US3923773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing isoindolenone pigments
Assignee: DIC Corp
•
Filing: 1973-04-25
•
Granted: 1975-12-02
•
Expires: 1993-04-25
Abstract
Abstract A method of preparing an isoindolenone pigment represented by the general formula WHEREIN X is a halogen atom, n is 0 or an integer of 1 - 4, and R is a direct bond, divalent aromatic residue or divalent heterocyclic residue, WHEREIN A COMPOUND REPRESENTED BY THE GENERAL FORMULA WHEREIN X, n and R are as defined above, is subjected to intramolecular dehydrocondensation.
Inventors
- 👤 Hirohito Ando
- 👤 Kunihiko Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:21
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A METHOD OF PREPARING AN ISOINDOLENONE PIGMENT OF THE FORMULA ((1-(O=),(X)N-ISOINDOLIN-3-YLIDENE)=N-)2-R WHEREIN X IS A HALOGEN ATOM, N IS A NUMBER FROM 0 TO 4, AND R IS A DIRECT BOND, OR DIVALENT RESIDUE OF ONE OF THE GROUP CONSISTING OF O-, M-, P-PHENYLENEDIAMINES, BENZIDINE, ODIANISIDINE, O-, M-TOLIDINES, 3,3''-DICHLOROBENZIDINE, 4,4''DIAMINODIPHENYL METHANE, 3,3''-DICHLORO-4,4''DIAMINODIPHENYL METHANE, 4,4''-DIAMINODIPHENYL ETHER, 1,5-DIAMINONAPHTHALENE, 2,2''-DIAMINODIPHENYL, 2,6DIAMINOTOLUENE, 2,6-DIAMINOPYRIDINE, 2,6-DIAMINOBENZOTHIAZOLE, DIAMINOAZOBENZENE, N-(P''-AMINOPHENYL)PAMINOBENZAMIDE, OR 2,2''-DICHLOROBENZIDENE; COMPRISING THE STEP OF CONDENSING A COMPOUND OF THE FORMULA ((2-(H2N-CO-),(X)N-PHENYL)-CO-NH-)2-R WHEREIN X, N, AND R ARE AS DEFINED ABOVE, AT A TEMPERATURE OF FROM 60* TO 130*C. AND IN THE PRESENCE OF BOTH AN INERT ORGANIC SOLVENT AND AT LEAST 2 MOLS PER MOL OF THE ABOVE COMPOUND OF A CONDENSING AGENT.
Claim 2
Independent Claim
117 words
A METHOD OF PREPARING AN ISOINDOLENONE PIGMENT OF THE FORMULA ((1-(O=),(X)N-ISOINDOLIN-3-YLIDENE)=N-)2-R WHEREIN X IS A HALOGEN ATOM, N IS A NUMBER FROM 0 TO 4, AND R IS A DIRECT BOND, OR DIVALENT RESIDUE OF ONE OF THE GROUP CONSISTING OF O-, M-, P-PHENYLENEDIAMINES, BENZIDINE, ODIANISIDINE, O-, M-TOLIDINES, 3,3''-DICHLOROBENZIDINE, 4,4''DIAMINODIPHENYL METHANE, 3,3''-DICHLORO-4,4''DIAMINODIPHENYL METHANE, 4,4''-DIAMINODIPHENYL ETHER, 1,5-DIAMINONAPHTHALENE, 2,2''-DIAMINODIPHENYL, 2,6DIAMINOTOLUENE, 2,6-DIAMINOPYRIDINE, 2,6-DIAMINOBENZOTHIAZOLE, DIAMINOAZOBENZENE, N-(P''-AMINOPHENYL)PAMINOBENZAMIDE, OR 2,2''-DICHLOROBENZIDENE; COMPRISING THE STEP OF CONDENSING A COMPOUND OF THE FORMULA ((2-(H2N-CO-),(X)N-PHENYL)-CO-NH-)2-R WHEREIN X, N, AND R ARE AS DEFINED ABOVE, AT A TEMPERATURE OF FROM 60* TO 130*C. AND IN THE PRESENCE OF BOTH AN INERT ORGANIC SOLVENT AND AT LEAST 2 MOLS PER MOL OF THE ABOVE COMPOUND OF A CONDENSING AGENT.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein the heating is performed at a temperature ranging 70* to 80*C.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein benzene, toluene, xylene, chlorobenzenes, chloroethanes, nitrobenzene, decalin, or diphenylether is used as the inert organic solvent.
Claim 5
Dependent Claim
23 words
A method according to claim 1 wherein the condensing agent is present in from 3 to 4 mols per mol of the compound.
Claim 6
Dependent Claim
16 words
A method according to claim 1 wherein the condensation reaction takes from 0.5 to 4 hours.
Claim 7
Dependent Claim
16 words
A method according to claim 1 wherein the condensing agent is phosphorous pentachloride or phosphorous pentabromide.
Claim 8
Dependent Claim
12 words
A method according to claim 1 wherein X is chlorine or bromine.
Claim 9
Dependent Claim
24 words
A method according to claim 1 wherein R is the residue of one of the group comprising p-phenylenediamine, 2,6-diaminotoluene, benzidine, 2,2''-diaminodiphenyl, o-dianisidine, or diaminoazobenzene.
References Cited (Backward Citations)
US3496190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |