DE202021100222U1 - Composite pane with sun visor protection area with improved heat protection function - Google Patents

Abstract

Composite pane (100) with sun visor protection area (10), comprising an outer pane (1) with an outer surface (I) and an inner surface (II), an inner pane (2) with an outer surface (III) and an inner surface (IV) and a thermoplastic intermediate layer (3) which connects the surface (II) on the inside with the outside surface (III), characterized in that the intermediate layer (3) comprises at least one thermoplastic film (4) which is a ribbon (5) for forming the sun visor protection -Area (10) and between the outer pane (1) of the inner pane (2), exclusively within the sun visor protection area (10), an IR-radiation-reflecting film (6) is arranged.

Description

The invention relates to a composite pane with a sun visor protection area with an improved heat protection function.

In the automotive sector, in particular for the production of windshields, foils are often used which have a so-called colored band in the upper area as a sun visor. For this purpose, for example, the upper part of such a film can be coextruded with a correspondingly colored polymer melt. In the production of partially colored transparent films, such as those used as intermediate films for safety glass for motor vehicles, a precisely defined and dimensioned transition region from a colorless part to a colored part with a continuous transition in color intensity is required. This is achieved, for example, with a ribbon that has a wedge-shaped profile at the end of the ribbon. Processes for the production of foils with color ribbon suitable for the automotive sector are for example in the US 3715420 , USD3799718 and the US4562023 described.

There is an increasing need for composite panes, in particular for vehicle panes, which, in addition to the sun visor protection by means of a colored band, also have or enable further functionalities. These include, for example, improved sound insulation, which can be achieved through the use of so-called acoustic foils in the composite panes, and the provision of suitability for a HUD (head-up display) function, for example through the use of wedge foils. What is particularly desirable is an improved heat protection function to increase the thermal comfort in the vehicle interior. For example, it is from the WO 19970033763 and the US 5932329 known to introduce films reflecting IR rays over the entire surface of the composite panes. The IR-reflecting films reflect portions of the incident solar radiation, especially in the infrared spectral range, which reduces the heating of the vehicle interior due to direct solar radiation. Such IR-reflective films are usually expensive.

Panoramic windows, in particular panoramic windshields, which are lengthened in the direction of the roof compared to normal standard windshields and allow a wider view for vehicle occupants, are becoming increasingly popular in vehicle construction. Such panorama panes are designed to be comparatively large due to the extended pane and field of vision. Often, vehicles with panoramic windows also have a dark-tinted roof window, which is then installed close to the panoramic windshield. In order to produce an attractive overall aesthetic impression, it is then desirable to adapt the color of the color band of the panoramic panes in the adjacent area to the usually dark to very dark color of the roof pane. The color band for providing the sun visor protection is often wider in panoramic windows, for example> 20 cm, than in conventional windshields. Nevertheless, such panoramic panes must also meet the strict requirements for safety glass in motor vehicles, such as transparency in the driver's central field of vision. Windshields have a central field of vision, the optical quality of which is very demanding. The central field of view must have a high light transmission (typically greater than 70%). Films with a broadened color band, which are suitable for the production of such panoramic windshields, are commercially available and are, for example, from the company Sekisui Chemical Co., Ltd. produced. The combination with further functionalities is also desired for panorama windshields, but in particular the provision of a satisfactorily improved heat protection function while maintaining the quality and the fulfillment of all other strict requirements in vehicle construction, especially for windshields due to the size of such panorama windows, is expensive and especially in combination complex to manufacture with other desired functions.

One object of the invention is to provide a composite pane with a sun visor protection area with an improved heat protection function, which can be produced simply and more economically, in particular in an embodiment as a panoramic windshield. Furthermore, in addition to improved thermal comfort, it should be possible to combine the composite pane with other functions in a simple manner.

According to the invention, these and other objects are achieved by a composite pane according to independent claim 1. Advantageous refinements of the invention emerge from the subclaims.

According to the invention, a composite pane with a sun visor protection area is provided comprising an outer pane with an outer surface I. and an inner surface II , an inner pane with an outer surface III and an inner surface IV and a thermoplastic intermediate layer forming the interior surface II of the Outer pane with the outside surface III connecting the inner pane, the intermediate layer comprises at least one thermoplastic film which has a color band to form the sun visor protection area and an IR-reflecting film is arranged between the outer pane and the inner pane, exclusively within the sun visor protection area.

In other words, the invention provides that the functional IR radiation-reflecting film is not arranged over the entire surface, but only in the upper, colored area, namely in the sun visor protection area of the composite pane. The further part of the intermediate layer in the composite pane that is not colored for glare protection remains free of the functional film additionally introduced according to the invention. The IR radiation-reflecting film used is therefore advantageously dimensioned significantly smaller than previously when it was used essentially over the entire surface. According to the invention, when viewed from above, the sun visor protection area of the composite pane has the geometric dimensions of the color band in the intermediate layer. Advantageously, the thermal shielding can be significantly improved and a satisfactory thermal comfort can be provided with significantly reduced production costs for the laminated pane through the exclusive introduction of the IR-radiation-reflecting film exclusively in the limited sun visor protection area, in particular in the case of panoramic windows.

According to the invention, the IR radiation-reflecting film has at most the geometric dimensions of the sun visor protection area in plan view, but the film is preferably designed to be smaller, so that an area preferably remains free all around. This has the advantage that the functional IR-reflecting films in the composite pane are protected from environmental influences.

In an embodiment as a windshield, the upper edge and the sides of the functional film facing the A-pillar can advantageously be covered by a conventional covering print. The lower edge of the functional film, directed towards the field of vision of the windshield, can be set back behind the end of the ribbon and thereby be covered. Both contribute to an improved, visually more appealing overall impression of the composite pane.

The composite pane according to the invention is intended to separate the interior of a vehicle from the external environment in a window opening. The composite pane is a laminate and comprises a first and a second pane, in particular a glass pane, which in the context of the invention are referred to as an outer pane and an inner pane and are connected to one another via a thermoplastic intermediate layer. In the context of the invention, the inner pane is the pane facing the interior space in the installed position. Outer pane is the term used to describe the pane facing the external environment in the installed position. In the context of the invention, the surface on the interior side (or inside or inside surface) is understood to mean that surface of the panes which, in the installed position, faces the interior. For the purposes of the invention, the outside surface (or outside or outside surface) is understood to mean that surface of the panes which, in the installed position, faces the external environment. Designations with "top" and "bottom" also refer to the position in the installation position.

The surfaces of the panes are typically referred to as follows: The outside of the outer pane is called the side I. designated. The inside of the outside pane is called the side II designated. The outside of the inside pane is called the side III designated. The inside of the inner pane is called the side IV designated.

The outer pane and the inner pane are preferably formed independently of one another from glass or plastic, preferably soda-lime glass, alkali aluminosilicate glass, float glass, polycarbonate or polymethyl methacrylate. In a particularly preferred embodiment, the outer pane and the inner pane are made of glass.

Suitable panes of glass include panes of glass known under the trade names Planiclear and Planilux (each clear glass), or TSANx, TSA3 +, TSA4 + from Saint-Gobain, the glasses of the TSA series being green-colored glasses.

The outer and / or inner pane preferably has a thickness of 0.1 to 4 mm, preferably 1 to 4 mm, particularly preferably 1.6 mm to approximately 2.1 mm, independently of one another.

The interior surface of the outer pane and the outer surface of the inner pane face one another and are connected to one another by means of the thermoplastic intermediate layer. According to the invention, the thermoplastic intermediate layer comprises at least one thermoplastic film which has a Has ribbon to form the sun visor protection area. This means that the intermediate layer was formed from such a thermoplastic film.

According to the invention, the thermoplastic intermediate layer can be formed by a single thermoplastic film in which the tinted or colored ribbon is produced by local tinting or dyeing. Such films are obtainable and available, for example, by coextrusion. Alternatively, but less preferred according to the invention, a colored film section for the color ribbon and an undyed film section can be combined to form the thermoplastic layer. The color ribbon can be colored or tinted homogeneously and thus have a location-independent transmission. The tint or coloration can, however, also be inhomogeneous, in particular a transmission profile can be implemented. The intermediate layer can, however, also be formed from a plurality of thermoplastic films, one film correspondingly having a color band.

In a preferred embodiment it is provided that the color ribbon in the thermoplastic film is designed with a wedge-shaped cross section to form the sun visor protection area. This means that at least the end of the color ribbon continuously decreases in thickness downwards (in the vehicle towards the engine edge) in cross section. As a result, the degree of transmission in the tinted or colored area increases, at least in this end section, with increasing distance from the upper edge (roof edge in a motor vehicle). In this way, sharp edges of the colored area can be avoided, so that the transition from the sun visor protection area to the transparent area of the composite pane, for example a windshield according to the invention, runs gradually, which looks more aesthetically pleasing.

In one embodiment it is provided that the IR radiation-reflecting film is incorporated into the thermoplastic intermediate layer. In other words, the IR radiation-reflecting film in the composite pane is completely enclosed by the thermoplastic polymer of the thermoplastic films. This can be achieved, for example, by positioning the IR-radiation-reflecting film between at least two thermoplastic polymer films at a location suitable and provided according to the invention during the production of the composite pane and then fusing the polymer films with one another through the action of heat, for example during lamination the IR-reflecting film is surrounded by the thermoplastic material of the foils and, as it were, enclosed. The film reflecting IR rays is thus securely fixed in the appropriate position within the sun visor protection area of the composite pane, and the functional film is also protected from environmental influences as a result.

In an alternative embodiment of the invention, the IR radiation-reflecting film is a functional coating that is applied to the inner surface ( II ) the outer pane and / or the outer surface ( III ) the inner pane is arranged.

Suitable IR-reflecting films are known in principle and, for example, also in WO 19970033763 and the US 5932329 , WO2013 / 104439 , DE19927683 C1 and WO2017 / 155849 described. Such functional films comprise, for example, one or more thin transparent metallic layers which are embedded between dielectric layers. Silver has established itself as a preferred metal for the metallic layer because it has a relatively neutral color effect and also selectively reflects infrared radiation outside the visible range of solar radiation. The task of the dielectric layers is to protect the functional layer from oxidation via their refractive indices. Such sun protection layers, which can be produced, for example, using the reactive sputtering method, are used to a large extent in glazing for buildings, but also in motor vehicles. In most cases, layer systems with two silver functional layers, but also with three or four silver functional layers, are used because their efficiency, ie the reflection of the infrared radiation outside the visible range in relation to the transmission of the visible radiation, is greater.

As an alternative to the inorganic, in particular silver-based coatings, the IR radiation-reflecting film can also be formed on a non-metallic, organic basis. In this case, the functional film is preferably a coating composed of a stack of several, typically several hundreds, organic layers with different or alternating refractive indices. The stack is a birefringent dielectric interference stack that reflects IR radiation due to interference effects. Such organic coatings have the advantage over metallic coatings of higher color neutrality and higher light transmission. In addition, they do not interfere with the transmission of electromagnetic signals. Such sun protection coatings on PET carrier films are provided, for example, by the 3M company under the brand name “Ultra-Clear Solar Film”.

According to the invention, the thermoplastic films are preferably designed as thermoplastic polymer films which contain polyvinyl butyral (PVB), ethylene vinyl acetate (EVA) or polyurethane, and / or mixtures and / or copolymers thereof. Polyvinyl butyral is particularly preferred. The thermoplastic films according to the invention are preferably formed on the basis of the materials mentioned, but can contain further constituents, for example plasticizers. The polymer film types mentioned are particularly suitable for the automotive sector and are commercially available

Individual polymer films, in particular PVB films, which are preferably used over the entire surface, preferably have a thickness of approximately 0.2 mm to 1 mm, for example 0.38 mm, 0.76 mm or 0.81 mm. Further properties of the laminated glass pane can be influenced via the thickness of the foils. For example, thicker PVB films improve sound insulation, especially if they contain an acoustically effective core, but also increased burglary resistance and increased protection against ultraviolet radiation (UV protection).

One or more thermoplastic polymer films can, however, especially if they are only used above the IR-radiation-reflecting film to cover, store and secure it as an adhesive layer to the outer pane or the inner pane within the intermediate layer, very thin, preferably with thicknesses between 0, 01 mm to 0.08 mm, preferably between 0.01 mm and 0.05 mm, for example with a thickness of 0.025 mm. As an alternative to such a thin thermoplastic film, other suitable transparent clear adhesive layers (OCA: optically, clear adhesives) can be used for covering and fixing the IR-reflective film, for example on the inside of the outer pane.

In another preferred embodiment, the TTS value in the sun visor protection area of the laminated pane is <35%, measured in accordance with ISO 13837 conv. A calculated. The TTS value is a measure of the total heat radiation transmitted by the sun through the pane, according to the invention in the area of the sun visor protection area.

An embodiment of the composite pane according to the invention as a panoramic pane provides that the sun visor protection area has a width of> 30 cm, for example 45 cm or 50 cm. According to the invention, the width means in this case the dimension of the sun visor protection area starting from the roof edge in the direction of the engine edge of a windshield. As a result of the comparatively wide sun protection area, as is particularly desirable and provided for panoramic windows, a significant improvement in thermal comfort can be achieved by the heat-shielding IR radiation-reflecting film provided within the sun protection area.

In an embodiment of the composite pane according to the invention with a sun visor protection area, the thermoplastic film or the intermediate layer is designed with a wedge-shaped thickness profile. This gives the composite pane according to the invention a wedge-shaped thickness profile overall and can advantageously be used in motor vehicle windshields for HUD displays. The fundamental problem with HUDs is that the projector image is reflected on both surfaces of the windshield. As a result, the driver not only perceives the desired main image, but also a slightly offset, usually lower-intensity secondary image. The latter is also commonly referred to as ghosting. This problem is solved according to the invention by the wedge-shaped design of the thermoplastic film, so that the reflective surfaces are arranged at an appropriately chosen angle to one another, so that the main image and ghost image are superimposed, so that the ghost image is no longer noticeable. In the case of conventional laminated glasses for head-up displays, the wedge angle is typically around 0.5 mrad. In addition to improving thermal comfort, it can also be used in combination to provide the HUD function.

In another embodiment of the composite pane according to the invention with a sun visor protection area, the thermoplastic film is an acoustic thermoplastic film, for example an acoustic PVB film. This is understood to mean a film that provides a noise-reducing, sound-absorbing effect. Such an effect can be achieved, for example, by a multi-layer, for example three-layer film, which has an inner layer with a higher plasticity or elasticity than the outer layers of the thermoplastic film surrounding it. This can be achieved, for example, by the fact that the inner layer contains a higher proportion of plasticizers. In other words, in this embodiment according to the invention, the composite pane not only has sun protection from the colored tape and improved heat protection from the IR-reflecting film in the sun protection area, but also advantageously combines these functions with sound insulation.

The functions mentioned above can also be designed in combination with one another and also with other customary functions.

All standards mentioned refer to the version valid on the filing date.

The various embodiments of the invention can be implemented individually or in any combination. In particular, the features mentioned above and to be explained below can be used not only in the specified combinations but also in other combinations or on their own without departing from the scope of the invention. Unless exemplary embodiments and / or their features are explicitly mentioned only as alternatives or are mutually exclusive.

The invention is illustrated and described in more detail below with reference to the examples and figures. It should be noted that different aspects are described that can be used individually or in combination. D. .H. any aspect can be used with different embodiments of the invention, unless explicitly shown as a pure alternative.

Examples

Example setup 1 for a composite pane according to the invention as a panoramic windshield protection disc

In a first example construction, a windshield according to the invention is provided which has a height from the engine edge M. to the roof edge of D. 140 cm. Clear glass panes (PLC Planiclear) with a thickness of 2.1 mm are selected as the outer pane and inner pane. Both panes of glass are each on their surface facing the interior of the vehicle when installed (page II the outer pane and side IV the inner pane) with a black masking print all around. The intermediate layer is essentially formed from a PVB film with a thickness of 0.76 mm, which extends over the entire surface on the outside III the inner pane 2 was placed and starting from the roof edge D. has a ribbon for forming the sun visor protection area with a height of 45 cm. A metal-coated polyethylene terephthalate (PET) film, in other words a PET carrier film with a metal coating and a thickness of 0.025 mm, is placed on the colored area of the PVB film as an IR-reflecting film. A second, thin PVB film with a thickness of 0.025 mm is placed on this IR-reflecting film as a cover and adhesive film for connection to the outer pane. The dimensions of the second PVB film correspond approximately to the dimensions of the IR radiation-reflecting film. The functional film and the thin second PVB film are therefore positioned in such a way that they are arranged in the composite pane exclusively within the sun visor protection area. The further clear area of the windshield thus remains free of the IR radiation-reflecting film. The functional film is selected to be smaller than the sun visor protection area and is surrounded by it like a frame when viewed from above. Advantageously, the edges of the IR rays reflecting film are toward the roof edge D. and to the sides towards the A-pillar of the vehicle through the intended masking pressure A. covered so that they are not visible. Since, according to the invention, the IR radiation-reflecting film is not designed over the entire surface, its lower edge towards the field of vision is not covered by a masking print A. covered. Advantageously, however, the lower edge of the functional film is protruded by the color band to form the sun visor protection area, so that the edge of the functional film is less noticeable than in the clear area of the composite pane.

The connection of the layer stack formed, as described above, to the composite pane can be effected by methods known per se for producing a composite pane. During lamination, the heated, flowable thermoplastic material of the thermoplastic films flows around the IR-reflecting film, so that a stable composite is created and the functional film is securely fixed, encapsulated in the intermediate layer and protected from damage and environmental influences.

For example, so-called autoclave processes can be carried out at an elevated pressure of about 10 bar to 15 bar and temperatures of 130 ° C. to 145 ° C. for about 2 hours. Vacuum bag or vacuum ring processes known per se work, for example, at around 200 mbar and 80 ° C to 110 ° C. The outer pane, the thermoplastic intermediate layer and the inner pane can also be pressed into a pane in a calender between at least one pair of rollers. Systems of this type are known for the production of panes and normally have at least one heating tunnel in front of a press shop. The temperature during the pressing process is, for example, from 40 ° C to 150 ° C. Combinations of calender and autoclave processes have proven particularly useful in practice. Alternatively, vacuum laminators can be used. These consist of one or more heatable and evacuable chambers in which the panes are laminated within about 60 minutes, for example, at reduced pressures of 0.01 mbar to 800 mbar and temperatures of 80 ° C to 170 ° C.

Example setup 2 for a composite pane according to the invention as a panoramic windshield

Analogous to the first example construction, a windshield according to the invention is provided which has a height from the engine edge M. to the roof edge of D. 140 cm. Clear glass panes (PLC Planiclear) with a thickness of 2.1 mm are selected as the outer pane and inner pane. Both panes of glass are each on their surface facing the interior of the vehicle when installed (page II the outer pane and side IV the inner pane) with a black masking print all around. In contrast to the first example structure, the intermediate layer is made of a PVB film with a thickness of 0.76 mm, which is applied over the entire surface to the outside III the inner pane is placed and starting from the roof edge D. a ribbon for forming the sun visor protection area with a height of 45 cm and a second full-surface PVB film with a thickness of 0.38 mm formed, which in the stack formed in contact with the inside II the outer pane (in the edge areas also with the intended masking pressure). A metal-coated polyethylene terephthalate (PET) film, in other words a PET carrier film, is placed between these two PVB films on the sub-area for forming the sun visor protection area of the first PVB film with the color ribbon with a metal coating, arranged with a thickness of 0.05 mm. In this example setup, the second 0.38 mm thick PVB film is used as a cover and adhesive film to connect to the outer pane. The functional film is positioned in the stack in such a way that it is arranged in the composite pane exclusively within the sun visor protection area. The further clear area of the windshield thus remains free of the IR radiation-reflecting film. As in the first example structure, the functional film is selected to be smaller than the sun visor protection area and is surrounded by it like a frame when viewed from above. Advantageously, the edges of the IR rays reflecting film are toward the roof edge D. and to the sides towards the A-pillar of the vehicle through the intended masking pressure A. covered so that they are not visible. Since, according to the invention, the IR radiation-reflecting film is not designed over the entire surface, its lower edge towards the field of vision is not covered by a masking print A. covered. Advantageously, however, the lower edge of the functional film is protruded by the color band to form the sun visor protection area, so that the edge of the functional film is less noticeable than in the clear area of the laminated pane. The connection of the layer stack can be such as construction 1 described.

There were various examples of composite panes with a structure as in the example structure above 2 described, made with three different commercially available IR-reflective films and optically measured. The information and values are given in Table 1. Two customary light transmission values TL for composite panes with ribbon PVB film, namely 13% TL (dark) and 2% TL (very dark) were selected. For this purpose, a comparative example (V1 and V2) without an IR-reflecting film was also produced and measured. 2.1 mm thick clear glass panes (Planiclear PLC) were used as the outer pane and the inner pane. The first film is the one that is in contact with the outer pane and forms the connection to it. The film with the ribbon is the one that makes contact with the inner pane. In the final composite, in the embodiments according to the invention with an IR-reflecting film, the PVB foils fuse to form the intermediate layer. The functional film is surrounded by the polymer material of the foils, encapsulated and embedded in the intermediate layer. Table 1 Measurements of various composite pane laminates with and without a film reflecting IR rays First slide IR reflect. Film (6) Foil with ribbon Thickness of the stack [mm] TL (A) [%] TTS [%] V1 none none 0.76 mm PVB (13% TL) 4.96 12.7 42.4 B1-1 0.38mm PVB 0.05mm metal-free 0.76 mm PVB (13% TL) 5.39 12.5 34, 1 B1-2 0.38mm PVB 0.05mm type 1 0.76 mm PVB (13% TL) 5.39 10.4 26.6 B1-3 0.38mm PVB 0.05mm type2 0.76 mm PVB (13% TL) 5.39 10.5 22.9 V2 none none 0.76 mm PVB (2% TL) 4.96 2.3 32.7 B2-1 0.38mm PVB 0.05mm metal-free 0.76 mm PVB (2% TL) 5.39 2.3 26.7 B2-2 0.38mm PVB 0.05mm type 1 0.76 mm PVB (2% TL) 5.39 1.9 22.4 B2-3 0.38mm PVB 0.05mm type2 0.76 mm PVB (2% TL) 5.39 1.9 19.4

• Die spektralen Messungen werden mit Hilfe eines Spektrophotometers (z.B. Lambda 900) durchgeführt. Hiermit können Transmissions- und Reflektionsspektren gemessen und daraus verschiedene Kenngrößen, wie zum Beispiel die Lichttransmission TL (Lichttransmission der thermoplastischen Folie) und TL(A) (Lichttransmission der Verbundscheibe) oder die totale Transmission der Sonnenengenergie TTS (total transmission of solar energy), bestimmt werden.

Measuring principle and device:

• The spectral measurements are carried out with the aid of a spectrophotometer (eg Lambda 900). This enables transmission and reflection spectra to be measured and various parameters, such as light transmission TL (light transmission of the thermoplastic film) and TL (A) (light transmission of the laminated pane) or the total transmission of solar energy TTS (total transmission of solar energy), to be determined become.

The light transmission TL (A) is according to ASTM D 1003-61 or according to DIN ISO 5033 / EN410 determined. The light type A / 2 ° is used for this. The TTS value is calculated according to ISO 13837 conv. A calculated.

The measurement takes place in the darkest area of the sample, i.e. at the position of the composite pane in the sun visor protection area where the light transmission is lowest. This is a broad area with a more or less constant light transmission TL. In the present examples, the sun visor protection area has a width of 45 cm and is therefore between approx. 95 cm and 140 cm, with 140 cm forming the edge to the roof. In order to avoid possible influences from the glass edges (e.g. scattering effects) as well as impairments from the masking print, keep a distance of at least 2-3 cm from the edge area of the masking print during the measurement. Furthermore, you will not measure directly at a height of 95 cm, where the sun visor protection area begins, in order to ensure that you are already in the darkest area, i.e. that the light transmission is constantly at the lowest value.

A functional film from the company that is available under the trade name 3M UCSF (Ultra Clear Solar Film) is used as the metal-free IR radiation-reflecting film. This consists of two polymers (PET & Co-PMMA) which are alternately arranged as a multi-nanolayer (more than 200 individual layers, with a total thickness of the film of 50 µm). The heat radiation is reduced (reflected) by interference. This is for example also in the WO2017 / 155849 A1 described.

As IR radiation-reflecting films, type 1: Eastman XIR® 70 (trade name) and type 2: Eastman XIR® 70 HPS (trade name) are also used. These two functional films are PET substrates with a metallic coating.

The measurements of the corresponding samples show that in Examples B1-1 and B2-1 with the metal-free functional films, an improvement in the TTS value of approx. 6-8% compared to the TTS values of the comparative examples without films reflecting IR rays, at approx same TL (A) values can be achieved. The improvement in the TTS values with the metal-containing functional films type 1 and type 2 is even more significant at 10-20%, although here the light transmission through the IR radiation reflective films decreases. The thermal comfort can therefore be influenced positively according to the invention. The decrease in light transmission through the metal-containing functional films in the sun visor protection area is not as critical as would be the case, for example, in the central field of vision.

Figure list

• 1 shows a schematic plan view of a composite pane according to the invention with an IR radiation-reflecting film in the sun visor protection area;
• 2 FIG. 4 shows a schematic cross section of the composite pane from FIG 1 along the line X-X ';
• 3 FIG. 11 shows a schematic cross section of another embodiment of the composite pane from FIG 1 along the line X-X '.

1 shows a plan view of a composite pane according to the invention 100 with a sun visor protection area 10 in one embodiment as a windshield. The composite pane according to the invention is preferred 100 a panoramic windshield. This is the height of the windshield 100 from the engine edge M. to the roof edge D. and also the width of the sun visor area 10 designed larger than standard windshields. For example, the width of the sun visor protection area 10 from the roof edge D. from measured> 40 cm, as described in Example 1, for example 45 cm. The edge area of the shown windshield 100 is all around on the inside II the outer pane 1 , as well as on the inside IV the inner pane 2 with a cover print A. , for example provided with a black screen print in the transition to the windshield 100 lines and connections, for example, visually concealed to the body. Within the sun visor protection area 10 is an IR ray reflective film 6th arranged. This is dimensioned smaller than the sun visor protection area 10 and surrounded by this like a frame in plan view. Advantageously, the edges of the IR rays reflecting film 6th to the roof edge D. and to the sides towards the A-pillar of the vehicle through the intended masking pressure A. covered so that they are not visible. Because the IR rays reflective film 6th according to the invention is not designed over the entire area, its lower edge is towards the clear field of vision B. not through a masking print A. covered. Advantageously, the lower edge of the functional film 6th however, it is designed in such a way that the color band for forming the sun visor protection area projects beyond it, so that the edge is less noticeable than in the clear area of the laminated pane. Overall, on the one hand, the IR-rays-reflecting film can be used 6th can be made smaller, which saves production costs and, on the other hand, the composite pane 100 this makes it more visually appealing.

Windshields have a central field of vision B. on whose optical quality high demands are made. The central field of view must have a high light transmission (typically greater than 70%). Said central field of view is, in particular, that field of view that is known by a person skilled in the art as the field of view B. , Viewing area B. or zone B. referred to as. The field of view B. and its technical requirements are set out in Regulation No. 43 of the United Nations Economic Commission for Europe (UN / ECE) (ECE-R43, “Uniform Conditions for the Approval of Safety Glazing Materials and Their Installation in Vehicles”). That is where the field of vision is B. defined in Appendix 18. Advantageously, according to the invention, the field of view remains free from the IR radiation-reflecting film, so that this can not impair the transmission at all.

2 shows a schematic cross section of the composite pane 100 out 1 along the line X-X '. The composite pane consists of an outer pane 1 , an inner pane 2 that have a thermoplastic intermediate layer 3 are connected to each other. The thermoplastic intermediate layer 3 is essentially made up of a PVB film 4th with a ribbon 5 for the formation of the sun visor protection area 10 educated. On the colored area of the PVB film 4th is called an IR rays reflective film 6th a metal-coated polyethylene terephthalate (PET) film, in other words a PET carrier film with a metal coating, arranged with a thickness of 0.025 mm. On this IR reflective film 6th becomes a second, thin PVB film 4a with a thickness of 0.025 mm as a cover and adhesive film 4a for connection to the outer pane 1 and thus also becomes part of the intermediate layer 3 . Here, the dimensions correspond to the second PVB film, i.e. the adhesive film 4a approximately the same size as the IR ray reflective film 6th . The functional film 6th and the thin second PVB film 4a are positioned so that they are in the composite pane 100 exclusively within the sun visor protection area 10 is arranged. The further clear area of the windshield B. thus remains free from the IR-ray reflecting film 6th . The functional film 6th is chosen to be smaller than the sun visor area and from the roof edge D. set back. Advantageously, the edges of the IR-radiation-reflecting film 6th to the roof edge D. and to the sides towards the A-pillar of the vehicle but at the same time through the intended masking print A. covered so that they are not visible. Because the IR rays reflective film 6th is not designed over the entire area according to the invention, its lower edge towards the field of view is not covered by a cover print A. covered. Advantageously, however, the lower edge of the functional film 6th through the ribbon 5 for the formation of the sun visor protection area 10 towers over so that the edge of the functional film 6th is less noticeable than in the clear area of the composite pane, which is more visually appealing. The ribbon 5 is preferably designed wedge-shaped in cross-section and thereby points, at least at its lower, to the engine edge M. The directed end preferably has a transmission profile, the transmission increasing in the direction of the central field of vision and the tint gradually tapering off towards the central field of vision, as it were. This creates a visually more appealing appearance of the transition area from the sun visor protection area to the clear field of vision B. .

3 FIG. 11 shows a schematic cross section of another embodiment of the composite pane from FIG 1 along the line X-X '. The composite pane consists of an outer pane 1 , an inner pane 2 that have a thermoplastic intermediate layer 3 are connected to each other. In contrast to the in 2 embodiment shown, in this embodiment of the invention, the thermoplastic intermediate layer 3 through a PVB film 4th with a ribbon 5 for the formation of the sun visor protection area 10 and another full-area PVB film 4b with a thickness of 0.38 mm as an adhesive layer to the outer pane 1 educated. In other words, the second PVB film is in place 4b in the formed stack in contact with the inside II the outer pane (in the edge areas also with the intended masking pressure 6th and serves as a cover and adhesive film 4b for connection to the outer pane 1 .

Between these two PVB films 4th and 4b , is on the sub-area for the formation of the sun visor protection area of the first PVB film 4th with the ribbon 5 an infrared ray reflective film 6th , for example a metal-coated polyethylene terephthalate (PET) film, with a thickness of 0.05 mm, is arranged. The functional film 6th through the two slides 4th and 4b encapsulated and in the intermediate layer formed therewith 3 stored. The functional film 6th is positioned so that it is in the composite pane 100 exclusively within the sun visor protection area 10 is arranged. The further clear area of the windshield B. thus remains free from the IR-ray reflecting film 6th . The functional film 6th is chosen to be smaller than the sun visor area and from the roof edge D. set back. Advantageously, the edges of the IR rays reflecting film 6th to the roof edge D. and on the sides towards the A-pillar of the vehicle, but at the same time due to the cover pressure provided A. covered so that they are not visible. Because the IR rays reflective film 6th is not designed over the entire area according to the invention, its lower edge towards the field of view is not covered by a cover print A. covered. Advantageously, however, the lower edge of the functional film 6th through the ribbon 5 for the formation of the sun visor protection area 10 towers over so that the edge of the functional film 6th is less noticeable than in the clear area of the composite pane, which is more visually appealing.

According to the invention, a composite pane with a sun visor protection area with an improved heat protection function is provided, which can be produced in a simple and more cost-effective manner, in particular in an embodiment as a panoramic windshield. In addition to providing improved thermal comfort through the IR radiation-reflecting film arranged according to the invention in the sun visor protection area, further functions can be designed or made possible in a simple manner in combination without the need for complex adaptations in the manufacture of the laminated pane.

List of reference symbols

100

Composite pane

10

Sun visor area

1

Outer pane

2

Inner pane

3

Intermediate layer

4th

thermoplastic film (with ribbon)

4a

Adhesive film / second thermoplastic film

4b

thermoplastic film / adhesive film

5

Ribbon

6th

IR rays reflective film

I.

Outer surface of the outer pane

II

Inner surface of the outer pane

III

Outer surface of the inner pane

IV

Inner surface of the inner pane

A.

Masking print (shown the edge of the masking print)

B.

Field of view

D.

Roof edge

M.

Engine edge

QUOTES INCLUDED IN THE DESCRIPTION

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

Patent literature cited

• US 3715420 [0002]
• US 4562023 [0002]
• WO 19970033763 [0003, 0021]
• US 5932329 [0003, 0021]
• WO 2013/104439 [0021]
• DE 19927683 C1 [0021]
• WO 2017/155849 [0021]
• WO 2017/155849 A1 [0042]

Non-patent literature cited

• ASTM D 1003-61 [0040]
• DIN ISO 5033 / EN410 [0040]
• ISO 13837 [0040]

Claims (5)

A composite pane (100) with a sun visor protection area (10), comprising an outer pane (1) with an outer surface (I) and an inner surface (II), an inner pane (2) with an outer surface (III) and an inner surface (IV) and a thermoplastic intermediate layer (3) which connects the surface (II) on the inside with the outside surface (III), characterized in that the intermediate layer (3) comprises at least one thermoplastic film (4) which is a ribbon (5) to form the sun visor protection -Area (10) and between the outer pane (1) of the inner pane (2), exclusively within the sun visor protection area (10), an IR-radiation-reflecting film (6) is arranged. Composite pane (100) Claim 1 characterized in that the IR-reflecting film (6) is embedded in the thermoplastic intermediate layer (3). Composite pane (100) according to Claim 1 or 2, characterized in that the film (6) reflecting IR rays is a single-layer or multi-layer system. Composite pane (100) according to one of the Claims 1 to 3 characterized in that the film (6) reflecting IR rays is applied to a carrier film. Composite pane (100) Claim 1 characterized in that the IR-reflecting film (6) is a functional coating which is arranged on the inner surface (II) of the outer pane (1) and / or the outer surface (III) of the inner pane (2).

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