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US 5,670,446 AGranted
Sultine color-former compounds and their use in cabonless copy paper
AssigneeMinnesota Mining and Manufacturing Company
InventorsNusrallah Jubran, Alan R. Katritzky, Josef V. Ugro, Jr.
Life of this patent
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Abstract
This invention includes novel sultine compounds and the reaction of these compounds to form colored compounds. The invention also includes the use of these color-forming compounds in the manufacture and imaging of thermal imaging papers and pressure-sensitive imaging papers.
Claims12
An imaging construction comprising:
- a first substrate having a front and back surface;
- coated on at least one of the front and the back surfaces of the first substrate, a color-forming compound having the general formula:
- ##STR8## wherein R.sup.1, R.sup.2, and R.sup.3 are independently selected from the group consisting of hydrogen, alkyl groups of up to 20 carbon atoms, cycloalkyl groups of up to 20 carbon atoms, amino groups, and strongly electron donating groups, provided that at least one of R.sup.1, R.sup.2, and R.sup.3 is an amino group and at least one other of R.sup.1, R.sup.2, and R.sup.3 is a strongly electron donating group;
- a developer;
- and
- a means for separating the color-forming compound from the developer until the construction is subjected to activating pressure.
3 more elements
An imaging construction comprising:
- a first substrate having a front and back surface;
- coated on at least one of the front and the back surfaces of the first substrate, a color-forming compound having the general formula:
- ##STR9## wherein R.sup.1, R.sup.2, and R.sup.3 are independently selected from the group consisting of hydrogen, alkyl groups of up to 20 carbon atom, cycloalkyl groups of up to 20 carbon atoms, amino groups, and strongly electron donating groups, provided that at least one of R.sup.1, R.sup.2, and R.sup.3 is an amino group and at least one other of R.sup.1, R.sup.2, and R.sup.3 is a strongly electron donating group;
- a developer;
- and
- a means for separating the color-forming compound from the developer until the construction is subjected to heat.
3 more elements
Dependencies are inferred from the claim text.