Aqueous pigment dispersion for light-shielding paper

Details Aqueous pigment dispersion for light-shielding paper Aqueous pigment dispersion for light-shielding paper

1997-03-31

1999-01-05

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524406, 524407, 524413, 524423, 524425, 524430, 524431, 524432, 524445, 524446, 524447, 524420, 524436, 524495, C08K 304, C08K 326, C08K 330, C08K 334

Patent

active

058563989

ABSTRACT:
There is provided an aqueous pigment dispersion for a light-shielding paper comprising a pigment component, an aqueous resin and water, wherein the pigment component contains 2 to 50% by weight of graphite in which at least 80% of the total number of particles thereof has the maximum diameter of 1 to 30 .mu.m, 2 to 60% by weight of a colored pigment, and 10 to 90% by weight of a white pigment, and each specific gravity of the colored pigment and the white pigment is 2.0 to 6.0 g/cm.sup.3. The pigment dispersion of the present invention can provide light-shielding properties by rendering coating onto a paper base material and also can provide a light-shielding paper which facilitates recycling and has a high quality when recycling of waste paper is effected.

REFERENCES:
patent: 4719038 (1988-01-01), Sobata et al.
patent: 5204401 (1993-04-01), Anderson, Jr. et al.
patent: 5378335 (1995-01-01), Hoppe-Hoffler et al.

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