Block copolymer hot-melt processable adhesives, methods of their preparation, and articles therefrom

A composition comprising:

• 100 parts by weight of at least one block copolymer comprising at least two A blocks and at least one B block, wherein the B block is derived from monoethylenically unsaturated monomers comprising at least one of a (meth)acrylate monomer or a vinyl-terminated monomer, which as a homopolymer has a glass transition temperature (Tg) of less than about 20° C., and the A blocks are polymers independently derived from a (meth)acrylate monomer, which as a homopolymer has a glass transition temperature (Tg) of greater than about 20° C., and the boundaries between microdomains comprising the A blocks and a continuous phase comprising the B blocks are essentially free of tapered structures;
• and
• at least 40 parts by weight of at least one tackifier based on total weight of the block copolymer;
• wherein said composition is a hot melt processable adhesive.

A composition comprising:

• 100 parts by weight of at least one block copolymer comprising at least two A blocks and at least one B block, wherein the A and B blocks are each independently derived from a monomer having a structure as follows:
• wherein:
• R1 is H or CH3;
• and
• R2 is a hydrocarbon group, such that R2 for each A block has a total number of carbon atoms differing by at least two from R2 for the B block, and the boundaries between microdomains comprising the at least two A blocks and a continuous phase comprising the at least one B block are essentially free of tapered structures;
• and
• at least 40 parts by weight of at least one tackifier based on total weight of the block copolymer;
• wherein said composition is a hot melt processable adhesive.