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US 4,284,666 AGranted
Process for metal deposition of a non-conductor substrate
OwnerNathan Feldsteininventor
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Abstract
A process for the preparation of non-conductors prior to electroless metal plating with a catalyst composition. The catalyst formulation comprises the product resulting from the admixture of an acid, a nucleophillic reactant, stannous ions, a hydrolyzable stannic compound, and precious metal ions. The stannous ions are in a molar excess relative to either the stannic compound or the precious metal ions.
Claims8
A process for the electroless metal deposition of a non-conductor substrate comprising the steps of:
- (1) contacting said substrate with a catalytic colloidal composition prepared by
- (a) admixing
- 1. stannous ions in a molar concentration excess to precious metal ions and in a molar concentration excess to readily hydrolyzable stannic ion, with
- 2. precious metal ions, and
- 3. a readily hydrolyzable stannic compound which upon heating results in the conversion of the stannic ions to colloidal aged tin(IV) which imparts a colloidal nature to said composition and further wherein the readily hydrolyzable stannic compound is derived from an extraneous source, and
- 4. an acid, and
- (b) exposing said admixture to thermal energy whereby converting the stannic ions in said readily hydrolyzable stannic compound to said colloidal aged tin(IV), and in addition said colloidal composition further contains a reducing agent in an inactive state, and
- (2) contacting the treated substrate with an electroless plating bath.
5 more elements
Dependencies are inferred from the claim text.