US4186028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pigment suspensions with phosphonocarboxylic acids
Assignee: Bayer AG
•
Filing: 1978-05-30
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Granted: 1980-01-29
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Expires: 1998-05-30
Abstract
Abstract In an aqueous fluid dispersible filler or pigment suspension containing a dispersion aid, the improvement which comprises employing as the dispersion aid about 0.01 to 1% by weight, based on solids, of a phosphonocarboxylic acid or a salt thereof. The pigment may be TiO2 and be present in from 30 to 80% concentration. The dispersion aid may be phosphonobutane-1, 2,4-tricarboxylic acid or a salt, and an amine or alkanolamine may also be present.
Inventors
- 👤 Peter Woditsch
- 👤 Gunther Teichmann
- 👤 Gunter Linde
- 👤 Gunter Lailach
- 👤 Fritz Rodi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C09K; C09K23/00; C09K23/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
38 words
In an aqueous fluid dispersible pigment suspension containing a dispersion aid, the improvement which comprises employing as the dispersion aid about 0.01 to 1% by weight, based on pigment solids, of a phosphonocarboxylic acid or a salt thereof.
Claim 2
Dependent Claim
38 words
In an aqueous fluid dispersible pigment suspension containing a dispersion aid, the improvement which comprises employing as the dispersion aid about 0.01 to 1% by weight, based on pigment solids, of a phosphonocarboxylic acid or a salt thereof.
Claim 3
Dependent Claim
41 words
A suspension as claimed in claim 1, wherein the phosphonocarboxylic acid is of the formula ##STR4## in which R 1 is hydrogen, or C 1-4 -alkyl radical, and R 2 and R 3 each independently is hydrogen or C 1-3 -alkyl.
Claim 4
Dependent Claim
14 words
A suspension as claimed in claim 1, wherein the phosphonocarboxylic acid is phosphonobutane-1,2,4-tricarboxylic acid.
Claim 5
Dependent Claim
15 words
A suspension as claimed in claim 1, wherein the material suspended comprises TiO 2 .
Claim 6
Dependent Claim
23 words
A suspension as claimed in claim 1, wherein the material suspended is present in a concentration of about 30 to 80% by weight.
Claim 7
Dependent Claim
54 words
A suspension as claimed in claim 5, wherein the material suspended comprises TiO 2 , the dispersion aid comprises phosphonobutane-1,2,4-tricarboxylic acid or a salt thereof in about 0.05 to 0.5% by weight based on solids, and the suspension further contains an amine or alkanolamine in about 0.05 to 1% by weight based on solids.
Claim 8
Dependent Claim
58 words
A process for the production of a fluid aqueous suspension of a pigment from a filter cake thereof, comprising mixing said filter cake with about 0.01 to 1% by weight of a phosphonocarboxylic acid or salt thereof, and adjusting the water content of the mixture to from about 30 to 80% by weight to produce a fluid suspension.
Claim 9
Dependent Claim
58 words
A process for the production of a fluid aqueous suspension of a pigment from a filter cake thereof, comprising mixing said filter cake with about 0.01 to 1% by weight of a phosphonocarboxylic acid or salt thereof, and adjusting the water content of the mixture to from about 30 to 80% by weight to produce a fluid suspension.
Claim 10
Dependent Claim
66 words
In the processing and transport of an aqueous suspension of a filler or pigment containing an amine or alkanolamine as a dispersion aid, the improvement which comprises additionally including in the suspension about 0.01 to 1% by weight, based on filler or pigment solids, of a phosphonocarboxylic acid or a salt thereof, whereby settling of the solids in the suspension is reduced along with the viscosity.
Claim 11
Dependent Claim
66 words
In the processing and transport of an aqueous suspension of a filler or pigment containing an amine or alkanolamine as a dispersion aid, the improvement which comprises additionally including in the suspension about 0.01 to 1% by weight, based on filler or pigment solids, of a phosphonocarboxylic acid or a salt thereof, whereby settling of the solids in the suspension is reduced along with the viscosity.
Claim 12
Dependent Claim
41 words
A suspension as claimed in claim 8, wherein the phosphonocarboxylic acid is of the formula ##STR5## in which R 1 is hydrogen, or C 1-4 -alkyl radical, and R 2 and R 3 each independently is hydrogen or C 1-3 -alkyl.
Claim 13
Dependent Claim
14 words
A suspension as claimed in claim 8, wherein the phosphonocarboxylic acid is phosphonobutane-1,2,4-tricarboxylic acid.
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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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |