# US 8,771,812 B2 · Paper and cardboard packaging with barrier coating

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- Number: US 8,771,812 B2
- Document ID: US8771812B2
- Status: Granted
- Kind: B2
- Application number: 13/482,526
- Filed: 2012-05-29
- Published: 2012-12-06
- Granted: 2014-07-08
- Earliest claimed: 2011-05-30
- Assignees: BASF SE
- Applicants: Hermann Seyffer; Carmen-Elena Cimpeanu; Ines Pietsch; Axel Weiss; Peter Preishuber-Pfluegl; Heiko Diehl; Marc Bothe; Florian Buesch
- Inventors: Hermann Seyffer; Carmen-Elena Cimpeanu; Ines Pietsch; Axel Weiss; Peter Preishuber-Pfluegl; Heiko Diehl; Marc Bothe; Florian Buesch
- Web page: https://patentgrep.com/patent/US8771812B2

## CPC

- D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38)
- D21H 11/14: Secondary fibres (working-up waste paper D21C5/02)
- D21H 19/58: Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
- D21H 19/82: superposed {(D21H19/84 takes precedence)}
- D21H 21/16: Sizing or water-repelling agents
- B65B 25/001: {of foodstuffs, combined with their conservation (B65B25/041, B65B25/062, B65B25/067 take precedence)}
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1303: Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
- Y10T 428/1314: Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1359: Three or more layers [continuous layer]
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- B65B: MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING (bundling and pressing devices for cigars A24C1/44; devices for tensioning and securing binders adapted to be supported by the article or articles to be bound B25B25/00; applying closure members to bottles, jars or similar containers B67B1/00-B67B6/00; concurrent cleaning, filling and closing of bottles B67C7/00; emptying bottles, jars, cans, casks, barrels or similar containers B67C9/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Described is paper or cardboard packaging produced from mineral oil contaminated, recycled paper, wherein the packaging includes a barrier layer obtainable by applying an aqueous polymeric 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, 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.

## Claims

### Claim 1

Paper or cardboard packaging produced at least partly from mineral oil contaminated, recycled paper, wherein the packaging includes at least one barrier layer obtained by applying an aqueous polymeric 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 one or more further monomers other than the monomers (a) to (c),
wherein a glass transition temperature of the copolymer is in a range from +10 to +45° C.,
wherein the copolymer does not contain any crosslinker, and
wherein the barrier layer may be situated on one or more surfaces of the packaging, or the barrier layer may form at least one of multiple layers of a multilayered packaging coating or the barrier layer may be situated as a coating on at least one side of an inner bag situated within the packaging.

### Claim 2 (depends on 1)

The packaging of claim 1, wherein the copolymer comprises the principal monomers (a) to an extent of at least 70 wt %.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

The packaging of claim 1, wherein the copolymer is obtained from
(a) 79.5 to 99.5 wt % of one or more principal monomers that are C1-C4 alkyl(meth)acrylates,
(b) 0.5 to 5 wt % of one or more acid monomers selected from the group consisting of acrylic acid and methacrylic acid,
(c) 0-20 wt % of acrylonitrile, and
no further monomers other than the monomers (a) to (c).

### Claim 5 (depends on 1)

The packaging of claim 1, wherein the glass transition temperature of the copolymer is in a range from +15 to +40° C.

### Claim 6 (depends on 1)

The packaging of claim 1, wherein the copolymer is 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) 1-20 wt % of acrylonitrile and
(d) 0 to 10 wt % of one or more further monomers other than the monomers (a) to (c).

### Claim 7 (depends on 1)

The packaging of claim 1, wherein the further monomers (d) are selected from the group consisting of a C5-C20 alkyl(meth)acrylate, a vinyl ester of a 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 ether of an alcohol comprising 1 to 10 carbon atoms, and an aliphatic hydrocarbon having 2 to 8 carbon atoms and one or two double bonds.

### Claim 8 (depends on 1)

The packaging of claim 1, further comprising up to 1 part by weight of a platelet-shaped pigment per 1 part by weight of the copolymer.

### Claim 9 (depends on 1)

The packaging of claim 1, wherein the coating with the copolymer has a permeability to gaseous n-hexane of less than 50 g/m2 d at 23° C. and a coat weight of 20 to 25 g/m2 on paper.

### Claim 10 (depends on 1)

The packaging of claim 1, wherein the aqueous polymer dispersion comprises 15 to 75 wt % of the copolymer.

### Claim 11 (depends on 1)

The packaging of claim 1, wherein the mineral oil contamination comes from printing inks and comprises at least one substance selected from the group consisting of a volatile paraffin, a volatile naphthene, and a volatile aromatic hydrocarbon.

### Claim 12 (depends on 1)

The packaging of claim 1, wherein the barrier layer is situated as a coating on at least one side of an inner bag situated in the packaging and the material of the inner bag comprises a polyolefin.

### Claim 13 (depends on 1)

The packaging of claim 1, wherein the barrier layer is from 2 to 30 μm in thickness.

### Claim 14 (depends on 1)

The packaging of claim 1, wherein the barrier layer consists of one or more polymer layers.

### Claim 15 (depends on 1)

The packaging of claim 1, which comprises at least one selected from the group consisting of a paraffinic hydrocarbon and a naphthenic hydrocarbon.

### Claim 16 (depends on 15)

The packaging of claim 15, comprising at least one of a paraffinic hydrocarbon and a naphthenic hydrocarbon having 15-25 carbon atoms.

### Claim 17 (depends on 1)

The packaging according to claim 1, wherein the copolymer comprises from 79.5 to 99.5 wt % of the principal monomers.

### Claim 18 (depends on 17)

The packaging of claim 17, wherein the principal monomer is at least one selected from the group consisting of ethyl acrylate, methyl acrylate and methyl methacrylate, and the acid monomer comprises acrylic acid.

### Claim 19 (depends on 17)

The packaging according to claim 17, further comprising 1-20% of acrylonitrile.

### Claim 20 (depends on 17)

The packaging according to claim 17, having a hexane permeation of less than 2 g/m2 d.