UV blocking film and composition comprising microfibrillated cellulose, a method for producing said film and use of the composition
AssigneeStora Enso OYJ
InventorsIsto Heiskanen, Katja Lyytikäinen, Esa Saukkonen, Kaj Backfolk
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Abstract
The present invention relates to an UV blocking film comprising microfibrillated cellulose wherein at least part of the microfibrillated cellulose is microfibrillated cellulose produced from non-chemical modified lignocellulosic material. The invention also relates to a method for producing the film, use of said film as well as a composition having UV blocking properties.
Claims22
An UV blocking film comprising microfibrillated cellulose wherein at least part of the microfibrillated cellulose is microfibrillated cellulose produced from non-chemical modified lignocellulosic material wherein the film comprises 2.5-50% by weight of fiber based material of microfibrillated cellulose produced from non-chemical modified lignocellulosic material;
- and wherein at least part of the microfibrillated cellulose is microfibrillated cellulose produced from chemical modified lignocellulosic material wherein the film comprises 50-97.5% by weight of fiber based material of microfibrillated cellulose produced from chemical modified lignocellulosic material.
A method for manufacturing a film having UV blocking properties wherein the method comprises the steps of:
- providing a first suspension comprising microfibrillated cellulose produced from non-chemical modified lignocellulosic material,
- providing a second suspension comprising microfibrillated cellulose produced from chemical modified lignocellulosic material,
- mixing the first and second suspension whereby a mixture is obtained,
- wherein the mixture comprises the first suspension in an amount of 2.5-50% by weight of the fiber based material and the second suspension in an amount of 50-97.5% by weight of the fiber based material,
- conducting the mixture to a wire and thereafter,
- dewatering the mixture to form the film.
A composition having UV blocking properties wherein said composition comprises microfibrillated cellulose produced from non-chemical modified lignocellulosic material wherein the composition comprises 2.5-50% by weight of fiber based material of microfibrillated cellulose produced from non-chemical modified lignocellulosic material, and wherein said composition comprises microfibrillated cellulose produced from chemical modified lignocellulosic material wherein the film comprises 50-97.5% by weight of fiber based material of microfibrillated cellulose produced from chemical modified lignocellulosic material.
Dependencies are inferred from the claim text.