METALLIC SALTS WHICH ARE DIFFICULT TO DISSOLVE IN WATER, A PROCESS FOR THEIR PRODUCTION, AND THEIR USE AS BRIGHTENERS IN ELECTROLYTIC METAL DEPOSITION

摘要

PCT No. PCT/EP97/01389 Sec. 371 Date Sep. 16, 1998 Sec. 102(e) Date Sep. 16, 1998 PCT Filed Mar. 20, 1997 PCT Pub. No. WO97/35840 PCT Pub. Date Oct. 2, 1997The slightly water-soluble metal salts having the formula I wherein R1 and R2 are the same or different and represent hydrogen or a lower alkyl group of from 1 to 3 carbon atoms, M is the cation of a metal which forms slightly water-soluble sulfides, and n means 1 or 2, and mixtures thereof are prepared by reacting carbon disulfide with ketones having the formula II: optionally with the addition of non-aqueous inert solvents, in the presence of strong alkali, preferably potassium hydroxide, followed by precipitation of the slightly water-soluble metal salts of formula I by the addition of aqueous solutions of metal salts of the metals M. They are used as gloss additives to electrolytic baths.