Patent ID: 6879026

Claim:
An adhesive film for protecting a surface of a semiconductor wafer comprising a substrate film having on one surface thereof an adhesive layer formed, characterized in that said substrate film satisfies the following requisites (A) and at least one of (B) or (C): requisite (A): high rigidity properties in which the value of film bending resistance at 50° C. is within the range from 0.08 to 1.50N; requisite (B): properties in which the value of film bending resistance at 900° C. is one-third or less than the value of film bending resistance at 50° C.; requisite (C): high elastic modulus properties with expansibility by water absorption in which size-changing ratio by absorbing water for four hours at 23° C. and 90% RH is 0.05 to 0.5%.