Patent ID: 8652942
Filing Date: 2014-02-18
Classification: C08G,C08L,C09D,C09J,H01L

Abstract:
1. A method for manufacturing electronic parts, comprising a semi-cured adhesive layer-forming step of forming a semi-cured adhesive layer by coating a pasty adhesive entirely over the rear face of a wafer and curing the pasty adhesive partially by radiation-ray irradiation or heating into the sheet shape, a fixing step of fixing the semi-cured adhesive layer formed on a wafer and a ring frame by bonding them to the cohesive layer of a cohesive sheet, a dicing step of dicing the wafer together with the semi-cured adhesive layer with a dicing blade into semiconductor chips, and a pick-up step of picking up the chips carrying the semi-cured adhesive layer from the cohesive layer of the cohesive sheet after radiation-ray irradiation, wherein: the cohesive sheet has a base film and a cohesive layer laminated on one face of the base film; the cohesive constituting the cohesive layer contains a (meth)acrylate ester copolymer, an ultraviolet polymerizable compound, a multifunctional isocyanate curing agent and a photopolymerization initiator; and the temperature of the photopolymerization initiator, at which the weight loss rate thereof, which is calculated by the following equation: (wherein, the mass before heating is the mass of the photopolymerization initiator at 25° C.; the mass after heating is the mass of the photopolymerization initiator at each temperature when it is heated from 23° C. to 500° C. at a heating rate of 10° C./minute) becomes 10%, is 250° C. or higher.