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US 12,428,530 B2Granted
Method of making a cellulose film comprising microfibrillated cellulose
AssigneeStora Enso OYJ
InventorsOtto Nylén, Isto Heiskanen, Isabel Knöös
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Abstract
A method for making a cellulose film comprising microfibrillated cellulose (MFC) is provided, said method comprising the step of: applying an aqueous emulsion of one or more vegetable oils to a surface of a casting substrate. Improved release of the MFC film can thus be achieved.
Claims13
A method for making a cellulose film comprising microfibrillated cellulose (MFC), said method comprising the steps of:
- a. providing a casting substrate having at least one surface;
- b. applying an aqueous emulsion of one or more vegetable oils to said surface of said casting substrate to provide a treated surface;
- c. casting a film-forming composition on the treated surface of said casting substrate, said film-forming composition comprising MFC and a hydrophilic film-forming polymer, wherein said film-forming composition comprises 0.1-50 wt % of said hydrophilic film-forming polymer based on a total solids content of the film-forming composition, and wherein said hydrophilic film-forming polymer is selected from a group consisting of:
- polyvinyl alcohol (PVA), polyethylene glycol (PEG), and partly- or fully-hydrolysed derivatives thereof;
- d. drying the film-forming composition on the casting substrate to form the cellulose film comprising microfibrillated cellulose (MFC);
- and
- e. separating the cellulose film from the casting substrate.
4 more elements
Dependencies are inferred from the claim text.