BE1028027B1 - FOAMED PROFILE PART FOR INDIRECT LIGHTING - Google Patents

Abstract

The invention relates to polymer foam profile parts with a polygonal cross-section, which comprise a rear side, which is intended to be fastened to a wall, a front side which is visible in the fastened state, and a top side which comprises a recess which can be used for attaching a light source, In particular, an LED strip is suitable, the polymer foam being a foam comprising polystyrene with a density in the range from 15 to 500 kg / m 3, preferably from 30 to 400 kg / m 3, and a pigment system which has a or comprises several pigments, the pigment system making up 0.1 to 3% by weight, preferably 0.2 to 2% by weight, more preferably 0.25 to 1.5% by weight, of the total weight of the polymer foam. The invention further relates to a kit for indirect lighting which comprises one or more polymer foam profile part (s) and one or more LED strips, as well as a method for producing such profile parts.

Description

FOAMED PROFILE PART FOR INDIRECT LIGHTING Technical Field 10001] The present invention relates to stucco elements or profile parts for indirect lighting of a room. State of the art 10002] Profile parts, the purpose of which is indirect lighting, are known and, thanks to the spread of light emitting diodes (LED), new possibilities have been offered which affect their lifespan, their ability to change color and, more recently, their installation are caused by light strips, indirect lighting is a decorative element that is increasingly being used to create variable lighting moods.

By definition, (completely) indirect lighting goes hand in hand with the fact that the light source remains invisible and that the light radiated therefrom spreads in an indirect way, through what is known as diffuse reflection on the walls, ceiling or floor. As a variant, the light source can be visible in the case of partially indirect lighting, the lighting nonetheless being partially by diffuse reflection on the walls, the ceiling or the floor. 10004] The source of illumination is therefore often mounted in a carrier that is open in a direction that cannot be seen by the user, being at a certain distance from an obstacle that is responsible for the diffuse reflection that occurs in the generally upwards on a ceiling, downwards on the floor, to the side on a (other) wall, for example in a corner of a room.

Even if the light source is not directly visible, a satisfactory effect of completely indirect lighting is only achieved when the light is not visible through the support. Even in the case of partially indirect lighting, it is only desirable for aesthetic reasons that the light ring through the wearer. This is generally not a problem if the carrier consists of a dense / compact material of a certain thickness, which is thus opaque, but it becomes problematic in the case of carriers made of foamed polymer materials, the more the lower the density of the same, the more problematic is.

Polymer foams are cell-based substances that mainly consist of gas-filled cells which are surrounded by a thin polymer membrane. Consequently, the lower their density, the more translucent these foams are, 10007] The solution to the problem of the translucent nature is to provide the support with an opaque layer, for example an aluminum foil, which is arranged on the hidden surface in which the Light source is attached, and / or with a layer of paint, which is either also on this hidden surface or on the surface that is visible to the user.

Although the carrier, if they are in the form of stucco elements or Profiliteiien, are actually painted in practice on the visible side, for example with the same color as the wall or ceiling, possible defects of such a paint layer emerge very clearly when the light source is switched on.

Object of the invention

An object of the present invention is therefore to produce light stucco elements or light profile parts from foamed polymer material with a low to very low density, which are sufficiently opaque to be used as a carrier of (completely or partially) indirect lighting, in particular by means of LED Luminous strips, to be used without a subsequent step of removing the light transmission, for example by applying an aluminum or paint layer, is required.

General description of the invention 10010] In order to achieve the above-mentioned object, the present invention provides, in a first aspect, a polymer foam profile part with a polygonal cross-section, which has a rear side, which is intended to be attached to a wall, a front side, which is visible in the attached state, and comprises an upper side which comprises a recess which is suitable for attaching a light source, in particular an LED strip.

The recess, that is, a surface which is set back and is located below the upper level of the edge as it is formed between the upper side and the visible side, has dimensions suitable for mounting the light source, for example a width and a height of 1 to 3 cm, or even more.

The polymer foam is a foam that comprises polystyrene, the foam having a density in the range from 15 to 500 kg / m 2, preferably from 30 to 400 ka / m °, and a pigment system that contains one or more Comprises pigments, the pigment system making up 0.1 to 3% by weight, preferably 0.2 to 2% by weight, more preferably 0.25 to 1.5% by weight, of the total weight of the polymer foam, 10011} In a second aspect the invention provides a kit for (fully or partially) indirect lighting, which comprises one or more of these polymer foam profile parts and one or more LED strips, possibly one or more transparent or translucent covers, which are suitable to be attached to the recess These covers can preferably be attached in a releasable manner, for example by snapping in or clamping, or in a non-releasable manner by means of an adhesive connection. 10012] A third aspect of the invention consists in a method for the production of polymer foam profile parts with a polygonal cross-section, which comprise a rear side, which is intended to be fastened to a wall, a front side which is visible in the fastened state, and a top side, which comprises a recess for attaching a

Light source, in particular an LED strip, is suitable, comprising the following steps: {a} metering in of polymers comprising polystyrene, a pigment system comprising one or more pigments, and possibly further additives and auxiliaries, {b} plasticizing the Ingredients in an extruder to obtain a homogeneous mixture, {c) mixing and pressurizing the homogeneous mixture to obtain a single-phase mixture,

(d} progressive cooling of the single phase mixture to maintain the pressure required to bring the propellant (s) into solution,

{8} Introducing the single-phase mixture into a shaping tool in order to form a raw profile part from polymer foam,

{A guiding the raw profile part made of polymer foam formed in this way through a calibration system, which may be operated with temperature control, in order to obtain the polymer foam profile part with a polygonal cross-section,

{9} possibly motorized pulling of the

Polymer foam profile part with a polygonal cross-section,

wherein the method comprises adding one or more physical propellants, either by metering in step (a) in the case of propellants that are liquid or solid at room temperature, or by introducing under pressure via an injection port after step {b} in the case of Propellants that are gaseous or liquid at room temperature, or both, the pigment system being 0.1 to 3% by weight, preferably 02 to 2% by weight, more preferably 0.25 to 1.5% by weight, of the total weight of the Polymer foam. 10013] A fourth aspect of the invention relates to the use of a

Polymer foam profile part or a kit for indirect lighting according to

Invention for completely or partially indirect lighting or for warning lighting.

In the context of the invention, warning lighting is a lighting that is particularly intended to either draw the attention of a passer-by to a particular point or to a message that is displayed at this point, or to report a status using a color code (for Example green: clear route, 5 correct operation, etc .; red: blocked route, access forbidden, disrupted operation, etc.) or to indicate a direction, for example by a flashing or moving motif, or for emergency lighting, for example in the case of a Power failure, fire, etc.

Surprisingly, the inventors have found that the use of pigments, even in very small amounts, compared to the concentrations recommended for coloring, makes it possible to make polymer foam profile parts made of polystyrene opaque, even in the case of profile parts with a relatively small thickness, for example 1.5 cm or more. In the present context, the thickness is the minimum value of the distance that the light from the indirect lighting, as arranged in the recess, has to travel through the cross-section of the profile part in a direction that can be seen by a user, whereby this thickness generally represents the smallest distance between the surfaces of the recess and the visible front side. Surprisingly, the amount of pigment that is required to achieve satisfactory or even complete opacity under laboratory conditions in a darkroom with a highly focused light beam is small and generally much lower than the amount specified by the pigment manufacturer Indeed, the inventors have discovered that, contrary to what might be expected, perfect opacity can be achieved even if the pigment system is as little as 1 to 3% by weight, preferably even 0.2 to 2% by weight, or even only 0.25 to 1.5% by weight, of the total weight of the polymer foam 10015] Although the pigment systems may contain dyes, they preferably contain mainly organic or inorganic pigments.

The pigment or pigments of the pigment system are advantageously inorganic pigments, 10016]. Such a pigment system is advantageously added to one or more polymers in the form of a premix.

In such a case, the pigment system preferably comprises polystyrene as the polymer, possibly in connection with other polymers, in particular with those which are mentioned below as further copolymers.

The pigment or pigments advantageously make up from 20 to 70% by weight, preferably from 25 to 65% by weight, of the pigment system in order to facilitate the metering and homogeneous mixing of the same in the extruder.

It can be particularly advantageous that the polymer (s) of the pigment system is / are the same as that / those of the polymer foam (without pigment system). 10017] The color of the pigment system will be decisive for the visual perception of the appearance of the surfaces of the polymer foam profile part with a polygonal cross-section, although this of course mainly affects the visible front after application.

In principle, a large number of pigment systems with different hues can be useful.

For example, the colors light oak, 8001, PBH KS 05278/5: medium light oak, 8003, PBH KS 04748/2; Dark oak, 8019, PBH KS 04698/2; Antilles green, 6021, PBH KS 3524/2, dark green, 6005, PBH KS 3521/2, ocean blue, 5012, PBH KS 4562/2; Jeans blue, 5001, PBH KS 4568/2; Lavender blue, 5009, PBH KS 4665/2, Riviera blue, 5023, PBH KS 4945/11; Baskenrot, 3004, PBH KS 5421/3; Grau, 7042, PBH KS 62738/2 by A.

Schuiman Plastics BVBA / LYONDELLBASELL should be mentioned. 10018] Furthermore, surprisingly, the inventors have discovered that pigment systems of white hue are generally unsuitable for use in the context of the present invention. in fact, it was surprisingly found that the results in terms of opacity were insufficient even at high concentrations,

which by far exceeded the amounts specified by the pigment manufacturer to achieve a completely white color.

The inventors have also found that the results, as achieved with pigment systems of gray hue in terms of opacity, are particularly advantageous and, moreover, result in polymer foam profile parts that look particularly advantageous in the finished product with the lighting. This is because profile parts with a gray appearance come close to a white shade and generally have a neutral effect on the color shades of the paints which are used for the final finishing. 10020] Numerous pigment systems of gray color ion may be useful. In the present context, the "gray" hues represent a color spectrum which is characterized in that they convey only a weak color impression or no color impression at all. The inventors have found that the best results in terms of opacity are achieved with pigment systems of neutral gray hue, that is to say that they are essentially achromatic, with their gray tones also being relatively light! are. The pigment system is advantageously selected from Polybatch® Gray KS 62738/2 and Gray 8368 from À Schulman Plastics BVBA / LYONDELLBASELL, 20 ..., Polybatch® Gray KS 62738/2 from A. Schuiman being the preferred pigment system, pigment systems of gray Color can include systems of the Ruil type, for example (Ti, V, 5b} 02, pigments based on zirconium, in particular (Zr, Pr) SiO2, based on periclase (Co NDO, cassiterite (Sn, Sb) O, etc.) A black pigment such as carbon black, which is essentially composed of pure carbon, can be combined with white pigments such as titanium dioxide, in order to produce different shades of gray depending on the particle size and the coloring power of the carbon black.

An additional important advantage of the profile parts of gray hue is in fact their relatively light hue, which not only causes them to be opaque, but also that this is achieved without her

Color ion when applying a layer of paint leads to problems with respect to the hiding power. In other words, the gray color of the profile parts does not have a disadvantageous effect in comparison with conventional white profile parts.

The method is preferably carried out using several types of polystyrenes, which preferably differ in terms of their viscosity, alone or in a mixture with other (co) polymers, in particular styrene copolymers.

10023] In the process, the polymer composition of the profile part generally has a melt flow index (MFI) between 1 and 25, preferably between 5 and 23 g / 10 min., Measured at 200 ° C., with a weight of 5 kg . The Melt Flow Index (MFI) or Melt Flow Index (SFB, also known as Melt Flow Rate (MFR) or Melt Index (MD) is a method that is commonly used in the plastics industry to characterize thermoplastic materials This conventional and relatively simple method, which is described in the ASTM D1238 standard, can easily be used to subject production or delivery batches to a quality control.

Indeed, the polymer foam can comprise further polymers and copolymers which are compatible with the styrene polymer (s), in particular one or more copolymers of styrene and of one or more diene monomer (s). The copolymer (s) made from styrene and diene monomer (s) have better impact strength and better elasticity. They can be selected from the group consisting of the following: acrylonitrile-butadiene-styrene (ABS), styrene-butadiene-styrene (SBS), styrene-ethylene-butadiene-styrene (SEBS), styrene-butadiene in the form of block copolymers (for Example BASF Styrolux), or heterophase type (high impact polystyrene: High Impact Polystyrene, HIPS), styrene-acrylonitrile (SAN), polyphenylene ether (PPE), which is also referred to as polyphenylene oxide (PPO). Compounded mixtures of high impact polystyrene (HIPS) and polyethylene which have been made compatible with SBS or SEBS (POLIMERI KOBLEND P477E or FINA CPDC 9217) as well as mixtures of GPPS-PPO (general purpose polystyrene / polyphenylene oxide) or of can also be used HIPS-PPO (high impact polystyrene / polyphenylene oxide, such as NORYL). These further (co) polymers can be used alone (in addition to the polystyrenes or polystyrenes) or in mixtures.

10025] The foaming is generally carried out with a physical or chemical blowing agent! take place. The propellant can be a physical, a chemical propellant or a combination of two or more physical and / or chemical propellants. These are generally those that are commonly used in the manufacture of polystyrene foams. Suitable physical blowing agents include agents that are gaseous at ambient temperature and pressure, such as CO 2, nitrogen, short chain alkanes such as butane or isobutane, etc., and agents that are liquid at ambient temperature and pressure such as Pentane, (n-pentane or isopentane), hexane (all isomers), ethanol, dimethyl ether, etc. Among the chemical blowing agents, azodicarbonamide, a combination of citric acid and sodium hydrogen carbonate, OBSH, etc. should be mentioned. The chemical agents can also be used as so-called active nucleating agents in combination with one or more physical agents. The propellant is preferably a gas, for example CO ».

The propellant content to be provided depends of course on the nature of the propellant per se, but also on the desired density of the foam. For example, the percentage by weight of CO: in the case of direct gas introduction can be in the range from 0.01% to 5%, preferably from 0.015 to 3%.

10027] It is also possible, as required, to use the additives and auxiliaries which are customary in the field. These additives and

Auxiliaries can in particular consist of the nucleating agents (of a different kind than the chemical blowing agents), such as talc, calcium carbonate, silicon dioxide, etc., the flame retardants (which are halogenated, chlorinated, brominated, fluorinated) or not [hydroxides, phosphates, SS Expanded graphnite, ... j}, the UV filter, antioxidants, mineral fillers, reinforcing fibers such as fibers made of glass, cellulose, etc .; or combinations of these can be selected. 10028] If necessary, compounds can be added which allow the extrusion of the mixture of polystyrene (en), which are also referred to as lubricants! and are in particular those selected from the group consisting of esters of C4-Cao monoalcohols, fatty acid amides, polyethylene waxes, polyethylene oxide waxes, styrene-based waxes, C + -C4 alcohols, silicone-based, fluorinated compounds, etc., and mixtures thereof, these compounds are preferably used gene, which facilitate the extrusion of the mixture of polystyrene (s), introduced via a distributor ring at a suitable point of the extrusion tool, so that they line exclusively and uniformly the flow channel of the nozzle.

The lubricant is preferably selected from the group consisting of mineral oils, silicone oils and polymers with a lubricating effect.

If this is necessary or desired, the profile part made of polymer foam can furthermore comprise, at least on some of its sides, a coextruded layer, this coextruded layer forming a protective shell.

If this is the case, the manufacturing process furthermore comprises a step (a) of metering in polymers for the casing, and possibly additives and auxiliaries, (b ') of plasticizing these components of the casing in a second extruder to form a homogeneous mixture (c '} of mixing and pressurizing this homogeneous shell mixture in order to obtain a single-phase shell mixture, (d') of the progressive cooling of the single-phase shell mixture in order to maintain the pressure required to keep the propellant (s) in solution to bring, whereupon the

Material flow from the first extruder before or during step (e) is combined in the shaping tool with that from the second extruder. The shell may or may not be foamed. If the casing is also foamed, the method also includes adding one or more physical or chemical blowing agents to the second extruder, either by adding in step (a) in the case of blowing agents that are liquid or solid at room temperature, or by Introduced under pressure through an injection port after step (b '} in the case of propellants which are gaseous or liquid at room temperature, or both, These propellants may be the same or different from those used in the first extruder, being In general, however, they are those which have been described above in connection with the simple extrusion of a single material flow in the main extruder, which is also referred to as the first extruder in order to distinguish it from the (second) extruder for the casing.

In the process with coextrusion of a shell, the material of the shell of the profile part generally has a melt flow index (MFI), measured at a temperature of 200 ° C and under a weight of 5 kg, of at least 20, preferably of at least 25 g / 10 min. Furthermore, the melt flow index is generally at most 30, preferably at most 28 g / 10 min.

10030] The polymer composition of the shell of the profile part can be identical or different from the main polymer composition (of the first extruder).

It should be noted that polymer materials from recycling can continue to be used, which are compatible with the entirety of the components, for example waste from foamed profile parts, soft previously crushed, degassed and compacted.

10032] In connection with the invention, indirect lighting takes place by installing and connecting LED strips. An “LED strip” is to be understood as any type of lighting of a similar type, with

Lights that are monochrome, namely white or different colors, or of the type RGB (red, green and blue), RGBW (red, green, blue and white) and RGB + variable white. In the first case, the white light is achieved by switching on the three hues at the same time, whereas the other two cases enable more powerful white lighting, either with a single color temperature of the white hue or with several (from cold white to warm white). The LED strips or the like can be fastened in the recess on the upper side by conventional means, in particular by an adhesive connection. Brief description of the drawings

Further features and characteristics of the invention emerge from the detailed description of some advantageous embodiments, as set out below for the purpose of explanation, reference being made to the accompanying drawings. 1 (a) to (c): Cross-sectional representations of some examples of polymer foam profile parts with a polygonal cross-section. Fig. 2: Dimensions and shape in the transverse section of the profile part as it is used for the measurements in the example below. 3 (a) to (c) an embodiment of a polymer foam profile part with a polygonal cross-section (a) in the cross-sectional view, (b) in an isometric view and (c} detailed view of FIG. 3 (b). FIGS. 4 (a) to ( c): Embodiment of another polymer foam profile part with a polygonal cross-section (a) in the cross-sectional view, (b) in an isometric view and (c) detailed view of FIG. Ab). Description of a preferred embodiment 10034] FIGS. 1 (a), (b) and (c) show several examples of polymer foam profile parts in a cross-sectional representation. These profile parts are intended to be attached to a wall with their rear side 30, generally by gluing, for example with an adhesive for attaching polystyrenes. Since the profile parts for an indirect

Illumination are provided, they are placed at a certain distance, for example 10 to 50 cm or more, from a surface which is generally oriented at an angle of more than 45 °, more generally 90 °, being at This surface is, for example, the ceiling, the floor or, if it is installed in a corner that is made up of two walls, another wall. On the side which is opposite to the rear side 30, they have a visible front side 20 which remains visible after the profile part has been attached. The top has a recess 40 which makes it possible to install indirect lighting by means of LED strips or the like. 10035] As mentioned above, however, the profile parts must not be translucent if a satisfactory effect of indirect lighting is to be achieved, preferably even if there is no coating of paint, although such is generally applied. If the profile parts are translucent, That is to say, the light which is emitted by the LED strip would possibly bring out inadequate or uneven application of the coating material layer. 10036] Consequently, the light which is emitted by means of the indirect lighting must not penetrate the professional part (to a significant extent), even where its thickness E is smallest in the general direction of a user. This general direction of a user is to be understood in such a way that it corresponds to any direction in the interior of a room according to which the user, standing or sitting, could view the profile part or its visible surface.

Although the profile part does not have to be completely opaque at the point with the smallest thickness E, the latter is generally chosen such that it is at least 20, preferably at least 40 or even at least 100. The ratio between the intensity of the incident light (as it is from the LED strip in the direction of the

Area of the recess is emitted at the point with the smallest thickness E) and the intensity of the light transmitted (through the profile part at the same point, measured on the exit side of the profile part). 10038] example

A polymer foam profile part according to the invention with a polygonal cross-section was produced by extruding a composition containing 82.9 parts of fresh polystyrene, 15.0 parts of recycled polystyrene, 0.6 parts of nucleating agent and 1.5 parts of pigment system from Type Polybatch® KS 62738/2 from A. Schulman, which was foamed in the presence of 0.53 parts of CO: as a physical blowing agent. The profile part obtained had a density of 2030 kgm}. The dimensions (mn mm) of the ice cream and its shape in cross-section are explained in FIG. 10040] Observations:

According to the experiments, an amount of 1% by weight of Polybatch® KS 62738/2, a premix based on polystyrene and 26.4% by weight of inorganic pigments, which comprise carbon black and TiOs, is sufficient for this To achieve opacity that allows indirect lighting to be used. In the visual observations which the inventors made in a darkroom with three highly concentrated light beams irradiating the profile part, complete opacity was achieved with a thickness E of 0.75 cm.

Consequently, the application of a layer of white paint (white latex paint) did not change the opacity. 10043] The inventors have further found that the amount of pigment system of gray hue that is required to achieve sufficient opacity is relatively small, in the present case it is less than the amounts recommended by the manufacturer, which in the case of Polybatch® KS 62738/2 are, for example, 2 to 5% by weight in order to achieve the "intended" color.

10044] In addition, it should be pointed out that when the pigment system of gray color is used, a change in the density and / or the cell structure did not result in any noteworthy modification of the opacity.

Finally, the inventors carried out tests with other pigment systems, in particular with a white masterbatch of the POLYWHITE HS 87848 CL type, a premix based on polystyrene and 60% by weight of inorganic pigments, which comprises TiO ». As for the latter, however, even an amount of Dis at 25% by weight does not sufficiently improve opacity. 10046] FIGS. 3 (a) to (c) and 4 (a) to (c) show two examples of embodiments of a film foam profile part according to the invention, which has a front side 20, which is visible after attachment, and a rear side 30, which is generally is used to attach the profile part to a surface, in particular a wall, and comprises a recess 40 which is used to attach indirect lighting 50, in particular an LED strip. In the examples shown, the recess can furthermore be provided with a transparent or translucent cover 60 for aesthetic reasons, if the recess remains visible after attachment, or to facilitate cleaning by preventing dust from falling into the recess 40 and in this way hinders indirect lighting. The profile part of FIGS. 3 and 4 are particularly suitable for use as skirting boards in order to bring about partial indirect lighting over the wall (FIG. 3) or the floor (FIG. 4), or as a stucco element or cornice that / the is attached to the wall to provide indirect lighting on the wall when mounted without further devices (Fig. 4} or, when mounted in the recess 40, downwards (Fig. 3) or a partially indirect lighting of the Ceiling (Fig. 4) to effect by the profile part of Fig. 3 is attached to the wall near the ceiling in such a way that the recess faces upwards.

Legend: 20 Visible front side 30 Back side 40 Recess suitable for attaching indirect lighting 50 Device for indirect lighting, e.g. LED strips 60 Transparent or translucent lid or cover E Minimum value of the thickness, i.e. minimum value the distance that the light from the light source (LED strip) has to cover in order to penetrate the profile part.

Claims (18)

PATENT CLAIMS 1. Polymer foam profile part with a polygonal cross-section, which comprises a back side, which is intended to be attached to a wall, a front side which is visible in the attached state, and a top side which comprises a recess for attaching a light source, in particular an LED strip is suitable, the polymer foam being polystyrene with a density in the range from 15 to 500 kgm? preferably from 30 to 400 ka / m ", and a pigment system comprising one or more pigments, the pigment system 0.1 to 3% by weight, preferably 0.2 to 2% by weight, more preferably 0.25 to 1.5% by weight of the total weight of the polymer foam. 2. Polymer foam profile part according to claim 1, wherein the pigment or pigments of the pigment system are inorganic pigments. 3. The polymer foam profile part according to claim 1 or 2, wherein the pigment system is added to one or more polymers in the form of a premix, the pigment system preferably comprising polystyrene as the polymer, the pigment or pigments particularly preferably making up 20 to 70% by weight of the pigment system . 4. Foam foam profile part according to any one of the preceding claims, wherein the pigment system is of a gray color, preferably consisting of Polybatch® Gray KS 62738/2 and Gray 8368 from A. Schuiman is selected, the pigment system more preferably being Polybatch® Gray KS 62738/2 from A. Schuiman. 5. Polymer foam profile part according to any one of the preceding claims, wherein there are also welere styrene copolymers, preferably Acryinitil-Buladiene-styrene (ABS), styrene-butadiene-styrene (SBS), styrene-ethylene-butadiene-styrene (SEBS), high-impact polystyrene (HIPS) or mixtures thereof. 6. Polymer foam profile part according to any one of the preceding claims, wherein the minimum value of the opacity of the profile part, measured at the point with the smallest thickness E between the visible front side and the depression of the upper side, at least 20, preferably at least 40, particularly advantageously at least 100 , amounts to. 7. Kit for indirect lighting, the one or more polymer foam profile part (s) according to any one of the preceding claims and one or more LED strips and possibly one or more transparent or translucent covers suitable for the recess of the or the To be attached to polymer foam profile parts. 8. A method for the production of polymer foam profile parts with a polygonal cross-section, which comprise a rear side, which is intended to be fastened to a wall, a front side which is visible in the fastened state, and a top side which comprises a recess for attachment a light source, in particular an LED strip, wherein it comprises the following steps: {a} Adding polymers that contain polystyrene! comprise, a pigment system comprising one or more pigments, and possibly additives and auxiliaries, {b) plasticizing the ingredients in an extruder to obtain a homogeneous mixture, {c) mixing and pressurizing the homogeneous mixture to form a single-phase mixture {d) progressively cooling the single-phase mixture in order to maintain the pressure required to bring the propellant (s) into solution, {e}) Introducing the mixture, which is present in a single phase, into a shaping tool in order to form a raw profile part made of polymer foam to obtain the polymer foam profile part with polygonal cross-section, {g) possibly motor-driven drawing of the polymer foam profile part with polygonal cross-section, the method comprising adding one or more physical blowing agents, either by metering in step (a) in the case of blowing agents which are liquid at room temperature or are solid, or by introduction under pressure via an injection port after step (b) in the case of propellants which are gaseous at room temperature or liquid, or both, the pigment system being 0.1 to 3% by weight, preferably 0.2 to 2% by weight, more preferably 0.25 to 1.5% by weight s-%, of the total weight of the polymer foam, 9. The method according to claim 8, wherein the pigment or pigments of the pigment system are inorganic pigments. 10. The method according to claim 8 or 9, wherein the pigment system is added to one or more polymers in the form of a premix, the pigment system preferably comprising polystyrene as the polymer, the pigment or pigments particularly preferably making up 20 to 70% by weight of the pigment system . 11. The method according to any one of claims 8 to 10, wherein the pigment system is gray in color, preferably selected from Polybatch® Gray KS 62738/2 and Gray 8368 from A. Schulman, more preferably the pigment system is Polybatch® Gray KS 62738/2 from A. Schulman. 12. The method according to any one of claims 8 to 11, wherein several types of polystyrenes are used, which differ in terms of their viscosity, alone or in mixture with other styrene copolymers. 13. The method according to any one of claims 8 to 12, wherein there are further styrene copolymers, preferably acrylonitrile-butadiene-styrene (ABS), styrene-butadiene-styrene (SBS), styrene-ethylene-butadiene-styrene (SEBS), high grade impact-resistant polystyrene (HIPS) or mixtures thereof. 14. The method according to any one of claims 8 and 13, wherein the propellant gas is CO; acts. 15. The method according to any one of claims 8 to 14, wherein compounds are added which facilitate the extrusion of the mixture of polystyrene (s), being selected from the group consisting of the esters of C4-C20 monocalcohols, the fatty acid amides , polyethylene waxes, polyethylene oxide waxes, styrene-based waxes, Cy-C, -alcohols, silicone-based or fluorinated compounds and mixtures thereof, 15. The method according to claim 15, wherein the compounds which facilitate the extrusion of the mixture of polystyrenes are introduced via a distributor ring at a suitable point of the extrusion tool so that they line exclusively and uniformly the flow channel of the nozzle. 17. The method according to any one of claims 8 to 16, wherein the additives and auxiliaries are selected from nucleating agents, flame retardants, UV filters, antioxidants, mineral fillers, reinforcing fibers or combinations thereof. 18. Use of a polymer foam profile part according to any one of claims 1 to 6 or one or a kit according to claim 7 for completely or partially indirect lighting or for warning lights.