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Patent US9950502
Issued 2018-04-24
Paper And Cardboard Packaging With Barrier Coating
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.
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- 1. A paper or a cardboard packaging produced at least partly from mineral oil contaminated paper, wherein the packaging includes at least one barrier layer obtained by applying an aqueous polymer dispersion comprising at least one copolymer obtained by emulsion polymerization of
(a) one or more principal monomers that are C1-C4 alkyl (meth)acrylates, (b) 0.1 to 5 wt % of one or more acid monomers, (c) 0-20 wt % of acrylonitrile and (d) 0 to 10 wt % of a further monomer other than the monomers (a) to (c), wherein a glass transition temperature of the copolymer is in the range from +10 to +45° C., wherein the emulsion polymerization is carried out in an aqueous medium comprising a carbohydrate compound, wherein the barrier layer comprises the carbohydrate compound, and wherein the barrier layer may be situated on one or more of the surfaces of the packaging; or the barrier layer may form at least one of multiple layers of a multilayered packaging coating.
