Patent · US Active

Crystalline modifications of C.I. pigment yellow 181 and associated production method

US7709614B2 · kind B2 · utility

2Cited by

6References

21Claims

0Family size

Assignee

Clariant Produkte (Deutschland) GmbH · DE

Inventors

Martin Schmidt · Frankfurt am Main, DE
Gerald Mehltretter · Schreiber, CA

Key dates

Filing date	Jun 15, 2005
Grant date	May 4, 2010
Priority date	—
Expiry date	May 16, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B67/0029
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Novel crystalline modifications (eta, theta, iota, kappa) of the C.I. Pigment Yellow 181, obtained when one of the known phases or another inventive phase of said pigment is treated with specific solvents. The novel crystalline phases are characterized by yellow shades and excellent coloring properties.

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