Pressure sensitive adhesive composition for electro-magnetic shielding film and electro-magnetic shielding filter using the same
a technology of electro-magnetic shielding film and adhesive composition, which is applied in the direction of film/foil adhesive, magnetic/electric field screening, electrical equipment, etc., can solve the problems of reducing visibility, difficult to make into wide screens, and limited view angle, so as to prevent copper oxidation, prevent discoloration of electro-magnetic shielding filters, and improve durability
Inactive Publication Date: 2006-05-11
LG CHEM LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The present invention relates to an adhesive composition for an electro-magnetic shielding film and an electro-magnetic shielding filter. The adhesive composition does not contain any acidic groups, which prevents oxidation of copper and improves durability. The electro-magnetic shielding filter made with the adhesive composition offers good resolution and image quality without color change due to oxidation of copper. The technical effect of the invention is to provide an improved adhesive composition for electro-magnetic shielding films and filters that offer better durability and color stability.
Problems solved by technology
However, they are not suitable for wide screens of 40 inches or larger because of size and weight.
LCDs are superior in terms of power consumption and driving voltage, but they are difficult to make into wide screens and are limited in view angle.
Then, because of the difference in refractive indices of air and the polymer layer, light emergent from the plasma display panel becomes scattered, thereby reducing visibility.
If the filter discolors during use, it cannot offer good resolution and image quality.
Especially, color change due to oxidation of the copper mesh under high temperature and high humidity is a serious problem.
The durability of adhesive at the area where it contacts the copper mesh is a problem.
Therefore, the cause of discoloration of the transparentized adhesive is oxidation of copper.
Particularly, when monomers having acidic groups (—COOH) are used, the acidic groups (—COOH) oxidize copper under high temperature and high humidity, thereby discoloring the electro-magnetic shielding filter and reducing color resolution.
Method used
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example 2
[0065] The procedure of Example 1 was performed except for using 2-hydroxypropyl(meth)acrylate instead of 2-hydroxyethyl(meth)acrylate (2-HEMA).
example 3
[0066] (Preparation of Acrylic Copolymer)
[0067] An acrylic copolymer (PA-2) having a molecular weight of 1,000 K (measured with standard polystyrene sample) was prepared in the same manner of Example 1 using a monomer mixture comprising 94 parts by weight of n-butylacrylate (BA) and 6 parts by weight of 2-hydroxyethyl(meth)acrylate (2-HEMA), and 0.04 part by weight of azobisisobutyronitrile (AIBN) diluted to 50% in ethyl acetate as a reaction initiator.
[0068] (Preparation of Acrylic Adhesive Composition)
[0069] The procedure of Example 1 was performed except for using PA-2 as acrylic copolymer.
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Abstract
The present invention relates to an adhesive composition for an electro-magnetic shielding film and an electro-magnetic shielding filter using the same, and more particularly to an adhesive composition for an electromagnetic shielding film having: a) an acrylic copolymer of i) (meth)acrylate ester monomers having C1 to C12 alkyl groups and ii) vinylic monomers having hydroxyl groups; and b) a multifunctional isocyanate crosslinking agent. The electro-magnetic shielding filter of the present invention offers good durability because transparentization is performed with an acrylic adhesive composition having no acidic groups, and thus oxidation of copper is prevented.
Description
TECHNICAL FIELD [0001] The present invention relates to an adhesive composition for an electro-magnetic shielding film and an electro-magnetic shielding filter using the same, and more particularly to an adhesive composition for an electro-magnetic shielding film wherein the adhesive contains no acidic groups so that oxidation of copper is prevented and thereby having superior durability, and an electro-magnetic shielding filter using the same. BACKGROUND ART [0002] Recently, with interest in digital televisions and high-quality wide-screen televisions increasing, development of cathode ray tubes (CRTs), liquid crystal displays (LCDs), and plasma display panels (PDPs) is actively progressing. [0003] CRTs, which are widely used as displays in TVs, are superior in resolution and image quality. However, they are not suitable for wide screens of 40 inches or larger because of size and weight. [0004] LCDs are superior in terms of power consumption and driving voltage, but they are diffic...
Claims
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IPC IPC(8): C08F120/10C09J133/10C08F220/18C08F220/28C09J7/02C09J11/00C09J133/06C09J133/14C09J157/10C09J163/00C09J175/04H01J11/44H05K9/00
CPCC08F220/18C08F220/28Y10T428/28C09J133/066C08L2312/00C08F220/20C08F220/1804C09J133/10
Inventor LEE, DONG-WOOKHAN, IN-CHEONPARK
Owner LG CHEM LTD