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US 6,599,391 B2Granted
Filler for use in paper manufacture and procedure for producing a filler
AssigneeM-real Corporation
InventorsPetri Silenius, Markku Leskela
Life of this patent
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Abstract
The invention relates to a filler used in paper manufacture and mainly consisting of calcium carbonate, and to a procedure for producing the filler. The filler consists of porous aggregates formed by precipitated calcium carbonate particles. In the procedure, calcium carbonate is precipitated.
Claims17
A method for producing filler for use in paper manufacture, the method comprising steps of:
- (a) refining cellulose fibre, mechanical pulp fibre, or mixture of mechanical pulp fibre into fibrils, wherein:
- (i) the fibrils having a thickness of between 0.1 μm and 2 μm, and a length of between 10 μm and 400 μm;
- and
- (ii) the fibrils being detached from fibers;
- and
- (b) chemically precipitating calcium carbonate onto the surface of the fibrils to provide a porous aggregate of calcium carbonate precipitated onto the surface of fibrils, wherein:
- (i) the calcium carbonate on the fibrils have a diameter of between 0.2 μm and 3 μm.
4 more elements
Dependencies are inferred from the claim text.