Radiation imagery chemistry: process – composition – or product th – Imaged product – Multilayer
Patent
1996-11-08
1997-12-23
Hamilton, Cynthia
Radiation imagery chemistry: process, composition, or product th
Imaged product
Multilayer
4302801, 430 18, 430 14, G03F 7027
Patent
active
057006075
ABSTRACT:
In a process for fabricating a multilayer printed circuit board with permanent innerlayers of photoresist, the photoimageable composition used to form the hard permanent layer comprises a polymerizable acrylate monomer; an oligomer formed by the reaction of an epoxy resin and an acrylic or methacrylic acid; a photosensitive, free radical generating initiator for polymerization of the acrylic monomer and oligomer; a curable epoxy resin; a curing agent for the epoxy resin; and, optionally, a crosslinking agent reactive with hydroxyl groups. After exposure and development of a layer of the photoimageable composition and etching of the underlying metal layer on a board, the resultant photoresist is left on the circuitry traces. The innerlayers of photoresist are stacked in a press where it initially conforms under heat and pressure to fill voids between the innerlayers and then cures to permanence.
REFERENCES:
patent: 5229252 (1993-07-01), Flynn et al.
Flynn Kathy M.
Koes Thomas A.
Nizzo Vincent J.
Rath James
Tara Vinai Ming
Didrick Robert M.
Hamilton Cynthia
Morton International Inc.
White Gerald K.
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