WO2007128388A2

WO2007128388A2 - Low-voc humectant for aqueous pigment preparations

Info

Publication number: WO2007128388A2
Application number: PCT/EP2007/003427
Authority: WO
Inventors: Hendrik Ahrens; Jochem Effing
Original assignee: Clariant International Ltd
Priority date: 2006-05-06
Filing date: 2007-04-19
Publication date: 2007-11-15
Also published as: DE102006021178A1; EP2024445A2; WO2007128388A3

Abstract

The invention relates to aqueous pigment preparations comprising, in addition to a colour-imparting organic or inorganic pigment, 0.1% to 20% by weight of a humectant having a VOC content of not more than 5% by weight as determined according to DIN EN ISO 11890-2, the humectant comprising at least one polyalkylene glycol obtainable by subjecting 1 to 500 mol of C2 to C4 alkylene oxide with a water content of less than 1% by weight to addition reaction with a starting alcohol having 1 to 6 carbon atoms and 1 to 6 hydroxyl groups, with a water content of less than 1% by weight.

Description

description

Low-VOC humectants for aqueous pigment preparations

The present invention relates to aqueous pigment preparations containing humectants with low levels of volatile compounds.

Humectants are added to aqueous pigment preparations to prevent premature drying of the preparations on the surface.

In particular at higher temperatures, for example 60 ^° C., solid cakes or a skin form on the surface of the pigment preparation. When storing the pigment preparations in containers with an air space, the water evaporates and the pigment preparation concentrates on. Since pigment preparations usually already contain high pigment concentrations, the evaporation of the water further concentrates the pigment preparation, which leads to a further increase in the viscosity, so that a skin or a solid cake is formed. Humectants bind the water and thus prevent the pigment preparation from drying out. Furthermore, moisturizers have the task of forming uniform films when the preparations dry. Such pigment preparations are used as tinting pastes in architectural paints, as pigment pastes in the dyeing of textiles, for example polyester fibers, as printing inks for printing on paper, textile and other surfaces and as ink jet inks in non-contact printing processes.

Common humectants are polyalkylene glycols and mixtures thereof.

DE-100 42 900 and DE-A-198 42 952 disclose humectants for pigment preparations. Suitable as such are polyhydric alcohols, in particular containing 3 to 8 carbon atoms, such as glycerol, erythritol, pentaerythritol, pentitols such as arabitol, adonite and xylitol, hexitols such as sorbitol, mannitol and duleite. Also suitable are polyalkylene glycols and polyalkylene glycol monoalkyl ethers, in particular having an average molecular weight of from 100 to 1500. Als Examples thereof are di-, tri- and tetraethylene glycol, diethylene glycol monomethyl, -ethyl, propyl and butyl ethers and trimethylene glycol monomethyl, ethyl, propyl and butyl ethers. Also suitable are pyrrolidones and N-alkylpyrrolidones, such as N-methylpyrrolidones. The proportion of the humectant in the colorant preparations is usually 0 to 15 wt .-%. Also suitable as humectants are thioether analogues of several glycols.

A disadvantage of relatively high molecular weight polyalkylene glycols is that, with their increasing molecular weight, the viscosity of the pigment preparations also increases, which results in a difficult dosage and eligibility of the pigment

Pigment preparation leads. Therefore, it is preferable to use polyalkylene glycols having a low molecular weight as a humectant. However, these show an increased content of volatile organic compounds (VOC, volatile organic compounds). These pollute people and the environment through odor and toxicity and are considered to be the cause of ozone pollution in cities under sunlight. Your avoidance is therefore desirable. The VOC content in paints and coatings is determined according to DIN EN ISO 11890-2, according to which all substances with a boiling point of less than 25O ⁰ C are considered VOCs and their proportions are summed.

Low molecular weight polyalkylene glycols have a boiling point of less than 250 ^° C. or contain larger amounts of volatile organic compounds having a boiling point of less than 250 ^° C. Polyalkylene glycols having a higher molecular weight also contain byproducts, raw materials, auxiliaries such as catalysts and acids and in polymers low molecular weight homologues which have a boiling point of less than 250 ⁰ C and are therefore detected as volatile organic compounds.

It is an object of the present invention to provide humectants which, while not substantially increasing the viscosity of the pigment preparation, contain a low level of VOC.

The invention relates to aqueous pigment preparations containing in addition O

a coloring inorganic or organic pigment 0.1 to 20 wt .-% of a humectant with a determined according to DIN EN ISO 11890-2 VOC content of at most 5 wt .-%, wherein the humectant comprises at least one polyalkylene glycol by addition of From 1 to 100 moles of C ₂ to C ₄ alkylene oxide having a water content of less than 0.1% by weight of a starting alcohol having from 1 to 6 carbon atoms and from 1 to 6 hydroxyl groups having a water content of less than 1% by weight .-%, can be obtained.

Another object of the invention is the use of at least one polyalkylene glycol, by addition of 1 to 100 moles of C ₂ - to C ₄ alkylene oxide having a water content of less than 1 wt .-%, to a starting alcohol having 1 to 6 Carbon atoms and 1 to 6 hydroxyl groups, which has a water content of less than 1 wt .-%, can be obtained as a humectant with a determined according to DIN EN ISO 11890-2 VOC content of at most 5 wt .-% for preparations of inorganic or organic pigments.

A further subject matter is a process for preparing preparations of inorganic or organic pigments by subjecting an inorganic or organic pigment 0.1 to 20 wt .-%, based on the finished preparation of a humectant with a determined according to DIN EN ISO 11890-2 VOC Content of not more than 5% by weight, the humectant comprising at least one polyalkylene glycol obtained by addition of 1 to 100 moles of C ₂ to C ₄ alkylene oxide having a water content of less than 1% by weight to a Starting alcohol having 1 to 6 carbon atoms and 1 to 6 hydroxyl groups, which has a water content of less than 1 wt .-%, can be obtained added.

Suitable polyalkylene glycols are obtained by controlling the molecular weight and by selecting the starting alcohols, catalysts and acids and by a particular purity of the raw materials.

Suitable polyalkylene glycols are prepared by anionic polymerization of preferably 3 to 80, especially 4 to 50, especially 5 to 30, and especially preferably 6 to 15 mol of C ₂ - to C ₄ -alkylene oxides per mole of starting alcohol. Preferred as the alkylene oxide is ethylene oxide or propylene oxide. Suitable starting alcohols are monoethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, glycerol, pentaerythritol, polyhydric alcohols having 2 to 6 carbon atoms and 2 to 6 hydroxyl groups, methanol, ethanol, propanol, butanol and pentanol.

In particular, suitable humectants are polyethylene glycol having an average molecular weight of 400 g / mol, polyethylene glycol monomethyl ether having an average molecular weight of 500 g / mol, or a glycerol ethoxylate having an average molecular weight of 350 g / mol. For all polyalkylene glycols according to the invention, the molecular weight thereof is preferably at least 300 g / mol, in particular at least 350 g / mol and particularly preferably at least 400 g / mol. The preferred upper limit of the average molecular weight is 4,000 g / mol, in particular 2,000 g / mol, especially 1,000 g / mol. References to average molecular weights refer to weight average molecular weights.

By using anhydrous or low-water starting alcohols having water contents of below 1 wt .-%, preferably below 0.1 wt .-%, in particular below 50 ppm and / or low-water alkylene oxides, such as low-water ethylene oxide, the polyalkylene glycols according to the invention can be prepared. The water content of the alkylene oxides used, in particular of the ethylene oxide used, is preferably less than 0.1% by weight, in particular less than 500 ppm and more preferably less than 100 ppm.

Suitable catalysts are alkali metal and alkaline earth metal hydroxides, in particular sodium hydroxide, potassium hydroxide and calcium hydroxide. The catalysts are preferably dried after the reaction with the starting alcohol in order to obtain an as anhydrous system as possible and to obtain a small proportion of low molecular weight homologs of the polyalkylene glycols, which would be mitergestasst as VOC. Another measure to Preparation of polyalkylene glycols as low-VOC humectants is the control of the molecular weight and molecular weight distribution of the polyalkylene glycols. By a narrow molecular weight distribution, the proportion of low molecular weight compounds can be reduced, resulting in a lower proportion of VOCs counting constituents of the polyalkylene glycols.

Suitable acids for neutralizing the catalysts, which is required to complete the alkoxylation, usually organic acids are used, which may have a boiling point of less than 25O ⁰ C in neutralized form in the gas chromatograph and thus are detectable as VOC. The selection of the acids is such that the sum of all components counted to the VOC does not exceed the desired limit. Acetic acid, propionic acid, lactic acid, citric acid and higher molecular weight organic carboxylic acids, in particular isooctanoic acid, isononanoic acid, isodecanoic acid, lauric acid, myristic acid, hexadecanoic acid, octadecanoic acid and octadecenoic acid are used for neutralization. However, inorganic acids are particularly suitable for the neutralization of the catalysts used, since these can not be counted among the volatile organic compounds, for example boric acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphorous acid, hypophosphorous acid and hydrochloric acid, sulfuric acid and phosphoric acid being considered to be particularly suitable ,

The polyalkylene glycols may be further hydrotrope substances added. Hydrotropes, which optionally also serve as solvents, can be, for example, formamide, urea, tetramethylurea, ε-caprolactam, methyl cellosolve, glycerol, N-methylpyrrolidone, 1,3-diethyl-2-imidazolidinone, thiodiglycol, sodium benzenesulfonate, sodium xylenesulfonate, Sodium toluenesulfonate, sodium cumenesulfonate, sodium dodecylsulfonate, sodium benzoate, sodium salicylate or sodium butylmonoglycol sulfate. However, it is decisive that the moisturizer composed of polyalkylene glycols and other hydrotropic substances has a VOC content of at most 5% by weight determined in accordance with DIN EN ISO 11890-2. The VOC content of the humectant is in particular below 1%, preferably below 0.5% and particularly preferably below 0.3%. The VOC content of the aqueous pigment preparations is in particular below 3%, preferably below 1%, especially below 0.5% and particularly preferably below 0.1% (all statements by weight based on the weights of the humectants or pigment preparations).

The pigment preparations according to the invention are used for tinting and dyeing paints and coatings and in particular aqueous emulsion paints. Usual amounts of the pigment preparations of the invention are 0.1 to 20% by weight, based on the color. Preference is given to tinting aqueous emulsion paints with the pigment preparations according to the invention. Furthermore, aqueous silicate paints, aqueous silicone paints, solventborne and aqueous alkyd paints, epoxy paints, one- or two-component polyurethane coatings and melamine-formaldehyde stoving enamels and all aqueous or solvent-borne paints and coatings used for architectural paints are colored with the pigment preparations of the invention.

The pigment preparations according to the invention are also used as colorants for coloring paper, as printing pastes for textile printing, as printing inks for paper printing and as ink jet inks.

The pigment preparations according to the invention preferably contain the following ingredients:

Components A 0.1-75% by weight of one or more organic and / or inorganic pigments

Components B 0.1-20% by weight of one or more wetting and dispersing agents

Components C 0.1-20% by weight and preferably 5-15% by weight of one or more humectants Components D optionally one or a combination of several

Preservative components E optionally resins, polymers, thickeners, dyes,

Complexing agents, defoamers and degassing agents, antioxidants, solvents and others in

Pigment preparations used adjuvants component F water ad 100 wt .-%.

Monoazo, disazo, laked azo, naphthol, naphthol AS, benzimidazolone, disazo condensation, azo metal complex pigments and polycyclic pigments, such as e.g. Phthalocyanine, quinacridone, perylene, perinone, thioindigo, anthanthrone, anthraquinone, flavanthrone, indanthrene, isoviolanthrone, pyranthrone, dioxazine, quinophthalone, isoindolinone, isoindoline and diketopyrrolopyrrole pigments or carbon blacks into consideration.

As an exemplary selection of particularly preferred organic pigments are carbon black pigments, such as gas or Furnaceruße; Monoazo and disazo pigments, in particular the Color Index Pigments Pigment Yellow 1, Pigment Yellow 3, Pigment Yellow 12, Pigment Yellow 13, Pigment Yellow 14, Pigment Yellow 16, Pigment Yellow 17, Pigment Yellow 73, Pigment Yellow 74, Pigment Yellow 81, Pigment Yellow® 83, Pigment Yellow® 87, Pigment Yellow® 97, Pigment Yellow® 111, Pigment Yellow® 126, Pigment Yellow® 127, Pigment Yellow® 128, Pigment Yellow® 155, Pigment Yellow® 174, Pigment Yellow® 176, Pigment Yellow® 191, Pigment Yellow® 213, Pigment Yellow 214, Pigment Red 219, Pigment Red 38, Pigment Red 144, Pigment Red 214, Pigment Red 242, Pigment Red 262, Pigment Red 266, Pigment Red 269, Pigment Red 274, Pigment Orange 13, Pigment Orange 34 or Pigment Brown 41; Naphthol and naphthol AS pigments, in particular the Color Index pigments Pigment Red 2, Pigment Red 3, Pigment Red 4, Pigment Red 5, Pigment Red 9, Pigment Red 12, Pigment Red 14, Pigment Red 53: 1, Pigment Red 112, Pigment Red 146, Pigment Red 147, Pigment Red 170, Pigment Red 184, Pigment Red 187, Pigment Red 188, Pigment Red 210, Pigment Red 247, Pigment Red 253, Pigment Red 256, Pigment Orange 5, Pigment Orange 38 or Pigment Brown 1; laked azo and Metal complex pigments, in particular the Color Index pigments Pigment Red 48: 2, Pigment Red 48: 3, Pigment Red 48: 4, Pigment Red 57: 1, Pigment Red 257, Pigment Orange 68 or Pigment Orange 70; Benzimidazoline pigments, in particular the Color Index pigments Pigment Yellow 120, Pigment Yellow 151, Pigment Yellow 154, Pigment Yellow 175, Pigment Yellow 180, Pigment Yellow 181, Pigment Yellow 194, Pigment Red 175, Pigment Red 176, Pigment Red 185, Pigment Red 208 , Pigment Violet 32, Pigment Orange 36, Pigment Orange 62, Pigment Orange 72 or Pigment Brown 25; Isoindolinone and isoindoline pigments, in particular the Color Index pigments Pigment Yellow 139 or Pigment Yellow 173; Phthalocyanine pigments, in particular the Color Index pigments Pigment Blue 15, Pigment Blue 15: 1, Pigment Blue 15: 2, Pigment Blue 15: 3, Pigment Blue 15: 4, Pigment Blue 15: 6, Pigment Blue 16, Pigment Green 7 or Pigment Green 36; Anthanthrone, anthraquinone, quinacridone, dioxazine, indanthrone, perylene, perinone and thioindigo pigments, in particular the Color Index Pigments Pigment Yellow 196, Pigment Red 122, Pigment Red 149, Pigment Red 168, Pigment Red 177, Pigment Red 179, Pigment Red 181, Pigment Red 207, Pigment Red 209, Pigment Red 263, Pigment Blue 60, Pigment Violet 19, Pigment Violet 23 or Pigment Orange 43; Triarylcarboniumpigmente, in particular the Color Index pigments Pigment Red 169, Pigment Blue 56 or Pigment Blue 61; Diketopyrrolopyrrolpigmente, in particular the Color Index pigments Pigment Red 254, Pigment Red 255, Pigment Red 264, Pigment Red 270, Pigment Red 272, Pigment Orange 71, Pigment Orange 73, Pigment Orange 81, call.

The organic pigment is preferably combined with carbon black and / or titanium dioxide.

Also suitable are laked dyes such as Ca, Mg, Al lacquers of dyes containing sulfonic acid and / or carboxylic acid groups.

Examples of suitable inorganic pigments are titanium dioxides, zinc sulfides, zinc oxides, iron oxides, magnetites, manganese iron oxides, chromium oxides, ultramarine, nickel or chromium antimony titanium oxides, manganese titanium rutiles, cobalt oxides, mixed oxides of cobalt and aluminum, rutile mixed phase pigments, rare earth sulfides, spinels of cobalt with nickel and zinc, spinels based on iron and chromium with copper zinc, and manganese, bismuth vanadates and extender pigments. In particular, Color Index Pigments Pigment Yellow 184, Pigment Yellow 53, Pigment Yellow 42, Pigment Yellow Brown 24, Pigment Red 101, Pigment Blue 28, Pigment Blue 36, Pigment Green 50, Pigment Green 17, Pigment Black 11, Pigment Black 33 and Pigment White 6 were used. Preference is also often given to using mixtures of inorganic pigments. Mixtures of organic and inorganic pigments are also commonly used.

Examples

In the following examples, percentages are by weight unless otherwise specified.

example 1

35 parts Cl. Pigment Black 7 (component A)

10 parts wetting and dispersing agent (component B)

9.5 parts of polyethylene glycol having an average molecular weight of

400 g / mol and a VOC content of 0.5% (component C)

0.2 parts of preservative (component D) 0.5 part of defoamer (component E)

44.8 parts of deionized water (component F)

In a grinding container, components (B), (C), (D), (E) and (F) were charged and mixed. Subsequently, the powdery component (A) was added and predispersed with the dissolver. The fine dispersion was carried out in a bead mill using Zirkonmischoxidperlen the size d = 1 mm with cooling. Subsequently, the grinding media were separated and the pigment preparation was isolated. The pigment preparation was stored at 60 ^° C. for one week and visually assessed. The viscosity of the pigment preparation was measured using a Brookfield Digital Viscometer Model DV-II at 100 revolutions per minute with spindle 4.

The pigment preparation was liquid, homogeneous and foam-free after one week of storage at 6O ⁰ C. The viscosity of the pigment preparation was 240 mPa.s.

Example 2

40 parts Cl. Pigment Red 146 (component A)

5 parts wetting and dispersing agent (component B)

20 parts glycerol ethoxylate with 6 moles of ethylene oxide and a medium

Molecular weight of 350 g / mol and a VOC content of 2% (component C)

0.2 parts preservative (component D)

0.5 parts defoamer (component E)

34.3 parts of deionized water (component F)

The pigment preparation is prepared and tested as described in Example 1. After one week storage at 60 ⁰ C, the pigment preparation was liquid, homogeneous and foam-free. The viscosity of the pigment preparation was 310 rnPa-s.

Example 3

35 parts Cl. Pigment Yellow 83 (component A)

6 parts wetting and dispersing agent I (component B)

4 parts wetting and dispersing agent II (component B)

7 parts of polyethylene glycol having an average molecular weight of 400 g / mol and a VOC content of 0.5% (component C)

0.2 parts preservative (component D)

0.5 parts defoamer (component E) 47.3 parts of deionized water (component F)

The pigment preparation is prepared and tested as described in Example 1. After one week storage at 60 ⁰ C, the pigment preparation was liquid, homogeneous and foam-free. The viscosity of the pigment preparation was 260 mPa-s.

Example 4

50 parts Cl. Pigment Yellow 74 (component A) 10 parts of wetting and dispersing agent (component B) 10 parts of polyethylene glycol monomethyl ether having a mean

Molecular weight of 500 g / mol and a VOC content of 0.5% (component C) 0.2 part of preservative (component D) 0.5 part of defoamer ( ^® component E) 29.3 parts of demineralized water (component F)

The pigment preparation is prepared and tested as described in Example 1. After one week of storage at 6O ⁰ C, the pigment preparation was liquid, homogeneous and foam-free. The viscosity of the pigment preparation was 600 mPa.s.

Example 5

40 parts Cl. Pigment Orange 43 (component A)

8 parts wetting and dispersing agent (component B)

2 parts wetting agent (component B)

9.5 parts of polyethylene glycol having an average molecular weight of 400 g / mol and a VOC content of 0.5% (component C)

0.2 parts preservative (component D)

0.5 parts defoamer (component E)

29.3 parts of deionized water (component F) The pigment preparation is prepared and tested as described in Example 1. After one week storage at 60 ⁰ C, the pigment preparation was liquid, homogeneous and foam-free. The viscosity of the pigment preparation was 200 mPa-s.

Example 6

30 parts Cl. Pigment Violet 23 (component A)

5 parts wetting and dispersing agent (component B) 9.5 parts of polyethylene glycol having an average molecular weight of

400 g / mol and a VOC content of 0.5% (component C)

0.2 parts preservative (component D)

0.5 parts defoamer (component E)

54.8 parts of deionized water (component F)

The pigment preparation is prepared and tested as described in Example 1. After one week storage at 60 ⁰ C, the pigment preparation was liquid, homogeneous and foam-free. The viscosity of the pigment preparation was

105 mPa s.

Example 7

30 parts Cl. Pigment Red 122 (component A)

6 parts wetting and dispersing agent (component B) 9.5 parts of polyethylene glycol having an average molecular weight of

400 g / mol and a VOC content of 0.5% (component C)

0.2 parts preservative (component D)

0.5 parts defoamer (component E)

53.8 parts of deionized water (component F)

The pigment preparation is prepared and tested as described in Example 1. After one week storage at 60 ⁰ C was the pigment preparation liquid, homogeneous and foam-free. The viscosity of the pigment preparation was 95 mPa.s.

Example 8 40 parts Cl. Pigment Blue 15: 1 (component A)

10 parts wetting and dispersing agent (component B)

10 parts of polyethylene glycol having an average molecular weight of

400 g / mol and a VOC content of 0.5% (component C)

0.2 parts of preservative (component D) 0.5 part of defoamer (component E)

39.3 parts of deionized water (component F)

The pigment preparation is prepared and tested as described in Example 1. After one week of storage at 6O ⁰ C, the pigment preparation was liquid, homogeneous and foam-free. The viscosity of the pigment preparation was 260 mPa-s.

Example 9

40 parts Cl. Pigment Green 7 (component A)

8 parts wetting and dispersing agent (component B)

9.5 parts of polyethylene glycol having an average molecular weight of

400 g / mol and a VOC content of 0.5% (component C)

0.2 parts of preservative (component D) 0.5 part of defoamer (component E)

41, 8 parts demineralized water (component F)

The pigment preparation is prepared and tested as described in Example 1. After one week storage at 60 ⁰ C, the pigment preparation was liquid, homogeneous and foam-free. The viscosity of the pigment preparation was 70 mPa-s.

Claims

claims:

1. Aqueous pigment preparations containing in addition to a coloring inorganic or organic pigment 0.1 to 20 wt .-% of a humectant with a determined according to DIN EN ISO 11890-2 VOC content of at most 5 wt .-%, wherein the humectant at least one Polyalkylene glycol obtained by addition of 1 to 500 moles of C ₂ to C ₄ alkylene oxide having a water content of less than 1 wt .-%, to a starting alcohol having 1 to 6 carbon atoms and 1 to 6 hydroxyl groups, which has a water content of less than 1% by weight can be obtained.

2. Aqueous pigment preparations according to claim 1, containing 5 to 15 wt .-% of the humectant.

3. Aqueous pigment preparations according to claim 1 and / or 2, wherein the humectant has a VOC content below 0.5 wt .-%.

4. Aqueous pigment preparations according to one or more of claims 1 to 3, wherein the polyalkylene glycol by addition of 1 to 500 moles of C ₂ - to C ₄ alkylene oxides having a water content of less than 100 ppm of a

Starting alcohol having 1 to 6 carbon atoms and 1 to 6 hydroxyl groups, which has a water content of less than 1 wt .-%, was prepared.

5. Aqueous pigment preparations according to one or more of claims 1 to 4, wherein the water content of the starting alcohols is below 0.1 wt .-%.

6. Aqueous pigment preparations according to one or more of claims 1 to 5, wherein the polyalkylene glycol is prepared using an alkoxylation catalyst, which alkali and / or alkaline earth hydroxides, especially sodium hydroxide, potassium hydroxide and

Calcium hydroxide which are dried after the reaction with the starting alcohol.

7. Aqueous pigment preparations according to one or more of claims 1 to 6, wherein the polyalkylene glycol was prepared in such a way that the alkoxylation catalyst for terminating the alkoxylation with an acid selected from acetic acid, propionic acid, lactic acid, citric acid, isooctanoic acid, isononanoic acid, isodecanoic acid, Lauric acid, myristic acid, hexadecanoic acid, octadecanoic acid, octadecenoic acid, boric acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphorous acid, hypophosphorous acid and hydrochloric acid.

8. Aqueous pigment preparations according to one or more of claims 1 to 7, wherein the starting alcohol of monoethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, glycerol, pentaerythritol, methanol, ethanol, propanol, butanol and pentanol is selected.

9. Aqueous pigment preparations according to one or more of claims 1 to 8, wherein the humectant further hydrotropic substances selected from formamide, urea, tetramethylurea, ε-caprolactam, methyl cellosolve, glycerol, N-methylpyrrolidone, 1, 3-diethyl-2-imidazolidinone, Thiodiglycol, sodium benzenesulfonate, sodium xylenesulfonate, sodium toluenesulfonate, sodium cumene sulfonate, sodium dodecylsulfonate, sodium benzoate, sodium salicylate or sodium butylmonoglycol sulfate.

10. Aqueous pigment preparations according to one or more of claims 1 to 9, wherein the polyalkylene glycol is prepared by addition of 3 to 80 and at least one C ₂ - to C ₄ alkylene oxide to the starting alcohol.

11. Use of at least one polyalkylene glycol which can be obtained by addition of 1 to 500 mol of C ₂ - to C ₄ -alkylene oxides to a starting alcohol having 1 to 6 carbon atoms and 1 to 6 hydroxyl groups, as a humectant with a according to DIN EN ISO 11890 -2 determined VOC content of at most 5 wt .-% for preparations of inorganic or organic pigments.

12. paints and inks, in particular aqueous emulsion paints, containing 0.1 to 20 wt .-% of an aqueous pigment preparation according to one or more of claims 1 to 9, based on the color.