Process for dispersing organic pigments with ultrasonic radiation
AssigneeBASF SE
InventorByron G. Hays
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Abstract
Dispersions of organic pigments are produced by adding a surfactant to an aqueous slurry of an organic pigment followed by subjecting the slurry to ultrasonic radiation. The surfactant utilized is one or more of the surfactants selected from the group consisting of: 1. the acidic salt of N-alkyl-N,N',N'-trimethyl-1,3-propanediamine, 2. the acidic salt of N-alkyl-N,N',N'-tris(2-hydroxypropyl)-1,3-propanediamine, 3. N-alkyl-N,N,N',N',N'-pentamethyl-1,3-propanediamine dichloride, 4. the acidic salt of N-(N-alkyl-3-aminopropane)-N'-(3-aminopropane)-1,3-propanediamine wherein the alkyl group contains from about 12 to about 22 carbon atoms, and 5. a poly(ethyleneoxide) ether of an 18 carbon alcohol having 9 units of ethylene oxide thereon.
Claims26
A method of dispersing an organic pigment, the method comprising the steps of:
- (A) adding a surfactant to an aqueous slurry of an organic pigment, the surfactant being selected from the group consisting of
- 1. the acidic salt of N-alkyl-N,N',N'trimethyl-1,3-propanediamine,
- 2. the acidic salt of N-alkyl-N,N',N'tris(2-hydroxypropyl)-1,3-propanediamine,
- 3. N-alkyl-N,N,N',N',N'-pentamethyl-1,3,-propanediamine dichloride,
- 4. the acidic salt of N-(N-alkyl-3-aminopropane)-N'(3 aminopropane)-1,3propanediamine,
- wherein the alkyl group contains from about 12 to about 22 carbon atoms, and
- 5. a poly(ethyleneoxide) ether of an 18 carbon alcohol having 9 units of ethylene oxide thereon;
- (B) dispersing the pigment by subjecting the slurry to ultrasonic radiation.
Dependencies are inferred from the claim text.