Paper and cardboard packaging with barrier coating of a polymer mixture

US9034444B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Hermann Seyffer · Heidelberg, DE
• Carmen-Elena Cimpeanu · Ludwigshafen, DE
• Heiko Diehl · Mannheim, DE

Key dates

• Filing date: May 30, 2012
• Grant date: May 19, 2015
• Expiry date: May 30, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1307
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Paper or cardboard packaging produced from recycled paper contaminated by mineral oil, where the packaging includes a barrier layer obtained by applying an aqueous polymeric dispersion containing a mixture of at least two polymers A and B. Polymer A is obtained by emulsion polymerization of C1-C4 alkyl(meth)acrylates, acid monomers, e.g., acrylic acid or methacrylic acid, 0-20 wt % of acrylonitrile and 0-10 wt % of further monomers, where the glass transition temperature of copolymer A is greater than +45° C. and the glass transition temperature of polymer B is less than +10° C. The mean value calculated from the glass transition temperatures of the individual polymers is +10 to +45° C. The barrier layer may be situated on one of the surfaces of the packaging or form one of multiple layers of a multilayered packaging coating or be situated as a coating on one side of an inner bag situated within the packaging.