Claims
- 1. A pressure-sensitive or heat-sensitive recording material which comprises a support which contains, or on which is coated, at least one 3,3-bisindolyl-4-azaphthalide of the formula ##STR11## wherein Y.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or is C.sub.1 -C.sub.12 acyl, benzyl or benzyl substituted by haogen, nitro, lower alkyl or lower alkoxy,
- Y.sub.2 is C.sub.6 -C.sub.9 alkyl, which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, and
- Z.sub.1 and Z.sub.2, each independently of the other, are hydrogen, lower alkyl or phenyl, and
- the rings A and B, each independently of the other, are unsubstituted or substituted by halogen, nitro, cyano, lower alkyl, lower alkoxy, lower alkoxycarbonyl, amino, mono-lower alkylamino or di-lower alkylamino.
- 2. The pressure-sensitive recording material of claim 1, wherein the 3,3-bisindolyl-4-azaphthalide is dissolved in an organic solvent, and which recording material further comprises at least one solid electron acceptor.
- 3. The pressure-sensitive recordng material of claim 2, wherein the 3,3-bisindolyl-4-azaphthalide is encapsulated in microcapsules.
- 4. The pressure-sensitive recording material of claim 3, wherein the encapsulated 3,3-bisindolyl-4-azaphthalide is present in the fom of a layer on the back of a transfer sheet and the electron acceptor is present in the form of a layer on the face of a receiving sheet.
- 5. The pressure-sensitive recording material of claim 1, which comprises the 3,3-bisindolyl-4-azaphthalide together with one or more other color formers.
- 6. The heat-sensitive recording material of claim 1, which comprises in at least one layer, at least one 3,3-bisindolyl-4-azaphthalide color former, at least one electron acceptor and at least one binder.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2524/83 |
May 1983 |
CHX |
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Parent Case Info
This is a divisional of application Ser. No. 605,948 filed on May 1, 1984, now U.S. Pat. No. 4,587,343, issued May 6, 1986.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
054277 |
Jun 1982 |
EPX |
0120495 |
Jul 1982 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
605948 |
May 1984 |
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