| 摘要 |
<p>A description is given of paper or cardboard packaging comprising recycled paper which has been exposed to mineral oil, said packaging having a barrier layer which can be produced by application of an aqueous polymer dispersion comprising a mixture of at least two polymers A and B. Polymer A is preparable by emulsion polymerization of C1 to C4 alkyl (meth)acrylates, acid monomers, for example acrylic acid or methacrylic acid, 0-20% by weight of acrylonitrile and 0% to 10% by weight of further monomers, the glass transition temperature of the copolymer A being greater than +45°C and the glass transition temperature of polymer B being less than +10°C. The average value calculated from the glass transition temperatures of the individual polymers is situated in the range from +10°C to +45°C. The barrier layer may be located on one of the packaging surfaces, or may form one of a plurality of layers of a multi-layer packaging coating, or may be located as a coating on one side of an inner pouch located in the packaging.</p> |
