Method of improving the tarnish resistance of silver

Details Method of improving the tarnish resistance of silver Method of improving the tarnish resistance of silver

1973-02-21

1977-02-01

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

106 3, 252389R, 252395, C09D 508

Patent

active

040060268

ABSTRACT:
The tarnish resistance of silver and silver alloy surfaces can be improved by brief contact in a liquid medium with compounds of quadrivalent tin bound by at least one valence to alkyl having 2 to 22 carbon atoms, and by the remaining valences to sulfur, the tin compounds being of the formulas ##STR1## IN SAID FORMULAS R.sub.1, R.sub.2, and R' being alkyl having 2 to 22 carbon atoms, R" being alkyl having 4 to 22 carbon atoms or --CH.sub.2 COOR.sub.3, R.sub.3 being alkyl having 1 to 22 carbon atoms, and n being 1, 2, or 3.

REFERENCES:
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patent: 2841501 (1958-07-01), Murphy
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patent: 3330672 (1967-07-01), Kroll et al.
patent: 3398003 (1968-08-01), Smith et al.
patent: 3410703 (1968-11-01), Kroll et al.
patent: 3615305 (1971-10-01), Muhler
patent: 3631082 (1971-12-01), Kino et al.
patent: 3660442 (1972-05-01), Ludwig

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