Patent ID: 6048585
Filing Date: 2000-04-11
Classification: C23C

Abstract:
A non-sulfate containing electroless nickel bath consisting essentially ofa) hypophosphite ion,b) nickel ion,c) alkali metal or alkaline earth metal ion,d) an ion derived from an alkyl sulfonic acid, the ion of the formula: ##STR2## where: a, b and c each independently is an integer from 1 to 3;y is an integer from 1 to 3;R"" is hydrogen, or lower alkyl that is unsubstituted or substituted by oxygen, Cl, F, Br or I, CF.sub.3 or --SO.sub.2 OH;R and R' each independently is hydrogen, Cl, F, Br, I; CF.sub.3 or lower alkyl that is unsubstituted or substituted by oxygen, Cl, F, Br, 1, CF.sub.3 or --SO.sub.2 OH;and the sum of a+b+c+y=4; ande) optionally, buffers, stabilizers, complexing agents, chelating agents, accelerators, inhibitors or brighteners, wherein the alkali metal or alkaline earth metal ion is calcium introduced as a salt with the hypophosphite ion or sulfonic acid ion.