Method of improving the brightness of calcium carbonate filled paper
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United States of America Patent
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Aug 5, 2003
Issued Date -
N/A
app pub date -
Jan 28, 1997
filing date -
Dec 28, 1994
priority date (Note) -
Expired
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Abstract
A method of improving the brightness of calcium carbonate filled paper. The filled paper is dried and then bleached with an aqueous solution of a bleaching agent. The process may be used on all grades of paper that contain filler and is particularly useful in the bleaching of low brightness grade papers that are produced from mechanical pulp that contain calcium carbonate.
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