer particles,

a j means a ratio of a weight of each polymer particle to the total weight of the entire polymer particles,

Δμ ji means a mixing energy of the solvent I to the polymer particles j, and

Δμ s ji is a standardized value of the Δμ ji ,

α

Bi

≡

∑

k

=

1

N

B

a

k

⁢

Δμ

ki

s

[

Equation

⁢

2

]

in the Equation 2,

N B means the number of types of (meth)acrylate binders,

a k means a ratio of a weight of each (meth)acrylate binder to the total weight of the entire (meth)acrylate binder,

Δμ ki means a mixing energy of the solvent I to the (meth)acrylate binder k, and

Δμ s ki is a standardized value of the Δμ ki ,

wherein the mixing energy of the solvent to the polymer particles and the mixing energy of the solvent to the (meth)acrylate binder are values calculated using the COSMO-RS theory.

2. The composition according to claim 1 ,

wherein Δμ s ji is represented by the following Equation 1-1, and Δμ s ki is represented by the following Equation 2-1:

Δμ s ji =(Δμ ji −M j )/σ j   [Equation 1-1]

in the Equation 1-1,

Δμ ji means the mixing energy of the solvent I to the polymer particles j,

M j means an average of the Δμ ji , and

σ j means a standard deviation of the Δμ ji ,

Δμ s ki =(Δμ ki −M k )/σ k   [Equation 2-1]

in the Equation 2-1,

Δμ ki means the mixing energy of the solvent I to the (meth)acrylate binder k,

M k means an average of the Δμ ki , and

σ k means a standard deviation of the Δμ ki .

3. The composition according to claim 1 ,

wherein the solvent-polymer particle interaction parameter α Pi of the screened solvent is −0.45 to 0.45, and

wherein the solvent-(meth)acrylate binder interaction parameter α Pi of the screened solvent is −0.05 to 0.15.

4. The composition according to claim 1 ,

wherein the screened solvent has a boiling point of 68.5 to 150° C.

5. The composition according to claim 1 ,

wherein the polymer particles include at least one selected from the group consisting of polyethylene (PE), polyvinylfluoride (PVF), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), polyvinylidene chloride (PVDC), polychlorotrifluoroethylene (PCTFE), polytetrafluoroethylene (PTFE), polypropylene (PP), ethylene vinyl acetate (EVA), polymethyl methacrylate (PMMA), poly(l-butene), poly(4-methylpentene), polystyrene, polyvinylpyridine, polybutadiene, polyisoprene, polychloroprene, styrene-acrylonitrile copolymer (SAN), styrene-acrylate copolymer, styrene-methacrylate copolymer, styrene-methylmethacrylate copolymer, acrylonitrile-butadiene-styrene terpolymer, ethylene-methacrylic acid copolymer, styrene-butadiene rubber, nitrile rubber, tetrafluoroethylene copolymer, polyacrylate, polymethacrylate, polyacrylamide, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl ether, polyvinylpyrrolidone, polyvinylcarbazole, polyurethane, polyacetal, polyethylene glycol, polypropylene glycol, epoxy resin, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polydihydroxymethylcyclohexyl terephthalate, cellulose ester, polycarbonate, polyamide, polyimide, and polyarylene.

6. The composition according to claim 1 ,

wherein the (meth)acrylate binder is at least one selected from the group consisting of (meth)acrylate-based monomers, (meth)acrylate-based oligomers and (co)polymers of (meth)acrylate-based monomers.

7. A method for preparing the composition of claim 1 comprising the steps of:

screening the solvent using the solvent-polymer particle interaction parameter α Pi as set forth in the Equation 1 and the solvent-(meth)acrylate binder interaction parameter α Pi as set forth in the Equation 2; and

preparing the composition including the screened solvent, the polymer particles and the (meth)acrylate binder.

8. An optical film comprising a cured product of the composition of claim 1 .

9. The optical film according to claim 8 ,

wherein the optical film has a haze variation (ΔH) according to the following Equation 3 of 0.4% or less

Δ H (%)=| Hf−Hi|   [Equation 3]

in the Equation 3,

Hf is a haze of the optical film after maintaining the optical film at a temperature of 85° C. and a humidity of 85% for 24 hours, and

Hi is an initial haze of the optical film before being subjected to a temperature of 85° C. and a humidity of 85% for 24 hours.

10. The optical film according to claim 8 ,

wherein the optical film has a thickness of 1 to 100 μm.

11. A display device comprising the optical film according to claim 8 .