Dry pigment preparations comprising non-ionic additives
View Patent ↗The invention relates to a pigment preparation containing (i) at least one organic and/or inorganic pigment, (ii) a dispersant that can be obtained by the polmerization of monomers [A], [B], [C] and [D], where [A] is a monomer of formula (I) wherein A is C2-C4 alkylene and B is a C2-C4 alkylene different from A, and R is hydrogen or methyl, [B] is a monomer of formula (II) wherein D is C 3 alkylene, R is hydrogen or methyl, and o is a number between 2 and 500, [C] is an ethylenically unsaturated monomer containing an aromatic group; and [D] is an ethylenically unsaturated monomer containing an alkyl radical.
1. A pigment formulation comprising
(i) at least one organic pigment, at least one inorganic pigment or a mixture thereof,
(ii) a dispersant obtained by polymerization of monomers [A], [B], [C] and [D], wherein
[A] is a monomer of the formula (I)
wherein
A is a C 2 - to C 4 -alkylene and
B is a C 2 - to C 4 -alkylene other than A,
R is hydrogen or methyl,
m is from 1 to 500;
n is from 1 to 500,
subject to the proviso that the sum of m+n equals 2 to 1000;
[B] is a monomer of the formula (II)
wherein
D is a C 3 -alkylene and
R is hydrogen or methyl,
o is from 2 to 500;
[C] is an ethylenically unsaturated monomer containing an aromatic group; and
[D] is an ethylenically unsaturated monomer containing an alkyl radical wherein monomer [C] is a compound of the formula (IIIa) or (IIIb):
wherein
X a is an aromatic or araliphatic radical having 3 to 30 carbon atoms, optionally containing heteroatoms selected from the group consisting of N, O and S,
Z a is H or (C 1 -C 4 )-alkyl,
Z b is H or (C 1 -C 4 )-alkyl, and
Z c is H or (C 1 -C 4 )-alkyl;
wherein
R 1 is hydrogen or methyl,
X b is an aromatic or araliphatic radical having 3 to 30 carbon atoms, optionally containing heteroatoms selected from the group consisting of N, O and S,
W a is an oxygen or an NH group and wherein monomer [D] is a compound of the formula (IV):
R 2 is hydrogen or methyl,
Y is an aliphatic hydrocarbyl radical having 1 to 30 carbon atoms, optionally linear, branched or cyclic, and optionally contains heteroatoms selected from the group consisting of O, N and S, and optionally is unsaturated,
W b is oxygen or an NH group.
2. The pigment formulation as claimed in claim 1 , containing in the dry state from 30% to 90% by weight of component (i).
3. The pigment formulation as claimed in claim 1 , containing in the dry state from 0.1% to 30% by weight of component (ii).
4. The pigment formulation as claimed in claim 1 , containing
component (i) 60% to 85% by weight,
component (ii) 10% to 30% by weight,
all based on the total weight of the dry pigment formulation.
5. The pigment formulation as claimed in claim 1 , wherein the organic pigment is selected from the group consisting of a monoazo, disazo, laked azo, β-naphthol, Naphthol AS, benzimidazolone, disazo condensation, azo metal complex pigment, phthalocyanine, quinacridone, perylene, perinone, thioindigo, anthanthrone, anthraquinone, flavanthrone, indanthrone, isoviolanthrone, pyranthrone, dioxazine, quinophthalone, isoindolinone, isoindoline, diketopyrrolopyrrole pigment and a carbon black.
6. The pigment formulation as claimed in claim 1 , wherein the alkylene oxide units (A-O) m and (B—O) n of the [A] monomer are present in blocks.
7. A process for preparing a pigment formulation as claimed in claim 1 , comprising the steps of dispersing component (i) in the form of powder, granulate or aqueous presscake in the presence of water and component (ii) and optionally dried.
8. A natural or synthetic material dyed or pigmented with the pigment formulation as claimed in claim 1 .
9. A pigmented aqueous paint, emulsion, varnish color or solvent-containing varnish pigmented with the pigment formulation as claimed in claim 1 .