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US 2022/0074140 A1Published application
Method for treating a fibrous material comprising nanocellulose with an organic acid or organic acid salt
AssigneeStora Enso OYJ
InventorsIsto Heiskanen, Katja Lyytikäinen, Otto Nylén, Kaj Backfolk
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Abstract
The present invention relates to a method for preparing a surface-treated fibrous material comprising nanocellulose, in which a fibrous material is surface treated with an organic acid or salt thereof. Fibrous materials as such are also provided. The present technology allows improved Water Vapor Transmission Rates (WVTR) for the fibrous material, while operating on an industrial scale.
Claims22
A method for preparing a surface-treated fibrous material comprising nanocellulose, said method comprising the steps of:
- a. forming a fibrous material from a suspension comprising nanocellulose, and
- b. surface treatment of the fibrous material with a solution comprising an organic acid or organic acid salt, to obtain a surface-treated fibrous material having a surface pH of at least 3 wherein the barrier properties of the surface-treated fibrous material is improved compared to the fibrous material.
A fibrous material having a surface pH above 3, the fibrous material comprising:
- nanocellulose and organic acid,
- wherein the fibrous material has a Water Vapor Transmission Rate (WVTR) value in a range of 1-20 cc/m2/24 h (38° C., 85% RH) according to ASTM F-1249 and a grammage between 10-50 gsm.
Dependencies are inferred from the claim text.