Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Method of use – kit – or combined with marking instrument or...
Patent
1991-08-23
1993-04-20
Schwartz, Pamela R.
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Method of use, kit, or combined with marking instrument or...
106 21R, 4284022, 503215, 503217, 503225, B41M 5132, B41M 5165
Patent
active
052043118
ABSTRACT:
This invention relates to improved imaging systems based on the formation of yellow colored coordination compounds of transition metals with certain ligands. The formation of colored coordination compounds can be employed to generate images and is important in the manufacture and use of pressure sensitive transfer papers for preparing carbonless copies. In particular, this invention relates to certain ethanediimidic acid bis[(arylalkylidene)hydrazide] compounds, and particularly to certain ethanediimidic acid bis[(o-hydroxyarylalkylidene)hydrazide] compounds, to their coordination compounds with certain transition metals, and to their use in pressure sensitive carbonless copy paper systems. These compounds have been found to provide excellent yellow colors when used in pressure sensitive carbonless copy-papers wherein the image is formed by the reaction of a color-forming compound with transition metal salts such as those of nickel, cobalt, iron, copper, and similar materials. These yellow color-formers have the advantage of greater solubility in encapsulation solvents and lower volatility than previously used yellow color-formers.
The invention also concerns the admixture of these certain color-formers with N-(monosubstituted)dithiooxamides and/or N,N'-(disubstituted)dithiooxamides to form images of various colors and preferably black images during the application of appropriate pressure to pressure sensitive imaging constructions such as carbonless paper constructions.
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Griswold Gary L.
Kirn Walter N.
Litman Mark A.
Minnesota Mining and Manufacturing Company
Schwartz Pamela R.
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