US5151129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of pigments in the presence of an azo dyestuff
Assignee: BASF Corp
•
Filing: 1991-03-28
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Granted: 1992-09-29
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Expires: 2011-03-28
Abstract
Abstract A process for the production of a pigment composition comprising precipitating a pigment coupling component from alkaline solution by adding to it an acid, in the presence of a pre-formed, water-soluble azo dyestuff; and subsequently coupling the precipitated coupling component, containing the azo dyestuff, with a pigment diazo or tetrazo component, ensuring that at no time is any substantial amount of uncoupled diazo or tetrazo component present, to form a pigment composition containing the water-soluble azo dyestuff.
Inventors
- 👤 Donald J. Morrison
- 👤 David McGregor
- 👤 James M. McCrae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:02
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/006; C09B67/0033; C09B67/0046; C09B41/00; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
77 words
A process for the production of a pigment composition comprising precipitating a pigment coupling component from alkaline solution by adding to it an acid, in the presence of a pre-formed, water-soluble azo dyestuff; and subsequently coupling the precipitated coupling component, containing the azo dyestuff, with a pigment diazo or tetrazo component, ensuring that at no time is any substantial amount of uncoupled diazo or tetrazo component present, to form a pigment composition containing the water-soluble azo dyestuff.
Claim 2
Dependent Claim
77 words
A process for the production of a pigment composition comprising precipitating a pigment coupling component from alkaline solution by adding to it an acid, in the presence of a pre-formed, water-soluble azo dyestuff; and subsequently coupling the precipitated coupling component, containing the azo dyestuff, with a pigment diazo or tetrazo component, ensuring that at no time is any substantial amount of uncoupled diazo or tetrazo component present, to form a pigment composition containing the water-soluble azo dyestuff.
Claim 3
Dependent Claim
30 words
A process according to claim 1 wherein an aqueous alkaline solution of the pigment coupling component is added to an aqueous solution containing the acid and the pre-formed azo dyestuff.
Claim 4
Dependent Claim
33 words
A process according to claim 1 wherein an aqueous alkaline solution of the coupling component and the pre-formed azo dyestuff is added to an aqueous solution of the acid, or mixture of acids.
Claim 5
Dependent Claim
33 words
A process according to claim 1 wherein an aqueous solution of the acid or mixture of acids, is added to an aqueous alkaline solution of the coupling component and the pre-formed azo dyestuff.
Claim 6
Dependent Claim
37 words
A process according to claim 1 wherein an aqueous solution of the preformed azo dyestuff in the acid or in a mixture of the acid is added to an aqueous alkaline solution of the pigment coupling component.
Claim 7
Dependent Claim
42 words
A process according to claim 1 wherein, during the step of precipitating the pigment coupling component from alkaline solution in the presence of preformed azo dyestuff, the pH value of the precipitation mixture is in the range of from 5 to 6.5
Claim 8
Dependent Claim
53 words
A process according to claim 1 wherein, during the step of coupling the pigment coupling component/azo dyestuff mixture with the pigment diazo or tetrazo component, the pH value of the coupling reaction mixture is within the range of from 3.5 to 5.5, while avoiding the presence of excess uncoupled diazo or tetrazo compound.
Claim 9
Dependent Claim
24 words
A process according to claim 7 wherein the pH value of the coupling reaction mixture is within the range of from 4.0 to 5.0.
Claim 10
Dependent Claim
31 words
A process according to claim 1 wherein the pigment is an arylamide yellow pigment, a beta-naphthol red pigment, an arylamide red pigment, an azo metal salt pigment or a diarylide pigment.
Claim 11
Dependent Claim
14 words
A process according to claim 9 wherein the pigment is a diarylide yellow pigment.
Claim 12
Dependent Claim
32 words
A process according to claim 10 wherein the diarylide yellow pigment is Pigment Yellow 12, Pigment Yellow 13, Pigment Yellow 14, Pigment Yellow 17 or Pigment Yellow 83, or mixtures of these.
Claim 13
Dependent Claim
16 words
A process according to claim 1 wherein the azo dyestuff is a mono or bisazo dyestuff.
Claim 14
Dependent Claim
14 words
A process according to claim 12 wherein the azo dyestuff is a bisazo dyestuff.
Claim 15
Dependent Claim
127 words
A process according to claim 12 wherein the monoazo dyestuff has the formula I: ##STR6## in which A is a residue of formula II or III: ##STR7## in which X, Y and Z are the same or different and each is H, CO 2 H, SO 3 H, Cl, Br, NO 2 , NH 2 , alkyl, aryl, alkoxy or aryloxy provided that at least one of X, Y and Z is CO 2 H or SO 3 H; and m, n and p are the same or different and each is 1, 2, 3, 4 or 5; and provided that when m, n or p, respectively, are 2, 3, 4 or 5, then individual substituents X, Y and Z, respectively, may be the same or different.
Claim 16
Dependent Claim
45 words
A process according to claim 14 wherein the monoazo dyestuff of formula I is that obtained by coupling acetoacetanilide onto aniline-p-sulphonic acid, o-nitroaniline-p-sulphonic acid, aniline-p-carboxylic acid or o-chloroaniline-p-carboxylic acid; or by coupling acetoacet-p-sulphoanilide onto aniline, p-nitroaniline or o-chloroaniline; or by coupling 2-naphthol onto aniline-p-sulphonic acid.
Claim 17
Dependent Claim
206 words
A process according to claim 12 wherein the bisazo dyestuff has the formula IV: ##STR8## wherein B and B 1 are the same or different and each is a residue of formula II ##STR9## in which Y is H, CO 2 H, SO 3 H, Cl, Br, NO 2 , NH 2 , alkyl, aryl, alkoxy or aryloxy and n is 1, 2, 3, 4 or 5 or formula V: ##STR10## in which P and Q are the same or different and each is H, CO 2 H, SO 3 H, Cl, Br, NO 2 , NH 2 , alkyl, aryl, alkoxy or aryloxy; and l is 1, 2, 3 4 or 5 and, when l is 2, 3, 4 or 4 then individual substituents Q may be the same or different; and either both R 1 are H and both R 2 are SO 3 H, or both R 1 are Cl, CH 3 O or C 1 -C 4 alkyl and both R 2 are H; provided that the compound of formula IV contains at least one SO 3 H or CO 2 H substituent; or R 1 and R 2 are the same and each is SO 3 H or CO 2 H.
Claim 18
Dependent Claim
80 words
A process according to claim 12 wherein the biazo dyestuff has the formula VI: ##STR11## wherein B and B 1 are the same or different and each is a residue of the formula II or V and R 3 and R 4 , independently, are Cl, CH 3 O, C 1 -C 4 alkyl, SO 3 H or CO 2 H, provided that the compound of formula VI contains at least one SO 3 H or CO 2 H group.
Claim 19
Dependent Claim
39 words
A process according to claim 12 wherein the bisazo dyestuff is one obtained by coupling acetoacetanilide, acetoacet-m-xylidide, acetoacet-o-toluidide, acetoacet-p-toluidide, acetoacet-o-anisidide, acetoacet-o-chloroanilide, 3-methyl-1-phenyl-5-pyrazolone or 3-methyl-1-p-tolyl-5-pyrazolone, onto 4,4'-diamino-2,2'-biphenyl disulphonic acid; or one obtained by coupling acetoacet-p-sulphonilide onto 3,3'-dichlorobenzidine or onto 3,3'-dimethoxybenzidine.
Claim 20
Dependent Claim
33 words
A process according to claim 1 wherein the amount of azo dyestuff used ranges from 0.1 to 25% by weight, based on the weight of the total pigment composition produced in the process.
Claim 21
Dependent Claim
33 words
A process according to claim 19 wherein the amount of azo dyestuff used ranged from 0.5 to 10% by weight, based on the weight of the total pigment composition produced in the process.
Claim 22
Dependent Claim
25 words
A process according to claim 1 wherein the azo dyestuff and the azo pigment are of the same chemical type and of the same shade.
Claim 23
Dependent Claim
15 words
A paint or plastic containing a pigment prepared by the process according to claim 1.
Claim 24
Dependent Claim
14 words
A printing ink containing a pigment prepared by the process according to claim 1.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |