Pressure sensitive adhesive composition for electro-magnetic shielding film and electro-magnetic shielding filter using the same

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 C 1 to C 12 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.

1 . An acrylic adhesive composition for an electro-magnetic shielding film having crosslinking density ranging from 1 to 95%, comprising: 
 a) an acrylic copolymer of i) (meth)acrylate ester monomers having C 1  to C 12  alkyl groups and ii) vinylic monomers having hydroxyl groups; and    b) a multi functional isocyanate crosslinking agent.    
     
     
         2 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , which comprises: 
 a) 100 parts by weight of an acrylic copolymer of: 
 i) 90 to 99.9 parts by weight of (meth)acrylate ester monomers having C 1  to C 12  alkyl groups; and  
 ii) 0.1 to 10 parts by weight of vinyiic monomers having hydroxyl groups; and  
 b) 0.01 to 10 parts by weight of a multifunctional isocyanate crosslinking agent.  
   
     
     
         3 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , wherein said (meth)acryiate ester monomers having C 1  to C 12  alkyl groups are one or more members selected from the group consisting of butyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, ethyl(meth)acrylate, methyl(meth)acrylate, n-propyl(meth)acrylate, isopropyl(meth)acrylate, t-butyl(meth)acrylate, pentyl(meth)acrylate, n-octyl(meth)acrylate, and isononyl(meth)acrylate.  
     
     
         4 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , wherein said vinylic monomers having hydroxyl groups are one or more members selected from the group consisting of 2-hydroxyethyl(meth)acrylate, 2-hydroxypropyl(meth)acrylate, 2-hydroxyethyleneglycol(meth)acrylate, and 2-hydroxypropyleneglycol(meth)acrylate.  
     
     
         5 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , wherein said vinylic monomers having hydroxyl groups react with isocyanate groups of said multifunctional isocyanate crosslinking agent to form a partial crosslinkage.  
     
     
         6 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , wherein said multifunctional isocyanate crosslinking agent is one or more members selected from the group consisting of tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and a trimethylolpropane adduct of tolylene diisocyanate.  
     
     
         7 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , which further comprises one or more additives selected from the group consisting of a near infrared ray absorbent, epoxy resin, curing agent, silane coupling agent, plasticizer, UV stabilizer, antioxidant, dye, reinforcing agent, and filler.  
     
     
         8 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , wherein said acrylic copolymer is prepared by solution polymerization, photopolymerization, bulk polymerization, suspension polymerization, or emulsion polymerization.  
     
     
         9 . The acrylic adhesive composition for an electro-magnetic shielding film of  claim 1 , which has a crosslinking density ranging from 1 to 95%.  
     
     
         10 . An electromagnetic shielding filter for a plasma display panel transparentized using an acrylic adhesive composition of any of claims  1 .