Papermaking process
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United States of America Patent
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Jun 22, 1993
Grant Date -
N/A
app pub date -
Sep 27, 1991
filing date -
Sep 27, 1991
priority date (Note) -
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Abstract
In a papermaking process a paper product is formed from a mineral filler containing cellulosic slurry. Retention performance is provided by the sequential addition of a cationic charge-biasing species, an anionic flocculant, and then a certain microparticle. A shear stage is interposed between the flocculant addition and the microparticle addition. The microparticle is a inorganic, cationic source of aluminum.
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