Use of polyelectrolyte complexes for producing polymer foils with oxygen-barrier properties

US8980437B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Carmen-Elena Cimpeanu · Ludwigshafen, DE
• Thomas Breiner · Hemsbach, DE
• Dieter Urban · Speyer, DE
• Karl-Heinz Schumacher · Ludwigshafen, DE
• Volker Schaedler · Maikammer, DE
• Heiko Diehl · Mannheim, DE
• Hermann Seyffer · Heidelberg, DE

Key dates

• Filing date: Aug 17, 2010
• Grant date: Mar 17, 2015
• Expiry date: Mar 9, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31928
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The use of polyelectrolyte complexes is described, for providing an oxygen barrier to packaging materials made of polymer foils. Polymeric components of the polyelectrolyte complex are applied in polymerized form to the polymer foil. The polymer foil is either coated with an aqueous dispersion comprising a dispersed polyelectrolyte complex previously produced by water-in-water emulsion polymerization, or is coated with a composition comprising a polyelectrolyte complex produced from anionic polymer and from cationic surfactant, or the polymer foil is coated with at least three alternating layers, where respectively one of two adjacent layers comprises an anionic polyelectrolyte component and the other of two adjacent layers comprises a cationic polyelectrolyte component, and polyelectrolyte complexes form at the opposite, adjacent interfaces of the alternating layers.