Process for the preparation of powder coating compositions

US6828363B2 · kind B2 · utility

Assignee

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

Inventors

• Sabine H. G. Beuermann · Clausthal-Zellerfeld, DE
• Michael Buback · Bovenden, DE
• Michael Juergens · Rheydt, DE
• Eckhard Weidner · Erlangen, DE
• Marcus Petermann · Bochum, DE
• Christian Schwede · Weinheim, DE
• Peter Klostermann · Sprockhövel, DE

Key dates

• Filing date: Aug 23, 2001
• Grant date: Dec 7, 2004
• Expiry date: May 18, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/54
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method of preparation for polymers, particularly binders for powder coatings and powder coatings which are prepared as a solution in a supercritical fluid phase. Binders for powder coatings are prepared from at least two ethylenically unsaturated monomers capable of free-radical or ionic copolymerization, and conventional initiators and regulators in supercritical fluids, whereby polymerization is carried out in the homogeneous phase, and, after the reaction has ended, either the composition or the phase parameters of the mixture are altered so that at least two phases with supercritical fluid are obtained, and the phase containing predominantly polymer is separated and the polymer is separated as a powder from the sc fluid by depressurization or the polymer phase is further processed under supercritical phase conditions to the powder coating.