Patent US9950502

Paper and cardboard packaging with barrier coating
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US9950502

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 (14) (8)

(a) one or more principal monomers that are C₁-C₄alkyl (meth)acrylates,

(b) 0.1 to 5 wt % of one or more acid monomers,

(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.

2. The packaging of claim 1 wherein the copolymer comprises, in reacted form, at least 70 wt % of the one or more principal monomers (a). (0)

3. The packaging of claim 1 wherein the carbohydrate compound is a degraded polysaccharide. (0)

4. The packaging of claim 1 wherein the carbohydrate compound comprises degraded polysaccharides having an intrinsic viscosity η_iof less than 0.07 dl/g. (0)

5. The packaging of claim 1 wherein the emulsion polymerization is carried out in an aqueous medium comprising 10 to 200 parts by weight of the carbohydrate compound per 100 parts by weight of monomer. (0)

6. The packaging of claim 1 wherein the one or more principal monomers (a) are selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate and n-butyl acrylate. (0)

7. The packaging of claim 1 wherein the copolymer is obtained by emulsion polymerization of (0) (4)

(a) 79.5 to 99.5 wt % of one or more principal monomers that are C₁-C₄alkyl (meth)acrylates,

(b) 0.5 to 5 wt % of one or more acid monomers selected from acrylic acid and methacrylic acid,

no further monomers other than the monomers (a) to (c).

8. The packaging of claim 1 wherein the glass transition temperature of the copolymer is in the range from +15 to +40° C. (0)

9. The packaging of claim 1 wherein the monomer (d) is at least one selected from the group consisting of a C₅-C₂₀alkyl (meth)acrylate, a vinyl ester of carboxylic acid comprising up to 20 carbon atoms, a vinylaromatic having up to 20 carbon atoms, an ethylenically unsaturated nitrile other than acrylonitrile, a vinyl halide, a vinyl ester of alcohol comprising 1 to 10 carbon atoms, an aliphatic hydrocarbon having 2 to 8 carbon atoms and one double bond and an aliphatic hydrocarbon having 2 to 8 carbon atoms and two double bonds. (0)

10. The packaging of claim 1 wherein the copolymer is present in combination with up to 1 part by weight of a pigment, per 1 part by weight of copolymer. (0)

11. The packaging of claim 1 wherein the copolymer is comprised in the aqueous polymeric dispersion in an amount of 15 to 75 wt %. (0)

12. The packaging of claim 1 wherein the coating with the copolymer has a permeability to gaseous n-hexane of less than 50 g/m²d at 23° C. and a coat weight of 5 to 30 g/m²on paper. (0)

13. The packaging of claim 1 wherein the mineral oil contamination comprises a volatile paraffin, a volatile naphthene and/or a volatile aromatic hydrocarbon. (0)

14. The packaging of claim 1 wherein the barrier layer is from 2 to 30 μm in thickness. (0)

15. A process for producing the packaging of claim 1, the process comprising: (2) (2)

applying the aqueous polymeric dispersion to a packaging substrate or to a surface of an inner bag; and

drying the aqueous polymeric dispersion.

16. The process of claim 15 wherein the aqueous polymeric dispersion is applied to the packaging substrate by a printing process. (0)

17. The process of claim 15 wherein the barrier layer is a barrier against volatile, hydrophobic organic compounds. (2) (0)

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Patent US9950502

Paper and cardboard packaging with barrier coating

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