| 摘要 |
Disclosed is a pressure sensitive adhesive comprising a tackifying resin and a block copolymer having the general formula: S1-B1-S2-B2 wherein S1, B1, S2, and B2 are polymer blocks, and B1 is a block of polymerized conjugated diene comprising at least 50 mole percent isoprene and having an apparent molecular weight of from about 150,000 to about 400,000; S1 and S2 are blocks of polymerized mono-vinylaromatic hydrocarbon having a weight average molecular weight of about 12,000 to about 40,000; and B2 is a block of polymerized conjugated diene comprising at least 50 mole percent isoprene having an apparent molecular weight of from about 15,000 to about 60,000. The weight ratio of B1 over B2 is from about 3.0 to about 12.0; and the content of polymerized mono-vinylaromatic hydrocarbon is from about 10 to about 35 weight percent. The pressure sensitive adhesive can be used in the production of a composition comprising a substrate and adherent thereto the adhesive, such as a label, tape, or a disposable product.
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