US4055358A
Expired / Lapsed
US
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Nitro-phthalides, their manufacture and their use in recording systems
Assignee: Novartis Corp
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Filing: 1976-03-15
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Granted: 1977-10-25
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Expires: 1996-03-15
Abstract
Abstract Nitro-phthalides of the formula ##STR1## in which E is a radical of the formula ##STR2## X and X' each represents alkyl with 1 to 12 carbon atoms, alkoxy with 1 to 12 carbon atoms or acyloxy with 2 to 12 carbon atoms, and X may also be hydrogen. Z represents hydrogen, alkyl having 1 to 12 carbon atoms or phenyl, Y represents hydrogen, alkyl having 1 to 12 carbon atoms, benzyl or cyanoethyl, R 1 , R 2 , R 1 ' and R 2 ', independently of the other, represents hydrogen, alkyl with 1 to 12 carbon atoms, alkoxyalkyl with 2 to 8 carbon atoms, cycloalkyl with 5 or 6 carbon atoms, benzyl or phenyl and the benzene ring B may be further substituted by halogen, nitro or an amino group optionally substituted by alkyl with 1 to 6 carbon atoms. The nitro-phthalides are particularly useful as color formers which give intense green, blue-green or blue colors when they are brought into contact with an electron-accepting co-reactant.
Inventors
- 👤 Robert Garner
- 👤 Jean Claude Petitpierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:18
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24; C09B11/26
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
101 words
A nitro-phthalide of the formula ##STR23##wherein X 1 represents alkyl with 1 to 4 carbon atoms, alkoxy with 1 to 12 carbon atoms or alkanoyloxy with 2 to 4 carbon atoms, Z 1 represents hydrogen, alkyl with 1 to 4 carbon atoms or phenyl, Y 1 represents hydrogen, benzyl or alkyl with 1 to 12 carbon atoms, R 3 and R 4 each represents hydrogen, alkyl with 1 to 12 carbon atoms or benzyl and B 1 represents hydrogen, chlorine, nitro, amino, mono- or dialkylamino with 1 to 4 carbon atoms in each alkyl part and mixtures of nitro isomers thereof.
Claim 2
Dependent Claim
101 words
A nitro-phthalide of the formula ##STR23##wherein X 1 represents alkyl with 1 to 4 carbon atoms, alkoxy with 1 to 12 carbon atoms or alkanoyloxy with 2 to 4 carbon atoms, Z 1 represents hydrogen, alkyl with 1 to 4 carbon atoms or phenyl, Y 1 represents hydrogen, benzyl or alkyl with 1 to 12 carbon atoms, R 3 and R 4 each represents hydrogen, alkyl with 1 to 12 carbon atoms or benzyl and B 1 represents hydrogen, chlorine, nitro, amino, mono- or dialkylamino with 1 to 4 carbon atoms in each alkyl part and mixtures of nitro isomers thereof.
Claim 3
Dependent Claim
23 words
A nitro-phthalide according to claim 1, wherein the nitro group of the phthalic anhydride residue is in the 4-, 5-, 6- or 7-position.
Claim 4
Dependent Claim
27 words
A nitro-phthalide according to claim 1, which is a mixture of two isomers, wherein the nitro groups of the phthalic anhydride residue are in 4- and 7-positions.
Claim 5
Dependent Claim
27 words
A nitro-phthalide according to claim 1, which is a mixture of two isomers, wherein the nitro groups of the phthalic anhydride residue are in 5- and 6-positions.
Claim 6
Dependent Claim
54 words
A nitro-phthalide according to claim 1, of the formula ##STR24##wherein X 3 is alkoxy with 1 to 4 carbon atoms, Z 3 is methyl, ethyl or phenyl, Y 3 is alkyl with 1 to 12 carbon atoms and R 5 and R 6 each is alkyl with 1 to 4 carbon atoms or benzyl.
Claim 7
Dependent Claim
34 words
A nitro-phthalide according to claim 5, of the formula ##STR25##in which X 4 is ethoxy or propoxy, Z 4 is methyl or phenyl and Y 4 is alkyl with 1 to 8 carbon atoms.
Claim 8
Dependent Claim
29 words
A nitro-phthalide according to claim 1, which is a mixture of the two isomers defined by the formula ##STR26##wherein one W is nitro and the other W is hydrogen.
Claim 9
Dependent Claim
29 words
A nitro-phthalide according to claim 1, which is a mixture of the two isomers defined by the formula ##STR27##wherein one W is nitro and the other W is hydrogen.
Claim 10
Dependent Claim
29 words
A nitro-phthalide according to claim 1, which is a mixture of the two isomers defined by the formula ##STR28##wherein one W is nitro and the other W is hydrogen.
Claim 11
Dependent Claim
29 words
A nitro-phthalide according to claim 1, which is a mixture of the two isomers defined by the formula ##STR29##wherein one W is nitro and the other W is hydrogen.
Claim 12
Dependent Claim
18 words
Pressure-sensitive copying paper system containing included in its colour-reactant system a colour former as defined in claim 1.
Claim 13
Dependent Claim
53 words
A pressure-sensitive copying paper system according to claim 11, which comprises at least a colour former dissolved in an organic solvent and an electron accepting substance, said colour former upon coming into contact with the electron accepting substance being able to produce a coloured marking at the points where the pressure is applied.
Claim 14
Dependent Claim
23 words
A pressure-sensitive copying paper system according to claim 12, wherein the colour former dissolved in an organic solvent is contained in pressure-rupturable microcapsules.
Claim 15
Dependent Claim
24 words
A pressure-sensitive copying paper system according to claim 12, wherein the solid accepting substance is attapulgus clay, silton clay, silica or a phenyl-formaldehyde resin.
Claim 16
Dependent Claim
39 words
A pressure-sensitive copying paper system according to claim 12, 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.
Claim 17
Dependent Claim
22 words
A pressure-sensitive copying paper system according to claim 11, wherein the colour former is co-encapsulated with one or more other colour formers.
Claim 18
Dependent Claim
34 words
A process for making copies with a pressure-sensitive copying paper containing microcapsules, and an electron acceptor, each capsule containing a colour former, wherein the colour former is a nitro-phthalide as defined in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |