EP2209751A2

EP2209751A2 - Composition that forms, on mixing with water, a paste for producing a decorative coating on a support and tools used for this purpose

Info

Publication number: EP2209751A2
Application number: EP08844336A
Authority: EP
Inventors: Dominique Secret; Nicole Secret
Original assignee: ND Secret
Current assignee: RM DISTRIBUTION
Priority date: 2007-10-29
Filing date: 2008-10-27
Publication date: 2010-07-28
Also published as: WO2009056523A2; EP2597074A2; EP2597074A3; FR2922893A1; WO2009056523A3

Abstract

The invention relates to a concept for the decoration of a support, in particular of interior surfaces of a building, in which concept a dry composition, intended to be mixed with water, is used to more easily prepare a paste that can be applied to the support, with a view to producing a decorative coating having a “concrete feel”, a “concrete appearance”, a “concrete hardness”, and which can moreover be removed using a wallpaper steam stripper. To achieve this objective, the invention firstly relates to a dry pulverulent composition comprising, in weight percent on a dry basis: from 30 to 60 of cement, from 30 to 60 of filler, from 0.5 to 10 of at least one absorbent, from 0.01 to 1 of at least one fibrous flexibilizing agent, from 0.01 to 3 of at least one retarder, from 0.01 to 1 of wetting agent, from 0.1 to 20 of decorative particles, from 0.5 to 10 of at least one hardener, and from 0 to 1 of at least one colorant. The invention also relates to a method of preparing a paste by mixing this composition with water, and also to a method of obtaining a concrete decorative coating. The invention also relates to the tools used for this method, namely, in particular, a notched float for the application of the paste, a fan rake for creating a scratched effect, a nylon bristle brush for creating a brushed or combed effect, a two-blade structuring spatula for creating a striped or striated effect. The invention finally relates to a decorative coating kit for interior surfaces of a building comprising the aforementioned composition, at least one of the aforementioned tools, (optionally) a smoothing spatula and at least one of the following components or accessories, primer for basecoats, sponge for blending effect, specific colorant, product for white or coloured haze, protective varnish or wax.

Description

COMPOSITION MIXING WITH WATER A PASTE FOR CARRYING OUT A DECORATIVE COATING ON A SUPPORT AND

TOOLS USED TO THIS END

Field of the invention

The field of the invention is that of decorative coatings (preferably interior) intended to be applied to existing supports in buildings, more particularly on walls, walls or ceilings. More specifically, the invention relates to a concept of decorating supports, in particular interior surfaces of buildings, in which concept a dry composition is used to be mixed with water to easily prepare a paste applicable to the support , in order to achieve a decorative coating. Such a concept includes the method of producing the decorative coating and the tools, products, accessories and instructions for use in the implementation of the process of producing the decorative coating. Such a decorative coating must be accessible to everyone, that is to say, non-professionals. For that, the motto must be the simplicity of implementation. In addition, to be commercially attractive, such a decoration concept must be able to offer consumers an extremely wide range of decorative variants.

Technological background and technical problem

By way of illustration of the interior decoration concepts mentioned above, mention may be made of two patent documents and two commercial developments, of which the inventors of the present application are at the origin. The French patent application N ⁰ 2719314 discloses a dry composition to be mixed with a liquid such as water in view of its application on a support (building elements) to form a coating of said support. This dry composition contains mineral or pseudo-mineral particles such as crushed shells, artificial hydrophobic fibers and cellulose fragments, or even possibly soluble powder glue in the mixing liquid. The decorative coating that is to be obtained from this composition is a coating having a granular appearance, reminiscent of the surface of minerals, which is why the composition essentially comprises mineral particles combined with a substrate consisting of fibers and cellulose fragments, said substrate ensuring the cohesion of the assembly both during the application on the support and for the coating applied on said support.

About 6 parts by weight of mineral particles are provided for one part by weight of fibers and cellulose fragments. Water-soluble powdered glue is added to because of 8% by weight. After mixing three parts by weight of dry composition to 5 parts by weight of water, a homogeneous paste is obtained which can be applied to the support very easily because it spreads very well with the spatula, the trowel, or still by trowel, forming a continuous layer which is easy to work and which does not dissociate in particular thanks to the adhesive which adheres to the support and the fibers which give cohesion to the mineral particles. After drying, the resulting coating has a desired mineral appearance, the fibers being virtually invisible to the naked eye. This composition and the coating obtained therefrom may comprise various additives such as dyes, especially in particulate form, as well as rigid beads useful as calibration elements of the pulp spread with a spatula. These particulate additives may be flakes, mica pellets, gold particles or even long colored threads.

The application FR No. 2,719,314 also teaches a process for preparing a paste by mixing the dry composition with water. The method of applying this paste on a support to form a coating is also part of the teaching of this French patent application.

On the commercial side, this demand corresponds more or less to the commercial decorative concept called "Mur d'autrefois®".

European patent EP ⁰ N 1,099,675 discloses a coating and a wall surface decoration process by applying said coating. This coating comprises an inner coating layer intended to be applied on the surface (regular or not) and which consists of a first water paste comprising absorbent elements capable of absorbing water and an outer coating layer which is applied to said inner coating layer, after drying of the latter, and which consists of a second water-based paste, said absorbent elements comprising in combination particles of cellulose and vermiculite. This coating is designed to overcome the initial step of waterproofing the surface to be coated. It includes only hydrophilic materials, harmless and odorless. The first water dough is based on calcium carbonate, fine vermiculite, synthetic resin powder, biocide, fibrous elements, cellulose particles and mineral fillers. After drying of this absorbent inner layer, there is applied thereto an outer coating layer based on the second water paste comprising calcium carbonate, titanium oxide, a cellulosic thickener, an acrylic resin , a biocide, a coalescing agent and a mineral filler.

A complementary layer of protection based on varnish or wax can be applied to at least one of the two internal and external coatings. It is envisaged in this patent EP No. 1,099,675, to give a non-uniform surface appearance to the coating: accentuation of reliefs, creation of decorative patterns by inlaying recessed patterns, use of adhesive tapes in vertical and horizontal lines for give a look tile, slab or brick, application of different colors. The finishing step of the process according to EP-BI 099 675 comprises an operation of smoothing / polishing the coating using a roller or a piece of marble. The decorative concept corresponding to this patent EP-B 099 675 is the commercial development referred to as "tadelakt® way". It is indeed a coating imitating the tadelakt or stone and presenting for the tadelakt a mirror effect, possibly with decoration motifs inlaid or imitating stone for the concept as the stone with, in both cases, multiple variants staining.

The technical problem underlying the present invention is to propose a new concept of decoration in the same spirit as the "old wall®" and "tadelakt® style" concepts mentioned above, but this time applied to the imitation of the raw concrete aspect as a coating for interior decoration, walls, walls or ceilings of buildings, among others.

The development of this decorative alternative has generated a number of incidental technical difficulties, including:

• => Difficulty to find a dry composition giving in mixture with the water a paste which can be of a foamy consistency, which does not stain, which allows a creamy application on the supports in thin thickness of 2 to 5 mm, and which, when it dries, gives a coating having a "concrete" feel, a "concrete" appearance, a "concrete" hardness, and which, moreover, is peelable at the wallpaper stripper.

¹ ^ Difficulty finding tools to allow the user to create structures emphasizing the different raw aspects that can be encountered for architectural concrete

(brushed, faded, lined or striated) to bring a decorative aspect.

Objectives of the invention

One of the essential objectives of the present invention is to propose a new concept of interior decoration imitation of the raw appearance of concrete, based on the provision of a dry composition, from which can be prepared by mixing with a liquid, preferably water, a paste for producing a decorative coating having the appearance of concrete on various supports such as interior surfaces of buildings.

Another essential object of the present invention is to provide a dry composition, from which can be prepared by mixing with a liquid, preferably water, a paste allowing the realization of a decorative coating having the appearance of concrete on various supports such as interior surfaces of buildings, this dry composition giving, in mixture with the water, a paste which can be of a foamy consistency, which does not stain, which allows a creamy application on the supports in fine thickness from 2 to 5 mm, and which, when it dries, gives a coating that has a touch "concrete", a "concrete" and a hardness "concrete", and that in addition is peelable to the wallpaper stripper.

Another essential object of the present invention is to provide a novel method of producing a decorative interior decorative coating imitating the raw appearance of concrete, based on the provision of a dry composition, from which can be prepared by mixing with a liquid, preferably water, a paste for producing a decorative coating having the appearance of concrete on various substrates such as surfaces (eg interior), buildings.

Another essential objective of the present invention is to provide tools adapted to the processes for producing a decorative coating as defined in the above objective, these tools enabling the user to create structures accentuating the various raw aspects. that can be encountered for architectural concrete (brushed, faded, lined or striated) to provide a decorative appearance.

Another essential objective of the present invention is to provide means and a method for producing an interior decorative coating imitating raw concrete, which are within the reach of a public of non-professionals, thanks to its simplicity of implementation. and that also offer multiple decorative variants leaving each user a part of creation to ultimately achieve personalized results and very successful in terms of aesthetics. Another essential objective of the present invention is to provide a new concept of interior decoration imitation of raw concrete that is economical.

Another essential objective of the present invention is to provide an interior decorative coating having the concrete appearance and which can be obtained by easy mixing of a dry composition with a liquid such as water, without particular know-how and forming , reproducibly, a homogeneous pasty mixture, suitable for being applied to the support. Another essential objective of the present invention is to provide an interior decorative coating, imitating the raw appearance of concrete, which can be applied to any type of support, whether the surface is regular or not.

Another essential objective of the present invention is to obtain an interior decorative coating having the appearance of raw concrete, which hangs perfectly on any support and which has a good behavior over time while being also removable at the using usual means for the takeoff of wallpapers (steam stripper). Brief description of the invention

These objectives, among others, are achieved by the invention, which concerns first and foremost a composition, preferably a dry composition, intended in particular to be mixed with water to prepare a paste that is applicable to a support such as an interior surface. for building a decorative coating, characterized in that it comprises (in% by weight on a dry basis):

• from 30 to 60 of cement,

• from 30 to 60 charge,

From 0.5 to 10 of at least one absorbent agent, from 0.01 to 1 of at least one flexible fibrous agent,

From 0.01 to 3 of at least one set retarder,

From 0.01 to 1 wetting agent,

From 0, 1 to 20 of decorative particles,

• from 0.5 to 10 of at least one hardener, • and from 0 to 1 of at least one dye.

According to another of its aspects, the present invention relates to a process for preparing a paste that can be applied to a support in order to produce a decorative coating imitating the appearance of raw concrete, this process being characterized in that it consists essentially in mixing a given amount of the composition, preferably dry, as defined above, with a given volume of water.

In another of its aspects, the invention relates to a method of producing a decorative coating imitating the raw concrete on a support by applying the paste prepared by the aforementioned method.

According to another of its aspects, the invention relates to a method of producing a decorative coating imitating the raw concrete on a support by application of the paste prepared as indicated in the process above and essentially consisting of: a- optionally to be prepared the support, with a specific underlayer; b- to apply, preferably using a notched trowel, at least one layer of paste on the support optionally coated with the underlayer obtained in -a-, c- to smooth the layer obtained in -b- by means of a smoothing spatula; d- optionally to achieve, with the aid of suitable tools, decorative patterns on the layer smoothed -c- and not yet hardened; e- optionally washing the smoothed-c- layer, cured and optionally decorated with patterns obtained in step -d-, passing a preferably wet sponge to produce shades effects (whiteness / coloration); optionally to apply a white or colored haze to the smoothed-c- layer, cured, and optionally decorated according to step -d- and / or -e-, so as to obtain other decorative shades, preferably a patina; optionally curing the layer smoothed at -c- and optionally decorated according to step -d- and / or -e- and / or -f-; h- optionally to be applied, preferably with a spalter or sponge, on the layer smoothed in (c), hardened and optionally decorated according to step (d) and / or (e) and / or (f), a wax or a protective varnish, able to make the coating washable and to give a waxed appearance to the finish.

According to another of its aspects, the invention relates to a coating obtained by the process as defined above and characterized in that it is peelable with means adapted for peeling off the wallpaper and using a spatula. In another of its aspects, the present invention provides tools for the implementation of the abovementioned methods, characterized in that these tools are selected from the group comprising:

• a notched trowel comprising a handle connected by a rod to a plate, at least a portion of the edges are serrated and toothed, the shape and dimensions of the teeth and notches being chosen so that the amount of paste deposited on the support using the trowel, to obtain in step -b- a layer adapted to the following steps;

• a comb for effect scratched with a handle extending by a triangular body recessed in its center, and a bundle of son whose base is subdivided into bundles; the base of said boot being integral with the upper end of the handle so that the bundles extend fanwise in the recess and beyond the upper edge of the triangular body, each bundle of wires being secured to the upper edge of the triangular body by a ring which groups together the son of said bundle, the set of these rings determining the range of bundles of threads, being preferably obtained by sewing in the upper edge of the triangular body; the material, the length and the diameter of the wires being chosen so that their rigidity is adapted to the production of the scratched effect;

• a brush (preferably nylon bristles) for brushed or combed effect and having the particularity that the tufts of hair are not equalized at their ends; A multi-lamellar spatula with strip or streak effect structures comprising, on the one hand, a support comprising a base and possibly a handle, and, on the other hand, a flexible blade allowing decorative motifs referred to as "structures" consisting of two superimposed plates:

-> a large base plate whose outer longitudinal edge or edges is or are intended to come into contact with the paste to produce the pattern, the nature of the material constituting this large plate and its dimensions being chosen so that the flexibility is adapted and facilitates the creation of decorative motifs; - •> a small plate that gives an extra thickness to the blade in its inner portion to be fixed on the base, the thicker inner portion being more rigid than the flexible outer portion comprising only the large plate. According to yet another of its aspects, the present invention relates to a decorative coating kit characterized in that it comprises the dry composition defined above, the notched trowel and optionally a smoothing spatula, and at least one of the components or accessories hereafter: → at least one specific primer to make a sub-layer, -> a sponge to produce shade effects,

→ specific dyes to perform coloring, - »a product generating a white or colored veil to create a patinated effect, -> a wax or a varnish to make an outer layer of protection, -> the comb and the effect brush brushed as defined above, -> the spatula biplate structures as defined above,

-> a "debulking" roll of paints, as a spiked roller or to bulge.

Detailed description of the invention

The dry composition according to the invention has a judiciously established formula for mixing easily with a liquid, preferably water, in order to obtain a homogeneous paste, easily applicable (even by laymen) on a support, to using any known and appropriate means to obtain a coating having an aesthetic appearance imitating raw concrete. When the support is a surface (preferably interior) of a building (for example a wall or a ceiling), the realized coating constitutes a particularly aesthetic interior decorative coating, and this by offering the user the possibility of giving free rein to his creativity. Such a coating also has the advantage of not containing flammable products such as solvents. On the contrary, it is a product applicable in the aqueous phase, which benefits from excellent adhesion to the support and good durability over time, after drying and hardening. Another significant interest is its ability to be easily peeled using a conventional means to take off the wallpaper (stripper steam and spatula).

The composition according to the invention is advantageously in practice a powdery form, dry, that is to say containing for example less than 1% by weight of water. In quantitative terms, the dry composition according to the invention preferably comprises (in% by weight on a dry basis):

• 40 to 50 of cement,

• 40 to 50 charge, 1.5 to 2.5 of absorbing agent,

From 0.01 to 0.1 of a fibrous flexibility agent,

• from 0.1 to 0.8 of set retarder,

• from 0.1 to 0.5 wetting agent, • from 0.5 to 3 of decorative particles,

• from 2 to 8 hardener,

• and from 0 to 0.8 dye.

From a qualitative point of view, the dry composition according to the invention has the particularities mentioned below.

The cement advantageously comprises at least one white or gray cement having a suitable hardness.

It should be noted that the cement is chosen and is associated with other components of the formulation including the retarder and the hardener, so that the homogeneous paste prepared from the dry composition and water has a time of opening of at least

5 hours, preferably at least 10 hours, for example between 10 and 24 hours.

This is the time during which the dough remains soft enough to be applicable on the support.

As regards the charge, it preferably has a particle size of less than or equal to

0.2 mm and comprises plaster, calcium carbonate and resin, and optionally various other adjuvants.

The absorbent agent is intended to give the coating a peelable character by conventional means: steam stripper and spatula.

The absorbent agent selected according to the invention is preferably an agent of the type comprising cellulose fibers, with a length of between 100 and 3000 microns, preferably between 100 and 1500 microns.

The flexibility agent is intended to give flexibility to the coating by forming within it, a flexible armature.

The fibrous flexibility agent preferably comprises, for its part, polyacrylonitrile and / or polyacrylate fibers. These fibers advantageously have an average length of between 4 and 50 mm, preferably between 5 and 15 mm, and for example of the order of 8 mm. According to a remarkable characteristic, the set retarder comprises tartaric acid and / or its derivatives.

The wetting agent makes it possible to promote the diffusion of any dyes used.

It is preferable according to the invention that the wetting agent comprises hexametaphosphate and / or its derivatives.

Since the invention relates to a concept of interior decoration, the decorative particles are an important component of the composition according to the invention. Preferably, these decorative particles are of mineral origin and are rather selected from the group comprising vermiculite, perlite, micas and mixtures thereof. These decorative particles may be in various forms: for example flakes, pellets, spherical particles, crystalline particles, needles, son of different colors, such as gold, black, beige, etc.

The hardener is one of the common products in the field of cements and concretes, but according to the invention, it is advantageously chosen from the group comprising polyvinyl alcohol / silane copolymers and mixtures thereof.

Naturally, the composition according to the invention is not limited to the preferred formulations defined above. The addition of additives to give it various features, is perfectly conceivable. Thus, biocidal additives can be, for example, properly incorporated into said composition. Advantageously, a biocide with a broad spectrum of destruction efficiency of bacteria, moss, mold, algae and various undesirable microorganisms will be chosen.

The abovementioned composition is a dry powdery composition, obtained by mixing all these pulverulent components, by means of suitable industrial mixers. This composition is then packaged in bags, for example 10 kg. It is clear that this composition is stable over very long durations, so that dry powder form is the one best suited to marketing.

Of course, the marketing of a homogeneous paste obtained from the mixture of the dry composition and water, could also be considered. But then it is necessary to take into account the stability problems and to implement ways to avoid curing by drying. The invention also relates to the preparation of the paste applicable on a support to produce the decorative coating imitating concrete. This preparation is easily done without sophisticated mixing equipment. The user simply has to dissolve the dry composition in water and mix thoroughly to obtain a homogeneous paste. Advantageously, the mixture is made using an electric mixer.

The target viscosity for the dough is for example between 50,000 and 100,000 centipoise, preferably between 60,000 and 80,000 centipoise, in particular of the order of 70,000 centipoise. The mixing proportions are, for example, 10 kg of pulverulent composition for 4 to 8, preferably 4 to 7, for example 5 liters of water. The powder composition / water proportions may vary, depending on the consistency desired for the dough. In particular, this paste may be of foamy consistency, does not stain, allows a creamy application on the supports in thin thickness of 2 to 5 mm, and when it dries, gives a coating that has a touch "concrete", a aspect "concrete" and a hardness "concrete", and which, moreover, is peelable to the wallpaper stripper.

The method of producing a concrete appearance decorative coating on a support, for example a wall, by applying the paste obtained by mixing water and composition as explained above, comprises the steps (b) of application, preferably to the notched trowel, a layer of paste on the support and step (c) of smoothing this layer, preferably with the aid of a smoothing spatula. Steps (a), (d), (e), (f), (g), (h) of the process for producing the coating according to the invention are advantageous and optional.

Prior to step (a), it may be necessary to clean the surface to be coated, so as to remove dust and possible fatty deposits that are likely to hinder the attachment. If the surface has a satin or glossy coating, if it is slippery, or in other words not conducive to the attachment of the decorative coating according to the invention, it is desirable to break the continuity of this surface by sanding to the using sandpaper, or scratching, lacerating or puncturing using a suitable tool.

The optional step (a) of preparing the support with a specific sub-layer consists in coating the surface of the support with a product consisting of an aqueous insulating sub-layer, slightly granite. This application is advantageously carried out using a roller or a brush. By way of example, it may be noted that the deposition rate of this specific underlayer product is 200 g to 500 g per m ² depending on the support.

The step (b) of application of the paste layer obtained by mixing water and the aforementioned composition preferably takes place using a notched trowel. This notched trowel is shown in Figures 1 and 2 attached. Figure 1 is a perspective view of three-quarter side, Figure 2 is a top view of this notched trowel.

The notched trowel comprises a handle 1 connected by a rod 2 to a plate 3 of generally rectangular shape and whose two longitudinal edges and one of the transverse edges are provided with notches 4 and teeth 5. The transverse edge provided with notches 4 and teeth 5, is that arranged on the same side as the longest part of the handle 1, relative to the rod 2. The notched trowel is for example made of plastic such as polycarbonate. This notched trowel makes it possible, even for a neophyte, to obtain a perfect regularity of thickness on the whole surface of the support, and in particular in all the nooks of a room when the support is formed by the walls or the ceiling of a building. This thickness of deposition is controlled by the shape and the dimension, and thus by the cutting of the teeth 5 and notches 4. The dimensions chosen are in particular the height of the teeth 5 and the length of the notches 4. For example, this height of teeth may be of the order of 5 mm and the length of the notch 4 of the order of 1 cm. The amount of paste deposited on the support with the aid of this notched trowel corresponds to the right amount necessary to then create the decorative patterns with the appropriate tools. Incidentally, this regularity of thickness allows a more uniform drying and thus even smoother smoothness (steps c and g). The deposition rate of step (b) is for example between 1 and 2 kg, preferably between 1.5 and 1.7 kg.

The layer obtained in step (b) is smoothed in step (c) by means of a conventional smoothing spatula.

The smooth surface state thus obtained may be that of the final coating or may serve as a matrix for producing decorative patterns on the uncured coating, using suitable tools (step d). The tools that can be used in this step (d) are in particular: i) the fan comb for a scratched effect, ii) the brush, preferably with brushed or combed nylon bristles, iii) the biplate spatula with streak or streak effect structures , iv) the pinned or bulging roller to obtain the effects of the same name. The tools (i, ii, iii, iv) are new tools within the meaning of the invention.

i) The comb comb for effect scratched This tool is shown in Figure 3 attached.

Figure 3 is a front view of this fan comb.

This fan comb (i) consists of a support part 6, preferably made of wood, integral with a fan 7 formed of bundles 8 each having a plurality of flexible wires 9, preferably metal. The metal chosen is, for example, hardened steel. The support portion 6 comprises a handle 10 extended by a body 11, of triangular shape having a recess 12 at its center, delimited by the two lateral edges 13a, 13b and the upper edge 14, slightly curved, of the triangular body 11, d firstly, and by the upper end portion of the handle 10, on the other hand. The fan 7 is constituted by a bundle of wires 9, whose base 15 is held by a ferrule 16, integral with the upper end portion of the handle 10. The bundles 8 of wires 9 extend from the base 15, beyond the upper edge 14 of the triangular body 11. Each beam 8 is partially supported on the upper edge 14 of the triangular body 11. Moreover, a seam 17 made from a wire (preferably metal) allows to secure each beam to the upper edge 14 by defining rings 18 each grouping a beam 8. The rings 18 can be likened to the holding riders of each beam 8 or packets 8 son 9. This seam 17 passes through holes 19 formed in the upper edge 14. Advantageously, the portion of the fan 7 of beams 8 extending beyond the upper edge 14 of the triangular body 11 represents for example between 30 and 40% of the total length of the comb venta. it (i), from the upper end of the fan to the lower end of the handle 10.

The length, the diameter and the constituent material of the threads 9 are chosen so that their rigidity or their flexibility allows the realization of the scratched effect of decoration. The diameter of each wire is for example between 0.1 and 1 mm, preferably on the order of 0.30 to 0.40 mm. Each bundle comprises, for example, around ten wires 9. The part of the fan 7 extending beyond the upper edge 14 is approximately 50 to 100 mm, for example 60 to 75 mm, the triangular body 11 is extending between the portion of the upper end of the handle 10 and the upper edge 14 has a length substantially equal to that of the portion of the fan 7 extending beyond the upper edge 14, for example 70 to 90 mm .

The son 9 of the comb comb have for example a diameter of the order of 0.35 mm. The upper edge 14 of the triangular body 11 of the comb fan 7comprend a series (for example eighteen) of holes 19 of diameter eg 2 mm which are an integral part of the seam 17 for the realization of rings 18 grouping bundles of son 8 9. The distance between two seam holes is eg 4 mm.

To facilitate the grip of the fan comb (i), the handle may include a thumb mark, obtained for example by screen printing.

ii) - Brush, preferably with brushed or combed nylon bristles

This tool is shown in Figures 4 and 4a.

Figure 4 is a side view of the brush, preferably nylon bristles, for brushed or combed effect. FIG. 4BIS is a cross-sectional view along the line IV-IV of FIG. 4.

This brush comprises a handle 20, preferably made of wood, integral with tufts of hair

21. These tufts of hair, preferably nylon, have the characteristic that their free ends are not equalized, so that each tuft 21 has bristles, preferably nylon, of different lengths.

This brush (ii) can be of variable dimensions (including length) to create different patterns.

iii) - Spatula biplaque structures streak effects or streaks This new tool is shown in Figures 5 to 12 attached.

Figure 5 is a rear three-quarter view in perspective of a first embodiment of the biplate spatula structures.

Figure 6 is a rear three-quarter perspective view of a second embodiment of the structural two-ply spatula. FIG. 7 is a view from above of the support common to the two embodiments of FIGS. 5 and 6.

FIG. 8 is a side view of FIG. 7 according to a preferred embodiment of the support of FIG. 7.

FIG. 9 is a side view according to an alternative embodiment of the support of FIG. 7.

FIG. 10 is a view from above of the flexible blade of the first embodiment of FIG. 5.

FIG. 11 is a view from above of the flexible blade according to the second embodiment of FIG. 6. FIG. 12 is a cross-sectional view along the line XII-XII of FIG. 10 or along the line XIF-XIF of Figure 11.

The two embodiments, FIGS. 5 and 6, of this two-ply structural spatula each consist of a support 22, preferably made of wood or plastic, comprising, on the one hand, a base 23 and a handle 24 and, on the other hand, a flexible blade 25 intended to come into contact with the uncured coating to shape decorative patterns with structures. The support 22, preferably made of wood, is shown in detail in FIGS. 7, 8 and 9. FIG. 8 shows a preferred embodiment of the support 22 in which the base 23 integral with the handle 24 comprises a recess 27 intended to reversibly or non-reversibly receive one of the longitudinal edges of the flexible blade 26.

In the variant of Figure 9, the base 23 comprises a housing for reversibly receiving or not, one of the longitudinal edges of the flexible blade 25, which this time is not a recess but a slot 28. According to a preferred embodiment of the invention, the length of the base 23 is less than the length of the flexible blade 25, so that the latter protrudes at both ends of the base 23 as shown in Figures 5 and 6. According to a variant, the length of the flexible blade 25 may be substantially the same as the length of the base 23. Also provided are reversible attachment means, the flexible blade 25 on the base 23, namely in the occurrence of the screws 29 which pass through the flexible blade 25 via perforations 30.

This flexible blade 25 consists of two superimposed plates: a large base plate 31 and a small plate 32. In a first embodiment of the flexible blade 25 (FIGS. 5 and 10), the large base plate 31 has a portion 3, preferably 3 and preferably three, these strips 3 IE being intended to come into contact with the layer smoothed in step (c) not yet hardened, to produce decorative patterns by performing differences in reliefs. In this case each lamella 3 IE generates a scratch. In the second embodiment of FIGS. 6 and 11, the flexible blade 25 has a large single-blade base plate 31 whose outer longitudinal edge is intended to come into contact with the smoothed layer of step (c) for shaping decorative patterns in relief, by creating waves that give a pleated or striated effect, after hardening of the coating. The large base plate 31 and the small plate 32 are optionally laminated and / or then secured to one another by means of the screws 29. The large base plate 31 thus has one or more external longitudinal edges intended come into contact with the dough to produce the decorative pattern. The nature of the constituent material of this large base plate 31 and its dimensions are chosen so that the flexibility of said large base plate is adapted to and facilitates the creation of decorative patterns in relief.

The small plate 32 gives an extra thickness to the flexible blade 25 in its inner part intended to be fixed reversibly or not on the base 23. Naturally, the thicker inner part of the flexible blade 25, is more rigid than its part outside which includes the outer longitudinal edge or edges of the large base plate 31.

The constituent material of the large base plate 31 is for example a polymer such as polypropylene, transparent or not (in this case transparent), while the small plate 32 is advantageously made of a polymer material, for example a colored polypropylene or not, in this case opaque white.

According to another alternative embodiment, the support 22 may not comprise a handle 24 but simply a base 23 on which is mounted reversibly or not, a flexible blade 25. The present invention also relates to the use of a paint "debulking" roller, such as a pin or bulging roller, to produce, during step (d), decorative patterns consisting of holes on the smoothed layer at the same time. step (c) and not yet cured (pimple effect or bush-hammered effect).

- Figure 13 attached shows front of such a pin roller.

This is an innovative use of a "debulking" paint roller, for example floor paint.

The optional step (e) of the method of producing a decorative coating according to the invention corresponds to another way of creating decorative patterns on the layer smoothed in (c), hardened, or possibly decorated by decorative patterns made to using the tools according to step (d). In this step it is a question of using a sponge, preferably wet, to bring out slight effects of shades (whiteness / coloring). Indeed the washing can eliminate the color of some areas to make them whiter and thus create a contrast with other colored areas.

It is also possible, according to the optional step (f), to apply "white haze" or color on the smoothed, cured, and optionally decorated layer according to (d) and / or (e), so as to obtain other decorative shades such as for example a patina. More specifically, the white or colored veil is obtained for example by mixing with water a white or colored powder of mineral nature by applying it on the coating with a brush e.g. to give it a weathered or aged appearance. The white veil appearance appears after drying and can be faded simply by rubbing it with a dry cloth to obtain the desired decoration.

As has already been pointed out before, the concrete-look decorative coating according to the invention is advantageously white at the base and can be colored, preferably in gray, which is a widely used color for concrete or cement structures. This does not exclude stains in other colors than the basic white color with specific dyes.

Regarding the step (g) of drying curing, it may be considered that under normal conditions of temperature and humidity, the duration of this step (g) is for example between 24 and 48 hours to obtain a drying and a complete cure. According to the optional step (h) of the process according to the invention, it is preferable to use, with the aid of a spalter, a wax or protective varnish capable of rendering the coating washable and giving it a waxed appearance. finishing.

According to the present invention, the term "wax" is considered in its broadest sense, which includes all varnishes of wax appearance.

As an illustration, it can be indicated that the degree of deposition of the wax in this step (h) is for example between 80g and 120g / m ² .

Part of the decorative patterns obtained with the means and methods according to the invention are irregularities of relief. These can be created simply by voluntary or involuntary use of a tool. For example, the striped effects (striped biplate spatula) are like the marks left by the concrete shuttering boards. According to an alternative of the invention, such irregularities of relief, or more precisely discontinuities, can be produced by applying removable elements on the surface to be coated itself. It can be for example decorative signs, letter, number, symbol, graphic design, straight line, broken, curve, adhesive piece, adhesive tape, etc. These removable elements are removed at any time and ultimately leave their fingerprints. All of the above-mentioned ornamental effects are not covered by patent protection and therefore will not be more precisely described in this application.

Naturally, the present invention is not limited by the decorative patterns that can be made on the coating in question. The user can indeed give free rein to his creativity and his talent to achieve a successful aesthetic result, bearing the personality of the user.

As indicated above, the present invention is also directed to a decorative coating kit as defined in claim 17. This kit may also include instructions for use.

An example of a formula of the dry composition according to the invention is given in the table below.

Total bag 10 kg

Claims

-1- composition intended in particular to be mixed with water to prepare a paste applicable to a support such as a surface (eg interior) of a building, to achieve a decorative coating, characterized in that it comprises (in% mass on dry):

• from 30 to 60 of cement,

• from 30 to 60 charge,

From 0.5 to 10 of at least one absorbent agent,

From 0.01 to 1 of at least one flexible fibrous agent, from 0.01 to 3 of at least one set retarder,

From 0.01 to 1 wetting agent,

From 0.1 to 20 of decorative particles,

From 0.5 to 10 of at least one hardener,

And from 0 to 1 of at least one dye.

Composition according to Claim 1, characterized in that the filler, which preferably has a particle size less than or equal to 0.2 mm, comprises plaster, calcium carbonate and resin.

-3- Composition according to claim 1 or 2, characterized in that the absorbent agent comprises cellulose fibers of length between 100 and 3000 microns, preferably between 500 and 1500 microns.

Composition according to any one of Claims 1 to 3, characterized in that the fibrous flexibility agent comprises polyacrylonitrile and / or polyacrylate fibers.

-5- Composition according to any one of claims 1 to 4, characterized in that the retarder comprises tartaric acid and / or its derivatives.

Composition according to any one of Claims 1 to 5, characterized in that the wetting agent comprises hexametaphosphate and / or its derivatives.

-7- Composition according to any one of claims 1 to 6, characterized in that the decorative particles are of mineral origin and are preferably selected from the group consisting of vermiculite, perlite, micas and mixtures thereof. Composition according to any one of claims 1 to 7, characterized in that the hardener is selected from the group comprising polyvinyl alcohol / silane copolymers and mixtures thereof.

Process for the preparation of a paste which can be applied to a support for producing a decorative coating, characterized in that it essentially consists in mixing a given quantity of the composition according to any one of Claims 1 to 8 with a given volume. of water.

-10- A process for producing a decorative coating on a support by applying the paste prepared by the process according to claim 9.

Process according to claim 10, characterized in that it consists essentially of: a- optionally preparing the support, with a specific sub-layer; b- to apply, preferably using a notched trowel, at least one layer of paste on the support optionally coated with the underlayer obtained in -a-, c- to smooth the layer obtained in -b- by means of a smoothing spatula; d- optionally to achieve, with the aid of suitable tools, decorative patterns on the layer smoothed -c- and not yet hardened; e- optionally washing the smoothed-c- layer, cured and optionally decorated with patterns obtained in step -d-, passing a preferably wet sponge to produce shades effects (whiteness / coloration); optionally to apply a white or colored haze to the smoothed-c- layer, cured, and optionally decorated according to step -d- and / or -e-, so as to obtain other decorative shades, preferably a patina; optionally curing the layer smoothed at -c- and optionally decorated according to step -d- and / or -e- and / or -f-; h- possibly to apply, preferably with a spalter or sponge, on the smoothed layer -c-, preferably hardened and optionally decorated according to step - d- and / or -e- and / or -f - A wax or protective varnish, able to make the coating washable and give a waxed appearance to the finish.

Process according to claim 10 or 11, characterized in that a paint "debulking" roller is used, such as a spiked or bunched roller, to produce, during the step -d, decorative patterns consisting of small holes on the layer smoothed in -c- and not yet hardened (pimpled effect or bush-hammered effect). -13- coating obtained by the method according to any one of claims 10 to 12, characterized in that it is peelable with means adapted for the takeoff of the wallpaper and using a spatula.

Tools for carrying out the method according to any one of claims 10 to 12, characterized in that they are selected from the group comprising:

• a brush (preferably nylon bristles) for brushed or combed effect and having the particularity that the tufts of hair are not equalized at their ends;

A two-plata spatula with strip or streak effect structures comprising, on the one hand, a support comprising a base and possibly a handle, and, on the other hand, a flexible blade making it possible to produce decorative motifs called "with structures" and constituted two superimposed plates:

-> a large base plate whose outer longitudinal edge or edges is or are intended to come into contact with the paste to produce the pattern, the nature of the material constituting this large plate and its dimensions being chosen so that the flexibility is adapted and facilitates the creation of decorative motifs;

- »A small plate that gives an extra thickness to the blade in its inner portion to be fixed on the base, this thicker inner portion being more rigid than the flexible outer portion comprising only the large plate. -15- Tools according to claim 14, characterized in that the flexible blade of the multi-lamellar spatula structure is selected from the group of flexible blades comprising: a flexible structure plate in which the large base plate has an outer portion several lamellae (preferably three) to produce a decorative pattern with striped effects, each lamella generating a scratch; a flexible structural blade in which the large base plate is single-blade to produce a pleated (or streaked) decorative pattern.

-16- Tools according to claim 14 or 15, characterized in that the support of the multi-lamellar spatula structures is selected from the group of supports comprising: a support whose base comprises a slot for receiving reversibly one longitudinal edges of the flexible blade; a support whose base comprises a recess for reversibly receiving one of the longitudinal edges of the flexible blade; the length of the base being preferably less than the length of the flexible blade, so that the latter protrudes at least one end (preferably at both ends) of the base.

-17- Decorative coating kit for building surfaces, characterized in that it comprises:

The composition according to any one of claims 1 to 8,

The notched trowel according to claim 14,

• optionally a smoothing spatula,

• and at least one of the following components or accessories: -> at least one specific primer to make a sub-layer,

→ a sponge to produce shades effects,

-> specific dyes to perform colorations,

-> a product generating a white or colored veil to create a weathered effect,

A wax or a varnish for producing an outer protective layer, the fan comb and the brush for a brushed effect according to claim 14,

→ the biplate spatula with structures according to claim 14, 15 or 16,

-> a "debulking" roll of paints, as a spiked roller or to bulge.