Process for electroplating utilizing disubstituted ethane sulfonic compounds as electroplating auxiliaries and electroplating auxiliaries containing same

US5024736A · kind A · utility

Assignee

• RASCHIG GMBH · DE

Inventors

• Wolfgang Clauss · Niedernhausen, DE
• Werner Kurze · Schifferstadt, DE
• Ferdinand Leifeld · Kempen, DE
• Willy Wassenberg · Schifferstadt, DE

Key dates

• Filing date: May 24, 1989
• Grant date: Jun 18, 1991
• Expiry date: May 24, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/38
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process in which disubstituted ethane sulfonic compounds are employed as electroplating auxiliaries in electroplating. The compounds for use in combination with the claimed process have the general formula: ##STR1## wherein, A represents a pyridinium radical ##STR2## in which R.sub.1 and R.sub.2 denote hydrogen or an alkyl radical having 1 to 3 carbon atoms, or R.sub.1 and R.sub.2, together with the pyridinium radical, form a condensed six-membered aromatic ring; or, PA1 A represents a mercapto radical of the formula --S--R.sub.4, in which R.sub.4 denotes hydrogen or the group: ##STR3## and R.sub.3 is an alkyl group having 1 to 4 carbon atoms. Also included within the scope of the present invention are alkali or ammonium salts of the compounds of the foregoing structural formula.