C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 11/46 (2006.01) C09C 1/02 (2006.01) D21H 17/67 (2006.01)
Patent
CA 2355027
Needle shape calcium sulphate dehydrate (CaSO4.cndot.2H2O) filler particles were prepared by mixing freshly calcined calcium sulphate hemihydrate (CaSO4.cndot.1/2H2O) having an average particle size between 1 and 100 micrometers, and water in a reactor at high sheer with either no additives or together with acids or with calcium- or sulphate- containing additives. The average length and width of the produced filler particles were 5-35 micrometers and 1-5 micrometers respectively. The calcium sulphate dehydrate filler particles were then treated by a calcium chelating agent, perhaps followed by the addition of a weak acid. The mixture was then held at 30- 90°C for 5-60min resulting in relatively water insoluble calcium sulphate dehydrate. The filler suspension can be directly added to the pulp furnish before the paper sheet formation to obtain a high filler retention and improved optical properties with minimal filler losses due to solubility. The resulting filler did not cause any operating difficulties on the paper machine and provided, depending on the filler level, a 2-15% decreased energy consumption in the drying section.
Kerr R. Bruce
Tolnai Balazs
Kerr R. Bruce
Kruger Inc.
Mccarthy Tetrault Llp
Tolnai Balazs
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