COMPOSITION FOR WINDOW FILM, FLEXIBLE WINDOW FILM FORMED THEREFROM, AND FLEXIBLE DISPLAY DEVICE COMPRISING SAME
Provided is a composition for window films comprising a siloxane resin of formula 1, a crosslinking agent and an initiator, a flexible window film formed therefrom, and a flexible display device comprising the same. (R 1 SiO 3/2 ) x (R 2 SiO 3/2 ) y (R 3 R 4 SiO 2/2 ) z (SiO 4/2 )w (in formula 1, R 1 is a functional group containing an alicyclic epoxy group, R 2 is a functional group containing a glycidyl group, R 3 and R 4 are each independently a hydrogen, a functional group containing an alicyclic epoxy group, a functional group containing a glycidyl group, an optionally substituted C 1 to C 20 alkyl group, an optionally substituted C 5 to C 20 cycloalkyl group or an optionally substituted C 6 to C 20 aryl group, wherein 0<x<1, 0<y≤0.5, 0≤z<1, 0≤w<1, and x+y+z+w=1).
1 . A composition for window films, comprising:
a siloxane resin represented by Formula 1; a crosslinking agent; and an initiator.
(R 1 SiO 3/2 ) x (R 2 SiO 3/2 ) y (R 3 R 4 SiO 2/2 ) z (SiO 4/2 ) w <Formula 1>
(wherein Formula 1, R 1 is an alicyclic epoxy group-containing functional group, R 2 is a glycidyl group-containing functional group, R 3 and R 4 are each independently hydrogen, an alicyclic epoxy group-containing functional group, a glycidyl group-containing functional group, an unsubstituted or substituted C 1 to C 20 alkyl group, an unsubstituted or substituted C 5 to C 20 cycloalkyl group, or an unsubstituted or substituted C 6 to C 20 aryl group, 0<x<1, 0<y≤0.5, 0≤z<1, 0≤w<1, and x+y+z+w=1.)
2 . The composition for window films according to claim 1 , wherein y is in the range of 0.01≤y≤0.15.
3 . The composition for window films according to claim 1 , wherein the siloxane resin represented by Formula 1 comprises a siloxane resin represented by (EcSiO 3/2 ) x (GpSiO 3/2 ) y (where Ec is a 2-(3,4-epoxycyclohexyl)ethyl group, Gp is a 3-glycidoxypropyl group, 0.5≤x<1, 0<y≤0.5, and x+y=1).
4 . The composition for window films according to claim 1 , wherein the crosslinking agent comprises at least one of a non-cyclic aliphatic epoxy monomer, a cyclic aliphatic epoxy monomer, a hydrogenated aromatic hydrocarbon epoxy monomer, and an oxetane monomer.
5 . The composition for window films according to claim 1 , wherein the composition has an index of refraction of about 1.4 to about 1.6.
6 . A flexible window film comprising:
a base layer; and
a coating layer formed on the base layer,
wherein the coating layer is formed of the composition for window films according to claim 1 .
7 . The flexible window film according to claim 6 , further comprising: an adhesive layer formed on the other surface of the base layer.
8 . The flexible window film according to claim 6 , wherein the flexible window film has a radius of curvature of about 5.0 mm or less.
9 . A flexible display comprising the flexible window film according to claim 6 .
10 . The flexible display according to claim 9 , comprising: a display part; an adhesive layer formed on the display part; a polarizing plate formed on the adhesive layer; a touchscreen panel formed on the polarizing plate; and the flexible window film formed on the touchscreen panel.
11 . The flexible display according to claim 9 , comprising: a display part; a touchscreen panel formed on the display part; a polarizing plate formed on the touchscreen panel; and the flexible window film formed on the polarizing plate.
12 . The flexible display according to claim 9 , comprising: a display part; an adhesive layer formed on the display part; and the flexible window film formed on the adhesive layer.
13 . The flexible display according to claim 12 , wherein the display part further comprises a polarizing plate formed on an upper surface or lower surface thereof.