Patent ID: 8039553

Claim:
An adhesive composition comprising (A) a block copolymer composition, the block copolymer composition (A) comprising: a block copolymer (a) formed from at least two polymer blocks composed mainly of a styrene and at least one polymer block composed mainly of a conjugated diene compound and a block copolymer (b) formed from at least one polymer block composed mainly of a styrene and at least one polymer block composed mainly of a conjugated diene compound, wherein the block copolymer (a) has a peak molecular weight of 60,000 to 110,000 in terms of standard polystyrene as measured by GPC, all of the polymer blocks composed mainly of a styrene, which constitutes the block copolymer composition (A), have a peak molecular weight of 10,000 to 30,000 and a molecular weight distribution Mw/Mn of 1.0 to 1.6, the block copolymer composition (A) has a total styrene content of more than 40% by weight and 50% by weight or less, the block copolymer composition (A) has a content of the block copolymer (b) of 50 to 90% by weight, the conjugated diene unit in the block copolymer composition (A) has a vinyl bond content of less than 20%, and the block copolymer composition (A) has a viscosity in a 15% toluene solution of 10 to 40 cP at 25° C.