Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2007-10-16
2007-10-16
Kiliman, Leszek (Department: 1773)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C428S404000, C428S405000, C428S406000, C428S407000, C106S400000, C106S410000, C106S412000, C106S411000, C524S088000
Reexamination Certificate
active
10478382
ABSTRACT:
A method of coloring a cellulosic material which includes a) dispersing pulped cellulosic material into water; and b) coloring the pulped cellulosic material by adding a cationic dispersion to the water, where the dispersion includes: (i) at least one pigment; (ii) water; and (iii) at least one acid salt of a styrene maleimide resin in an amount effective to disperse the pigment. The cationic dispersion may be prepared by (i) mixing, at 500 to 10,000 rpm, at least one pigment; water; and either (a) at least one acid salt of a styrene maleimide imide resin or (b) at least one styrene maleimide imide resin in combination with at least one weak acid, thereby forming a dispersion premix; (ii) milling the dispersion premix in a mixer filled with ceramic, metal or glass beads for a period of time sufficient to reduce pigment agglomerates to primary particles, thereby forming a nonstandarized dispersion; and (iii) standardizing the dispersion against a color standard by adding water. The resulting cationic dispersion can be used to color cellulosic materials such as cotton and paper.
REFERENCES:
patent: 4543128 (1985-09-01), Troesch et al.
patent: 4750936 (1988-06-01), West et al.
patent: 309908 (1988-09-01), None
patent: 05-331780 (1992-05-01), None
LaBazzo Joseph P.
Moore James E.
Perry Charles W.
Rasmusen Hans
Thorsson Jorn R.
Dickstein , Shapiro, LLP.
Kiliman Leszek
Sun Chemical Corporation
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