Composition comprising styrene isoprene block copolymer and ethylenically unsaturated monomer

A composition consisting of:

• at least 20 wt. % of block copolymer comprising polyvinyl aromatic end blocks and a polyisoprene midblock;
• and
• at least one ethylenically unsaturated aromatic monomer comprising one or more groups selected from (meth)acryl or vinyl ether, wherein the monomer has a Log P according to Moriguchi's method of at least 2.2 and the monomer is present is an amount no greater than 20 wt.-% of the composition;
• free-radical initiator;
• tackifier;
• and
• optional additives selected from antioxidants, ultraviolet absorbers, light stabilizers, fillers, pigments, and crosslinkers.

An article comprising:

• a substrate;
• and
• a composition disposed on the substrate;
• wherein the composition comprises
• at least 20 wt. % of block copolymer comprising polyvinyl aromatic end blocks and a polyisoprene midblock;
• and
• at least one ethylenically unsaturated aromatic monomer comprising one or more groups selected from (meth)acryl or vinyl ether, wherein the monomer has a Log P according to Moriguchi's method of at least 2.2 and the monomer is present is an amount no greater than 20 wt.-% of the composition.