DE202017104645U1 - Titanium dioxide-reduced composite and titanium dioxide-reduced emulsion paint - Google Patents

Abstract

Calcium carbonate-containing composite containing precipitated calcium carbonate PCC in an amount of 30-50% by weight, calcium hydroxide pigment particles in an amount of 30-50% by weight, water glass in an amount of 10-40% by weight. %, Titanium dioxide and / or a pigment substance from the group of the oxides ZnO, ZrO2, SnO2, or a mixture thereof in an amount of 0.1-7 wt .-% total.

Description

The invention relates to calcium carbonate-containing composite having a high degree of coverage and a high wet abrasion resistance for coating materials, aqueous coating materials and coating systems for walls and ceilings indoors, their preparation and their use in coatings and a wall and ceiling paint containing such a calcium carbonate -containing composite according to the preamble of claim 1 and according to claims 5, 18.

White wall paint or tinted wall paint is usually emulsion paint. It consists of water, pigments, additives, binders and fillers. The water evaporates without residue after application.

From the European patent EP 1 297 079 B1 a preservative-free dispersion paint is known, which consists of parts of a polymer dispersion, a pigment substance and / or filler and of water glass. From a material point of view, pigments of titanium dioxide, iron oxide, chromium oxide, etc. are preferred.

The German patent application DE 10 2014 013 455 A1 describes a preservative-free emulsion paint on a siliconate basis, wherein as a candidate pigment also titanium dioxide is highlighted.

Highly opaque emulsion paints and brilliantly colored architectural coatings are significantly achieved by the white pigment titanium dioxide (TiO ₂ ). Titanium dioxide is a white inorganic, mineral solid. The fine white powder is extracted from ores and mineral sands. For the painting and varnishing trade, the white pigment titanium dioxide is of essential importance. Coatings with decorative and protective functions have considerable titanium dioxide pigments.

Producers of colors advertise for a high white effect in many cases with the addition of a high, sometimes (extremely) very high, TiO ₂ content, without specifying this statement, however, in wt .-%.

By doing Textbook by Bodo Müller / Ulrich Poth, paint formulation and paint formulation: the textbook for training and practice, 2nd edition 2005, Vincentz Verlag, is on page 180 a ratio of titania to fillers of 10% to 90% for internal dispersion paints and 40% to 60% for high quality exterior emulsion paints.

By doing Textbook by Detlef Gysau, Füllstoffe, 2014, Vincentz Verlag is on p. 157 a calculation example of a simplified model formulation with a total solids content of 57.6% by weight, of which 8.0% by weight of binder, 8.0% by weight of titanium dioxide, 41.0% by weight of fillers and 0, 6% by weight of additives.

Due to the high scattering power of the light on crystals, titanium dioxide has the highest opacity of all white pigments and is therefore indispensable for the production of white paint, but also for covering colored lacquers.

For practical use there is no other white pigment with nearly comparable properties and high chemical stability, which can be used universally in coating materials.

Due to its high refractive index, titanium dioxide pigment has replaced Lithopone, a precipitation product consisting of zinc sulfide and barium sulfate, as the standard white pigment.

Titanium dioxide exists in three chemical modifications with different crystal structures and physical properties. These are Rutil, Anatas and Brookit. Rutile is the most thermodynamically stable form, with the result that anatase and brookite rearrange monotropically to rutile at higher temperatures. The rutile and anatase crystal system is tetragonal while it is orthorhombic for brookite.

Due to the lack of absorption in the visible spectral range between 380 nm and 700 nm, the high refractive index of titanium dioxide leads to extensive use for such coatings and coating systems.

In the literature, rutile is assigned a refractive index of about 2.75 and anatase a refractive index of about 2.55 over the entire spectral range. The high refractive index is achieved by means of a pronounced polarizability reaches the bonding electrons in the crystal lattice, which are attributable to the ionic crystal primarily the oxygen atoms.

Decisive for the suitability of a substance as pigment is the refractive index. The optical effect of white pigments is based on their very low light absorption and their strong non-selective light scattering. Such white pigments can be classified into oxides, which include TiO ₂ , ZnO, ZrO ₂ , SnO ₂ , in carbonates (2PbCO ₃ , Pb (OH) ₂ , 2ZnCO ₃ , 3Zn (OH) ₂ ) and in sulfates (2PBSO ₂ , Pb (OH) ₂ ) as well as in sulfides (ZnS, ZnS + BaSO ₄ ).

However, the refractive index of these substances outside of titanium dioxide is sometimes considerably lower. Thus, for calcium carbonate, a refractive index n _o of 1.48 to 1.65, for mica 1.58 to 1.61, for barium sulfate 1.64, for lithopones 1.84 to 2.08, for zinc oxide 2.01 to 2 , 09, for zinc sulfite 2.37 and for organic binders in the range of 1.40 to 1.70.

For this reason, titanium dioxide pigments are by far the most frequently used for such coating systems, in particular paints. The white pigments mentioned above are reserved for special operations only.

The higher the proportion of titanium dioxide pigments, the higher the degree of whiteness and luminosity and, consequently, the hiding power. In the present case, a pigment is understood as meaning a substance which is used as colorant. Binders, additives and fillers perform additional functions that are responsible, among other things, for the processing and the quality of the paint.

Additives contribute to the fact that the various ingredients for such a coating system, eg. As a color, mix well and guarantee its stability. They also have an influence on the drying capacity of the coating after its application.

Binders help to ensure that the coating, especially the paint, adheres to the wall, that no cracks or blisters are formed, and that the paint does not peel off or fade. Binders are also of great importance for surface cleaning.

Fillers affect the consistency of such a coating and give volume to the paint.

In the case of very cheap paints, instead of the aforementioned pigments, inorganic substances are frequently added, but these do not lead to a film-forming coating system because the air entrapment after application is very great.

This effect is essentially based on the fact that in such color formulations is usually carried out above the critical pigment volume concentration (KPVK), that is, the pigment and Füllstoffoberflächen are not fully occupied by the surrounding paint system. In addition to the interface between pigment and binder, there are also interfaces between pigment and air above the KPVK. In contrast, the difference in refractive indices of titanium dioxide and the binder matrix is high enough to produce scattering responsible for the white appearance. The refractive index of typical fillers is lower, so these substances appear to be transparent when fully enveloped. The difference between the refractive indices of typical fillers and that of air (n = 1) is significantly larger, so that the fillers are only perceived as superficially white.

In particular, such colors do not meet the requirements of standards such. B. the DIN EN 13300 , are placed on such coating systems, with a view to the criteria of the contrast ratio (hiding power), gloss, maximum grain size and wet abrasion resistance.

Looking towards the DIN EN 13300 It should be mentioned that this standard colors, z. As emulsion paints, based on the criteria "application, binder type, gloss, maximum grain size, contrast ratio (hiding power), wet abrasion resistance" characterized. How these criteria are achieved, measured or determined is not deduced from the example DIN EN 13300 but often results from other German or European standards, which by reference in the DIN EN 13300 are involved. So the contrast ratio is after DIN EN ISO 6504-3 while the cleanability and abrasion resistance after the DIN EN ISO 11998 be measured, ie only the introduction to the classes is carried out according to DIN EN 13300 ,

Insofar as such standards are explicitly referred to in the context of the disclosure of this invention, in fact only these standards are addressed, and therefore not about American, African, Asian or Australian standards. The references to the standards are made in the version valid at the time of application.

Due to the relatively high cost of TiO ₂ , it has long been attempted to substitute some of them with industrial mineral fillers such as calcite or calcined kaolin, and to develop organic pigments and fillers and to use them in combination with the mineral materials.

A disadvantage has repeatedly been found that the lower refractive index of inorganic substances of the substitution sets significant limits. Almost complete or even complete substitution of titanium dioxide has not yet been achieved, even if the properties associated with it are nevertheless to be achieved.

It is known to bring about a saving by the combination of titanium dioxide particles with suitable fillers, which are to act as so-called extender particles as spacers for the TiO ₂ particles. Crystallized fillers include so-called precipitated calcium carbonate (PCC), which is also referred to as precipitated calcium carbonate. It is an inorganic filler, the z. B. is made by precipitation of milk of lime. A possible manufacturing method is, for example, in the German patent application DE 10 2007 023 093 A1 described.

In an effort to provide an alternative composite pigment which has high weathering resistance and chemical resistance and is said to achieve at least a similar hiding power compared to pure titanium dioxide, the International Patent Application discloses WO 2015/086146 A1 a calcium phosphate-containing composite pigment comprising titanium dioxide pigment particles and precipitated particulate crystalline calcium phosphate in a specific particle size. Also in this respect, the retained proportion of titanium dioxide but contains a weight fraction of up to 90%, wherein in the comparative example, a titanium dioxide pigment was selected with a weight fraction of 45%. With regard to the results obtained, however, it must also be stated in this patent application that there are limits to the partial replacement of titanium dioxide because, in any case, small losses of the optical properties can be the result. This undesirable result can be attributed to the fact that the hiding power of precipitated calcium carbonate is significantly lower at a refractive index in the range from 1.48 to 1.65, as stated above, than in the case of a white pigment of the substance group of the oxides. For a decisive factor, of which the hiding power of a pigment dispersion depends predominantly, is the refractive index of the pigment; the bigger it is, the better the hiding power.

In addition to the aspects of the cost of titanium dioxide, another aspect is now coming into the limelight. For at the level of the European Union, the harmonized classification of titanium dioxide with a view to carcinogenic effects, at least in a risk assessment, eg. For example, a workplace dust explosion, which is considered to justify the intrinsic hazard of a substance, is discussed.

Based on the above aspects, therefore, the present invention raises the problem, a calcium carbonate-containing composite and such a calcium carbonate-containing composite-containing coating system for walls and ceilings, especially a color to develop, not least all the requirements the qualitative classification of wall and ceiling colors of European standard EN 13300 fulfilled, but can be dispensed with the use of the white pigment titanium dioxide TiO ₂ to a greater extent than previously known.

In addition, such a composite and provided with such a composite coating system should be inexpensive to produce. Furthermore, it should be as user-friendly as conventional coating systems prepared with titanium dioxide, in particular paints.

These aspects are solved with a titanium dioxide-reduced composite according to claim 1 and a titanium dioxide-reduced coating system according to claim 5 and with a use according to claim 18.

The invention relates to a calcium carbonate-containing composite containing precipitated calcium carbonate PCC in an amount of 17-37 wt .-%, calcium hydroxide pigment particles in an amount of 17-37 wt .-% and water glass in an amount of 5-19 wt .-% and titanium dioxide and / or a pigment substance from the group of oxides ZnO, ZrO ₂ , SnO ₂ , or a mixture thereof in a total amount of 0.1 wt .-% - 60 wt .-%.

The proportion of precipitated calcium carbonate PCC of 22-32% by weight and very particularly preferably 25-29% by weight and of calcium hydroxide pigment particles of 22-32% by weight and very particularly preferably 25% is preferred. 29 wt .-% and of water glass of 7-17 wt .-% and most preferably from 9-15 wt .-%. With respect to titanium dioxide and / or the group of oxides ZnO, ZrO ₂ , SnO ₂ , an amount of 10-50% by weight, and more preferably an amount of 25-45% by weight, is preferred.

If a standard formulation of about 27% by weight of precipitated calcium carbonate PCC and about 27% by weight of calcium hydroxide pigment particles and of about 12% by weight of water glass and about 35% by weight of titanium dioxide is chosen, then a suitable formulation is obtained Standard composite according to the invention.

Furthermore, the invention relates to a titanium dioxide-reduced emulsion paint containing 3-15 wt .-% polymer dispersion calculated as solids content, 10-60 wt .-% filler, 1-4 wt .-% water glass, 2-15 wt. % Calcium silicate hydroxide mineral, 2-15% by weight of precipitated calcium carbonate PCC, 1-10% by weight of titanium dioxide, calculated in each case as solids content and to 100% by weight of added amounts of water.

With respect to a coating system, it is particularly preferred to use about 3-7% by weight and more preferably 4-6% by weight of precipitated calcium carbonate PCC, about 3-7% by weight and most preferably 4-6% by weight. Calcium hydroxide pigment particles and about 1-2 wt .-% and particularly preferably 1.5 wt .-% water glass and preferably 2-8 wt .-% titanium dioxide and particularly preferably 3-7 wt .-% titanium dioxide provided.

All information disclosed in the context of this invention in terms of size, concentration in wt .-%, pH, etc., are described with the proviso that they include all values that are within the range known to those skilled in each measurement accuracy.

For the purposes of the present invention, an emulsion paint is understood as meaning water-containing coating materials and coating systems for walls and ceilings which comprise a dispersion, as a rule an emulsion or (or) suspension, of fillers, binders and solvents, pigments and additives. It may be - without, however, be limited thereto - to a plastic dispersion paint, are added to the preservatives. It can also be a pure emulsion paint formulated without preservatives. In particular, these include aqueous coating materials and coating systems for walls and ceilings in the sense of DIN EN 13300 as well as the DIN EN 1062 understood, but without being limited to this classification.

By means of the titanium dioxide-reduced composite according to the invention and by means of the titanium dioxide-reduced color according to the invention, a hiding power is achieved which comprises at least the Class 2 of DIN EN 13300 met, so a hiding power (contrast ratio) of> 98- <99.5 at 8 m ² per liter.

With a color according to the invention, a hiding power of between 99 and 98 at 8 m ² per liter is preferred DIN EN 6503-4 reached.

For explanation, it is pointed out that the contrast ratio after the DIN EN 1300 / DIN EN ISO 6503-4 is determined by plotting the materials on a black and white test surface, using the average consumption as the basis; then it is measured how the coverage of the black test area is compared to the white test area (contrast ratio in%).

Furthermore, a wet abrasion resistance of at least Class 3 according to DIN EN 13300 / DIN EN ISO 11998 achieved, ie ≥ 20 microns and <70 microns at 200 strokes. Under wet abrasion resistance while the cleaning ability, namely the washing or abrasion resistance and the measure of the resistance to mechanical abrasion, z. B. when cleaning the surface, understood.

With regard to the wet abrasion resistance, it is preferable that Class 2 of DIN EN 13300 achieved, namely ≥ 5 microns and <20 microns at 200 strokes.

To determine the wet abrasion resistance is after the DIN EN 1300 / DIN EN ISO 11998 measured in a standardized test method, the coating thickness decrease of the coating film; In this case, the layer thickness loss of the color in μm is determined with a scrubbing fleece taking into account different stresses (scouring strokes).

It has surprisingly been found that the composite according to the invention of 10-40% by weight of water glass, 30-50% by weight of calcium silicate hydroxide mineral and 30-50% by weight of precipitated calcium carbonate substitute titanium dioxide to an even greater extent than heretofore can, to a range of application of 7 wt .-% - 0.1 wt .-%, preferably 6 wt .-% - 0.1 wt .-%, particularly preferably 5 wt .-% - 0.1 wt. %, and more preferably 4 wt .-% - 0.1 wt .-% titanium dioxide on the overall formulation, while still achieving a hiding power of aqueous coating materials and coating systems for walls and ceilings, at least the aforementioned classes of DIN EN 13300 correspond and which can be achieved without the use of the claimed composite only with titanium dioxide. The same applies to the aforementioned class of wet abrasion resistance after the DIN EN 13300 ,

These properties comparable with the titanium dioxide in their composition of composition of the present composite are surprising because the components of the precipitated calcium carbonate and of the calcium silicate hydroxide mineral in each case have a refractive index which is significantly lower than that for titanium dioxide above was mentioned. The refractive index for precipitated calcium carbonate is about 1.6 and the refractive index for the calcium silicate-hydroxide mineral is about 1.58. Accordingly, the addition of the individual abovementioned constituents to the white pigment titanium dioxide known in the prior art has never led to a significant improvement in the hiding power of an aqueous coating material or coating system, in particular a paint, produced herewith. The physical / chemical reasons why this surprising combinatorial effect of the composite occurs can only be assumed at the present time.

In accordance with the above explanations, a reduction to the specified ranges of 7% by weight - 0.1% by weight, or 6% by weight - 0.1% by weight, or 5% by weight -0.1 wt .-%, or 4 wt .-% - 0.1 wt .-% of a pigment substance from the group of the oxides ZnO, ZrO ₂ , SnO ₂ or a mixture thereof or a mixture with titanium dioxide.

The present composite or the water-containing coating material or the coating system for walls and ceilings produced with its addition achieves the good hiding power therefore not the high refractive index, as is the case with titanium dioxide, but the combination of the three components together with one only a minor proportion of titanium dioxide. The result in a coating system is a masking film capable of completely masking high-contrast backgrounds even in thin layers.

According to the invention, the smallest fraction of titanium dioxide is also a proportion by weight of more than 1% by weight to 7% by weight, which is therefore greater than a proportion of 0.1% by weight. The same applies to a proportion of oxides used ZnO, ZrO ₂ , SnO ₂ .

Already with a relatively low pigment volume concentration is thus a hiding power for water-based coating systems, in particular colors achieved, which corresponds to that of aqueous coating materials and coating systems, which - as before - titanium dioxide as a white pigment in an amount of at least 8 wt. -% and sometimes significantly more was added.

The high hiding power achieved with the composite according to the invention is therefore also surprising because the individual components of the composite were used in the prior art rather as fillers which in this property were admixed to the titanium dioxide only as singular components but never in the composition according to the invention. Surprisingly, the result is also because each of the three components individually, even taken in quite a large amount by itself, only leads to a semi-opaque glaze, if they were used as a contrast-establishing medium and considered as such.

For the purposes of the present invention, water glass means inorganic binders, ie water-soluble silicates or their aqueous solutions. Sodium silicates, potassium silicates or lithium silicates may be considered. Preference is given to a silicate in which predominantly potassium is contained, thus potassium silicate glass.

Particular preference is given here to a potassium silicate solution having a solids content of about 20 to 35% by weight, particularly preferably 25 to 30% by weight. This potassium silicate-based binder further has a density, measured at 20 ° C, of about 1.20-1.30 g / cm ³ . The 10% pH is 10.5-11.0. The viscosity at 20 ° C is about 25-30 mPas.

The constituent of 1-5% by weight of water glass according to the invention thus relates to the percentage solids content of this inorganic binder.

Of course, the water glass in the context of the invention also fulfills its conventional functions in connection with the production of water-containing coating materials, in particular as regards its property for improving the storage stability and the preservation as well as the processability.

As a pigment, the composite 30-50 wt .-% of a calcium silicate hydroxide mineral on. It is an inorganic, extremely white filler that provides high opacity, which in particular provides high coverage.

For the purposes of the invention is understood as a calcium silicate hydroxide mineral, a chemical composition with the constituents 6CaO 6SiO ₂ H ₂ O. In addition to the main constituents CaO and SiO ₂ , further secondary constituents such as magnesium oxide, aluminum oxide or traces of other elements may be present.

It has a refractive index of about 1.58-1.59. Its pH after DIN ISO 787/9 is about 11.

The calcium silicate-hydroxide mineral may be provided as a powder or as a slurry.

Further, the composite has 30-50% by weight of precipitated calcium carbonate. It can be present in different crystal modifications and grain shapes. Commercially available precipitated calcium carbonate can be used for this purpose, the preparation of which begins with the degradation of the limestone and comprises the further process steps of firing and extinguishing the lime, precipitation of the lime, for example by reaction of the calcium hydroxide with the CO ₂ originating from the lime burner. The morphology of the precipitated calcium carbonate, whose molecular formula is CaCO ₃ , has a solid state of matter.

It can be present as a powder or as a slurry.

The particle size, in particular the particle size distribution, has an effect on the light scattering efficiency. The finer a powder, the more it normally spreads, because it has a larger specific surface area. A role continues to play the purity. The refractive index is about 1.65. The crystal structure of the calcite is rhombohedral.

As far as titanium dioxide is added, it may be commercial titanium dioxide as used for the production of emulsion paints.

A water-containing coating material and coating systems for walls and ceilings, in particular a color, in addition to the aforementioned components also have other minor components, namely kaolin present as Kaolinitaluminiumsilikathydrat with a molecular formula Al ₂ O ₃ 2SiO ₂ 2H ₂ O. Instead kaolin or in addition to kaolin can as Addition of talc are added, namely magnesium silicate with water of crystallization (Mg ₃ [(OH) ₂ / SiO ₄ O ₁₀ ]). Kaolin and talc may be 25-35% by weight.

It is particularly preferred if the paint has more than 1.5% by weight of water glass and 5% by weight of monoclinic calcium silicate hydroxide mineral. Here, calcium silicate-hydroxide mineral is preferred in the morphology of xonotlite.

The paint contains the composite according to the invention in an ideally dispersed form, which leads to an increase in the light scattering of the titanium dioxide-replacing components in the user system.

It is preferable that the color has a pH of 10-12 after DIN ISO 787/9 having.

It is furthermore preferred that the color is preservative-free, which is achieved by adjusting the pH range of 10-12. The adjustment of the pH is primarily by the water glass, which - as stated - as a component of the composite also contributes to the effect of the high hiding power of the composite. Furthermore, the pH can be adjusted by means of a siliconate.

Preference is given to alkali metal or alkaline earth metal alkyl silicates which are used in particular for fine adjustment of the pH between 11 (potency limit) and 11.5 (labeling limit).

The color may of course also contain other additives such as dispersants, thickeners, stabilizers, defoamers and / or water repellents.

The above-mentioned polymer dispersion contained in the color as a solid content in the formulation is preferably selected from polymers obtained from conventional monomers. In particular, polymers in the embodiment are detected as pure acrylates, styrene acrylates up to vinyl acetate ethylene.

The use of mixed polymers consisting of different monomers is possible.

In particular, silicates, carbonates, fluorspar, sulfates and oxides are added as fillers.

The invention will be further described by the following exemplary composition. All information is given in wt .-%. With this information, no limitation of the invention is connected. component Wt .-% water 30-35 Thickener, z. B. cellulose ethers 0.05-0.30 Wetting agent, e.g. B. polyphosphonate 0.05-0.30 Stabilizing agent, e.g. B. Solutions of quaternary ammonium compounds 0.50 to 1.50 defoamers 0.15-0.45 talc 3.0-7.0 Titanium dioxide 0.1-7.0 calcite 8.50 to 35 Precipitated calcium carbonate 2-15 Calcium silicate hydroxide mineral 2-15 Binder dispersion, vinyl acetate ethylene based 5-15 potash water glass 1-5 Thickener, z. As polyurethane-based 1.0 to 2.75 total 100

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1297079 B1 [0003]
• DE 102014013455 A1 [0004]
• DE 102007023093 A1 [0029]
• WO 2015/086146 A1 [0030]

Cited non-patent literature

• Textbook by Bodo Müller / Ulrich Poth, Paint formulation and paint formulation: the textbook for training and practice, 2nd edition 2005, Vincentz Verlag, is on p. 180 [0007]
• Textbook by Detlef Gysau, Füllstoffe, 2014, Vincentz Verlag is on p. 157 [0008]
• DIN EN 13300 [0024]
• DIN EN 13300 [0025]
• DIN EN 13300 [0025]
• DIN EN 13300 [0025]
• DIN EN ISO 6504-3 [0025]
• DIN EN ISO 11998 [0025]
• DIN EN 13300 [0025]
• European standard EN 13300 [0032]
• DIN EN 13300 [0041]
• DIN EN 1062 [0041]
• Class 2 of DIN EN 13300 [0042]
• DIN EN 6503-4 [0043]
• DIN EN 1300 / DIN EN ISO 6503-4 [0044]
• Class 3 according to DIN EN 13300 / DIN EN ISO 11998 [0045]
• Class 2 of DIN EN 13300 [0046]
• DIN EN 1300 / DIN EN ISO 11998 [0047]
• DIN EN 13300 [0048]
• DIN EN 13300 [0048]
• DIN ISO 787/9 [0061]
• DIN ISO 787/9 [0070]

Claims (19)

Calcium carbonate-containing composite containing precipitated calcium carbonate PCC in an amount of 30-50% by weight, calcium hydroxide pigment particles in an amount of 30-50% by weight, water glass in an amount of 10-40% by weight. %, Titanium dioxide and / or a pigment substance from the group of the oxides ZnO, ZrO ₂ , SnO ₂ , or a mixture thereof in an amount of 0.1-7 wt .-% total. A calcium carbonate-containing composite according to claim 1, characterized in that the water glass is potassium silicate in a solution having a solids content of 15.0% -30%. A calcium carbonate-containing composite according to claim 1 or 2, characterized in that the precipitated calcium carbonate has a calcined rhombohedral crystal structure and a pseudo-cubic crystal formation. Calcium carbonate-containing composite according to one or more of the preceding claims, characterized in that the calcium hydroxide pigment has a monoclinic mineralogical composition. Emulsion paint containing 3-15% by weight of polymer dispersion, 10-50% by weight of filler, 1-5% by weight of waterglass, 2-15% by weight of calcium silicate hydroxide mineral, 2-15% by weight of precipitated Calcium carbonate 0.1-7.0% by weight of titanium dioxide and / or a pigment substance from the group of the oxides ZnO, ZrO ₂ , SnO ₂ , or a mixture thereof, all the abovementioned components calculated as solids content, and to 100% by weight supplemented amounts of water. Emulsion paint according to claim 5, characterized in that the water glass is a potassium silicate solution having a solids content of 25.0% -30%. Emulsion paint according to claim 5 or 6, characterized in that the calcium silicate hydroxide mineral is present in monoclinic mineralogical composition. Emulsion paint according to one or more of the preceding claims 5 to 7, characterized in that the precipitated calcium carbonate is present in a calcined rhombohedral crystal structure and a pseudo-cubic crystal form. Emulsion paint according to one or more of the preceding claims 5 to 8, characterized in that it has a hiding power of at least 98 to <99.5 at 8 m ² per liter according to DIN EN ISO 6504-3 and a wet abrasion resistance of at least ≥ 20 microns and < 70 μm at 200 strokes according to DIN EN ISO 11998. Emulsion paint according to one or more of the preceding claims 5 to 9, characterized in that the dispersion paint contains 1.5 wt .-% water glass, 5 wt .-% monoclinic calcium silicate hydroxide mineral. Emulsion paint according to one or more of the preceding claims 5 to 10, characterized in that the pH is adjusted to 10-12 according to DIN ISO 787/9. Emulsion paint according to one or more of the preceding claims 5 to 11, characterized in that the color is preservative-free. Emulsion paint according to one or more of the preceding claims 5 to 12, characterized in that the pH is adjusted by means of a siliconate. Emulsion paint according to one or more of the preceding claims 5 to 13, characterized in that it contains as further additives dispersants, thickeners, stabilizers, defoamers and / or water repellents. Emulsion paint according to one or more of the preceding claims 5 to 14, characterized in that the polymer dispersion is selected from polymers consisting of the monomers carboxylic acid vinyl ester having 3-10 carbon atoms, N-vinylpyrollidone, ethylenically unsaturated carboxylic acids, their esters, their amides or whose anhydrides and / or their α-olefins, or from acrylic monomers and styrene has been obtained. Emulsion paint according to claim 15, characterized in that the polymer dispersion consists of mixtures of the aforementioned components. Emulsion paint according to one or more of the preceding claims 5 to 16, characterized in that the fillers are selected from silicates, carbonates, fluorspar, sulfates and / or oxides. Use of the calcium carbonate-containing composite according to one or more of claims 1 to 4 for improving the light scattering efficiency in emulsion paints. Use of the emulsion paint according to one or more of the preceding claims 5 to 17 indoors or outdoors.