Modified pigments and methods for making and using the same

US8147608B2 · kind B2 · utility

Assignee

• Sensient Colors LLC · US

Inventors

• Puthalath K. Sujeeth · Maryland Heights, US
• Mark Ulrich · Florissant, US
• Gabe Srouji · Pleasant Valley, US
• John P. Kane · Tafton, US
• Daniel A. Ouellette · Saint Peters, US

Key dates

• Filing date: Mar 8, 2011
• Grant date: Apr 3, 2012
• Expiry date: Mar 8, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K9/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method of producing a modified pigment by sulfonating a pigment and subsequently oxidizing the pigment. The modified pigment may have sulfonic acid and carboxyl surface modifying groups attached to the surface of the pigment. Charge balancing counterions such as alkali metals, alkaline earth metals and NR1R2R3H+, where R1, R2 and R3 are independently H or C1-C5 alkyl groups, may be associated with the surface modifying groups. The modified pigment is combined with water to produce a dispersion that can be used in such applications as coatings, paints, papers, adhesives, latexes, toners, textiles, fibers, plastics and inks.