Patent US4655845A successfully refreshed from Google Patents.
US4655845A
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Process for preparing organic pigments having excellent application properties
Assignee: Hoechst AG
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Filing: 1985-08-29
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Granted: 1987-04-07
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Expires: 2005-08-29
Abstract
Abstract Process for preparing organic pigments having excellent application properties, which comprises treating finely divided crude pigments of the anthanthrone, pyranthrone, isoviolanthrone, azo, quinacridone, flavanthrone, indanthrone, naphthaldazine, indigo, thioindigo, tetracarboximide, dioxazine, isoindolinone, perylene, anthrapyrimidine, acylanthraquinone, dianthraquinonyl, azoanthraquinone, azomethineanthraquinone and phthalocyanine series at temperatures of 0° C. to 100° C., with acid esters of polyphosphoric acid and a primary, secondary or tertiary alkanol of 1 to 8 carbon atoms, a glycol, glycol ether or phenol, then hydrolyzing the polyphosphate ester used, heating the resultant aqueous mixture to temperatures of 20° C. to 150° C., and isolating the pigment in conventional manner.
Inventors
- 👤 Ernst Spietschka
- 👤 Manfred Urban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:12
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A process for preparing organic pigments having excellent application properties, which comprises treating finely divided crude pigments of the anthanthrone, pyranthrone, isoviolanthrone, azo, quinacridone, flavanthrone, indanthrone, naphthaldazine, indigo, thioindigo, tetracarboximide, dioxazine, isoindolinone, perylene, anthrapyrimidine, acylanthraquinone, dianthraquinonyl, azoanthraquinone, azomethineanthraquinone or phthalocyanine series at temperatures of 0° C. to 100° C., with acid esters of polyphosphoric acid and a primary, secondary or tertiary alkanol of 1 to 8 carbon atoms, a glycol, glycol ether or phenol, then hydrolyzing the polyphosphate ester used, heating the resultant aqueous mixture to tempertures of 20° C. to 150° C., and isolating the pigment in conventional manner.
Claim 2
Dependent Claim
100 words
A process for preparing organic pigments having excellent application properties, which comprises treating finely divided crude pigments of the anthanthrone, pyranthrone, isoviolanthrone, azo, quinacridone, flavanthrone, indanthrone, naphthaldazine, indigo, thioindigo, tetracarboximide, dioxazine, isoindolinone, perylene, anthrapyrimidine, acylanthraquinone, dianthraquinonyl, azoanthraquinone, azomethineanthraquinone or phthalocyanine series at temperatures of 0° C. to 100° C., with acid esters of polyphosphoric acid and a primary, secondary or tertiary alkanol of 1 to 8 carbon atoms, a glycol, glycol ether or phenol, then hydrolyzing the polyphosphate ester used, heating the resultant aqueous mixture to tempertures of 20° C. to 150° C., and isolating the pigment in conventional manner.
Claim 3
Dependent Claim
39 words
The process as claimed in claim 1, wherein the treatment is carried out with an ester of polyphosphoric acid having a P 2 O 5 content of 82-85% by weight and of methanol, n- or i-butanol or ethy glycol.
Claim 4
Dependent Claim
32 words
The process as claimed in claim 1, wherein the treatment is carried out with a polyphosphate ester in which the weight ratio of hydroxyl compound to polyphosphoric acid is 0.5 to 5:1.
Claim 5
Dependent Claim
26 words
The process as claimed in claim 1, wherein the finely divided crude pigment is treated with 2 to 8 times the weight of acid polyphosphate ester.
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) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |