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1. US20070095249 - Electroless gold plating liquid

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Claims

1. An electroless gold plating liquid comprising a non-cyanide gold salt as a gold salt, an alkali metal salt or an ammonium salt of sulfurous acid and thiosulfuric acid as a complexing agent for gold, a hydroxyalkylsulfonic acid or a salt thereof represented by the following general formula as a reducing agent, and an amine compound,

( MOL) ( CDX)
wherein R represents hydrogen, a carboxyl group, or any of a phenyl group, a tolyl group, a naphthyl group, a saturated or unsaturated alkyl group, an acetyl group, an acetonyl group, a pyridyl group and a furyl group which may have a substitutional group, X represents any of hydrogen, Na, K, and NH4, and n is an integer between 0 and 4.
2. An electroless gold plating liquid according to claim 1, wherein the reducing agent represented by said general formula is sodium hydroxymethanesulfonate.
3. An electroless gold plating liquid according to claim 1, wherein the non-cyanide gold salt is sodium gold sulfite.
4. An electroless gold plating liquid according to claim 1, wherein said amine compound is ethylenediamine or glycine.