Radical curable adhesive composition, and polarizing plate and optical member comprising same
The present invention relates to a radical-curable adhesive composition including a (A) radical-polymerizable compound that includes at least one hydrophilic functional group in the molecule in greater than 30 parts by weight and less than or equal to 93 parts by weight; a (B) multifunctional (meth)acryl-based compound in 5 to 40 parts by weight; a (C) phosphate compound that includes one or two (meth)acrylic groups in the molecule in 1 to 40 parts by weight; and a (D) radical initiator in 0.5 to 20 parts by weight, with respect to 100 parts by weight of the radical-curable adhesive composition, and a polarizing plate and an optical member including the radical-curable adhesive composition.
1. A radical-curable adhesive composition comprising:
a (A) radical-polymerizable compound that includes at least one hydrophilic functional group in the molecule in greater than 30 parts by weight and less than or equal to 93 parts by weight; a (B) multifunctional (meth)acryl-based compound in 5 to 40 parts by weight; a (C) phosphate compound that includes one or two (meth)acrylic groups in the molecule in 1 to 40 parts by weight; and a (D) radical initiator in 0.5 to 20 parts by weight, with respect to 100 parts by weight of the radical-curable adhesive composition,
wherein a total hydroxyl value of the radical-curable adhesive composition is 508 to 900 mg KOH/g,
wherein the (B) multifunctional (meth)acryl-based compound includes a compound represented by [Chemical Formula I]:
wherein, in [Chemical Formula I], R 1 and R 2 are each independently a (meth)acryloyloxy group or a (meth)acryloyloxyalkyl group, and
wherein the (A) radical-polymerizable compound includes one or more compounds selected from the group consisting of compounds represented by [Chemical Formula 1] to [Chemical Formula 24]:
2. The radical-curable adhesive composition of claim 1 , wherein the (A) radical-polymerizable compound is a mixture of a (a-1) radical-polymerizable compound having one hydroxyl group in the molecule and a (a-2) radical-polymerizable compound having at least two hydroxyl groups in the molecule.
3. The radical-curable adhesive composition of claim 1 , wherein the (C) phosphate compound includes a compound represented by the following [Chemical Formula IV]:
wherein, in [Chemical Formula IV], R 10 is 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 11 is hydrogen or a methyl group; n is an integer of 1 or 2, m is an integer of 1 or 2 and n+m is 3.
4. The radical-curable adhesive composition of claim 1 , wherein a thickness of an adhesive layer formed by the radical-curable adhesive composition is 10 μm or less.
5. The radical-curable adhesive composition of claim 1 , which has a glass transition temperature of 50° C. or higher after curing.
6. The radical-curable adhesive composition of claim 1 , which has viscosity of 10 to 300 cP.
7. 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 .
8. An optical member comprising:
a display panel; and
a polarizer attached to an external-most surface of the display panel through a medium of an adhesive layer;
wherein the adhesive layer is formed using the radical-curable adhesive composition of claim 1 .