Patent ID: 6599391
Filing Date: 2003-07-29
Classification: C01P,C09C,D21H

Abstract:
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 &mgr;m and 2 &mgr;m, and a length of between 10 &mgr;m and 400 &mgr;m; 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 &mgr;m and 3 &mgr;m.