Base film for dicing sheet and dicing sheet

摘要

A base film for a dicing sheet is provided which can suppress dicing debris from generating during the dicing of a cut object without imparting physical energy, such as electron beam or γ ray. The base film for a dicing sheet comprises a resin layer. The resin layer comprises: a ring-containing resin that is a thermoplastic resin having a monomer, as a constitutional unit, having at least one type of an aromatic ring and an aliphatic ring; and an acyclic olefin-based resin that is an olefin-based thermoplastic resin other than the ring-containing resin. The ring-containing resin in the resin layer has a content of more than 3.0 mass %. A dicing sheet is also provided which comprises: the base film for a dicing sheet; and a pressure-sensitive adhesive layer placed on the base film.

主权项

1. A dicing-sheet base film, the dicing-sheet base film comprising a resin layer, wherein
the resin layer comprises: a ring-containing resin that is a thermoplastic resin having at least one of an aromatic ring and an aliphatic ring; and an acyclic olefin-based resin that is an olefin-based thermoplastic resin other than the ring-containing resin, wherein the resin layer contains more than 3.0 mass % and 60 mass % or less of the ring-containing resin, the ring-containing resin has a fluidization temperature of 235° C. or less, the resin layer comprises a phase separation structure that includes a phase comprising the ring-containing resin and a phase comprising the acyclic olefin-based resin, and the resin layer has an internal haze value of 7.0% or more and 98.4% or less.