Electrochemical recording medium
AssigneeAlden Research Foundation
InventorSylvester Charles Sviokla
Life of this patent
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Abstract
An improved electrochemical recording medium is provided which comprises a support impregnated with an electrolytically conducting solution containing an electrolyte, a chelating or sequestering agent, and a marking compound; and characterized by the inclusion of a six-membered hetero-aromatic nitrogen-containing compound having at least one acidic substituant adjacent to a nitrogen atom of the hetero-aromatic ring. The hetero-aromatic compound unexpectedly provides improvement in color, tone and definition of recorded mark.
Claims13
In an electrolytic recording medium comprising a porous support impregnated with an electrolytically conducting aqueous solution of a strong electrolyte
- and a marking compound, the improvement comprising the addition of a six-membered hetero-aromatic nitrogen-containing compound of the formula:
- ##STR2## where each X is a member selected from the group consisting of nitrogen and carbon;
- and R is a member selected from the group consisting of hydrogen, halogen, hydroxyl, lower aliphatic radicals of 1-6 carbons, carboxyl, sulfo and alkoxy-radicals, said carboxyl, sulfo and alkoxy radicals being substituted with a member from the group consisting of hydrogen and lower aliphatic radicals of 1-6 carbons and m is a whole integer varying between 1 and 5.
In an improved method of electrolytic recording comprising passing a porous support between recording electrodes, said support being impregnated with an aqueous solurion comprising a strong electrolyte and a marking compound, the improvement comprising the addition to said aqueous solution of a six-membered hetero-aromatic nitrogen-containing compound of the formula:
- ##STR3## where each X is selected from the group consisting of nitrogen and carbon and R is selected from the group consisting of hydrogen, halogen, hydroxyl, lower aliphatic radicals of 1-6 carbons, carboxyl sulfo and alkoxy radicals, said carboxyl, sulfo and alkoxy radicals being substituted with a member from the group consisting of hydrogen and lower aliphatic radicals of 1-6 carbons, and m is a whole integer varying between 1 and 5.
Dependencies are inferred from the claim text.