Cationically modified white pigments, their production and use

Details Cationically modified white pigments, their production and use Cationically modified white pigments, their production and use

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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