Radical curing adhesive composition and polarizing plate comprising same
The present invention relates to a radical-curable adhesive composition including a first compound represented by the following [Chemical Formula I]; a radical-curable second compound having two or more benzene rings, (meth)acryloyl groups and carboxyl groups each in the molecule; and a radical initiator, and a polarizing plate including the radical-curable adhesive composition.
1. A radical-curable adhesive composition comprising:
a (A) first compound represented by the following Chemical Formula I;
a (B) radical-curable second compound having two or more benzene rings, two or more (meth)acryloyl groups and two or more carboxyl groups in each molecule; and
a (C) radical initiator:
wherein R 1 is an ester group or an ether group; R 2 is a C 1˜10 alkyl group, a C 4˜10 cycloalkyl group or a combination thereof, and herein, R 2 has at least one hydroxyl substituent in the molecule; and R 3 is hydrogen, or a substituted or unsubstituted C 1˜10 alkyl group.
2. The radical-curable adhesive composition of claim 1 , wherein the second compound is a compound represented by the following Chemical Formula II:
wherein R 4 and R 5 are each independently a C 1˜10 aliphatic chain, a C 4˜14 aliphatic ring, a C 6˜14 aromatic ring or a combination thereof; R 6 and R 7 are each independently a C 1˜14 alkyl group, a C 4˜14 cycloalkyl group, a C 6˜14 aryl group or a combination thereof, and herein, R 6 and R 7 each independently have at least one carboxyl substituent in the molecule; R 8 and R 9 are each independently an acryloyl group or a methacryloyl group; R 10 is a single bond or a C 1˜10 alkylene group; R 11 and R 12 are each independently a halogen atom or a C 1˜10 alkyl group; a and b are each independently an integer of 0 to 2; X 1 and X 2 are each independently a single bond or —O—; X 3 and X 4 are each independently a single bond, —O—, —CO—, —COO— or —OCO—; and X 5 and X 6 are each independently a single bond or —O—.
3. The radical-curable adhesive composition of claim 1 comprising:
the first compound in 10 to 80 parts by weight;
the second compound in 10 to 80 parts by weight; and
the radical initiator in 0.5 to 10 parts by weight, with respect to 100 parts by weight of the radical-curable adhesive composition.
4. The radical-curable adhesive composition of claim 1 , wherein the first compound includes one or more types of compounds selected from the group consisting of compounds represented by the following Chemical Formula 1 to Chemical Formula 10:
5. The radical-curable adhesive composition of claim 1 , wherein the second compound includes one or more types of compounds selected from the group consisting of compounds represented by the following Chemical Formula 11 and Chemical Formula 12:
6. The radical-curable adhesive composition of claim 1 , wherein an acid value of the second compound is 50 to 300 mg KOH/g.
7. The radical-curable adhesive composition of claim 1 , further comprising a photoacid generator.
8. The radical-curable adhesive composition of claim 1 , which has a glass transition temperature of 60° C. or higher after curing.
9. The radical-curable adhesive composition of claim 1 , which has viscosity of 10 to 200 cP.
10. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 1 .
11. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 2 .
12. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 3 .
13. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 4 .
14. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 5 .
15. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 6 .
16. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 7 .
17. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 8 .
18. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a polarizer protective film formed on the adhesive layer,
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 9 .
19. The polarizing plate of claim 10 , which is a polyvinyl alcohol-based film in which iodine or dichroic dye is adsorbed and oriented.