Process for producing product having patterned metal layer
First Claim
1. The process for forming a composite product which comprises applying to a base a layer of a photosensitive resin, exposing said resin to actinic light in a pattern to form a solvatable resin and a patterned nonsolvatable resin, removing solvatable resin by contacting said solvatable resin with a solvent for the solvatable resin, chemically modifying said patterned resin to render the surface of said resin receptive to a catalyst capable of promoting electroless metal deposition without chemically modifying said base, contacting said chemically modified patterned resin with a catalyst composition capable of promoting electroless metal deposition, thereby to absorb said catalyst on said patterned layer, rinsing said patterned resin and said base to remove excess loose catalyst therefrom, converting said absorbed metal catalyst to an electrolytically active form capable of causing electroless metal deposition and electrolessly depositing a metal layer on said patterned resin selectively without effecting electroless deposition of said metal layer on said base.
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Accused Products
Abstract
A multilayered composite product useful as an electrical circuit is produced by coating a base with a photoimagable resin free of catalyst or catalyst activator for electroless metal deposition. The resin is patterned by exposure to a desired light, through a mask followed by development. The patterned cured resin is selectively chemically modified while avoiding chemical modification of the base to render the cured resin receptive to a metal catalyst. The metal catalyst which promotes subsequent electroless metal deposition is selectively absorbed on the patterned cured resin and is converted to a catalytically active form. A conductive metal then is deposited selectively on the catalyst-containing patterned cured resin.
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29 Claims
- 1. The process for forming a composite product which comprises applying to a base a layer of a photosensitive resin, exposing said resin to actinic light in a pattern to form a solvatable resin and a patterned nonsolvatable resin, removing solvatable resin by contacting said solvatable resin with a solvent for the solvatable resin, chemically modifying said patterned resin to render the surface of said resin receptive to a catalyst capable of promoting electroless metal deposition without chemically modifying said base, contacting said chemically modified patterned resin with a catalyst composition capable of promoting electroless metal deposition, thereby to absorb said catalyst on said patterned layer, rinsing said patterned resin and said base to remove excess loose catalyst therefrom, converting said absorbed metal catalyst to an electrolytically active form capable of causing electroless metal deposition and electrolessly depositing a metal layer on said patterned resin selectively without effecting electroless deposition of said metal layer on said base.
Specification