Claims
- 1. A process for the production of metal-coated melamine/formaldehyde resin fibers by first pretreating their surface with a metal layer and then coating them with the desired metal, wherein, in the presence of melamine/formaldehyde resin fibers,
- (Ia) first a water-soluble cobalt, copper or nickel salt is reduced with a less noble metal or metal salt, or
- (Ib) first a water-soluble cobalt, copper or nickel salt is reduced with a hydride compound in the presence of a complexing agent, whereby the hydride compound is added until the pH of the solution has increased by from 1 to 2 units, (II) optionally, the fibers treated according to steps (Ia) or (Ib) are further reduced with a basic, aqueous reduction solution to transfer cobalt, copper or nickel in a low oxidation state to the metallic state, (III) and then the desired metal is applied to the fibers by reducing one of its water-soluble salts with a reducing agent in the presence of a complexing agent.
- 2. The process of claim 1, wherein a cobalt salt is used in steps (Ia) and (Ib).
- 3. The process of claim 1, wherein a copper salt is used in steps (Ia) and (Ib).
- 4. The process of claim 1, wherein a nickel salt is used in steps (Ia) and (Ib).
Priority Claims (1)
Number |
Date |
Country |
Kind |
41 25 601.8 |
Aug 1991 |
DEX |
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Parent Case Info
This is a divisional of application Ser. No. 08/137,490, filed Oct. 18, 1993, now abandoned, which is an FWC of Ser. No. 07/919,335, filed Jul. 27, 1992, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3329512 |
Shipley, Jr. et al. |
Jul 1967 |
|
3874882 |
Gulla et al. |
Apr 1975 |
|
4370214 |
Kadija |
Jan 1983 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
137490 |
Oct 1993 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
919335 |
Jul 1992 |
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