Process of and composition for de-inking waste paper as well as paper reclaimed by said process
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United States of America Patent
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Dec 11, 1984
Issued Date -
N/A
app pub date -
Apr 6, 1984
filing date -
Jun 10, 1981
priority date (Note) -
Expired
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Abstract
The novel, advantageous, and economical process of reclaiming printed waste paper comprises subjecting waste paper to a flotation de-inking process. The degree of whiteness of the reclaimed paper is considerably increased by the addition of specific phosphonic acid compounds to the de-inking bath. Hydroxy carboxylic acids, amino carboxylic acids, polycarboxylic acids as well as magnesium sulfate may also be added to the de-inking bath containing the phosphonic acids.
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