Patent ID: 9034444
Filing Date: 2015-05-19
Classification: B32B,D21H,Y10T

Abstract:
1. Paper or cardboard packaging produced at least partly from recycled paper contaminated with mineral oil, wherein the packaging comprises at least one barrier layer obtained by applying an aqueous polymeric dispersion comprising a mixture of at least two polymers A and B, wherein polymer A is a copolymer obtained by emulsion polymerization of: (a) one or more principal monomers that are C (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), polymer B is a copolymer obtained by emulsion polymerization of one or more principal monomers selected from C wherein a glass transition temperature of polymer A is greater than +45° C., a glass transition temperature of polymer B is less than +10° C., and a mean value calculated from the glass transition temperatures of the individual polymers is in a range from +10 to +45° C., wherein the mineral oil contamination comprises a printing ink comprising at least one selected from the group consisting of a volatile paraffin, a volatile naphthene and a volatile aromatic hydrocarbon, wherein the barrier layer is situated on one or more surfaces of the packaging, the barrier layer is at least one layer of multiple layers of a multilayered packaging coating, or the barrier layer is situated as a coating on at least one side of an inner bag situated within the packaging, and wherein the coating has a permeability to gaseous n-hexane of less than 50 g/m