Polymer particles containing dye

US6844377B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Helmut Auweter · Schifferstadt, DE
• Heribert Bohn · Wattenheim, DE
• Robert Heger · Heidelberg, DE
• Ulrike Schlosser · Ludwigshafen, DE
• Karl Siemensmeyer · Bischofswerda, DE

Key dates

• Filing date: Sep 29, 1999
• Grant date: Jan 18, 2005
• Expiry date: Sep 29, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D11/328
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Dye-containing polymer particles of at least one dye in a matrix of an essentially water-insoluble polymer and having an average particle size within the range from 5 nm to 5 μm are prepared by a process which comprises precipitating the dye-containing polymer particles from a solution of the polymer and of the dye in a water-miscible organic solvent by addition of an aqueous phase thereto.