Patent EP1340473A3 successfully refreshed from Google Patents.
Patent FR2392083A1 successfully refreshed from Google Patents.
← Back to Patent Explorer
FR2392083A1 Expired / Lapsed FR ⏱️ 0.0 years remaining

PROCESS FOR THE PRODUCTION OF DYES OF THE TRIARYLMETHANE CLASS

Assignee: Bayer AG
•
Filing: 1978-05-25
•
Granted: —
•
Expires: 1998-05-25
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Translated from French L'invention a trait à la chimie des colorants. Elle concerne un procédé pour l'obtention de colorants de la classe des triarylméthanes avec un excellent degré de pureté. Les masses réactionnelles fondues chaudes obtenues par des procédés connus sont introduites dans un système de deux phases formé d'eau et d'un solvant organique dont la miscibilité dans l'eau est nulle ou limitée, puis les colorants sont séparés. Les teintes des colorants de la classe des triarylméthanes isolés de cette façon sont plus claires et plus bleues que celles des colorants purifiés par les procédés classiques. The invention relates to the chemistry of dyes. It relates to a process for obtaining dyes of the triarylmethane class with an excellent degree of purity. The hot molten reaction masses obtained by known processes are introduced into a two-phase system formed of water and an organic solvent, the miscibility of which in water is zero or limited, then the dyes are separated. The hues of the dyes of the triarylmethane class isolated in this way are lighter and bluer than those of the dyes purified by conventional methods.

Inventors

No inventors recorded.

Bibliographic Details

Application Number —
Jurisdiction FR
Data Source google_patents
Last Synchronized 2026-10-23 13:49
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10

Claims Analysis

Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.

References Cited (Backward Citations)

US2181369A Cited
US2422445A Cited
FR2075731A5 Cited
FR2334720A1 Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag