Patent · US Active

Method of preparing encapsulated pigment dispersions which include polyurethane dispersions

US8912249B2 · kind B2 · utility

1Cited by

18References

22Claims

0Family size

Assignee

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

Inventors

Waifong Liew Anton · Wilmington, US
Hee Hyun Lee · Wilmington, US
Michael Joseph Otley · Hockessin, US
Michael Stephen Wolfe · Wilmington, US

Key dates

Filing date	Dec 15, 2011
Grant date	Dec 16, 2014
Priority date	—
Expiry date	Dec 15, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09D11/40
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A process for encapsulating pigment dispersions is provided where a pigment is dispersed with a polymeric dispersant in an aqueous solvent system. An acrylate monomer and a polyurethane dispersion are added and the resultant mixture is polymerized. Optionally, the acrylate monomer/polyurethane mixture may be emulsified in water with an added surfactant or polymeric dispersant and up to 20% acrylic or other vinyl monomers based on the acrylate may be added to the acrylate monomer/polyurethane mixture before polymerization. Such encapsulated pigment dispersions may be used in inkjet inks and are stable to heat, aging test conditions, and solvent challenges. Prints from these inks have better durability.

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