Patent ID: 7300606

Claim:
A Pb free Ag paste composition for a PDP address electrode comprising: a) 60 to 90% by weight of an Ag powder; b) 1 to 10% by weight of a Pb free inorganic binder; c) 0.001 to 1% by weight of an inorganic thickener; and d) 5 to 38% by weight of an alkali-soluble, negative photoresist composition for fine conductive powder dispersion comprising i) 5 to 50% by weight of an acrylate copolymer for photoresist, having a molecular weight of 5,000 to 50,000, and represented by formula 1: wherein R 1 is a hydrogen, phenyl group, phenyl group substituted with nitro group, phenyl group substituted with halogen, or benzyl group substituted with nitro group; R 2 is an alkyl group selected from the group consisting of ethylhexyl group, isobutyl group, tert-butyl group or octyl group; R 3 is a hydrogen or alkyl group; R 4 is a hydrogen or alkyl group; and n 1 and n 2 are an integer of 1 to 120, or formula 2: wherein R 5 is a hydrogen or carboxyl group; R 6 is a phenyl group, or carboxyl group; R 7 is a hydrogen or —CH 2 COOH group; and R 2 , R 4 , n 1 , and n 2 are the same as defined in formula 1; and where the acrylate polymer comprises A.) 20 to 50% by weight of an unsaturated carboxylic acid, B.) 15 to 45% by weight of an aromatic monomer, C.) 3 to 15% by weight of monomers having their own plasticity, D.) 10 to 30% by weight of acryl monomers excluding acryl monomers having their own plasticity, where the amount of each monomer is by weight of the acrylate polymer; ii) 5 to 40% by weight of a photopolymerizable monomer; iii) 5 to 20% by weight of a photopolymerization initiator; iv) 5 to 10% by weight of a defoamer; v) 4.5 to 30% by weight of a leveling agent; vi) 0.5 to 10% by weight of a plasticizer; and vii) 30 to 60% by weight of a solvent wherein the Ag paste composition has a viscosity of 3000 to 60000 cP.