Smear resistant inkjet inks

US9090734B2 · kind B2 · utility

Assignee

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

Inventors

• Daniel C. Kraiter · Wilmington, US
• Jose Esteban Valentini · West Chester, US
• Xiaoqing Li · Newark, US

Key dates

• Filing date: Nov 10, 2010
• Grant date: Jul 28, 2015
• Expiry date: Sep 23, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D11/326
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Inkjet inks are provided, relating in particular to smear resistant inkjet inks, and even more particularly to smear resistant pigmented aqueous inkjet inks comprising polyurethane dispersions and self-dispersing pigments. The polyurethane dispersions have a glass transition temperature Tg greater than −30 ° C. to less than about 35 ° C. and have at least one of the following thermal properties: loss modulus E″ of 1.7 to 5×108 pascals, and/or a peak tan delta is 0.23 to 0.65, where the glass transition temperature, peak tan delta and the loss modulus are measured by dynamic mechanical analysis on a film prepared from the polyurethane dispersion.