US4227936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of readily dispersible pigment preparations
Assignee: Evonik Operations GmbH
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Filing: 1979-02-23
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Granted: 1980-10-14
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Expires: 1999-02-23
Abstract
Abstract A process for the production of readily dispersible pigment preparations with a pigment content of more than 65% is disclosed. An aqueous suspension containing 25% to 50% by weight of a pigment is made and kneaded with heating to 60°-70° C. Following addition of a cation-active substance and an oleate, a binder dissolved in an organic solvent is added and a phase inversion takes place whereby water is separated out. After decantation, the organic mass of pigment is kneaded and dried.
Inventors
- 👤 Gunter Osswald
- 👤 Willy Gouders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:31
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0021; C09C; C09C3/00; C09C3/003; C09D; C09D17/00; C01; C01P; C01P2004/00; C01P2004/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
A process for the production of readily dispersible pigment preparations with a pigment content of more than 65% by weight, comprising suspending the pigment in water, to form a suspension having a solids content of 25 to 50% by weight, kneading the suspension, heating the pigment suspension while kneading to a temperature of 60° to 70° C., adding to the suspension a cationactive substance and an oleate, adding a binder dissolved in an organic solvent to the suspension while kneading, the water which is expressed from the kneaded suspension and the organic mass obtained thereby is continued to be kneaded and subsequently dried.
Claim 2
Dependent Claim
103 words
A process for the production of readily dispersible pigment preparations with a pigment content of more than 65% by weight, comprising suspending the pigment in water, to form a suspension having a solids content of 25 to 50% by weight, kneading the suspension, heating the pigment suspension while kneading to a temperature of 60° to 70° C., adding to the suspension a cationactive substance and an oleate, adding a binder dissolved in an organic solvent to the suspension while kneading, the water which is expressed from the kneaded suspension and the organic mass obtained thereby is continued to be kneaded and subsequently dried.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the suspension initially formed has a solids content of 30 to 45% be weight.
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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |