Patent ID: 9096032
Filing Date: 2015-08-04
Classification: B32B,C09J,H01L,Y10T

Abstract:
1. A wafer processing laminate comprising a support, a temporary adhesive layer on the support, and a wafer laid contiguous to the temporary adhesive layer, the wafer having a circuit-forming front surface and a back surface to be processed, said temporary adhesive layer being a composite temporary adhesive layer having a trilayer structure consisting of a first temporary bond layer (A) of thermoplastic siloxane bond-free polymer which is releasably bonded to the front surface of the wafer, a second temporary bond layer (B) of thermoplastic siloxane polymer which is laid contiguous to a central region of the first temporary bond layer excluding a peripheral region, and a third temporary bond layer (C) of thermosetting modified siloxane polymer which is laid contiguous to the support, wherein in the peripheral region where the second temporary bond layer (B) is removed, a peripheral portion of the first temporary bond layer (A) is in close contact with a peripheral portion of the third temporary bond layer (C).