Back to results
US 5,204,311 AGranted
Ethanediimidic acid bis[(arylalkylidene)hydrazide] color-formers
AssigneeMinnesota Mining and Manufacturing Company
InventorNusrallah Jubran
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeMinnesota Mining and Manufacturing Company
InventorNusrallah Jubran
Estimating the term…
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.
A composition capable of forming colored complexes with transition metal salts, said composition comprising an ethanediimidic acid bis[(arylalkylidene)hydrazide] compound carried in an organic cosolvent vehicle, said compound having the formula:
A construction comprising:
A method of forming an image on a receptor sheet;
The method according to claim 23 wherein said step of transferring comprises:
A microcapsule containing a composition capable of forming colored complexes with transition metal salts, said composition comprising an ethanediimidic acid bis[(arylalkylidene)hydrazide] compound carried in an organic cosolvent vehicle, said compound having the formula:
A composition capable of forming colored complexes with transition metal salts, said composition comprising an ethanediimidic acid bis[(arylalkylidene)hydrazide] compound carried in an organic cosolvent vehicle, said compound having the formula:
Dependencies are inferred from the claim text.