EXPANDABLE SUBSTRATE FILM, EXPANDABLE ADHESIVE FILM, DICING FILM, PRODUCTION METHOD OF EXPANDABLE SUBSTRATE FILM AND PRODUCTION METHOD OF SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an expandable substrate film which is suppressed in necking and has high and uniform expandability.;SOLUTION: An expandable substrate film contains a composition (X) comprising a polymer (A) which contains 90-100 mol% of structural units (P) derived from 4-methyl-1-pentene and has a ratio of structural units derived from α-olefins other than 4-methyl-1-pentene to all the structural units of 0-10 mol% and a copolymer (B) which contains 65 mol% or more and less than 90 mol% of the structural units (P) and 10-35 mol% of structural units derived from 2-20C α-olefins other than 4-methyl-1-pentene, and the content of (A) to the total of (A) and (B) of 100 pts.mass is 50-99 pts.mass.;COPYRIGHT: (C)2016,JPO&INPIT