OPTICAL LAMINATE
The present application relates to an optical laminate. The present application can provide an optical laminate having excellent surface properties such as scratch resistance or hardness, which comprises, for example, a cover layer capable of replacing a so-called cover glass.
1 . An optical laminate, comprising:
an optical functional layer; and
a cover layer formed on top of the optical functional layer,
wherein the cover layer comprises at least one hard coat layer and a glass layer comprising a silica network formed of one or more units selected from the group consisting of units of the following formulae A and B:
R n SiO (4-n)/2 [Formula A]
SiO 3/2 L 1/2 [Formula B]
wherein, R is hydrogen, an alkyl group, an alkenyl group, an aryl group, an arylalkyl group, an epoxy group or a (meth)acryloyloxyalkyl group, n is 0 or 1, and L is a divalent linking group comprising any one selected from the group consisting of an alkylene group and an arylene group, or comprising a combination of an alkylene group and an arylene group.
2 . The optical laminate according to claim 1 , wherein the cover layer has a 500 g steel wool resistance of at least 5,000 times.
3 . The optical laminate according to claim 1 , wherein the cover layer has a pencil hardness of at least 5 H as measured by a method of drawing a pencil lead on a surface of the cover layer at a load of 500 g and an angle of 45 degrees at a temperature of 25° C. and 50% relative humidity.
4 . The optical laminate according to claim 1 , wherein the cover layer has a maximum holding curvature radius in a range of 1 to 40 pi as measured by the Mandrel flexure evaluation method according to ASTM D522 standard.
5 . The optical laminate according to claim 1 , wherein the glass layer further comprises a nitrogen atom and does not contain a linkage (Si—N) of the nitrogen atom and theft silicon atom.
6 . The optical laminate according to claim 5 , wherein the nitrogen atom is contained in or derived from an amine compound having a pKa of 8 or less.
7 . The optical laminate according to claim 5 , wherein the nitrogen atom is contained in or derived from an amine compound having a boiling point in a range of 80° C. to 500° C.
8 . The optical laminate according to claim 5 , wherein the nitrogen atom is contained in or derived from an amine compound having a room temperature vapor pressure of 10,000 Pa or less.
9 . The optical laminate according to claim 5 , wherein the nitrogen atom is contained in or derived from a compound represented by the following formula 5; an ionic compound having a cationic compound represented by any one of the following formulae 7 to 9 or a compound of the following formula 10:
wherein, R 9 is hydrogen, an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 12 carbon atoms, R 11 and R 12 are each independently hydrogen or an alkyl group having 1 to 4 carbon atoms, and R 10 is hydrogen, an alkyl group having 1 to 4 carbon atoms, an arylalkyl group having 7 to 16 carbon atoms or a substituent of the following formula 6:
wherein, L 1 is an alkylene group having 1 to 4 carbon atoms:
wherein, R 13 to R 20 are each independently hydrogen or an alkyl group having 1 to 20 carbon atoms:
wherein, R 21 to R 24 are each independently hydrogen or an alkyl group having 1 to 20 carbon atoms:
wherein, R 25 to R 30 are each independently hydrogen or an alkyl group having 1 to 20 carbon atoms:
wherein, L 6 is an alkylene group having 1 to 20 carbon atoms or an alkylidene group having 1 to 20 carbon atoms.
10 . The optical laminate according to claim 5 , wherein the glass layer contains the nitrogen atom in an amount of 0.0001 to 6 weight %.
11 . The optical laminate according to claim 1 , wherein the optical functional layer is a polarizing layer or a retardation layer.
12 . The optical laminate according to claim 1 , wherein the cover layer further comprises a base film, and wherein the hard coat layer comprises an upper hard coat layer formed on the upper surface of the base film and a lower hard coat layer formed on the lower surface of the base film.
13 . The optical laminate according to claim 12 , wherein the glass layer is formed on top of the upper hard coat layer.
14 . The optical laminate according to claim 1 , wherein the cover layer further comprises first and second base films.
15 . The optical laminate according to claim 14 , wherein the hard coat layer comprises first upper and first lower hard coat layers formed on upper and lower sides of the first base film, respectively, and second upper and second lower hard coat layers formed on upper and lower sides of the second base film, respectively.
16 . The optical laminate according to claim 15 , wherein the glass layer is formed on top of the first or second upper hard coat layer.
17 . A display device comprising the optical laminate of claim 1 .