Composition for window film, flexible window film formed therefrom, and flexible display device comprising same
Provided are: a composition for a window film, containing a silicone resin comprising chemical formula 1 below, a cross-linking agent, and an initiator; a window film formed therefrom; and a flexible display device comprising the same. (R1SiO 3/2 ) x (SiO 3/2 -Q-SiO 3/2 ) y (R 2 SiO 3/2 ) z (In chemical formula 1, R1 and R2 are each independently a cycloaliphatic epoxy group, a cycloaliphatic epoxy group-containing functional group, a glycidyl group, or a glycidyl group-containing functional group; Q is R3 or -A1-T-A2-; R3 is a substituted or unsubstituted C1 to C10 alkylene group, or a substituted or unsubstituted C6 to C30 arylene group; A1 and A2 are each independently a single bond, or a substituted or unsubstituted C1 to C5 alkylene group; T is a mono- or polyalkylene oxide group, or an imide group-containing functional group; and 0<x<1, 0<y<1, 0≤z<1, and x+y+z=1.
1. A composition for window films, comprising:
a silicone resin comprising a compound represented by Formula 1; a crosslinking agent; and an initiator:
(R 1 SiO 3/2 ) x (SiO 3/2 -Q-SiO 3/2 ) y (R 2 SiO 3/2 ) z <Formula 1>
wherein in Formula 1, R 1 and R 2 are each independently an alicyclic epoxy group, an alicyclic epoxy group-containing functional group, a glycidyl group, or a glycidyl group-containing functional group;
Q is -A 1 -T-A 2 -,
A 1 and A 2 being each independently a single bond or a substituted or unsubstituted C 1 to C 5 alkylene group,
T being a mono- or polyalkylene oxide group, or an imide group-containing functional group; and
0<x<1, 0<y<1, 0≤z<1, and x+y+z=1.
2. The composition for window films according to claim 1 , wherein the silicone resin is represented by at least one of Formulae 1-9 to 1-26:
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 2 -SiO 3/2 ) y <Formula 1-9>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 3 -SiO 3/2 ) y <Formula 1-10>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 4 -SiO 3/2 ) y <Formula 1-11>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 5 -SiO 3/2 ) y <Formula 1-12>
(GpSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 2 -SiO 3/2 ) y <Formula 1-13>
(GpSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 3 -SiO 3/2 ) y <Formula 1-14>
(GpSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 4 -SiO 3/2 ) y <Formula 1-15>
(GpSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 5 -SiO 3/2 ) y <Formula 1-16>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—CHCH 3 CH 2 -] 2 -[—OC 2 H 4 —]-SiO 3/2 ) y <Formula 1-17>
(GpSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—CHCH 3 CH 2 -] 2 -[—OC 2 H 4 —]-SiO 3/2 ) y <Formula 1-18>
wherein in Formulae 1-9 to 1-20, Ec is an epoxycyclohexylethyl group, Gp is a plycidoxypropyl group, 0<x<1, 0<y<1, and x+y=1,
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 2 -SiO 3/2 ) y (GpSiO 3/2 ) z <Formula 1-21>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 3 -SiO 3/2 ) y (GpSiO 3/2 ) z <Formula 1-22>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 4 -SiO 3/2 ) y (GpSiO 3/2 ) <Formula 1-23>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—C 2 H 4 -] 5 -SiO 3/2 ) y (GpSiO 3/2 ) z <Formula 1-24>
(EcSiO 3/2 ) x (SiO 3/2 —C 2 H 4 —[—O—CHCH 3 CH 2 -] 2 -[—OC 2 H 4 —]-SiO 3/2 ) y (GpSiO 3/2 ) z <Formula 1-25>
wherein in Formulae 1-21 to 1-26, Ec is an epoxycyclohexylethyl group, Gp is a glycidoxypropyl group, 0<x<1, 0<y<1, 0<z<1, and x+y+z=1.
3. The composition for window films according to claim 1 , wherein the silicone resin has a weight average molecular weight of about 1,000 to about 30,000.
4. The composition for window films according to claim 1 , wherein the crosslinking agent comprises at least one of an alicyclic epoxy carboxylate and an alicyclic epoxy (meth)acrylate.
5. The composition for window films according to claim 2 , 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.
6. The composition for window films according to claim 1 , wherein the crosslinking agent is present in an amount of about 1 part by weight to about 30 parts by weight relative to 100 parts by weight of the silicone resin.
7. A flexible window film comprising: a base layer; and a coating layer formed on one surface of the base layer,
wherein the coating layer is formed of the composition for window films according to claim 1 .
8. The flexible window film according to claim 7 , further comprising: an adhesive film formed on the other surface of the base layer.
9. The flexible window film according to claim 7 , wherein the flexible window film has a pencil hardness of about 6H or higher, a radius of curvature of about 5.0 mm or less, and ΔY.I. of about 5.0 or less.