Composition for window film, flexible window film formed therefrom, and flexible display device comprising same
A composition for a window film including a first silicon resin including a compound represented by Formula 1; a second silicon resin including a crosslinkable functional group and at least one of a Q unit and a bridge unit; a crosslinking agent; and an initiator, a flexible window film formed therefrom, and a flexible display device including the same are disclosed.
1. A composition for a window film comprising:
a first silicon resin comprising a compound represented by following Formula 1;
a second silicon resin comprising a crosslinkable functional group and at least one of a Q unit and a bridge unit;
a crosslinking agent; and
an initiator,
(R 1 SiO 3/2 ) x (R 2 R 3 SiO 2/2 ) y (R 4 R 5 R 6 SiO 1/2 ) z <Formula 1>
(wherein in Formula 1,
R 1 is an epoxy group, or an epoxy-group containing functional group,
R 2 and R 3 are each independently hydrogen, a crosslinkable functional group, a substituted or non-substituted C 1 to C 20 alkyl group, or a substituted or non-substituted C 5 to C 20 cycloalkyl group,
R 4 , R 5 and R 6 are each independently hydrogen, a crosslinkable functional group, a substituted or non-substituted C 1 to C 20 alkyl group, a substituted or non-substituted C 5 to C 20 cycloalkyl group, or a substituted or non-substituted C 6 to C 30 aryl group, at least one of R 4 , R 5 and R 6 is a crosslinkable functional group,
0<x≤1, 0≤y<1, 0≤z<1, and x+y+z=1).
2. The composition of claim 1 , wherein the second silicon resin comprises a compound represented by any one of following Formulae 5 and 6:
(wherein in Formula 5,
* is a connecting portion of an element,
R 12 , R 13 , R 14 , R 15 , R 16 and R 17 are each independently a crosslinkable functional group, or a substituted or non-substituted C 1 to C 10 alkyl group,
at least one of R 12 , R 13 and R 14 is a crosslinkable functional group,
at least one of R 15 , R 16 and R 17 is a crosslinkable functional group, and
n is an integer of 10 to 200),
(wherein in Formula 6,
* is a connecting portion of an element,
R 18 is a substituted or non-substituted C 1 to C 20 alkylene group, a substituted or non-substituted C 2 to C 20 alkenylene group, a substituted or non-substituted C 2 to C 20 alkynylene group, a substituted or non-substituted C 6 to C 20 arylene group, a substituted or non-substituted C 7 to C 30 arylalkylene group, or a substituted or non-substituted C 3 to C 20 cycloalkylene group,
R 12 , R 13 , R 14 , R 15 , R 16 and R 17 are as defined in Formula 5 above, and
n is an integer of 15 to 120).
3. The composition of claim 1 , wherein the second silicon resin comprises a compound represented by at least one of following Formulae 5-1, 5-2, 6-1, and 6-2:
(wherein in Formulae 5-1 and 5-2,
* is a connecting portion of an element, and
n is an integer of 10 to 200),
(wherein in Formulae 6-1 and 6-2,
* is a connecting portion of an element, and
n is an integer of 15 to 120).
4. The composition of claim 1 , wherein the second silicon resin is present in an amount of about 0.1 wt % to about 50 wt % based on a total weight of the composition for a window film, in terms of solids content.
5. The composition of claim 1 , wherein R 1 is a glycidoxy group-containing C 1 to C 20 alkyl group, or an epoxidized C 5 to C 20 cycloalkyl group-containing C 1 to C 20 alkyl group, and y and z are zero, respectively.
6. The composition of claim 1 , wherein the first silicon resin is represented by any one of following Formulae 1-2A to 1-2H,
(GpSiO 3/2 ) x (EcMeSiO 2/2 ) y <Formula 1-2A>
(GpSiO 3/2 ) x ((Me) 2 SiO 2/2 ) y <Formula 1-2B>
(GpSiO 3/2 ) x (MeEtSiO 2/2 ) y <Formula 1-2C>
(GpSiO 3/2 ) x (GpMeSiO 2/2 ) y <Formula 1-2D>
(EcSiO 3/2 ) x (EcMeSiO 2/2 ) y <Formula 1-2E>
(EcSiO 3/2 ) x ((Me) 2 SiO 2/2 ) y <Formula 1-2F>
(EcSiO 3/2 ) x (MeEtSiO 2/2 ) y <Formula 1-2G>
(EcSiO 3/2 ) x (GpMeSiO 2/2 ) y <Formula 1-2H>
(wherein in Formulae 1-2A to 1-2H,
Gp is a glycidoxypropyl group,
Ec is an epoxycyclohexylethyl group,
Me is a methyl group,
Et is an ethyl group,
0<x<1, 0<y<1, and x+y=1).
7. A flexible window film comprising:
a base layer; and
a coating layer formed on at least one surface of the base layer,
wherein the coating layer is formed from the composition for a window film according to claim 1 .
8. The film of claim 7 , further comprising an adhesive layer formed on another surface of the base layer.
9. A flexible display device comprising the flexible window film of claim 7 .
10. The device of claim 9 , wherein the flexible display device comprises:
a display unit;
an adhesive layer formed on the display unit;
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 device of claim 9 , wherein the flexible display device comprises:
a display unit;
a touchscreen panel formed on the display unit;
a polarizing plate formed on the touchscreen panel; and
the flexible window film formed on the polarizing plate.
12. The device of claim 9 , wherein the flexible display device comprises:
a display unit;
an adhesive layer formed on the display unit; and
the flexible window film formed on the adhesive layer.
13. The device of claim 9 , further comprising a polarizing plate on an upper portion or a lower portion of the display unit.