Method for preventing rusting in silver by using novel imidazole

Details Method for preventing rusting in silver by using novel imidazole Method for preventing rusting in silver by using novel imidazole

1983-01-24

1984-09-04

Padgett, Benjamin R.

Compositions

Preservative agents

Anti-corrosion

422 7, C23F 1116

Patent

active

044696221

ABSTRACT:
Disclosed is an imidazole-4(5)-dithiocarboxylic acid compound represented by the following general formula: ##STR1## wherein R.sub.2 stands for a hydrogen atom or a monovalent hydrocarbon group having up to 20 carbons, R.sub.4 stands for a hydrogen atom or an alkyl group having up to 4 carbon atoms, and X stands for a hydrogen atom or an alkali metal atom.
This compound has an excellent rust preventive action to silver. This compound is prepared according to a process which comprises reacting an imidazole compound represented by the following general formula: ##STR2## wherein R.sub.2 and R.sub.4 are as defined above, with carbon disulfides and an alkali metal hydroxide in the presence of a solvent, and if necessary, acidifying the obtained imidazole compound.

REFERENCES:
patent: 2785126 (1957-03-01), Scott et al.
patent: 3772315 (1973-11-01), Regel et al.
patent: 4357396 (1982-11-01), Grunewalder et al.
patent: 4394511 (1983-07-01), Sawa et al.
Kurata et al., Chemical Abstracts, vol. 93, No. 71509d, (1980).

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