Composition for making hard coating layer
View Patent ↗The present invention relates to a composition for forming a hard coating layer, which may form a hard coating layer having significantly improved hardness as well as excellent flexibility such that curling is minimized.
1. A composition for forming a hard coating layer, comprising:
a first silsesquioxane resin and a second silsesquioxane resin, which have a weight average molecular weight of 500 or more but less than 30,000 and are substituted with a substituent of a (meth)acrylate group, a vinyl group or an epoxy group, the substituent having an equivalent ratio of 50% or more,
wherein a hydrodynamic radius ratio of the first silsesquioxane resin to the second silsesquioxane resin is from 1.01 to 2.90, and wherein the first and second silsesquioxane resins are included at a weight ratio in a range of from 1:9 to 9:1, and
wherein the first and second silsesquioxane resins are selected from the group consisting of complete-cage type resins, incomplete-cage type resins, ladder type resins, random type resins and mixtures thereof, provided that the first and second silsesquioxane resins are not both complete-cage type resins.
2. The composition of claim 1 , wherein the hydrodynamic radius ratio of the first silsesquioxane resin to the second silsesquioxane resin is from 1.01 to 2.00.
3. The composition of claim 1 , wherein the equivalent ratio of the substituent of the first silsesquioxane resin and second silsesquioxane resin is 80% or more, and the hydrodynamic radius ratio of the first silsesquioxane resin to the second silsesquioxane resin is from 1.01 to 1.50.
4. The composition of claim 1 , wherein the first silsesquioxane resin and the second silsesquioxane resin are included at a weight ratio in a range of 3:7 to 7:3.
5. The composition of claim 1 , wherein a total content of the first silsesquioxane resin and the second silsesquioxane resin is 10 to 90 wt % based on a total weight of the composition.
6. The composition of claim 1 , further comprising an oligomer having a functional group which is crosslinkable with the first silsesquioxane resin and the second silsesquioxane resin.
7. The composition of claim 6 , wherein the oligomer is a (meth)acrylate oligomer, a vinyl oligomer or an epoxy oligomer.
8. The composition of claim 1 , further comprising a reactive monomer having a functional group which is crosslinkable with the first silsesquioxane resin and the second silsesquioxane resin.
9. The composition of claim 8 , wherein the reactive monomer is a (meth)acrylate monomer, a vinyl monomer or an epoxy monomer.
10. The composition of claim 1 , further comprising an inorganic filler.
11. The composition of claim 1 , further comprising at least one type selected from the group consisting of a photo-radical polymerization initiator, a photo-cationic polymerization initiator and a thermal polymerization initiator.
12. A hard coating film, comprising a base material of which at least one surface has a hard coating layer formed of the composition of claim 1 .
13. The film of claim 12 , wherein the base material is made from least one resin selected from the group consisting of a polyester-based resin, a cellulose-based resin, a polycarbonate-based resin, an acrylic resin, a styrene-based resin, a polyolefin-based resin, a polyimide-based resin, a polyether sulfone-based resin and a sulfone-based resin.
14. The film of claim 12 , wherein one surface of the base material has the hard coating layer, and another surface of the base material has an anti-curl back coating layer.
15. The film of claim 14 , wherein a crack-preventing layer is further formed on the anti-curl back coating layer.
16. The film of claim 12 , wherein the hard coating film is a window cover at an outermost surface of a display panel.
17. An image display device, comprising the hard coating film of claim 16 .