Global Patent Index - EP 1983077 B1

EP 1983077 B1 20161228 - ELECTROLYTE AND METHOD FOR ELECTROLYTIC DEPOSITION OF GOLD-COPPER ALLOYS

Title (en)

ELECTROLYTE AND METHOD FOR ELECTROLYTIC DEPOSITION OF GOLD-COPPER ALLOYS

Title (de)

ELEKTROLYT UND VERFAHREN ZUR ELEKTROLYTISCHEN ABLAGERUNG VON GOLD-KUPFER-LEGIERUNGEN

Title (fr)

ÉLECTROLYTE ET PROCÉDÉ POUR LE DÉPÔT ÉLECTROLYTIQUE D'ALLIAGES OR-CUIVRE

Publication

EP 1983077 B1 20161228 (EN)

Application

EP 07007963 A 20070419

Priority

EP 07007963 A 20070419

Abstract (en)

[origin: EP1983077A1] This invention relates to an electrolyte as well as a method for the deposition of a gold-copper alloy on a substrate surface. With the electrolyte and method disclosed, deposition of gold-copper alloys with a value of carat in the range of 12 to 19 kt is possible. Beneath a source of gold and copper, the inventive electrolyte comprises potassium cyanate (KCN) in a concentration capable to maintain a copper to KCN ratio in the range of 3 to 7, and at least one complexing agent of the group consisting of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, nitrilo-triacetic acid, ethylenediamine tetraacetic acid [EDTA], diethylenetriamine pentaacetic acid and nitrilo-triacetic acid [NTA] Hydroxyethyl imino diacetic acid [HEIDA], nitrilo propionic diacetic acid [NPDA], imino diacetic acid [IDA], nitrilo trimethylphosphoric acid [NTMA, Dequest 2000], triethanol amine [TEA].

IPC 8 full level

C25D 3/58 (2006.01); C25D 3/62 (2006.01)

CPC (source: EP)

C25D 3/58 (2013.01); C25D 3/62 (2013.01)

Citation (opposition)

Opponent : ICB Ingenieurs Conseils en Brevets SA

  • EP 0304315 A1 19890222 - ENGELHARD LTD [GB]
  • EP 0416342 A1 19910313 - DEGUSSA [DE]
  • EP 1103637 A1 20010530 - ENTHONE OMI INC [US]
  • EP 0566054 A1 19931020 - LEARONAL INC [US]
  • EP 1728898 A2 20061206 - ROHM & HAAS ELECT MAT [US]
  • EP 0384679 A1 19900829 - ENGELHARD CORP [US]
  • GB 1375611 A 19741127
  • H. P. ROTHBAUM: "The Composition of Copper Complexes in Cuprocyanide Solutions", JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 104, no. 11, November 1957 (1957-11-01), pages 682 - 686, XP055425845
  • I.-M. MIHAESCU: "Cyanide Determination with a modified Ninhydrin Reagent using N- Acetyl Cysteine in the presence of Heavy Metal Ions", J. CHIL. CHEM. SOC., vol. 55, no. 4, 2010, pages 467 - 468, XP055425848
  • C. POHLANDT: "A critical evaluation of methods applicable for the determination of cyanides", JOURNAL OF THE SOUTH AFRICAN INSTITUTE OF MINING AND METALLURGY, January 1983 (1983-01-01), pages 11 - 19, XP055425861
  • T. MICHALOWSKI: "Liebig-Deniges Method of Cyanide Determination: A comparative Study of Two Approaches", J. SOLUTION CHEM, vol. 41, 2012, pages 1224 - 1239, XP035094245

Designated contracting state (EPC)

CH IT LI

DOCDB simple family (publication)

EP 1983077 A1 20081022; EP 1983077 B1 20161228; CN 101289756 A 20081022; CN 101289756 B 20120620; EP 3170924 A1 20170524

DOCDB simple family (application)

EP 07007963 A 20070419; CN 200810093471 A 20080421; EP 16197251 A 20070419