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US 10,883,226 B2Granted
Process for producing microfibrillated cellulose and a product thereof
AssigneeKemira Oyj
InventorsKari Vanhatalo, Tom Lundin, Marcus Lillandt
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Abstract
The present invention relates to a method of producing microfibrillated cellu-lose (MFC) comprising (i) providing cellulosic material, (ii) drying the cellulosic material so that specific surface area (SSA), when measured with BET-method, is at most 10 m2/g, and (iii) subjecting the dried cellulosic material to mechanical treatment. The present invention additionally relates to microfibril-lated cellulose produced with the method of the present invention.
Claims14
A method of producing microfibrillated cellulose (MFC) comprising:
- (i) providing a cellulosic material, which is microcrystalline cellulose,
- (ii) drying the cellulosic material by spray drying, flash drying, fluid bed drying or rotary drum drying, wherein the drying time is less than 5 minutes, until a specific surface area (SSA), when measured with Brunauer-Emmett-Teller (BET)-method, of the cellulosic material is at most 10 m2/g, and a size of the dried cellulosic material is less than 50 μm, and
- (iii) subjecting the dried cellulosic material to mechanical treatment, which refines the cellulosic material to microfibrillated cellulose.
Dependencies are inferred from the claim text.