Lg Chem, Ltd

Seung Joon Park

In Cheon Han

No Ma Kim

Jeong Min Ha

Suk Ky Chang

Woo Ha Kim

Se Ra Kim

Kee Young Kim

No Ma 1009-104 Hanwa Ggumegreen Kim

Suk Ky 7-401 Science Vill Chang

The present invention relates to a polarizing plate characterized in that pressures-sensitive adhesives used in the upper and lower polarizing plates have different elastic properties and a liquid crystal display device comprising the same. More specifically, the present invention relates to a polarizing plate with improved light leakage phenomenon in accordance with bend of liquid crystal panels, characterized in that as slid distances of pressure-sensitive adhesives on the polarizing plate having the pressure-sensitive adhesive layer formed thereon and bonded to a glass plate with a contact area of 1 cm&#xd7;1 cm at the time of applying a load of 1,000 gf at room temperature (25&#xb0; C.) for 1,000 seconds, the difference between the slid distance Xof pressure-sensitive adhesive for the upper polarizing plate and the slid distance Xof pressure-sensitive adhesive for the lower polarizing plate is 50 to 500 &#x3bc;m.

Polarizing plate having pressure sensitive adhesive layer with improved light leakage property

The present invention relates to an acrylic pressure-sensitive adhesive composition, a polarizing plate and a liquid crystal display device, using the same. More specifically, the present invention relates to an acrylic pressure-sensitive adhesive composition having optimal stress releasing property which comprises an optically compensated acrylic copolymer (A) containing a cross-linkable functional group, an optically compensated acrylic copolymer (B) containing no cross-linkable functional group, and a multi-functional cross-linking agent (C). A polarizing plate and a liquid crystal display device comprising the pressure-sensitive adhesive composition meets with major properties such as adhesion endurance reliability, with effectively providing optical compensation effect and stress release effect, and has an effect of improving a light leakage phenomenon.

Optically compensated acrylic pressure-sensitive adhesive composition, polarizing plate and liquid crystal display device containing the same

The present invention relates to an acrylic pressure sensitive adhesive composition comprising (meth)acrylic copolymers including alkyl(meth)acrylic acid ester monomer having 1&#x2dc;12 carbon atoms of alkyl group, characterized in that the gel content is 10&#x2dc;55%, the swelling ratio is 30&#x2dc;110, the weight average molecular weight of sol eluted from the adhesive by ethyl acetate is at least 800,000, the molecular weight distribution is 2.0&#x2dc;7.0; and a polarizer and a liquid crystal display comprising the above composition show excellent durability under a high temperature and humidity condition, and can improve the light leakage phenomenon and provide excellent operability at the time of manufacturing polarizer by effectively providing high modulus and stress release property.

Acrylic pressure-sensitive adhesive composition for polarizing film

The present invention relates to an acrylic pressure sensitive adhesive composition comprising (meth)acrylic copolymers including alkyl(meth)acrylic acid ester monomer having 2&#x2dc;14 carbon atoms of alkyl group, characterized in that the gel fraction is 10&#x2dc;55%, the swelling ratio is 30&#x2dc;110, the weight average molecular weight of sol eluted from the final adhesive by ethyl acetate is at least 800,000, comprising low molecular weight molecule having the maximum 100,000 of weight average molecular weight by 10 &#x2dc;40 wt % of the total sol component; and the above composition show excellent durability under a high temperature and/or humidity condition, and can improve the light leakage phenomenon and provide excellent operability at the time of manufacturing polarizer by effectively providing high modulus and stress release property.

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Daejeon, South Korea

Seung Joon Park