Radical curable adhesive composition and polarizing plate comprising same
The present invention relates to a radical-curable adhesive composition including a first compound represented by [Chemical Formula I]; a radical-curable second compound including at least one carboxyl group conjugated with a carbon-carbon unsaturated double bond present in the side chain 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 first compound represented by the following;
a radical-curable second compound represented by the following [Chemical Formula II];
a third compound having an acid value of 100 to 1000 mg KOH/g, wherein the third compound is a compound excluding the second compound having an acid value of 100 to 1000 mg KOH/g; and
a radical initiator:
wherein, in [Chemical Formula I], 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,
wherein, in [Chemical Formula II], R 4 is a single bond, a substituted or unsubstituted C 1-10 alkylene group, a substituted or unsubstituted C 4-14 cycloalkylene group, a substituted or unsubstituted C 6-14 arylene group or a combination thereof; R 5 is hydrogen; or a substituted or unsubstituted C 1-10 alkyl group, a substituted or unsubstituted C 4-14 cycloalkyl group, a substituted or unsubstituted C 6-14 aryl group or a combination thereof.
2. The radical-curable adhesive composition of claim 1 , comprising:
the first compound in 40 to 90 parts by weight;
the second compound in 1 to 50 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.
3. The radical-curable adhesive composition of claim 1 , wherein the first compound includes one or more types selected from the group consisting of compounds represented by the following [Chemical Formula 1] to [Chemical Formula 8]:
4. The radical-curable adhesive composition of claim 1 , wherein the second compound includes one or more types selected from the group consisting of compounds represented by the following [Chemical Formula 9] to [Chemical Formula 13]:
5. The radical-curable adhesive composition of claim 1 , wherein the third compound includes one or more types selected from the group consisting of compounds represented by the following [Chemical Formula 14] to [Chemical Formula 25]:
and p is an integer of 1 to 5)
6. The radical-curable adhesive composition of claim 1 , wherein a content of the third compound is 1 to 50 parts by weight with respect to 100 parts by weight of the radical-curable adhesive composition.
7. The radical-curable adhesive composition of claim 1 further comprising a photoacid generator.
8. The radical-curable adhesive composition of claim 1 , further comprising:
a multifunctional (meth)acryl-based compound;
a phosphate-based compound including at least one (meth)acrylic group in the molecule; or
a combination thereof.
9. The radical-curable adhesive composition of claim 1 , further comprising:
an epoxy compound including at least one epoxy group in the molecule; and
a photoacid generator.
10. The radical-curable adhesive composition of claim 1 , which has a glass transition temperature of 60° C. or higher after curing.
11. The radical-curable adhesive composition of claim 1 , which has viscosity of 10 to 200 cP.
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 1 .
13. The polarizing plate of claim 12 , which is a polyvinyl alcohol-based film in which iodine or dichroic dye is adsorbed and oriented.