Pigments for paper coating compositions

Details Pigments for paper coating compositions Pigments for paper coating compositions

D - Textiles, Paper

21

H

D21H 19/38 (2006.01) C09C 1/02 (2006.01) C09C 1/28 (2006.01) C09C 1/42 (2006.01) D21H 19/40 (2006.01) D21H 21/52 (2006.01) B41M 5/00 (2006.01)

Patent

CA 2189179

An inorganic particulate material suitable for use as a pigment material in a paper coating composition has a particle size distribution which when represented as a graph of percentage of weight of particles having an equivalent spherical diameter (esd) defined hereinafter of given size versus particle esd expressed in microns and plotted on a logarithmic base 10 scale has the following features: (a) a first peak at the coarse particle size and a second peak at a finer particle size and a dip or trough between the first and second peaks, the mean particle size x1 of the particles making up the first peak being in the range 2 microns to 4 microns; and (b) the relationship between the said first and second peaks being such that the value of the mean particle size x2 of the particles making up the second peak is separated in the said particle size distribution graph from the value of x1 by at least 0.5. The said material may be produced by mixing a coarse pigment material and a fine pigment material having appropriate particle size distribution. The coarse material is preferably calcium carbonate. The fine material may be any one or more coating composition incorporating the particulate material may be used for coating paper for various applications including ink jet printing, matt surfaced paper for offset printing and coated newsprint.

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