BASE FILM FOR DICING SHEET, DICING SHEET COMPRESING BASE FILM, AND METHOD OF MANUFACTURING BASE FILM

摘要

Base film for a dicing sheet comprises a cutting-fragment suppression layer and an expandable layer laminated on one main surface of the cutting-fragment suppression layer. The expandable layer comprises at least one resin-based unit layer. The at least one resin-based unit layer includes a resin-based unit layer that is disposed nearest to the cutting-fragment suppression layer. The resin-based unit layer comprises a linear polyethylene, polypropylene, and thermoplastic elastomer. The cutting-fragment suppression layer comprises a ring-containing resin that is a thermoplastic resin having at least one type of an aromatic series-based ring and an aliphatic series-based ring and an acyclic olefin-based resin that is an olefin-based thermoplastic resin other than the ring-containing resin. The base film for such a dicing sheet is excellent in the expandability and recoverability.