Patent ID: 7915467

Claim:
A semiconductor wafer having a wafer and a resin layer composed of a resin composition comprising a cyclic olefin resin (A) having an epoxy group and a photoacid generator (B), wherein the resin layer is formed on a circuit element forming surface of the semiconductor wafer, and the residual stress of the resin layer after curing is 1 to 20 MPa, wherein the cyclic olefin resin (A) having an epoxy group contains a repeating unit represented by the formula (1): wherein X is O, CH 2 or (CH 2 ) 2 ; n is an integer of 0 to 5; R 1 to R 4 are each independently selected from a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an aralkyl group, a functional group containing an ester group, a functional group containing a ketone group, a functional group containing an ether group, and a functional group containing an epoxy group; R 1 to R 4 may be different in a repetition of a monomer; and at least one of R 1 to R 4 in all the repeating units is the functional group having an epoxy group, and wherein wafer thickness is 10 to 200 μm.