Patent · US Active

Method for the production of pure C.I. pigment orange 74

US8329369B2 · kind B2 · utility

0Cited by

5References

14Claims

0Family size

Assignee

Clariant Finance (BVI) Limited · VG

Inventors

Thomas Hundsdorf · Weiterstadt, DE
Willi Rauschmann · Frankfurt am Main, DE

Key dates

Filing date	May 21, 2008
Grant date	Dec 11, 2012
Priority date	—
Expiry date	Oct 23, 2029

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09D11/322
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method for conditioning and purifying pigment orange 74. The method is characterized in that the aqueous suspension of the raw pigment, optionally after adding an organic solvent from the group comprising isobutanol, chlorobenzene and o-dichlorobenzene, is subjected to a finishing treatment, the organic solvent is optionally removed using a distillation process, the remaining aqueous pigment suspension is mixed with a non-ionic surfactant and is heated to a temperature ranging from 30 to 100° C. and the pigment is then filtered off.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.