Patent ID: 7201969
Filing Date: 2007-04-10
Classification: C09J,H01L,Y10T

Abstract:
1. A surface protecting adhesive film for a semiconductor wafer comprising: a base film which comprises at least one layer of a synthetic resin wherein the base film has a storage elastic modulus (E′) at 25° C. of from 1×10 an adhesive layer of 5 to 50 μm in thickness formed on one surface of the base film, wherein the adhesive layer comprises 100 weight parts of a polymer (A) having a functional group capable of reacting with a cross-linking agent and a temperature (Ta) in a range of from −50° C. to 5° C. at which tan δ of a dynamic viscoelasticity of the polymer(A) is maximized, from 10 weight parts to 100 weight parts of a polymer (B) having a functional group capable of reacting with a cross-linking agent and a temperature (Tb) in a range of from more than 5° C. to 50° C. at which tan δ of a dynamic viscoelasticity of the polymer(B) is maximized, and from 0.1 weight part to 10 weight parts of a cross-linking agent (C) having two or more cross-linkable functional groups in a molecule based on 100 weight parts of total amount of the polymers (A) and (B), and wherein the adhesive force of the surface protecting adhesive film for the semiconductor wafer measured on the basis of a method defined in JIS Z0237 using a SUS304-BA plate as an adherend, at a peeling rate of 300 mm/min and a peeling angle of 180° is from 1 N/25 mm to 15 N/25 mm.