Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1993-04-12
1994-04-05
Bell, Mark L.
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621811, 1621817, 162DIG9, 106457, 106466, 106481, 106483, 106492, 423311, D21H 1769, D21H 1701
Patent
active
053001478
ABSTRACT:
A method for producing a low-structure magnesium silicate SLR product useful to lower the strike through of low brightness paper products comprises adding a raw mineral source of soluble magnesium ions and sulfuric acid in a proportion and under conditions effective to form a slurry comprising soluble magnesium sulfate and a silica leach residue (SLR), and adding to the slurry a solution of an alkali metal silicate in a molar equivalent proportion of MgO:SiO.sub.2 of 1:2.0-4.0 under conditions effective to precipitate the magnesium ions and form a product comprising a low-structure magnesium silicate and SLR having a proportion of SiO.sub.2 MgO:SLR of 50-75%:5-12%:10-50% by weight of the product.
A low-structure magnesium silicate SLR filler comprises 50 to 75 wt % SiO.sub.2, 5 to 12 wt % MgO, 10 to 50 wt % SLR, 0 to 6 wt % Fe.sub.2 O.sub.3, and 0 to 7 wt % Al.sub.2 O.sub.3, wherein the proportion MgO:SiO.sub.2 is 1:2.0-4.0.
A paper product comprises at least an amount of the filler of the invention.
A method of reducing the strike through of a paper product comprises adding 0.001 to 8 wt % of the filler described above to a paper to form a low-brightness, low-strike through paper product.
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Heikkila Kaarina
Martensson Leif B.
Bell Mark L.
Flanders Harold H.
Hertzog Scott L.
J. M. Huber Corporation
Price Robert L.
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