Abstract: A color former composition which is composed of a mixture of the color formers 3-diethylamino-6-methyl-7-(2′,4′-dimethylanilino)fluoran and 3-dibutylamino-6-methyl-7-anilinofluoran in defined amounts. Further compositions contain mixtures of color formers including one or both of these fluoran compounds and the color formers 3-dibutylamino-6-methyl-7-anilinofluoran and/or 3-diethylamino-6-methyl-7-(3′-methylanilino)fluoran. Microcapsules containing the color former compositions can be prepared from a composition which also contains an organic solvent and can be used to prepare a pressure sensitive or thermal recording material. The mixture of color formers can provide a higher concentration in various organic solvents and/or can be used with less expensive solvents.
Type:
Grant
Filed:
February 7, 2000
Date of Patent:
April 17, 2001
Assignees:
ESCO Company, Yamamoto Chemicals, Inc.
Inventors:
Francis R. Kearney, Sean L. Daly, Darrel E. Cardy