Patent ID: 7988773

Claim:
An electroless gold plating bath, comprising a water-soluble gold compound, a complexing agent, an aldehyde compound, and an amine compound represented by the following general formula (1) or (2): R 1 —NH—C 2 H 4 —NH—R 2 (1) R 3 —(CH 2 —NH—C 2 H 4 —NH—CH 2 ) n —R 4 (2) wherein in the formulas (1) and (2), R 1 , R 2 , R 3 and R 4 represent —OH, —CH 3 , —CH 2 OH, —C 2 H 4 OH, —CH 2 N(CH 3 ) 2 , —CH 2 NH(CH 2 OH), —CH 2 NH(C 2 H 4 OH), —C 2 H 4 NH(CH 2 OH), —C 2 H 4 NH(C 2 H 4 OH), —CH 2 N(CH 2 OH) 2 , —CH 2 N(C 2 H 4 OH) 2 , —C 2 H 4 N(CH 2 OH) 2 or —C 2 H 4 N(C 2 H 4 OH) 2 and may be the same or different, and n is an integer of 1 to 4.