Colorant for use in business recording
AssigneeIndiana University Foundation
InventorsChester Davis, Ford P. Wilgis, Vernon J. Shiner, Jr.
Life of this patent
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Abstract
Bis-substituted methanes and undissociated methylene salts of the formula (Am).sub.2 Z wherein Am is bis-(1,4 dimethylaminophenyl) and Z is CH.sub.2 or CH.sup.+ X.sup.- wherein X.sup.- is a suitable anion, all useful in the production of deeply colored cations of the formula (Am).sub.2 CH.sup.+. These deeply colored cations are in turn useful in making and using carbonless copy papers, as well as thermal copying papers for use with fax machines.
Claims8
A compound of the formula ##STR3## wherein each R is dimethylamino and Z is CH.sub.2, or CH.sup.+ X.sup.- wherein X.sup.- is an anion.
As a new composition of matter, an intensely colored cation of the formula ##STR4## wherein each R Is dimethylamino.
The method of preparing a compound of the formula ##STR5## wherein each R is dimethlamino and wherein R is C.sub.1-8 straight-chain alkyl, phenyl or substituted phenyl wherein said substituents can be one to three members of the group lower alkyl, lower alkoxy and halo, which comprises reacting a solution of a tris (2,4-dimethylaminophenyl)-methane of the formula ##STR6## wherein each R is dimethylamino with a solution of an organic sulfinic acid, R.sup.1 SO.sub.2 H, whereby the sulfinate salt of the cation ##STR7## is formed, wherein each R is dimethylamino.
A compound of the formula ##STR8## wherein each R is dimethylamino.
Dependencies are inferred from the claim text.