Color former composition and microcapsules containing the composition
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
Feb 7, 2000
filing date -
Feb 16, 1999
priority date (Note) -
Expired
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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.
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