Patent ID: 8378046

Claim:
A pressure-sensitive adhesive comprising a random copolymer having: a) 10 to 90 parts by weight of said monomer units having pendent biphenyl groups; b) 90 to 10 parts by weight of said alkyl (meth)acrylate monomer units; c) 1 to 15 parts by weight of acid functional monomer units; d) 0 to 15 parts by weight of polar monomers; and e) 0 to 5 parts by weight of other monomers, wherein the sum of the monomers is 100 parts by weight; and optionally a plasticizer, wherein the monomer units having pendent biphenyl groups are of the formula: wherein X 1 and X 2 are each independently —O—, —S—, or —NR 3 —, where R 3 is H or C 1 -C 4 alkyl; R 1 is an alkylene of 1 to 8 carbons optionally containing one or more catenary ether oxygen atoms or pendent hydroxy groups; n is 0 or 1; and R 2 is either H or CH 3 ; such that when n is 0, the biphenyl group comprises 2-substituted biphenyl, and wherein the monomer units having pendent biphenyl groups have as homopolymers a glass transition temperature of 70° C. or less.