Laminate for the formation of beam leads for ic chip bonding

G - Physics – 03 – F

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G03F 7/095 (2006.01) G03F 7/033 (2006.01) H05K 3/00 (2006.01) H05K 3/06 (2006.01) H05K 3/40 (2006.01)

Patent

CA 1301522

-0- LAMINATE FOR THE FORMATION OF BEAM LEADS FOR IC CHIP BONDING ABSTRACT A laminate, adapted for manufacturing frames of metal beam leads that are bonded to integrated circuit chips, comprises a) a flexible metal strip, b) a layer of a first resist adhered to one surface of the metal strip, and c) a layer of a second resist adhered to the opposite surface of the metal strip, the second resist being a negative-working resist comprising (1) a polymeric binder, (2) a photopolymerizable monomer mixture, and (3) a photoinitiator composition. The negative-working resist exhibits excellent flexibility and adhesion to the metal and superior performance during high temperature processing, whereby it serves effectively as a support for the beam leads.

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