Patent ID: 6297076
Filing Date: 2001-10-02
Classification: C08F,C09J,H01L

Abstract:
A process for preparing a semiconductor wafer for subsequent dicing into a plurality of semiconductor chips, said process comprising:forming a radiation curable adhesive layer on a substrate film to provide a composite adhesive sheet, wherein the radiation curable adhesive layer includesan acrylic adhesive material made of a copolymer of an acrylic ester and an OH group-containing polymerizable monomer existing in a quantity of 100 parts by weight, anda radiation polymerizable compound having two or more unsaturated bonds in a quantity of 50-200 parts by weight;securing the composite adhesive sheet to the back surface of a semiconductor wafer having respective circuits formed on the front surface thereof by pressing the radiation curable adhesive layer of the composite adhesive sheet onto the back surface of the semiconductor wafer;dicing the semiconductor wafer into a plurality of semiconductor chips each containing a circuit on the front side thereof while retaining the plurality of semiconductor chips on the composite adhesive sheet;irradiating the radiation curable adhesive layer of the composite adhesive sheet with radiation to cure the radiation curable adhesive layer such that the radiation polymerizable compound has an elastic modulus of not less than 1.times.10.sup.9 dyne/cm.sup.2 after curing;removing the plurality of semiconductor chips from the composite adhesive sheet after the adhesive layer thereof has been cured by irradiation;mounting the individual semiconductor chips on a lead frame; andpackaging the individual chips with the back surfaces thereof in at least partial contact with a molding resin.