Sensitized substrates for chemical metallization
AssigneePhotocircuits Division of Kollmorgan Corporation
InventorFrancis J. Nuzzi
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Abstract
A process for the production of metallized bodies, such as printed circuits, dials, nameplates, metallized plastics, glass, ceramics and the like, comprising treating a base with a composition comprising a metal salt reducible to catalytically active metal nuclei and a secondary reducing agent, and thereafter exposing the base to a primary chemical reducing agent to produce a layer of metal nuclei on the surface of the base. Exposing the sensitized base to an electroless metal deposition solution causes electroless metal to deposit on the nuclei.
Claims37
A process for the production of an article catalytic to the electroless deposition of metal comprising the steps of:
- a. treating a substrate with a liquid comprising the admixture of a reducible salt of a non-noble metal capable of catalyzing electroless metal deposition and at least one secondary reducing agent selected from the group consisting of formaldehyde and its precursors or derivatives;
- and
- b. contacting the treated substrate of step (a) with a primary reducing agent comprising at least one member of the group consisting of borohydrides and borones, thereby rendering said substrate catalytic to the deposition of metal from an electroless metal deposition bath.
A process for the production of an article catalytic to the electroless deposition of metal comprising the steps of:
- a. treating a substrate with a liquid comprising the admixture of:
- 1. a reducible salt of at least one metal selected from the group consisting of copper, nickel, cobalt and iron;
- and
- 2. at least one secondary reducing agent selected from the group consisting of formaldehyde and its precursors or derivatives;
- and
- b. contacting the treated substrate of step (a) with a primary reducing agent comprising at least one member of the group consisting of borohydrides and boranes thereby rendering said substrate catalytic to the deposition of metal from an electroless metal deposition bath.
A process for the production of an article catalytic to the electroless deposition of metal comprising the steps of:
- a. treating a substrate with a liquid comprising the admixture of:
- 1. a reducible salt of at least one metal selected from the group consisting of copper, nickel, cobalt and iron;
- and
- 2. at least one secondary reducing agent selected from the group consisting of formaldehyde, paraformaldehyde, trioxane, dimethylhydantoin and glyoxal;
- and
- b. contacting the treated substrate of step (a) with a primary reducing agent comprising at least one member of the group consisting of borohydrides and boranes thereby rendering said substrate catalytic to the deposition of metal from an electroless metal deposition bath.
A process for the production of an article catalytic to the electroless deposition of metal comprising the steps of:
- a. treating a substrate with a liquid comprising the admixture of:
- 1. a reducible salt of at least one metal selected from the group consisting of copper, nickel, cobalt and iron;
- and
- 2. at least one secondary reducing agent selected from the group consisting of formaldehyde, paraformaldehyde and glyoxal, wherein said liquid has a pH of from about 4.4 to about 9.5;
- and
- b. contacting the treated substrate of step (a) with a primary reducing agent comprising at least one member of the group consisting of borohydrides and boranes, thereby rendering said substrate catalytic to the deposition of metal from an electroless metal deposition bath.
A process for the production of an article catalytic to the electroless deposition of metal comprising the steps of:
- a. treating a substrate with a liquid comprising the admixture of:
- 1. a reducible copper salt;
- 2. a complexing agent for copper;
- and
- 3. at least one secondary reducing agent selected from the group consisting of formaldehyde, paraformaldehyde and glyoxal, wherein said liquid has a pH of from about 4.4 to about 9.5;
- and
- b. contacting the treated substrate of step (a) with a primary reducing agent comprising at least one member of the group consisting of borohydrides and boranes thereby rendering said substrate catalytic to the deposition of metal from an electroless metal deposition bath.
Dependencies are inferred from the claim text.