Patent ID: 8557100

Claim:
A method for depositing an electroless metal or metal alloy on a substrate for substantially avoiding co-deposition of non-metallic particles comprising, plating the substrate with metal or metal alloy while rendering an anionic character to either or both of the non-metallic particles and the plating surface of the substrate in an autocatalytic plating bath, the plating bath having at least one reaction product additive from a mixture produced from the sulfation and esterification of a fatty acid or mixtures and salts thereof, wherein the at least one reaction product additive is represented by the formula wherein R 1 is selected from the group consisting of OH, OCH 3 , OCH 2 CH 3 , C 1 -C 7 alkyl, linear or branched; R 2 is selected from the group consisting of H and C 1 -C 7 alkyl, linear or branched; m is an integer ranging from 1 to about 5; n is an integer ranging from 2 to about 30; o is an integer ranging from 0 to about 10; M+ is a metal or pseudo metal ion or H + , and the plating bath having a zeta potential between −40 and −150 mV.