Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2006-01-24
2006-01-24
Fortuna, José A. (Department: 1731)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C162S072000, C162S076000, C162S168500, C546S184000, C546S185000, C546S188000, C546S220000, C546S011000, C524S099000
Reexamination Certificate
active
06989449
ABSTRACT:
Selected chlorohydrin and cationic compounds containing nitroxide or hydroxylamine moieties are effective in stabilizing pulp or paper, especially pulp or paper containing lignin, against yellowing and discoloration due to the adverse effects of light. These compounds are added at various points in the paper-making process, especially at the wet ends, making the need for water soluble or water dispersible materials having high affinity for pulp or paper essential. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents and metal chelating agents. Combinations of hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective.
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Cunkle Glen T.
Devore David
Thompson Thomas F.
Ciba Specialty Chemicals Corporation
Fortuna Jos'e A.
Loggins Shiela A.
Stevenson Tyler A.
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