Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
162 7, 162 8, D21B 108
A method for brightening fiber from colored waste paper comprising bleaching pulp from colored waste paper with sodium hydrosulfite, formamidine sulfinic acid, or hydrogen peroxide in the presence of a selected quaternary compound.
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Hamilton Glynn A.
Shepperd, III Paul W.
Czaja Donald E.
Hoechst Celanese Corporation
Miano Rosemary M.
Nguyen Dean T.
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