Optically whitened clay pigments

Details Optically whitened clay pigments Optically whitened clay pigments

1995-04-06

1996-12-24

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106402, 106413, 106445, 106447, 106460, 106465, 106471, 106479, 106486, 106487, 106490, 106491, 106499, 106285, 1621811, 1621816, 1621818, 523500, 523513, 523521, 524445, 524447, C04B 1400

Patent

active

055870112

ABSTRACT:
This invention involves a method of optically whitening clay minerals to transform their natural yellow tint to increased whiteness. Generally, it has been found that clay materials having low cation exchange capability can be directly reacted with very small amounts of cationic dyes, the apparent whiteness of said clay minerals being substantially increased thereby.

REFERENCES:
patent: 3545909 (1970-12-01), Gagliardi
patent: 3834924 (1974-09-01), Grillo
patent: 3880666 (1975-04-01), Remer
patent: 3897333 (1975-07-01), Field et al.
patent: 3950180 (1976-04-01), Kato
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patent: 4661164 (1987-04-01), Severinghaus, Jr.
patent: 4773936 (1988-09-01), Clark et al.
patent: 4877451 (1989-10-01), Winnick et al.
patent: 5131910 (1992-07-01), Breault
Kirk-Othmer Encyclopedia of Chemical Technology, 3rd Ed., vol. 10, pp. 500-506 and 520 "Flocculants" entry, 1982 no month available.
Encyclopedia of Polymer Science & Engineering, 2nd Ed., vol. 11, pp. 489-507, "Polyamines and Polyquaternary Ammonium Salts" Entry, Wiley and Sons, 1970 no month available.
McGraw Hill Encyclopedia of Science & Technology, 1066, vol. 10, pp. 223-224 (Pigments); vol. 4, pp. 297-298 (dyes), p. 307 (fluorescent brightness), 1987 no month available.
CAS 82(24):157176c, Abstract of DE 2,333,927, "Polyamide Mannich Bases as Flocking Agents", Jan., 1975.

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