Paper coating compositions and organic pigments used therein

Details Paper coating compositions and organic pigments used therein Paper coating compositions and organic pigments used therein

1974-10-11

1976-04-27

Hayes, Lorenzo B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 294R, 260 39R, 260 69R, 106214, 106288Q, C08L 302, C08L 6120

Patent

active

039534219

ABSTRACT:
Improved aqueous slurry type coating colors for coating of paper, paperboard and the like are described in which there is incorporated along with the usual finely divided inorganic pigments, such as clay, an auxiliary pigment consisting of a substantially water-insoluble, cross-linked urea-formaldehyde pigment in highly dispersed particulate form. The urea-formaldehyde pigment constitutes from about 2 to 25% and preferably from about 3 to about 15% by weight of the total pigment solids in the coating colors. The BET specific surface area of the particulate urea-formaldehyde pigments ranges from about 40 to about 75 square meters per gram in which instance the average agglomerate size of the pigments ranges from about 2 to about 3.5 microns. In those instances where the BET specific surface area of the urea-formaldehyde pigments ranges from at least 15 to 40 square meters per gram, the average agglomerate size of the pigments ranges from about 2 to about 4 microns.

REFERENCES:
patent: 3320080 (1967-05-01), Mazzarella et al.
patent: 3553115 (1971-01-01), Curchod et al.
patent: 3836495 (1974-09-01), Berstein
patent: 3849378 (1974-11-01), Griffiths et al.
patent: 3850868 (1974-11-01), Wismer et al.

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