Rheology improvers and pigment compositions having improved rheology
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United States of America Patent
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Dec 7, 2004
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N/A
app pub date -
Jun 10, 2003
filing date -
Dec 13, 2000
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Abstract
The invention relates to a compound of the 1-aminoanthraquinone, anthanthrone, anthrapyrimidine, quinacridone, dioxazine, diketopyrrolopyrrole, flavanthrone, indanthrone, isoindolinone, isoviolanthrone, perinone, perylene, phthalocyanine, pyranthrone or thioindigo series, which compound has one or more sulfonate groups of formula (1) wherein R.sub.1 is methyl or ethyl, R{character pullout}2, .sup.R 3? and R.sub.4 are each independently of the others C.sub.6 -C.sub.24 alkyl or C.sub.6 -C.sub.24 alkenyl, m is a number from 0.3 to 1.0 and n is a number from 0 to (1.0 m), the compound being suitable for use as a pigment dispersant and rheology improver. Also claimed are modified pigments having that compound on their surface, and also pigment compositions and dispersions comprising that compound. ##STR1##
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