Claims
- 1. A pressure-sensitive recording medium which produces a colored image comprising a support having provided thereon a substantially colorless electron donating dye precursor layer and an electron accepting developer layer, wherein the electron accepting developer layer contains a metal salt of a salicylic acid derivative and the electron donating dye precursor layer contains (a) an indolylazaphthalide compound represented by the following formula: ##STR7## wherein one of X and Y represents --N.dbd. and the other represents --CH.dbd., Z represents a hydrogen atom, a halogen atom, an alkyl group having from 1 to 8 carbon atoms, an alkoxy group having from 1 to 12 carbon atoms, an aryloxy group having from 6 to 18 carbon atoms, or an aralkyloxy group having from 7 to 8 carbon atoms, W represents a hydrogen atom or a halogen atom, R.sub.1 represents a hydrogen atom or an alkyl group having not more than 12 carbon atoms which is unsubmitted or substituted with a halogen atom, a hydroxyl group, a cyano group, or a lower alkoxy group, R.sub.2 represents a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms; or a phenyl group, R.sub.3 and R.sub.4 each independently represents a hydrogen atom or an alkyl group, a cycloalkyl group having from 5 to 7 carbon atoms, a benzyl group, or a phenyl group which is unsubstituted or substituted with a halogen atom, a hydroxyl group, a cyano group, or a lower alkoxy group or R.sub.3 and R.sub.4 are combined to form a pyrrolidinyl group and (b) Crystal Violet lactone.
- 2. The pressure-sensitive recording medium as claimed in claim 1, wherein said aromatic carboxylic acid metal salt has a hydroxyl group in the ortho- or paraposition relative to the carboxyl group.
- 3. The pressure-sensitive recording medium as claimed in claim 2, wherein said aromatic carboxylic acid metal salt has a substituent in at least one of the other para-positions relative to the hydroxyl group which has a total number of carbon atoms of not less than 8.
- 4. The pressure-sensitive recording medium as claimed in claim 1, wherein the indolylazaphthalide and the Crystal Violet lactone are present in the electron donating dye precursor layer in the range from 5 parts indolylazaphthalide to 95 parts Crystal Violet lactone by weight to 90 parts indolylazaphthalide to 10 parts Crystal Violet lactone by weight.
- 5. The pressure-sensitive recording medium as claimed in claim 4, wherein one or more color formers other than the combination of indolylazaphthalide and the Crystal Violet lactone is present in the electron donating dye precursor layer, the indolylazaphthalide and the Crystal Violet lactone together being present in the electron donating dye precursor layer in an amount not less than 60 percent by weight of the total weight of the color formers present in the pressure-sensitive recording medium.
- 6. The pressure-sensitive recording medium as claimed in claim 5, wherein the amount of aromatic carboxylic acid metal salt present in the electron accepting developer layer is in the range of from 0.1 to 3.0 g/m.sup.2
- 7. The pressure-sensitive recording medium as claimed in claim 1, wherein the electron accepting developer layer is a support which is coated with a coating solution mixed with a binder, said coating solution comprising a dispersion or emulsion, or a mixture of a dispersion and an emulsion, of said aromatic carboxylic acid metal salt.
- 8. The pressure-sensitive recording medium as claimed in claim 7, said coating solution further comprising an inorganic pigment.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-173874 |
Jul 1986 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 077,828 filed July 27, 1987, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4295663 |
Petitpierre et al. |
Oct 1981 |
|
4508897 |
Bedekovic et al. |
Apr 1985 |
|
4688060 |
Tanaka et al. |
Aug 1987 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
2041303 |
Aug 1980 |
GBX |
2141729 |
Jan 1985 |
GBX |
2148923 |
Jun 1985 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
77828 |
Jul 1987 |
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