Hot melt pressure sensitive adhesive and thermoset comprising styrene-butadiene polymers having high vinyl and high di-block

A hot melt pressure sensitive adhesive, comprising:

• from about 20 to about 35 wt. % of a block copolymer composition comprising (i) a diblock copolymer comprising one block of a monovinylaromatic hydrocarbon, an A block, and one block of a conjugated diene, a B block, having a peak molecular weight from 30,000 to 78,000 and a vinyl content from 35 to 80 mol percent based on the number of repeat monomer units in the conjugated diene block, and (ii) a block copolymer comprising at least two blocks of monovinylaromatic hydrocarbon and at least one block of conjugated diene, the block copolymer selected from the group consisting of linear triblock copolymers having a peak molecular weight that is 1.5 to 3.0 times the peak molecular weight of the diblock copolymer, multiarm coupled block copolymers having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer, and mixtures thereof, wherein each block copolymer has a vinyl content from 35 to 80 mol percent based on the number of repeat monomer units in the conjugated diene block, wherein the melt index for the block copolymer composition is from about 20 g/10 min. to about 35 g/10 min. as determined by ASTM D-1238, condition G (200° C., 5 kg) and wherein the ratio of (i) to (ii) in the block copolymer composition is greater than 1:1;
• from about 30 to about 60 wt. % of a tackifying resin;
• from about 0 to about 45 wt. % of an oil;
• and
• from about 0 to about 3 wt. % of an antioxidant,
• wherein said wt. % is based on the total weight of the hot melt pressure sensitive adhesive.