Pigment dispersion

• US 5,935,315 A
• Filed: 06/10/1998
• Issued: 08/10/1999
• Est. Priority Date: 12/14/1995
• Status: Expired due to Term

• Current Assignee: Akzo Nobel (Nouryon BV)
• Original Assignee: Akzo Nobel N.V. (Nouryon BV)
• Inventors: Bostrom, Peter
• Primary Examiner(s): GREEN, ANTHONY J
• Application Number:
  US09/095,332
• Time in Patent Office: 426 Days
• Field of Search: 106/499, 106/504, 106/493
• US Class Current: 106/499
• CPC Class Codes: C09B 67/0085 Non common dispersing agents
• CPC Class Codes: C09D 17/00 Pigment pastes, e.g. for mixing in paints artists' paints C09D5/06
• CPC Class Codes: C09D 7/45 Anti-settling agents
• CPC Class Codes: C09K 23/22 Amides or hydrazides

Abstract

The present invention relates to a low-viscosity pigment dispersion free from organic solvents and containing a fatty acid amidoalkoxylate as dispersing agent. The amidoalkoxylate is of the formula ##STR1## wherein R is an aliphatic hydrocarbon group having 7-22 carbon atoms, preferably 9-18 carbon atoms, A is an alkyleneoxy group having 2-3 carbon atoms, X is hydrogen or the group (A)_n H, wherein A has the meaning stated above, n is a number of 1-15, the sum of all n being 3-20. The pigment dispersion can be used in paints based on water as well as organic solvents.

Claims

1. A coloring pigment dispersion which is free from organic solvents comprises:

a) 1.0-65% by weight of a coloring pigment,

b) 4-20% by weight of a nonionic water-soluble or water-dispersible amidoalkoxylate surfactant of the formula ##STR4## wherein R is an aliphatic hydrocarbon group having 7-22 carbon atoms, A is an alkyleneoxy group having 2-3 carbon atoms, X is hydrogen or the group (A)_n H, wherein A has the meaning stated above, n is a number from 1-15, and the sum of all n is 3-20,

c) 15-86% by weight of water,

d) 0-20% by weight of a filler,

e) 0-5% by weight of an anionic and/or amphoteric surfactant, and

f) 0-2% by weight of a water-retaining polymer.

2. The pigment dispersion of claim 1 wherein the amidoalkoxylate is based on coconut oil fatty acids, rape-seed oil fatty acids or linseed oil fatty acids or mixtures thereof.

3. The pigment dispersion of claim 1 wherein at least 50% by weight of the amidoalkoxylate consists of compounds, wherein R is an aliphatic group having 8-13 carbon atoms.

4. The pigment dispersion of claim 1 wherein in formula (I), A is an ethyleneoxy group, n is a number of 4-15 and X is hydrogen.

5. The pigment dispersion of claim 1 wherein the coloring pigment is inorganic and the total number of ethyleneoxy groups in the amidoethoxylate is 8-15.

6. The pigment dispersion of claim 1 wherein the coloring pigment is organic and the total number of ethyleneoxy groups in the amidoethoxylate is 4-10.

7. The pigment dispersion of claim 1 which has a viscosity below 5000 cP and a pigment content of above 20% by weight.

8. The pigment dispersion of claim 1 which contains 0.2-4.0% by weight of an anionic and/or amphoteric surfactant containing at least one hydrocarbon group having 8-22 carbon atoms.

9. The pigment dispersion of claim 1 wherein R is an aliphatic hydrocarbon group having 9-18 carbon atoms.

10. A paint product which contains as binder a latex, an alkyd or a drying oil, and which comprises a coloring pigment dispersion according to claim 1.