Rheology improvers and pigment compositions having improved rheology
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United States of America Patent
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Dec 7, 2004
Issued Date -
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 (I) wherein R.sub.1 is methyl or ethyl, R.sub.2 is C.sub.6 -C.sub.24 alkyl, C.sub.6 -C.sub.24 alkenyl or C.sub.7 -C.sub.24 aralkyl, R.sub.3 and R.sub.4 are each independently of the other a chain consisting 1, 2 or 3 members, each member independently of any other(s) being (CH.sub.2)).sub.2 O--, --(CH.sub.2).sub.3 O--, CH(CH.sub.3)CH.sub.2 O--, --CH.sub.2 CH(CH.sub.3)--O-- or --CH.sub.2 CH(CH.sub.2 O--)O--and the chains being terminated by H, CH{character pullout}3, .sup.C 2.sup.H 5 ?or C(.dbd.O)CH.sub.3, m is a number from 0.3 to 1.0 and n is 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.
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