Paper and cardboard packaging with barrier coating

US9950502B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Hermann Seyffer · Heidelberg, DE
• Carmen-Elena Cimpeanu · Ludwigshafen, DE
• Heiko Diehl · Mannheim, DE
• Darijo Mijolovic · Mannheim, DE
• Andre van Meer · Noordwolde, NL
• Jan Van Delft · Wolvega, NL
• Christof Van Sluijs · Leeuwarden, NL

Key dates

• Filing date: Dec 3, 2012
• Grant date: Apr 24, 2018
• Expiry date: Mar 31, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31906
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

Described is paper or cardboard packaging produced from mineral oil contaminated, (e.g., recycled) paper, wherein the packaging includes a barrier layer obtainable by applying an aqueous polymer dispersion comprising a copolymer obtainable 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 to 10 wt % of further monomers in an aqueous medium in the presence of a carbohydrate compound, preferably in the form of a degraded starch, wherein the glass transition temperature of the copolymer is in the range from +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.