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US4655845A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for preparing organic pigments having excellent application properties

Assignee: Hoechst AG
•
Filing: 1985-08-29
•
Granted: 1987-04-07
•
Expires: 2005-08-29
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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 04:23
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)

GB997476A Cited
US3265699A Cited
US4057436A Cited
GB1463141A Cited
US4153602A Cited
US4432796A Cited
US4522654A Cited

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

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