Polarizing plate
The present disclosure relates to a polarizing plate excellent durability even under high humidity conditions and more particularly, to a polarizing plate including a polarizer and a protective layer formed on at least one surface of the polarizer, wherein the protective layer is formed of a cured product of a radically curable composition including a compound represented by the following [Chemical Formula 1]; a vinyl ether compound; a carboxylic acid compound including at least one unsaturated double bond; and a radical initiator.
1. A polarizing plate comprising: a polarizer and a protective layer formed on at least one surface of the polarizer,
wherein the protective layer is formed of a cured product of a radically curable composition including a compound represented by Chemical Formula 1; a vinyl ether compound; a carboxylic acid compound including at least one unsaturated double bond; a compound having an acid value of 100 to 1,000 mgKOH/g and a radical initiator,
where R 1 is an ester group,
R 2 is a C 1-10 alkyl group having at least one hydroxy substituent or a C 4-10 cycloalkyl group having at least one hydroxy substituent, and
R 3 is hydrogen or methyl, and
wherein the compound having an acid value of 100 to 1,000 mgKOH/g is at least one selected from the group consisting of compounds represented by Chemical Formulas 10 to 21:
2. The polarizing plate of claim 1 , wherein the radically curable composition includes:
40 to 90 parts by weight of the compound represented by Chemical Formula 1;
1 to 50 parts by weight of the vinyl ether compound;
1 to 50 parts by weight of the carboxylic acid compound including at least one unsaturated double bond; 10 to 50 parts by weight of the compound having an acid value of 100 to 1,000 mgKOH/g; and
0.5 to 10 parts by weight of the radical initiator, based on 100 parts by weight of the total composition.
3. The polarizing plate of claim 1 , wherein the compound represented by Chemical Formula 1 is at least one selected from among compounds represented by Chemical Formulas 2 to 9:
4. The polarizing plate of claim 1 , wherein the vinyl ether compound is at least one selected from the group consisting of ethylene glycol monovinyl ether, 1,4-buthanol vinyl ether, di(ethylene glycol) divinyl ether, tri(ethylene glycol) divinyl ether, tert-butyl vinyl ether, 1-(vinyloxy)-2,2-bis((vinyloxy)methyl)butane, 1,3-bis(vinyloxy)-2,2-bis((vinyloxy)methyl)propane and cyclohexyl vinylether.
5. The polarizing plate of claim 1 , wherein the carboxylic acid compound including at least one unsaturated double bond is at least one selected from the group consisting of a maleic acid, a fumaric acid, an angelic acid and a tiglic acid.
6. The polarizing plate of claim 1 , wherein the radically curable composition further includes: a photoacid generator.
7. The polarizing plate of claim 1 , wherein a glass transition temperature of the radically curable composition after curing is 60° C. to 500° C.
8. The polarizing plate of claim 1 , further comprising: a protective film attached to a surface of the polarizer, opposite to the surface thereof on which the protective layer is formed, via an adhesive layer.
9. The polarizing plate of claim 8 , wherein the protective film is a cellulose film, a polyethylene terephthalate (PET) film, a cycloolefin polymer (COP) film, or an acrylic film.
10. The polarizing plate of claim 1 , further comprising: a pressure sensitive adhesive (PSA) formed on the protective layer.
11. A display device comprising: the polarizing plate of claim 1 .