Glass substrate multilayer structure, a method for manufacturing the same, and a display panel including the same
Provided are a glass substrate protective film including an optically transparent adhesive layer; a polyimide-based shatter-proof layer formed on the optically transparent adhesive layer; and a hard coating layer formed on the polyimide-based shatter-proof layer. The hard coating layer and the optically transparent adhesive layer have a thickness of 5 to 20 μm, the polyimide-based shatter-proof layer has a thickness of 20 to 50 μm, the glass substrate protective film has an absolute value of a retardation in a thickness direction (R th ) of 2000 nm or less, and an adhesive strength when the optically transparent adhesive layer adheres to the glass substrate is 200 gf/in or more. A method for manufacturing the glass substrate laminate and a display panel including the glass substrate laminate are also provided.
1. A protective film for glass substrate protective film comprising:
an optically transparent adhesive layer;
a polyimide-based shatter-proof layer formed on the optically transparent adhesive layer; and
a hard coating layer formed on the polyimide-based shatter-proof layer,
wherein the hard coating layer and the optically transparent adhesive layer have a thickness of 5 to 20 μm, respectively, the polyimide-based shatter-proof layer has a thickness of 20 to 50 μm,
wherein the polyimide-based shatter-proof layer includes a polyimide polymer including a unit derived from an aromatic diamine containing fluorine atom, and an aromatic dianhydride,
wherein the aromatic dianhydride comprises BPAF (9,9-bis(3,4-dicarboxyphenyl) fluorene dianhydride), and
wherein the hard coating layer includes a unit derived from a condensate of alkoxysilane having an epoxy group.
2. The protective film for glass substrate of claim 1 , wherein the condensate of alkoxysilane having an epoxy group is a silsesquioxane resin having an epoxy group.
3. The protective film for glass substrate protective-film of claim 1 , wherein the hard coating layer further includes a unit derived from a crosslinking agent having a polyfunctional epoxy group.
4. A glass substrate laminate comprising:
a glass substrate; and
the protective film for glass substrate of claim 1 on one surface of the glass substrate
wherein the glass substrate laminate has an absolute value of a retardation in a thickness direction (Rth) of 2000 nm or less, and an adhesive strength between the glass substrate and the optically transparent adhesive layer is 200 gf/in or more.
5. The glass substrate laminate of claim 4 , wherein the glass substrate has a thickness of 100 to 1000 μm.
6. The glass substrate laminate of claim 4 , wherein the glass substrate laminate has a flame retardant grade of V-0 as evaluated in accordance with a UL-94 VB flame retardant specification.
7. The glass substrate laminate of claim 4 , wherein the glass substrate laminate has a pencil hardness in accordance with ASTM D3363 of 4H or more.
8. A method for manufacturing a glass substrate laminate, the method comprising:
applying a hard coating layer forming composition on one surface of a polyimide-based shatter-proof layer and curing the composition to form a hard coating layer;
attaching an optically transparent adhesive layer to the other surface of the polyimide-based shatter-proof layer; and
laminating a glass substrate on the optically transparent adhesive layer,
wherein the hard coating layer and the optically transparent adhesive layer have a thickness of 5 to 20 μm, respectively, the polyimide-based shatter-proof layer has a thickness of 20 to 50 μm, the glass substrate laminate has an absolute value of a retardation in a thickness direction (R th ) of 2000 nm or less, and an adhesive strength between the glass substrate and the optically transparent adhesive layer is 200 gf/in or more,
wherein the polyimide-based shatter-proof layer includes a polyimide polymer including a unit derived from an aromatic diamine containing fluorine atom, and an aromatic dianhydride,
wherein the aromatic dianhydride comprises BPAF (9,9-bis(3,4-dicarboxyphenyl) fluorene dianhydride), and
wherein the hard coating layer includes a unit derived from a condensate of alkoxysilane having an epoxy group.
9. The method for manufacturing a glass substrate laminate of claim 8 , wherein the condensate of alkoxysilane having an epoxy group is a silsesquioxane resin having an epoxy group.
10. The method for manufacturing a glass substrate laminate of claim 8 , wherein the hard coating layer forming composition further includes a crosslinking agent having a polyfunctional epoxy group.
11. The method for manufacturing a glass substrate laminate of claim 8 , wherein the glass substrate laminate has a flame retardant grade of V-0 as evaluated in accordance with a UL-94 VB flame retardant specification.
12. The method for manufacturing a glass substrate laminate of claim 8 , wherein the glass substrate laminate has a pencil hardness in accordance with ASTM D3363 of 4H or more.
13. A display panel comprising the glass substrate protective film of claim 1 .