Composition for window film, flexible window film formed therefrom, and flexible display device comprising same
Provided are a composition for a window film, a flexible window film formed therefrom, and a flexible display device comprising same, the composition for a window film comprising: a first silicone resin comprising chemical formula 1; a second silicone resin containing a crosslinkable functional group and one or more among 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 ] n ) y (R 4 R 5 SiO 2/2 ) z (R 6 R 7 R 8 SiO 1/2 ) w (where R 1 is a crosslinkable functional group; R 2 and R 3 are each independently a methyl group; R4 and R5 are each independently hydrogen, a crosslinkable functional group, an unsubstituted or substituted C1-C20 alkyl group, or an unsubstituted or substituted C5-C20 cycloalkyl group; R6, R7, and R8 are each independently hydrogen, a crosslinkable functional group, an unsubstituted or substituted C1-C20 alkyl group, an unsubstituted or substituted C5-C20 cycloalkyl group, or an unsubstituted or substituted C6-C30 aryl group; n is an integer from 7 to 100; 0<x<1, 0.01≤y≤0.6, 0≤z<1, 0≤w<1, and x+y+z+w=1.
1. A composition for window films, comprising: a first silicone resin represented by Formula 1; a second silicone resin containing 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 ] n ) y (R 4 R 5 SiO 2/2 ) z (R 6 R 7 R 8 SiO 1/2 ) w <Formula 1>
where R 1 is a crosslinkable functional group;
R 2 and R 3 are each independently a methyl group;
R 4 and R 5 are each independently hydrogen, a crosslinkable functional group, an unsubstituted or substituted C 1 to C 20 alkyl group, or an unsubstituted or substituted C 5 to C 20 cycloalkyl group;
R 6 , R 7 and R 8 are each independently hydrogen, a crosslinkable 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 30 aryl group;
n is an integer of 7 to 100; and
0<x<1, 0.01≤0.6, 0≤z<1, 0≤w≤0.05, and x+y+z+w=1.
2. The composition for window films according to claim 1 , wherein the first silicone resin is represented by at least one of compounds represented by Formula 1-1A to Formula 1-1C:
(EcSiO 3/2 ) x ([(Me) 2 SiO 2/2 ] n ) y <Formula 1-1A>
(GpSiO 3/2 ) x ([(Me) 2 SiO 2/2 ] n ) y <Formula 1-1B>
(OpSiO 3/2 ) x ([(Me) 2 SiO 2/2 ] n ) y <Formula 1-1C>
where in Formula 1-1A to Formula 1-1C, Ec is an epoxycyclohexylethyl group, Gp is a glycidoxypropyl group, Op is an oxetanylpropyl group, Me is a methyl group, n is the same as defined in Formula 1, 0.4≤x≤0.99, 0.010.6, and x+y=1.
3. The composition for window films according to claim 1 , wherein the first silicone resin is present in an amount of about 30 wt % to about 99 wt % in the composition for window films in terms of solid content.
4. A composition for window films, comprising: a first silicone resin represented by Formula 1; a second silicone resin containing 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 ] n ) y (R 4 R 5 SiO 2/2 ) z (R 6 R 7 R 8 SiO 1/2 ) w <Formula 1>
where R 1 is a crosslinkable functional group;
R 2 and R 3 are each independently a methyl group;
R 4 and R 5 are each independently hydrogen, a crosslinkable functional group, an unsubstituted or substituted C 1 to C 20 alkyl group, or an unsubstituted or substituted C 5 to C 20 cycloalkyl group;
R 6 , R 7 and R 8 are each independently hydrogen, a crosslinkable 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 30 aryl group;
n is an integer of 7 to 100; and
0<x<1, 0.01≤y≤0.6, 0≤z<1, 0≤w<1, and x+y+z+w=1,
wherein the second silicone resin comprises at least one of compounds represented by Formula 5 and Formula 6:
where in Formula 5, * is a linking site of an element;
R 14 , R 15 , R 16 , R 17 , R 18 and R 19 are each independently a crosslinkable functional group, or a substituted or unsubstituted C 1 to C 10 alkyl group; and
n is an integer of 10 to 200,
where in Formula 6, * is a linking site of an element;
R 20 is a substituted or unsubstituted C 1 to C 20 alkylene group, a substituted or unsubstituted C 2 to C 20 alkenylene group, a substituted or unsubstituted C 2 to C 20 alkynylene group, a substituted or unsubstituted C 6 to C 20 arylene group, a substituted or unsubstituted C 7 to C 30 arylalkylene group, or a substituted or unsubstituted C 3 to C 20 cycloalkylene group;
R 14 , R 15 , R 16 , R 17 , R 18 and R 19 are the same as defined in Formula 5; and
n is an integer of 15 to 120.
5. A composition for window films, comprising: a first silicone resin represented by Formula 1; a second silicone resin containing 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 ] n ) y (R 4 R 5 SiO 2/2 ) z (R 6 R 7 R 8 SiO 1/2 ) w <Formula 1>
where R 1 is a crosslinkable functional group;
R 2 and R 3 are each independently a methyl group;
R 4 and R 5 are each independently hydrogen, a crosslinkable functional group, an unsubstituted or substituted C 1 to C 20 alkyl group, or an unsubstituted or substituted C 5 to C 20 cycloalkyl group;
R 6 , R 7 and R 8 are each independently hydrogen, a crosslinkable 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 30 aryl group;
n is an integer of 7 to 100; and
0<x<1, 0.01≤y≤0.6, 0≤z<1, 0≤w<1, and x+y+z+w=1,
wherein the second silicone resin comprises at least one of compounds represented by Formula 5-1, Formula 5-2, Formula 6-1, and Formula 6-2:
where in Formula 5-1 and Formula 5-2, * is a linking site of an element and n is an integer of 10 to 200,
where in Formula 6-1 and Formula 6-2, * is a linking site of an element and n is an integer of 15 to 120.
6. The composition for window films according to claim 1 , wherein the second silicone resin is present in an amount of about 0.1 wt % to about 50 wt % in the composition for window films in terms of solid content.
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 layer formed on an other surface of the base layer opposite to the one surface.
9. A flexible display device comprising the flexible window film according to claim 7 .
10. The flexible display device 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 device 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 device 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 device according to claim 12 , further comprising: a polarizing plate disposed at an upper or lower side of the display part.