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US 11,623,973 B2Granted
Mineral oil barrier
AssigneeOmya International AG
InventorRamon Rohé
Life of this patent
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Abstract
The present invention relates to packaging material comprising a plastic substrate comprising at least one surface, and a barrier layer for hydrophobic substances, wherein the barrier layer is in contact with the at least one surface of the plastic substrate, wherein the barrier layer comprises a copolymer, a surface-reacted calcium carbonate, and a mineral material selected from natural ground calcium carbonate and/or precipitated calcium carbonate, as well as a method for producing the same and its use.
Claims22
A packaging material comprising
- a plastic substrate comprising at least one surface, and
- a barrier layer for hydrophobic substances, wherein the barrier layer is in contact with the at least one surface of the plastic substrate, and
- wherein the barrier layer comprises
- (I) a copolymer obtained by emulsion polymerization of
- (i) one or more principal monomers selected from the group consisting of C1-C4 alkyl (meth)acrylates, and
- (ii) 0.1 to 5 wt.-% of one or more acid monomers,
- wherein the glass transition temperature Tg of the copolymer is from −10 to 70° C., and the emulsion polymerization is carried out in an aqueous medium in the presence of at least one carbohydrate compound,
- (II) a surface-reacted calcium carbonate, wherein the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O+ ion donors, wherein the carbon dioxide is formed in situ by the H3O+ ion donors treatment and/or is supplied from an external source, and
- (III) a mineral material selected from natural ground calcium carbonate and/or precipitated calcium carbonate,
- wherein the weight ratio of the surface-reacted calcium carbonate to the mineral material is from 1:8 to 1:2,
- wherein the barrier layer has a Heptane Vapour Transmission Rate (HpVTR) of no more than 10.3 g/m2/d,
- wherein the barrier layer has a layer weight of at least 2 g/m2.
9 more elements
A method for producing a packaging material, comprising the steps of:
- A) providing a plastic substrate comprising at least one surface,
- B) providing a liquid barrier layer composition,
- C) applying the liquid barrier layer composition onto the at least one surface of the plastic substrate to form a barrier layer for hydrophobic substances, and
- D) drying the barrier layer,
- wherein the liquid barrier layer composition comprises
- (I) a copolymer obtained by emulsion polymerization of
- (i) one or more principal monomers selected from the group consisting of C1-C4 alkyl (meth)acrylates, and
- (ii) 0.1 to 5 wt.-% of one or more acid monomers,
- wherein the glass transition temperature Tg of the copolymer is from −10 to 70° C., and the emulsion polymerization is carried out in an aqueous medium in the presence of at least one carbohydrate compound,
- (II) a surface-reacted calcium carbonate, wherein the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O+ ion donors, wherein the carbon dioxide is formed in situ by the H3O+ ion donors treatment and/or is supplied from an external source, and
- (III) a mineral material selected from natural ground calcium carbonate and/or precipitated calcium carbonate,
- wherein the weight ratio of the surface-reacted calcium carbonate to the mineral material is from 1:8 to 1:2, wherein the barrier layer has a Heptane Vapour Transmission Rate (HpVTR) of no more than 10.3 g/m2/d, wherein the barrier layer has a layer weight of at least 2 g/m2.
9 more elements
A barrier layer, wherein the barrier layer is suitable for use in a plastic substrate, wherein the barrier layer prevents migration of hydrophobic substances, and wherein the barrier layer comprises
- (I) a copolymer obtained by emulsion polymerization of
- (i) one or more principal monomers selected from the group consisting of C1-C4 alkyl (meth)acrylates, and
- (ii) 0.1 to 5 wt.-% of one or more acid monomers,
- wherein the glass transition temperature Tg of the copolymer is from −10 to 70° C., and the emulsion polymerization is carried out in an aqueous medium in the presence of at least one carbohydrate compound,
- (II) a surface-reacted calcium carbonate, wherein the surface-reacted calcium carbonate is a reaction product of natural ground calcium carbonate or precipitated calcium carbonate with carbon dioxide and one or more H3O+ ion donors, wherein the carbon dioxide is formed in situ by the H3O+ ion donors treatment and/or is supplied from an external source, and
- (III) a mineral material selected from natural ground calcium carbonate and/or precipitated calcium carbonate,
- wherein the weight ratio of the surface-reacted calcium carbonate to the mineral material is from 1:8 to 1:2, wherein the barrier layer has a Heptane Vapour Transmission Rate (HpVTR) of no more than 10.3 g/m2/d, wherein the barrier layer has a layer weight of at least 2 g/m2.
4 more elements
Dependencies are inferred from the claim text.