Pigment disperser and easily dispersed solid pigment preparations
View Patent ↗The invention relates to reaction products of amines with polymers containing dicarboxylic acids anhydride groups, method for the production thereof and use thereof as a dispersing additive for pigments. The invention also relates to solid pigment preparations containing said reaction products.
1. A copolymer consisting of the following structural units:
0 to 20 mol % of structural unit A
0 to 20 mol % of structural unit B
1 to 79 mol % of structural unit C
1 to 79 mol % of structural unit D
and
20 to 80 mol % of structural unit E
wherein
R 1 and R 2 are each independently hydrogen, methyl or methylene,
a, b are each zero or one and a+b is one,
R 3 is, C 8 -C 30 -alkenyl, benzyl or N-propylene imidazole,
X and Y are each independently —OH, —O—C 1 -C 30 -alkyl, NR 4 R 5 or —O − N + H 2 R 4 R 5 ,
R 4 and R 5 are each independently hydrogen, R 3 or R,
R is
Z is C 2 -C 4 -alkylene,
n is a number between 1 and 1000,
R 6 is hydrogen, C 1 -C 30 -alkyl, C 5 -C 12 -cycloalkyl or C 6 -C 30 -aryl,
R 7 is hydrogen or C 1 -C 4 -alkyl,
R 8 is hydrogen or C 1 -C 4 -alkyl, and
R 9 is C 1 -C 60 -alkyl or C 6 -C 10 -aryl.
2. The copolymer as claimed in claim 1 , wherein the copolymer is a styrene-maleic anhydride resin and wherein the molar ratio of maleic anhydride to styrene is between 1:1 and 1:3.
3. The copolymer as claimed in claim 1 , wherein R 3 is oleyl or stearyl.
4. A process for preparing a copolymer as claimed in claim 1 comprising the step of reacting a polymer comprising dicarboxylic anhydride groups and the structural units E with a mixture of the amines H 2 N—Z—(OCHR 7 —CH 2 ) n —O—R 6 and H 2 N—R 3 and at least one component selected from the group consisting of water, the alcohol of the formula HO—(C 1 -C 30 )-alkyl, an amine of the formula HNR 4 R 5 and a combination thereof.