Compositions containing blends of polystyrene-polyisoprene-polystyrene block copolymers

A composition of matter which comprises

• a blend of A-B-A block copolymers, where the A component of each block copolymer of the blend is polystyrene and the B component is polyisoprene, said blend including
• A) a first A-B-A block copolymer having an overall number average molecular weight ranging from about 90,000 to about 250,000, wherein the polyisoprene has a number average molecular weight ranging from about 80,000 to about 225,000, the polystyrene block has a number average molecular weight ranging from about 8,000 to about 17,000 and the overall styrene content of the block copolymer ranges from about 10 percent to about 24 percent, and
• B) a second A-B-A block copolymer having an overall number average molecular weight ranging from about 60,000 to about 110,000, wherein the polyisoprene has a number average molecular weight ranging from about 30,000 to about 70,000, the polystyrene block has a number average molecular weight ranging from about 12,000 to about 20,000, and the overall styrene content of the block copolymer ranges from about 25 percent to about 50 percent,
• from about 40 parts to about 95 parts of the first A-B-A block copolymer,
• from about 5 parts to about 60 parts of the second A-B-A block copolymer,
• from about 80 parts to about 225 parts of compatible primary tackifying resin, or resins, per 100 parts by weight of the blend of block copolymers, and
• from about 0.1 percent to about 2 percent of a stabilizer, based on the weight of the total composition.