Method for conditioning organic pigments

US6410619B2 · kind B2 · utility

Assignees

• BAYER HEALTHCARE LLC · DE
• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Michael J. Greene · Lompoc, US
• Patrick F. McIntyre · West Chester, US
• James G. King · Kingwood, US
• Gregory R. Schulz · Fairfax, US
• Karyn B. Visscher · Voorhees, US

Key dates

• Filing date: Nov 22, 1999
• Grant date: Jun 25, 2002
• Expiry date: Nov 22, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0022
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

This invention relates to a process for preparing conditioned organic pigments by(a) milling a mixture comprising:(1) one or more crude organic pigments;(2) at least about 0.1% by weight, relative to the organic pigment, of one or more acrylic copolymer dispersants; and(3) 0 to about 100 parts by weight, relative to the organic pigment, of a milling liquid in which the organic pigment is substantially insoluble; and(b) isolating the milled organic pigment.