Conrad T Johnson

US Patent:

H3255, Sep 1, 1987

Filed:

Nov 26, 1985

Appl. No.:

6/802078

Inventors:

Glenn O. Mallory - Los Angeles CA
Conrad E. Johnson - Santa Ana CA

Assignee:

Richardson Chemical Company

International Classification:

C23C 1838

US Classification:

106 123

Abstract:

Transition metals form a plated deposit in an electroless transition metal plating bath containing an organophosphorus complexing agent selected from the class of compounds having the general formulas: ##STR1## wherein R. sub. 1 is alkyl having from 1 to 5 carbon atoms, alkali metal and ammonium salts of said compounds, and ##STR2## wherein R. sub. 2 is ##STR3## R. sub. 3 is selected from the class consisting of R. sub. 2 and --CH. sub. 2 CH. sub. 2 OH, and R. sub. 4 is selected from the group consistiong of R. sub. 2, --CH. sub. 2 CH. sub. 2 OH, and ##STR4## wherein each M is independently selected from the group consisting of H, NH, and alkali metal, and "n" is an integer from 1 to 6 inclusive. These baths have unique properties, including the ability to be formulated to have selected operating pH values within a wide pH range and the ability to operate effectively at the selected pH value.