Patent ID: 8445597

Claim:
A pressure-sensitive adhesive composition for bonding an EMI film to a PDP device, wherein the composition comprises a high molecular weight acrylic polymer A having requirements a-1 to a-6 below and a low molecular weight acrylic polymer B having requirements b-1 to b-5 below in a weight ratio A:B=100:5-20, and is crosslinked with a crosslinking agent to a gel fraction of 50 to 70% and has a 90° peel strength (peeling rate=50 mm/min) of 10 to 15 N/25 mm: <high molecular weight acrylic polymer A> the polymer is a copolymer which comprises: a-1: an alkyl (meth)acrylate monomer having C 1-12 alkyl group and, based on 100 parts by weight of the (meth)acrylate monomer (a-1), a-2: 1 to 5 parts by weight of a COOH or OH group-containing monomer, and a-3: 0 to 5 parts by weight of a monomer copolymerizable with the (meth)acrylate monomer (a-1); and which has: a-4: a weight average molecular weight (Mw) of 500,000 to 700,000, a-5: a molecular weight distribution (Mw/Mn) of not more than 5, and a-6: a glass transition temperature (Tg-A) of the acrylic polymer A in the range of −40 to −20° C.; <low molecular weight acrylic polymer B> the polymer is a copolymer which comprises: b-1: a (meth)acrylate monomer and, based on 100 parts by weight of the (meth)acrylate monomer (b-1), b-2: greater than 0 to less than 10 parts by weight of a monomer copolymerizable with the (meth)acrylate monomer (b-1), and which has: b-3: a weight average molecular weight (Mw) of 20,000 to 40,000, b-4: a molecular weight distribution (Mw/Mn) of not more than 5, and b-5: a glass transition temperature (Tg-B) of the acrylic polymer B in the range of 40 to 105° C.