Paper making and fiber liberation – Processes and products – With coating after drying
Reexamination Certificate
2005-06-28
2005-06-28
Chin, Peter (Department: 1731)
Paper making and fiber liberation
Processes and products
With coating after drying
C106S448000, C106S465000, C106S471000, C106S499000, C162S158000, C162S162000, C162S164300, C162S164600
Reexamination Certificate
active
06911116
ABSTRACT:
Cationically modified white pigments (W) in particulate form, essentially consisting of a particulate inorganic white pigment (M) of a particle size in the range of 0,1 to 40 μm and an applied water soluble, cationic, crosslinked polymer (PA) containing quaternary ammonium groups in salt form, obtainable by reaction of epichlorohydrin or of epichlorohydrin derivatives or precursors with amines, under conditions leading to at least partial crosslinking, optionally in combination with an anionic optical brightener (B) and where the molar ratio of (B) to (PA) is such that the number of cationic charges of the total polymer (PA) is higher than the number of anionic charges of the total anionic optical brightener (B), are surprisingly useful as cationic white pigments in various fields of technique, especially in papermaking.
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Farrar John Martin
Jackson Andrew Clive
Tindal Alec Stewart
Bisulca Anthony A.
Chin Peter
Clariant Finance (BVI) Limited
Hanf Scott E.
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