Easily dispersible solid pigment preparations
View Patent ↗The present invention relates to solid pigment preparations containing (A) 5 to 99 percent by weight of at least one pigment; (B) 1 to 95 percent by weight of at least one water-soluble dispersing additive based on copolymers that consist of the following structural units: (i) 1.0 to 50 mol percent of structural unit B1; a combined total of 50 to 99.0 mole percent of structural units (B2) and (B3); (iii) 0 to 49 mole percent of structural unit (B4).
1. A solid pigment preparation comprising
(A) from 5% to 99% by weight of at least one pigment other than C.I. Pigment Blue 15:3,
(B) from 1% to 95% by weight of at least one water-soluble dispersing additive based on copolymers consisting of the following structural units:
(i) from 1.0 to 50 mol % of structural unit B1
(ii) from 50 to 99.0 mol % of structural units B2 and B3 in a total whereof
from 0 to 100 mol % of said structural unit B2 and
from 0 to 100 mol % of said structural unit B3 can be present,
(iii) from 0 to 49 mol % of structural unit B4
where
R 1 , R 4 , R 6 and R 8 are each independently hydrogen or C 1 -C 4 -alkyl,
R 2 is a covalent bond, C 1 -C 4 -alkylene, C 1 -C 4 -alkylene-C 6 -C 12 -arylene, C 6 -C 30 -arylene or the radical
R 3 is hydrogen, Na + , K + or N(R 1 ) 4 + ,
R 5 and R 7 are each independently C 1 -C 40 -alkyl, C 5 -C 30 -cycloalkyl, C 1 -C 4 -alkylene-C 6 -C 12 -aryl or C 6 -C 30 -aryl, and
R 9 is hydrogen, C 1 -C 40 -alkyl, C 5 -C 30 -cycloalkyl, C 6 -C 30 -aryl, C 1 -C 4 -alkylene-C 6 -C 12 -arylene, —F, —Cl, —Br, —OH or —CN,
and wherein the aryl optionally substituted with C1-C4-alkyl;
(C) from 0% to 30% by weight of an auxiliary selected from the group consisting of fillers, flame retardants, preservatives, photoprotectants, pigmentary dispersants, nonpigmentary dispersants, surfactants, antioxidants, defoamers, resins and antistats,
all based on the total weight of the pigment preparation,
and wherein the sulfonate group content of (B1) is greater than 1 μmol and less than 100 μmol per gram of solid pigment preparation.
2. The pigment preparation as claimed in claim 1 , wherein the concentration of the at least one pigment (A) is in the range of 40% to 99% by weight, based on the total weight of the pigment preparation.
3. The pigment preparation as claimed in claim 1 , wherein the concentration of the at least one dispersing additive (B) is in the range of 1% to 60% by weight, based on the total weight of the pigment preparation.
4. The pigment preparation as claimed in claim 1 , wherein said structural unit (B1) comprises from 5 to 30 mol %.
5. The pigment preparation as claimed in claim 1 , wherein the sum total of said structural units (B2)+(B3) comprises from 60 to 95 mol %.
6. The pigment preparation as claimed in claim 1 , wherein said structural unit (B4) comprises from 1 to 20 mol %.
7. The pigment preparation as claimed in claim 1 , wherein the sulfonate group content of (B1) is in the range from 3 to 98 μmol/g.
8. The pigment preparation as claimed in claim 1 , wherein the at least one pigment is an organic pigment selected from the group consisting of monoazo, disazo, laked azo, β-naphthol, the condensation product of beta-hydroxynaphthoic acid and aniline, benzimidazolone, disazo condensation, azo metal complex pigments, phthalocyanine, except C. I. Pigment Blue 15:3, quinacridone, perylene, perinone, thioindigo, anthanthrone, anthraquinone, flavanthrone, indanthrone, isoviolanthrone, pyranthrone, dioxazine, quinophthalone, isoindolinone, isoindoline and diketopyrrolopyrrole pigments and acidic to alkaline carbon blacks selected from the group consisting of furnace blacks and gas blacks.
9. The pigment preparation as claimed in claim 1 , comprising said structural unit (B3), where said structural unit B3 R 7 is branched C 4-18 -alkyl.
10. A process for producing a solid pigment preparation as claimed in claim 1 , comprising the steps of mixing a pigment in the form of powder, granulate or presscake with at least one water-soluble dispersing additive (B) in the presence of water or an organic solvent or a mixture of water and organic solvent and isolating the pigment preparation in solid form.
11. The process for producing a solid pigment preparation as claimed in claim 10 , wherein the pigment preparation is isolated in solid form by filtration, drying and subsequent grinding.
12. The process for producing a solid pigment preparation as claimed in claim 10 , wherein the pigment preparation is isolated in solid form by spray drying.
13. A pigmented or colored natural or synthetic material pigmented or colored by a solid pigment preparation as claimed in claim 1 .
14. The pigmented or colored natural or synthetic material as claimed in claim 13 , wherein the natural or synthetic material is aqueous paints, emulsion and varnish colors, water-thinnable varnishes, wallpaper colors or printing inks.
15. The pigmented or colored natural or synthetic material as claimed in claim 13 , wherein the natural or synthetic material is solvent-containing paints, emulsion, colors varnish colors, wallpaper colors or printing inks.