Patent ID: 8129023

Claim:
A polymer particle for anisotropic conductive packaging materials prepared by copolymerizing a styrene-based monomer, acrylonitrile, or a combination thereof with at least one crosslinking polymerizable monomer selected from the group consisting of divinylbenzene, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, divinylsulfone, allyl compound, (poly)alkylene glycol di(meth)acrylate, pentaerythritol (meth)acrylate, methylolpropane (meth)acrylate, glycerol tri(meth)acrylate, and mixtures thereof, wherein said polymer particle has a K value at 10% particle diameter deformation (10% K value) of about 250 to about 700 kgf/mm 2 , a compression recovery factor of less than 30%, and a compressive rupture deformation of about 30% or higher, wherein the polymer particle has a 20% K value (K value at 20% compressive deformation and a 30% K value (K value at 30% compressive deformation) not higher than about 70% of the 10% K value.