Patent ID: 7645507

Claim:
A protective film in the form of a tape or sheet comprising a substrate layer and a pressure sensitive adhesive composition, said pressure sensitive adhesive comprising: (I) 100 parts by weight (pbw) of a block copolymer containing at least two poly(monovinyl aromatic hydrocarbon) blocks and at least one hydrogenated poly(conjugated) diene block, (II) 0 to 200 pbw of a tackifying resin, (III) 0 to 50 pbw of a polyolefin, (IV) 0 to 100 pbw of a plasticizer, and (V) 0 to 5 pbw of antioxidant, wherein at least one of (II), (III), (IV) and (V) are present in said pressure sensitive adhesive composition; and wherein the block copolymer of said pressure sensitive adhesive composition i. has a molecular structure according to the general formulae S-EB-S(1) or (S-EB)nX(2), wherein each S independently is a polymer block of predominantly styrene and EB is a hydrogenated polymer block of predominantly butadiene, n is an integer equal to or greater than 2, and X is the residue of a coupling agent, ii. has a poly(styrene) content (PSC) from 17 to 24 wt %, iii. has an apparent molecular weight of the poly(styrene) blocks (S) that is in the range of from 5,000 to 12,000, iv. has an 1,2-addition degree (vinyl content) in the precursor poly(butadiene) block (EB) precursor is in the range of from 60 to 85 (mole/mole), v. has a block EB that has a hydrogenation degree of at least 80%, and vi. has an optional diblock S-EB content of at most 10 mole %, relative to the total block copolymer amount.