Paper filler composition
AssigneeFiberLean Technologies Limited
InventorsJohn Claude Husband, Per Svending, David Robert Skuse, Tafadzwa Motsi, Mikko Likitalo, Alan Coles
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Abstract
A method for preparing an aqueous suspension may include providing a fibrous substrate comprising cellulose having a Canadian Standard freeness equal to or less than 450 cm3, and microfibrillating the fibrous substrate in an aqueous environment by grinding in the presence of a grinding medium consisting essentially of mullite. The grinding may be carried out in the absence of grindable inorganic particulate material. The grinding medium may be present in an amount of at least about 10% by volume of the aqueous environment. The microfibrillated cellulose may have a fibre steepness of from about 20 to about 50.
Claims12
An aqueous composition comprising microfibrillated cellulose obtainable by a method comprising the steps of:
- providing a fibrous substrate comprising cellulose, wherein the fibrous substrate comprises cellulose having a Canadian Standard freeness equal to or less than 450 cm3;
- microfibrillating the fibrous substrate in an aqueous environment by grinding in the presence of a grinding medium consisting essentially of mullite, and
- wherein the grinding is carried out in the absence of grindable inorganic particulate matter,
- wherein the grinding medium is present in an amount of at least about 10% by volume of the aqueous environment, and
- wherein the microfibrillated cellulose has a fibre steepness of from about 20 to about 50.
Dependencies are inferred from the claim text.