Radical curable adhesive composition, and polarizing plate and optical member comprising same

Patent metadata

Field	Value
Publication number	US-10072183-B2
Application number	US-201415025748-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Sep 30, 2013
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

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.

First claim

The invention claimed is:

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 .

Assignees

• Lg Chemical Ltd

Inventors

• Huh Eun-Soo
• Park Kwang-Seung
• Lee Mi-Rin
• Park Jun-Wuk

Classifications

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02B5/305

  including organic materials, e.g. polymeric layers · CPC title

• C09J7/20

  characterised by their carriers · CPC title

• C08F220/281

  and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate · CPC title

• C09J4/00 Primary

  Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16} · CPC title