Aqueous precious metal preparations and their use for manufactur

Details Aqueous precious metal preparations and their use for manufactur Aqueous precious metal preparations and their use for manufactur

1995-02-22

1996-08-13

Lusignan, Michael

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156237, 427147, 428914, 428 418, 428 421, 524780, 524785, A61F 1302, E04F 1516

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055454526

ABSTRACT:
The invention relates to aqueous precious metal preparations and their use for manufacturing precious metal decorations.
Precious metal preparations are known for the manufacture of precious metal decorations on the basis of one or more precious metals from the series gold, silver, platinum and palladium, which have an organic or organic/aqueous solvent system. There is a need for preparations which are essentially free from organic solvents.
Preparations according to the invention contain a precious metal thiolate which has at least one functional group capable of salt formation, in the form of a water soluble salt, a water-soluble polymer organic binder, a surfactant in effective quantity and, as solvents, water and less than 2% by weight of organic solvents. Preferred preparations contain a gold thiolate of the formula Au--S--Q--COOH, Q standing for a divalent organic group optionally containing functional groups, polyvinylpyrrolidone and/or hydroxyethylcellulose as binders and as surfactant an alkylbenzene sulphonate or a polyether-polysiloxane copolymer in a quantity of 0.1 to 2.0% by weight.
High-gloss, speck-free decorations can be produced by using the preparations which are essentially free from organic solvents.

REFERENCES:
patent: 5401535 (1995-03-01), Bishop
Elvers, Ullmann's Encyclopedia of Industrial Chemistry, 5th Edition, vol. A 24 pp. 81-85 (1993).

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