Patent ID: 11920297
Assignee: STORA ENSO OYJ
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC C  D  B | IPC D

Claim 0:
1. 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 surface-treated fibrous material has a Water Vapour Transmission Rate (WVTR) value in a range of 1-30 cc/m2/24 h (23° C., 50% RH) according to ASTM F-1249 at a grammage between 10-50 gsm.