Claims
- 1. A pressure-sensitive copying material containing a support coated with a color forming fluoran compound of the formula ##STR17## wherein R.sub.1 and R.sub.2 represent alkyl of 1 to 4 carbon atoms, R.sub.3 represents n-alkyl of 8 to 12 carbon atoms and R.sub.4 represents hydrogen, n-alkyl of 6 to 12 carbon atoms or benzyl.
- 2. A pressure-sensitive copying material according to claim 1, comprising said color forming fluoran dissolved in an organic solvent, and said material also comprising a solid electron accepting substance.
- 3. A pressure-sensitive copying material according to claim 2, wherein the solid accepting substance is attapulgus clay, silton clay, silica or a phenol-formaldehyde resin.
- 4. A pressure-sensitive recording material according to claim 1, wherein the fluoran compound is encapsulated in microcapsules.
- 5. A pressure-sensitive copying material according to claim 4, wherein the encapsulated colour former is coated on the back side of a transfer sheet and the electron accepting substance is coated on the front side of a receiving sheet.
- 6. A process for making copies with a pressure-sensitive copying material, wherein said material is a copying material according to claim 1.
- 7. A thermoreactive copying material having a support coated with at least one binder layer and containing an electron accepting substance and a color forming fluoran compound of the formula ##STR18## wherein R.sub.1 and R.sub.2 represent alkyl of 1 to 4 carbon atoms, R.sub.3 represents n-alkyl of 8 to 12 carbon atoms and R.sub.4 represents hydrogen, n-alkyl of 6 to 12 carbon atoms or benzyl.
- 8. A thermoreactive copying material according to claim 7, which contains the fluoran compound and the electron accepting substance in at least one binder layer on paper.
Priority Claims (1)
Number |
Date |
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24079/73 |
May 1973 |
GBX |
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CROSS REFERENCE TO RELATED APPLICATIONS
This is a Divisional of application Ser. No. 944,219 filed on Sept. 20, 1978 (now abandoned), which is a continuation-in-part of patent application Ser. No. 822,477, filed Aug. 8, 1977 (now abandoned), which is a continuation of U.S. application Ser. No. 670,780 filed Mar. 26, 1976 (now abandoned), which is in turn a continuation of U.S. application Ser. No. 471,269 filed May 20, 1974 (now abandoned).
US Referenced Citations (7)
Non-Patent Literature Citations (1)
Entry |
Ioffe et al., Jour. Org. Chem., U.S.S.R., vol. 6(2), Feb. 1970, pp. 356-358. |
Divisions (1)
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Date |
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Parent |
944219 |
Sep 1978 |
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Continuations (2)
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Date |
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670780 |
Mar 1976 |
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Parent |
471269 |
May 1974 |
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Continuation in Parts (1)
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Date |
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822477 |
Aug 1977 |
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