Patent ID: 6814850
Filing Date: 2004-11-09
Classification: C25D

Abstract:
An electrodeposition bath for depositing glossy gold and gold alloy layers, comprising gold and at least one gloss additive selected from the group consisting of pyridine-3-sulfonic acid, nicotinic acid, nicotinic acid amide, 3-(3-pyridyl)-acrylic acid, 3-(4-imidazolyl)-acrylic acid, 3-pyridylhydroxymethanesulfonic acid, pyridine, picoline, quinolinesulfonic acid, 3-aminopyridine, 2,3-diaminopyridine, 2,3-di-(2-pyridyl)-pyrazine, 2-(pyridyl)-4-ethanesulfonic acid, 1-(3-sulfopropyl)-pyridinium betaine, 1-(3-sulfopropyl)-isoquinolinium betaine and salts or derivatives thereof, and an additional gloss additive, of the general formulaRâ€”SOmâ€”Hâ€ƒâ€ƒ(I) wherein m is the number 3 or 4, and when m is 3, R represents a straight-chain or branched or cyclic alkyl group with up to 20 carbon atoms, and when m is 4, R represents a straight-chain or branched or cyclic alkyl group with up to 20 carbon atoms or an aryl or heteroaryl group with up to 10 carbon atoms optionally substituted once or several times with straight-chain or branched alkyl groups with 1 to 14 carbon atoms.