Barrier layer for a packaging laminate and packaging laminate comprising such barrier layer
AssigneeTetra Laval Holdings & Finance S.A.
InventorsAnn-Christine Albertsson, Ulrica Edlund
Life of this patent
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Abstract
The present invention relates to a barrier layer and a packaging laminate comprising a barrier layer and a method to produce a barrier layer. The barrier layer is manufactured of a cellulose-based hydrolysate. The barrier layer comprises lignin and oligo- or poly-saccharides, where the lignin and oligo- or polysaccharides are at least partly covalently bonded to each other in a matrix, and at least one co-component. The co-component is bonded to the lignin and oligo- or polysaccharides by means of primary and/or secondary bonds. In addition, the invention relates to a package made of the packaging laminate.
Claims14
A barrier layer for a packaging laminate, which barrier layer is made of a cellulose-based hydrolysate
- wherein
- said barrier layer comprises
- ignin and oligo- or polysaccharides, said lignin and oligo- or polysaccharides being at least partly covalently bonded to each other in a matrix;
- and
- at least one co-component;
- wherein said at least one co-component is bonded to said lignin and oligo- or polysaccharides by primary and/or secondary bonds;
- wherein said barrier layer has an oxygen permeability of less than 50 cm3/m2/24 h measured according to ASTM D3985-95 at an air humidity of 80% RH, 1 atm and a thickness less than 50 μm for said barrier layer.
A packaging laminate for a packaging container for products being sensitive to oxygen, which packaging laminate comprises a base layer, a first outer layer on one side of the base layer and a second outer layer on the other side of the base layer, and a barrier layer adapted to serve as a gas barrier between the base layer and said first outer layer, wherein
- said barrier layer comprises
- lignin and oligo- or polysaccharides, said lignin and oligo- or polysaccharides being at least partly covalently bonded to each other in a matrix;
- and
- at least one co-component;
- wherein said at least one co-component is bonded to said lignin and oligo- or polysaccharides by primary and/or secondary bonds;
- wherein said barrier layer has an oxygen permeability of less than 50 cm3/m2/24 h measured according to ASTM D3985-95 at an air humidity of 80% RH, 1 atm and a thickness less than 50 μm for said barrier layer.
Dependencies are inferred from the claim text.