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.
Claims30
A method of preparing a partially dried composition comprising microfibrillated cellulose and water, the method comprising the steps of:
- (a) microfibrillating a fibrous substrate comprising cellulose in an aqueous environment by grinding in the presence of grinding medium which is to be removed after completion of grinding, wherein the fibrous substrate comprising cellulose has a Canadian Standard freeness equal to or less than 450 cm3;
- wherein the grinding medium is present in an amount of at least about 10% by volume of the aqueous environment, to form an aqueous composition comprising microfibrillated cellulose and water, wherein the microfibrillated cellulose has a d50 by laser light scattering of from about 5 μm to about 500 μm and a fibre steepness of from about 20 to about 50;
- and (b) treating the aqueous composition comprising microfibrillated cellulose and water to remove at least about 50% by volume of the water to form a partially dried composition comprising microfibrillated cellulose and water.
Dependencies are inferred from the claim text.