Pressure-sensitive adhesives based on preferentially tackified immiscible elastomers

A hot melt pressure-sensitive adhesive composition comprising an admixture of two immiscible elastomers, each providing a polymerized diene segment, said admixture providing a first elastomer having a first glass transition temperature attributable to a polymerized diene of a first glass transition temperature and a second elastomer having a second glass transition temperature attributable to a polymerized diene of higher glass transition temperature higher than the first glass transition temperature, said mixture tackified by the addition of at least one tackifying system comprising a tackifier, which is preferentially miscible in the polymerized diene having the second glass transition temperature, and said tackifying system being present in an amount of 50 to about 80% by weight of total tackifiers and elastomers and sufficient to increase the glass transition temperature of the second diene in relation to the glass transition temperature of the first diene and increase the tangent delta of the elastomer having the second glass transition temperature.