Patent ID: 7270877

Claim:
A protective tape used for an optical member, comprising: a plastic film base; a pressure-sensitive adhesive layer formed on one side of the plastic film base; and a treated layer formed on an opposite side of the plastic film base and having a structure in which a copolymer (A) constituted by (a) an alkyl (meth)acrylate having an alkyl group with carbon numbers of 8 to 20; (b) (meth)acrylonitrile; and (c) a monomer having functional groups copolymerized with the components (a) and (b), wherein the components (a), (b), and (c) are copolymer constituents, is further cross-linked by a cross-linking agent having at least two functional groups having reactivity with functional groups present in the monomer to form a cross-link structure.