MXPA98006620A - Retrorreflexive traffic signal resistant to rocio, which has a texturized glass surface - Google Patents

Abstract

The present invention relates to a retroreflective traffic signal resistant to spray, having a glass plate facing the front, fixed. The glass plate has a textured surface exposed to air. The textured surface imparts anti-glare properties to the signal. A manufacturing method of the dew-resistant traffic signal is also described

Description

RETRORREFLEXIVE TRAFFIC SIGNAL RESISTANT TO ROCÍO, WHICH HAS A TEXTURED GLASS SURFACE Introduction To be effective, road signs must be visible to drivers of motor vehicles at night as well as during the day. Because it is not practical to illuminate all traffic signals with external lighting, a common approach to improving the visibility of road traffic signals is to use retroreflective graphics on the traffic signal. Retroreflective signals have the unique ability to return a substantial portion of the incident light back to the light source. At night, the light of the headlights of the motor vehicle collides with the retroreflective graphics and is retroreflected towards the driver of the motor vehicle. The bright image displayed by the retroreflective signal makes the signal easier to read and provides motorists with more time to react.

Ref.028051 A significant problem that has been encountered with retroreflective traffic signals is the accumulation of water droplets on the surface of the signals. Dew is a particularly common source of water droplets and can be particularly problematic because it occurs predominantly at night when retroreflective signals are operative. When presented on a traffic signal in the form of water droplets in the form of small microspheres, dew can seriously alter the trajectory of incident and retroreflected light. This can make information about traffic signals much harder to read for passing motorists. This problem is very well known, and there have been a variety of attempts directed at removing dew or preventing dew from forming on the surface of traffic signals. One method to eliminate the dew from retroreflective signals is to heat the retroreflective element. German Patent No. 4226266 to Gubela discloses an electric heating element placed below the retroreflector. European Patent Application No. 0155572, assigned to Biersdorf Aktiengesellschaft describes a retroreflective traffic signal having an anodized aluminum heat radiator that is mounted directly on the upper edge of the traffic signal. The advantages attributed to this device include the lack of a need for a hydrophilic surface coating, a heat retaining layer on the rear of the signal, or an artificial energy supply. Japanese Patent Laid-open Publication No. 7-3731 assigned to Technonijuichi K.K. describes a road sign, reflective, anti-rust, which has a heat storage container tightly attached to its rear side. The heat storage vessel contains a heat storage agent, typically a gel containing a liquid glycol that collects heat and radiates this heat to the front surface of the signal. The U.S. Patent No. 5,087,508 to Bec discloses a retroreflective traffic signal having a thermal deposit layer located below the retroreflective surface. The thermal deposit contains a material that undergoes a phase change between -20 ° C and 40 ° C. The energy barrier of the phase transition prevents or prevents the signal from cooling rapidly. Japanese Patent Application No. 0614961A assigned to Kawai Musical Instrument Mfg. Co., describes an anti-fog mirror in which a vibration generator is fixed to the rear surface of a mirror. Japanese Patent Application 07259024A assigned to Matsushita Denki Sangyo KK, discloses an anti-fog mirror to provide road safety, in which solar energy is stored in a heating unit located below the surface of the mirror. Another method that has been used to impart antirewire characteristics to retroreflective traffic signals is to apply a hydrophilic coating, to disperse the water, to the surface of the signal. The hydrophilic coating disperses moisture on the surface of the signal and therefore makes the signal easier to read because the resulting thin water layer does not alter the path of the incident and retroreflective light to a greater degree. The U.S. Patents Nos. 5,073,404, 4,844,976 and 4,755,425 of T. Huang describe a retroreflective coating having a clear coating comprising colloidal silica and a polymer selected from aliphatic polyurethanes, polyvinyl chloride copolymers and acrylic polymers. The colloidal silica is placed in the polymer at about 10-80% by weight (10-70% by weight in the case of polyacrylates). Transparent coatings provide superior spray repellency, allowing the retroreflective coating to retain a higher percentage of its original brilliance after it is exposed to moisture. There are numerous examples of water dispersion layers, anti-rust, which are made with inorganic colloidal particles placed in a polymeric binder. The U.S. Patent No. 4,576,864 to Krautter et al, discloses a water dispersion layer which is composed of colloidal particles of a metal or silicon oxide in which the water dispersion layer is adhered to a plastic substrate by an adhesive comprising a polymer containing a polar group, not soluble in water, soluble in an organic solvent, and essentially non-inflatable. The U.S. Patent No. 4,478,909 to Taniguchi et al, discloses an anti-fog coating having finely divided silica particles placed in a polyvinyl alcohol matrix and an organosilicon alkoxy compound or hydrolysates thereof. A similar coating is also described in U.S. Pat. No. 5,134,021 of Hosono et al. In the area of pavement marker technology, it is already known to attach a flat glass plate to a retroreflective facing surface to improve the abrasion resistance. The U.S. Patents Nos. 4,232,979, 4,340,319 and 4,596,622 to Heenan et al, describe road pavement markers having a glass sheet fixed to a front face of the retroreflective skin. The glass is preferred to be an untempered and untempered sheet of about 0.00508-0.0381 cm (2-15 mils). There is a particular need to improve the abrasion resistance of pavement markers since they must be able to withstand the impacts of tires in the presence of abrasive materials such as sandstone and sand, as well as chemicals the road and the temperature and extreme environmental conditions. However, unlike pavement markers, traffic signs are not placed on road surfaces, and, as a consequence, extreme resistance to marker abrasion is not required. of the pavement. For traffic signals, the loss of intensity caused by precipitation, especially dew, is of great interest.

Brief Description of the Invention The present invention provides a retroreflective anti-rust signal comprising a glass píate having a textured outer surface positioned on a retroreflective graphic. The textured glass surface is exposed to air, and, under dew conditions, the precipitation is dispersed in a thin film on the surface of the glass plate. The present invention also provides a method for manufacturing an anti-flash anti-reflective signal in which a glass plate having a textured outer surface is placed on the retroreflective graphic. The present invention provides an economical and elegantly simple method of manufacturing a retroreflective anti-cloud traffic signal. The anti-robbery characteristics of the inventive retroreflective traffic signal are achieved without the need for electrical inputs, heating elements, heat storage layers, infrared light radiators, phase transition materials or vibration generators. Other advantages provided by the textured glass surface include: resistance to organic solvents, thus facilitating the removal of graphite from the signal; resistance to environmental conditions; and protection from ultraviolet (UV) light, thus extending the lifetime of the underlying polymers and inks. These and other features of the present invention are more fully illustrated and described in the drawings and the detailed description of this invention, where like reference numerals are used to represent similar parts. It is to be understood, however, that the description and drawings are for illustration purposes and should not be read in a manner that could unduly limit the scope of this invention.

Brief Description of the Drawings Figure 1 is a front view of a retroreflective signal of the present invention in which the retroreflective graph is "St. Paul 10 km". Figure 2 is a cross-sectional view along line 2-2 of Figure 1. Figure 3 is a graph of light intensity versus day time, from the retroreflective coating having a surface of flat glass. Figure 4 is a luminous intensity measured against the time of day from the retroreflective sheets having a textured glass surface. Figure 5 is a SEM photomicrograph of the surface of a flat glass plate. Figure 6 is a SEM photomicrograph of the surface of a textured glass plate.

Figure 7 is a SEM photomicrograph of the surface of a highly textured glass plate.

Detailed description of the invention In Figure 1, a retroreflective signal 2 of the present invention is shown, which contains information in the form of a retroreflective graph 3. In this case, the retroreflective graph is in the form of a sentence that reads "St. Paul 10 km. " In Figure 2, the retroreflective graph 3 is placed on the substrate 4. An interlayer 5 is superimposed on the retroreflective graph 3. At the top of the signal, the outer layer lies on a glass sheet 6 having a surface of main glass 7 which is facing towards the substrate and a second surface of main textured glass 8 which is exposed to the atmosphere. The retroreflective graphics of the present invention are defined as a retroreflective coating or retroreflective elements arranged or distributed in the form of characters, numbers or symbols. The retroreflective graphics do not include a uniform retroreflective coating or the layer on the entire surface. Accordingly, the graphics are not only planar reflectors such as a pavement marker; however, retroreflective graphics can be placed on a uniform retroreflective background. The retroreflective graphics may also be of an inverse design such as a retroreflective background for the characters, retroreflective numbers or symbols such as a non-reflective profile of a cow or a deer. In the latter case, the retroreflective graph could include both the retroreflective background and the non-reflexive profile. The retroreflective graphics 3 are typically attached to the substrate 4 or to a background material by an adhesive or by mechanical means such as anodized aluminum rivets. Adhesives are preferred, and pressure sensitive adhesives are especially preferred. The retroreflective characters, numbers or symbols can be attached to a retroreflective background. For example, the retroreflective characters, numbers or symbols may be cut out of the white retroreflective liner and attached to a retroreflective backing layer that has been superimposed with a clear, colored polymeric film, such as an acrylic film. The common background colors are green, coffee and blue. Another way to manufacture the retroreflective graphic is to cut the letters, numbers or symbols of a transparent colored polymer film, and to laminate colored letters, numbers or symbols, on the white retroreflective coating. A clear, commercially available clear colored acrylic film, is Scotchlite® Electronic Cuttable Film Series 1170, available from 3M, St. Paul, MN. In still another alternative, the retroreflective graph can be produced by printing it on the portions of a retroreflective sheet. For example, a stop sign graphic can be made by stenciling a clear red ink with a negative legend on a white retroreflective coating. Retroreflective graphics typically contain a retroreflective coating. Examples of the commercially available retroreflective coating that can be used to make the graph include Scotchlite® Reflective Sheeting High Intensity Grade Series 3870, Scotchlite® Reflective Sheeting Diamond Grade VIP Series 3990, and Scotchlite® Reflective Sheeting Diamond Grade LDP Series 3970, available from 3M, St. Paul, Minnesota. The retroreflective coating typically comprises a reflective surface and optical elements. The reflective surface serves to reflect the incident light, and the optical elements serve to redirect the incident light towards the light source. The reflective material may comprise a specular metal reflector such as aluminum or silver (see, for example, US Patent No. 5,283,101) or a diffuser reflector such as a heavy metallic pigment or a polymeric material wherein the reflectance is caused by a difference in the refractive indexes in an interface (often an air-plastic interface). Optical elements typically come in one of two forms: lens elements in the form of a globule and cube corner elements. Examples of the retroreflective coating employing the elements of lenses in the form of a globule have been described in U.S. Pat. Nos. 2,407,680, 3,190,178, 4,025,159, 4,265,938, 4,664, 966, 4, -682,852, 4,767,659, 4,895,428, 4,896,943, 4,897,136, 4,983,436, 5,064,272 and 5,066,099. Examples of retroreflective coatings employing cube corner elements have been described in U.S. Pat. Nos. 3,684,348, 4,618,518, 4,801,193, 4,895,428, 4,938,563, 5,264,063 and 5,272,562. The descriptions of the patents cited in this paragraph are incorporated herein in their entirety for reference. The substrate 4 is typically a metal, wood or polymeric material. Preferably, the substrate is a rigid material, with aluminum being the most common. The substrate can also be a flexible polymeric material or a combination in which a flexible polymeric material is mounted on a rigid material such as aluminum or plywood. The substrate is usually preferred to be opaque. Typical examples of commercially available substrates include: a degreased aluminum panel etched with 2mm (millimeters) thick acid, a plywood of 2 cm (centimeters) in thickness, of high density, or a plastic panel reinforced with fiberglass of 4 mm thickness; All of these substrates are commonly used in the traffic signal industries and are available from the Lyle Sign Company, Eden Prairie, MN. In some embodiments, the retroreflective signals of the present invention can be produced without a substrate. In this case, the retroreflective signal could be comprised of a textured glass sheet attached to the retroreflective graphic. In one embodiment, the glass sheet is fixed to the retroreflective graphic by a clear adhesive. In another embodiment, a clear, pressure sensitive adhesive with a releasable coating is attached to the back of the retroreflective graphic. The releasable coatings are typically sheets of a non-tacky polymer such as a fluoropolymer or a polyethylene treated with silicone, polypropylene, polyethylene terephthalate, etc. For additional strength and stiffness, the retroreflective signal may subsequently be mounted on a rigid substrate. Alternatively, the retroreflective graphic and the textured glass plate (with or without an adhesive layer) may be mounted on a frame or structure. The retroreflective signal of the present invention further contains an interlayer 5 on the retroreflective graphics. In general, the interlayer can be any layer that can transmit light. In a preferred embodiment described above, the interlayer comprises an adhesive that joins the retroreflective graph and the glass plate. In another preferred embodiment, the interlayer comprises a gap or air gap. The interlayer may also comprise a polymeric material. A preferred polymeric material is poly. { methyl methacrylate). Other suitable polymers include: aliphatic polyurethane, (meth) acrylic acid and ethylene copolymers, or a flexible polyvinyl chloride. The polymeric material may also be a copolymer, a polymer blend, or a multilayer film. The polymeric material is preferably transparent and will transmit more than 80% of the incident visible light; more preferably more than 90%. For additional stability, the polymeric material may contain UV absorbers and scavengers or free radical scavengers. Common examples of such additives include hindered amines, benzophenones, benzotriazoles, oxanilides and aryl benzoates. Examples of the commercially available hindered amines include Chimassorb (TM) 944, Tinuvin (TM) 144, 622, and 770 available from Ciba-Geigy Corp., Hawthorne, New York. Common examples of UV absorbers are benzotriazolies, such as Tinuvin (TM) 327, 328, 1130, or P, available from Cíba-Geígy Corp., Hawthorne, New York; oxanilides, such as Sanduvor (TM) EPU or VSU, available from Sandoz Chemicals Corp., Charlotte, North Carolina, and aryl benzoates, such as UV-Chek AM-340, available from Ferro Corp., Cleveland, Ohio. The polymeric layer may also contain coloring agents or fluorescent compounds to make various colored retroreflective coatings such as yellow, orange, brown, green, blue, fluorescent orange or greenish yellow. The polymeric layer is preferably approximately 0.05 to 2.5 mm thick. The glass plate 6 is a glass based on silica, preferably a glass of lime-soda. The glass plate can not be an organic polymeric material. It has been found that organic polymeric materials (with or without textured surfaces), such as poly (methyl methacrylate), do not provide the full range of desirable characteristics including anti-glare properties, durability, resistance to environmental conditions (e.g. resistance to microbes), resistance to organic solvents, etc., which are provided by the textured glass plates of the present invention. The glass plate is light transmitting, and is preferably capable of transmitting at least 80%, more preferably 90%, of the intensity of the visible light incident perpendicular to the glass plate. The thickness of the glass plate is preferably 0.1 to 10 mm; more preferably from 0.5 to 6 mm; and still more preferably from 1 to 4 mm. The glass plate has two main surfaces. In the retroreflective signal of the present invention, the external main surface of the glass plate is exposed to air. The outer surface is a textured glass surface having microscopic surface variations of at least about 3 nm. { nanometers). The textured surfaces are preferably defined as containing micropores having diameters in the size range of between about 0.003 to 10 μm (microns), more preferably between about 0.005 to 1 μm, still more preferably between about 0.01 to 0.5 μm, and still more preferably between about 0.01 and 0.05 μm.

The surface micropores can be better understood with reference to Figures 5-7 which show scanning electron microscope (SEM) micrographs of three different glass surfaces. Figure 5 shows a flat, non-textured glass surface, which appears uncharacterized under the SEM analysis. Figure 6 shows a textured glass surface with micropores having diameters in the size range of about 10 to 60 nm (the size scale is shown in the lower right hand corner of each photomicrograph). Figure 7 shows a more highly textured glass surface; the surface of this plate appears tarnished when viewed with the naked eye. The texturing can be either set or random, but preferably it is random (ie, without a regular configuration). In a preferred embodiment, the textured glass has the characteristics of shell shells, islands and micropores described in U.S. Pat. No. 4,944,986, incorporated herein by reference. Shell shells are generally in the range of 100 to 2,000 μm. The islands are in the range of 10 to 120 μm. These shell and island shells tend to diffuse the visible light from the entrance. To provide greater clarity, glass etched with acid must have a smaller amount of shell shells and islands, but more of the microporous surface texture. In a preferred embodiment, the textured glass plate is made of AR glass sold by Zuel Company, St. Paul, Minnesota. The textured glass surface can alternatively be defined by its water dispersion properties. Accordingly, in a preferred embodiment, the static contact angle of the deionized stationary water droplets on the textured glass surface at 25 ° C remains below 40 °, more preferably less than 30 °, and still more preferably less than 20 °. °. The static contact angles can be measured on a 0.01 ml deionized water droplet with a contact angle goniometer. At least the main surface 8 of the glass plate must be textured. The glass plate can be textured either before or after it is fixed to the signal. The glass surface can be textured by physical means such as polishing or by sand blasting or by chemical means. Preferably, the glass is etched with an acid, typically hydrofluoric acid. In a particularly preferred embodiment, the glass is etched with an aqueous solution of hydrofluoric acid, ammonium bifluoride and a water-soluble organic compound such as sorbitol. The internal main surface of the glass 7 can be either smooth or textured. In a preferred embodiment, the inner surface is also textured to reduce cost or to improve transparency. The retroreflective signals of the invention may also include adhesive layers. The adhesive can be used to join any of the layers in the signal. For example, an adhesive layer can be placed on the second main glass surface; thus joining the glass plate to the retroreflective graphic. The adhesive layer or layers may be continuous or non-continuous. The non-continuous layer or layers provide a gap or air space between the layers. In some embodiments, the main glass surface 7 is coated with a silane prior to contacting the adhesive (see U.S. Patent No. 4,596,622, incorporated herein by reference). An adhesive layer can also be placed on the external surface of the substrate (i.e., the surface of the main substrate turned outward from the graphic). In cases where the adhesive is placed on the external surface of the substrate, the substrate is preferably a flexible polymer sheet. In some preferred embodiments, an adhesive may be placed on the back of the retroreflective graphic or on the external surface of the substrate and covered with a release coating made of a polymeric material such as silicone-treated polyethylene. The types of adhesives usable in retroreflective signs include, but are not limited to, adhesives that melt with heat and pressure sensitive adhesives. Foam adhesives are especially advantageous in those embodiments in which an adhesive is used to bond the retroreflective graphic to the substrate, since foam adhesives are likely to be more durable. The adhesives described in U.S. Pat. Nos. 4,906,523 and 5,264,063 can be used, and are incorporated herein for reference. In addition, or instead of the adhesives, the signals can use mechanical means to fix the glass plate to the signals. Examples of suitable mechanical means include: clamps or securing devices on the edges of the signal; a frame or structure, preferably a heavy-duty aluminum frame or structure; or screws through the glass plate. Additionally, gaskets or a silicone sealant can be used around the edges of the signal to prevent moisture or contaminants from entering any of the signal layers. In its finished state, the retroreflective signal must retroreflect the light efficiently. Accordingly, using the method ASTM E810-94 described in the Examples section, the retroreflective signals of the present invention are preferably retroreflected at least 50%, more preferably at least 70%, and more preferably at least 90% of the incident light when it is compared to the retroreflective coating without a glass cover plate.

EXAMPLES The following non-limiting examples have been selected to illustrate the invention. In a comparative test of the spray-resistant properties, several plastic or glass cover plates were mounted on identical sheets of a retroreflective coating (ScotchliteR Reflective Sheeting Diamond Grade - Visual Impact Performance, Yellow 3991, available from 3M, St. Paul, Minnesota) which was laminated on an aluminum panel by means of a pressure sensitive adhesive. The glass plates were held in place by lower plywood assemblies (61 (L) x 3.8 (H) x 1.6 () cm) having two parallel notches (61 cm long x 1.3 cm deep x 0.4 cm wide) ) separated by 0.62 cm. The surrounding edges were sealed with a conformable plastic tape to prevent moisture from condensing on the interior surfaces. The glass-covered coatings were tested to verify spray resistance by collateral placement on an open platform on a fall night in St. Paul, Minnesota. The intensity of the retroreflected light having an entry angle of approximately 5 ° from the main axis perpendicular to the test panel was measured using a retro-luminometer (model 1980A, Spectra Pritchard) at an angle of approximately 0.2 ° off the source luminous (that is, at an observation angle of 0.2 °). The light source was a 500 watt flood lamp. Each retroreflection of the test signal was measured in a 10 minute interval from 6 p.m. until 6 a.m. the next day. The retroreflective data were then calculated with respect to the standard candelas / lux / m2 unit by a calibration factor, which was obtained according to the method recommended in ASTM E810-94, from the retroreflected light measured by the photoluminometer without any condensation on the test panel. Figure 3 shows the measurement of retroreflected light intensity from the coating with a flat glass cover plate. The flat glass plate was 2.4 mm (95 thousandths of an inch) thick, obtained from the AFG Industries, Kingsport, Tennessee (average visible light transmittance 91%). The initial intensity of the retroreflected light was approximately 430 candelas per square meter of lux (cd / lux / m2). Approximately at 8:30 p.m. the dew formation began to decrease the intensity of the retroreflected light from the coating and at 10:00 pm, the intensity of the retroreflected light gradually increased until it reached an intensity of approximately 350 cd / lux / m2 at the 3:00 a.m. Figure 4 shows the measurement of retroreflected light intensity from the coating with a textured glass cover plate. The textured glass was 2.4 mm (95 thousandths of an inch) thick, which is a textured glass obtained from Zuel Company, St. Paul, Minnesota identified as AR glass). At approximately 8:30 PM, the formation of the dew began to decrease the intensity of the retroreflected light from the coating and by 10:00 p.m. the intensity of the retroreflected light decreased to approximately 200 cd / lux / m2. As shown in Figure 4, the retroreflected light intensity was then increased, and by approximately 12:30 a.m., the retroreflected light has regained its initial intensity.

At the same time, tests were carried out with the cover plates of: coarsely textured (ie, matt finished) glass (obtained from Zuel Company,? T., Paul, Minnesota, identified as RR glass); textured poly (methyl methacrylate); and without cover plate. The matte glass cover plate showed a general reduction in intensity (up to approximately 330 cd / lux / m2.) Due to the matte finish, but showed excellent anti-rust properties that were very similar to the textured glass described above in Figure 4. Retroreflective coating without a cover plate or textured poly (methacrylate methacrylate) cover plate, both showed a loss of intensity up to approximately 50 cd / lux / m2 and remained at approximately 50 cd / lux / m2 until 6:00 a.m. Retroreflectivity tests were also carried out under dry conditions with several cover plates measured at various viewing angles from a light having an entry angle of -4.0 °. The measurements were carried out in accordance with ASTM E810-94. The retroreflective coating was Scotchlite® Reflective Sheeting Diamond Grade LDP No. 3970. The glass cover plates were deposited on the coating, and the coating with the plate was retained by a frame or structure.

No adhesive was used. The results of these measurements are shown in Table 1.

Table 1: Intensity of the Retroreflected Light (cd / lux / m2) against the Observation Angle (degrees) As can be seen in Table 1, the r plates of both textured glass and flat glass are acceptable in terms of retroreflected light intensity. Flat glass r plates, however, do not work as well as texturized glass plates because retroreflectivity declines appreciably under spray conditions (see, for example, Figure 3). The matte-finished glass plate (ie, textured RR glass) is acceptable for use on retroreflective traffic signals because of its good anti-flash properties. However, it is less desirable than a textured glass less coarsely because of its reduced retroreflective intensity (see Table 1). As described above, the flat glass and textured glass surfaces were analyzed by SEM. The flat glass samples of the AFC industries; the textured AR glass of the Zuel Company and the textured RR glass of the Zuel Company were steam coated with a thin layer of platinum (less than 3.5 nm) by conventional techniques. The samples were then analyzed at a magnification of 100,000X using an Electronic Scanning Microscope with Field Emission Model S-4500. The resulting SEM photomicrographs are shown in Figures 5, 6 and 7 (flat glass, textured AR glass and textured RR glass, respectively).

Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and scope of this invention. For example, the retroreflective signals of the present invention can be made with or without a polymer interlayer or can include additional layers such as adhesive layers between the graphic and the substrate or between the graphic and the glass. Therefore it should be understood that this invention is not unduly limited to the illustrative embodiments described above, but that it will be controlled by the limitations described in the claims and the equivalents thereof.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following

Claims (12)

1. A retroreflective anti-glare signal, characterized in that it comprises: a retroreflective graph and a glass plate having a main surface placed on a retroreflective graph, wherein the main surface is exposed to the atmosphere and is turned away from the retroreflective graph; and wherein also the main glass surface exposed to the atmosphere is a textured glass surface.

2. A retroreflective antiroll signal according to claim 1, characterized in that it also comprises a substrate placed under the retroreflective graph.

3. A retroreflective anti-glare signal according to claim 2, characterized in that the substrate is a glass plate of 0.5 to 6 mm thick, and where mechanical means are used to fix the glass plate to the retroreflective graph.

4. A retroreflective anti-glare signal according to claims 1-3, characterized in that a moisture resistant seal comprising an elastic gasket or silicone sealant is placed around the edges of the signal to prevent moisture from condensing between the retroreflective graphic and the glass plate.

5. A retroreflective anti-glare signal according to claims 1-4, characterized in that a layer is placed between the retroreflective graphic and the glass plate; and wherein the interlayer comprises at least one substance selected from the group consisting of air, an adhesive, and an organic polymer.

6. A retroreflective anti-glare signal according to claims 1-5, characterized in that the retroreflective graphic comprises a retroreflective coating in the form of letters, numbers or symbols attached by means of an adhesive to a retroreflective bottom sheet having a polymeric, colored layer , clear.

7. A retroreflective anti-glare signal according to claims 1-5, characterized in that the retroreflective graphic comprises a retroreflective sheet having an imprint thereon to produce contrast regions in such a way that the signal exhibits letters, numbers or symbols.

8. A retroreflective anti-glare signal according to claims 1-7, characterized in that the textured glass surface comprises micropores having diameters in the range of 0.005 to 1 μm.

9. A retroreflective anti-glare signal according to claims 1-8, characterized in that the textured glass surface comprises micropores having diameters in the range of 0.01 to 0.5 μm.

10. A retroreflective anti-glare signal according to claims 1-9, characterized in that the textured glass surface is dispersing the water in such a way that a droplet of deionized water of 0.01 ml on the textured glass surface has a contact angle less than 30 ° at room temperature.

11. A retroreflective anti-glare signal according to claims 1-10, characterized in that the glass plate comprises soda-lime glass.

12. A method for manufacturing a retroreflective anti-glare signal, characterized in that it comprises: placing a glass plate on a retroreflective graph in which the glass plate has a first main glass surface facing the retroreflective graph and a second main glass surface facing the retroreflective graph. side away from the retroreflective graph, wherein the second main glass surface is a textured glass surface.