Patent US3874891A successfully refreshed from Google Patents.
US3874891A
Expired / Lapsed
US
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Dispersing agents for the fine distribution and stabilisation of dyes
Assignee: Hoechst AG
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Filing: 1973-02-22
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Granted: 1975-04-01
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Expires: 1993-02-22
Abstract
Abstract A dye and pigment dispersion containing a sulfuric acid semiester of the formula IN WHICH X is ethylene or propylene, R1 alkyl of 4 to 14 carbon atoms, R2 hydrogen or alkyl of 4 to 14 carbon atoms, n an integer of 2 to 25, z zero or an integer of 1 to 8 and Me hydrogen, alkali, alkaline earth metal, an ammonium ion or a radical of an organic base, and a process for preparing it by grinding the dye or pigment in the presence of an aqueous solution of said sulfuric acid semi-ester. The dispersing agents obtained have a good dispersing effect and tinctorial strength and give a neutral reaction in contrast to most of the known anionic dispersing agents.
Inventors
- 👤 Max Grobmann
- 👤 Karl-Hermann List
- 👤 Heinz Uhrig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:11
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09K; C09K23/00; C09K23/12; Y; Y10; Y10S; Y10S8/00; Y10S8/908
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
A DYESTUFF AND PIGMENT DISPERSION CONTAINING, AS THE DISPERSING AGENT, A SULFURIC ACID SEMI-ESTER OF THE GENERAL FORMULA
Claim 2
Dependent Claim
18 words
A DYESTUFF AND PIGMENT DISPERSION CONTAINING, AS THE DISPERSING AGENT, A SULFURIC ACID SEMI-ESTER OF THE GENERAL FORMULA
Claim 3
Dependent Claim
42 words
A process for the preparation of a dyestuff and pigment dispersion as claimed in claim 1, wherein the dyestuff or pigment is ground in the presence of an aqueous solution of a sulfuric acid semi-ester of the formula specified 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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |