Glazing, in particular vehicle glazing, for adhesive bonding to a supporting element

Abstract

The invention relates to a glazing (100), in particular vehicle glazing, for adhesive bonding to a supporting element (101), the glazing comprising: a pane (1) having a first surface (IV); a support coating (2) which is applied in an adhesive region (K) on the first surface (IV) of the pane; and a separating element (3) which is at least partially enclosed by the support coating, wherein a layer thickness of the support coating (2) is at least 10 µm and at most 200 µm. The invention also relates to a method for manufacturing such a glazing (100).

Description

[0001] SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT

[0002] Glazing, especially vehicle glazing, for bonding to a supporting element

[0003] The present invention relates to a glazing, in particular a vehicle glazing, for bonding to a supporting element, and to a method for manufacturing this glazing.

[0004] It is common knowledge that vehicle glazing is bonded into the respective openings of the vehicle body. Vehicle windows are typically attached to the body with a continuous bead of adhesive. This bead serves both to seal and to fix the window in place. To replace a vehicle window, it must be removed from the vehicle. This is usually done using a cutting wire, a knife, and / or a heating wire, which is inserted under pressure from the outside into the hardened adhesive bead. This cuts through the adhesive bead, allowing the window to be removed. The cutting wire or heating wire can be guided manually or mechanically. Alternatively, the adhesive bead can also be dissolved chemically or thermally.

[0005] The aforementioned method for removing a bead of adhesive from a vehicle windshield has several disadvantages, including its complexity and laborious nature. This is because the cutting wire, knife, or heating wire must be guided through the hardened adhesive bead. This results in increased material and labor costs and also poses a greater risk of injury and safety. A further difficulty arises from the fact that the cutting wire or heating wire must be moved smoothly and without tilting as it is guided through the adhesive bead to achieve a clean separation. Particular care must be taken to prevent the windshield from being damaged by scratching, splintering, or breakage, which could lead to safety hazards or higher costs.

[0006] EP0521825A2 discloses a vehicle windshield with an adhesive bond that incorporates a heatable polymeric separating element within the adhesive bond during installation in a vehicle. DE60036311T2 discloses a heating wire that is inserted into the adhesive bead before bonding. These solutions allow the adhesive bond between the windshield and the supporting structure to be easily and subsequently released without significant risk of damage. However, a disadvantage of these solutions is that inserting a separating element into the adhesive layer is more complex, as the separating element often shifts, resulting in insufficient separation in some sections. Another problem is that the separating element can impair the adhesive effect (SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT), since the adhesive bond only indirectly bonds the supporting structure (e.g., the vehicle body) and the windshield, at least in some areas.

[0007] Further examples of previously known solutions can be found in DE 38 08 509 A1 , US 4 581 276 A and EP 1 084 888 A1.

[0008] The object of the invention is to provide a glazing, in particular a vehicle glazing, which solves the problems known from the prior art or at least exhibits them to a lesser extent. The glazing should bond well to a supporting element, be removable from the supporting element after bonding with minimal damage, and allow for simplified handling of a separating element. Furthermore, it is an object of the invention to provide a method for manufacturing such glazing, wherein the method should be cost-effective and easy to implement.

[0009] The solution to the technical problem is revealed in independent claims 1 and 12. Preferred embodiments of the invention are revealed in the dependent claims.

[0010] The glazing according to the invention comprises at least one pane with a first surface, also called the interior surface, and an opposing second surface, also called the exterior surface. The pane also includes a circumferential edge surface that connects the interior and exterior surfaces. The circumferential edge surface preferably comprises a top edge and a bottom edge, as well as two side edges connecting the top and bottom edges. A support coating is applied to the interior surface of the pane in an adhesive area. The glazing is designed to be bonded to a support element. The support element can, for example, be formed by an opening in a building, a vehicle, or a piece of furniture or decoration. The support element is, for example, a window frame or a window frame of a building or vehicle.The glazing is preferably vehicle glazing, which is designed to be glued into a window frame of a vehicle.

[0011] The first surface of the disc, also called the interior surface, is designed to be bonded to a supporting element. The interior surface is SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT

[0012] The first surface is therefore oriented towards the support element when installed. The second surface of the disc, also called the outer surface, is designed to face the external environment when installed on a support element, for example in a vehicle. The inner surface is therefore oriented away from the support element when installed. However, the invention is not limited to this.

[0013] The adhesive area of ​​the pane refers to the area of ​​the pane intended to be bonded to a supporting element. The adhesive area is thus designed to be provided with an adhesive layer that connects the pane to the supporting element. According to the invention, the glazing also includes a separating element, wherein the separating element is arranged on the pane such that it is at least partially enclosed by the supporting coating. "Enclosed by the supporting coating" means that at least 40%, preferably at least 50%, of the outer surface of the separating element is in direct contact with the supporting coating. Preferably, the separating element is completely embedded within the supporting coating. The supporting coating thus encloses the entire outer surface of the separating element.

[0014] A primer is a coating designed to improve the adhesion of the glass pane to a support structure via an adhesive layer. Since the support structure and the glass pane are often made of different materials—the support structure is typically metal or plastic, while the pane is made of mineral glass such as soda-lime glass—finding an adhesive capable of firmly bonding them is challenging. The bond depends on the interaction between the adhesive and the surfaces of the materials being bonded. The adhesive must exhibit strong adhesion and cohesion. Therefore, finding an adhesive that bonds different materials effectively while maintaining good long-term stability presents a significant challenge.This problem can be solved, or at least largely mitigated, by using a support coating such as that employed in accordance with the invention. The support coating exhibits good adhesion to the disc and is simultaneously designed to also bond very effectively with an adhesive layer for a support element.

[0015] The inventors were surprised and unexpected to discover that the subsequent bonding of the disc to the support element using an adhesive layer is simplified by at least partially integrating a separating element into the substrate coating. In the SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT system, the separating element is not only completely protected from external damage and largely from corrosion, but it can also be fitted with exceptional precision into or onto the substrate coating, thus largely preventing subsequent slippage during the application of the adhesive layer. Due to its at least partial integration within the substrate coating, the separating element also comes into only minimal contact with the adhesive layer, which, surprisingly, does not impair the adhesive effect of the layer, or only minimally so.

[0016] The separating element, as defined in the invention, is designed to detach the pane, which is bonded to a support element, from the support element. A common application is, for example, removing a damaged vehicle window from a vehicle. The separating element is therefore only used when the bond between the pane and the support element needs to be broken. The separation of the pane from the support element can be achieved, for example, by mechanical cutting. The separating element, by applying force (kinetic energy), penetrates the adhesive layer and / or the support coating, thereby breaking the bond. Alternatively or additionally, the separating effect can also be achieved by heating (thermal energy) the adhesive layer and / or the support coating.In adhesive layers (adhesive beads) commonly used in the automotive sector, the viscosity of the adhesive layer decreases with heat, and the chemical bonds within the adhesive layer weaken. This causes the adhesive layer to become softer and less adhesive, which facilitates separation of the bond. To achieve separation by means of heat, electrical contact of the separating element is generally necessary. For this purpose, the separating element can protrude slightly from the substrate (and, if applicable, the adhesive layer) so that it can be directly electrically contacted. Alternatively, the electrical contact can be subsequently pressed into the substrate and / or adhesive layer until the separating element is reached. In a preferred embodiment of the invention, the separating element is electrically heatable.

[0017] The separating element can have any conceivable shape, preferably being essentially pin-shaped, cuboid, or plate-shaped. Particularly preferably, the separating element is foil-shaped or wire-shaped, especially wire-shaped. The separating element is, for example, a heating wire and / or a cutting wire. Alternatively, the separating element is, for example, a heating film or a cutting film. Designing the separating element as a cutting wire or cutting film has the advantage that no electrical contact of the separating element is necessary to separate the disc from the support element (SAINT-GOBAIN SEKURIT FRANCE 2024283- WO-PCT), which can be difficult depending on the location and equipment. On the other hand, the disc can be removed from the support element more easily and without damage by means of an adhesive layer liquefied by heating.

[0018] In a preferred embodiment of the invention, the separating element comprises plastic and / or metal; preferably, the separating element comprises polyamides—for example, polyhexamethylene adipamide (also known to those skilled in the art as nylon)—natural rubber, tungsten, copper, iron, and / or steel. Particularly preferably, the separating element consists of plastic and / or metal; more specifically, the separating element consists of polyamides—for example, polyhexamethylene adipamide—natural rubber, tungsten, copper, iron, or steel, or mixtures thereof. These materials are particularly suitable for achieving a high cutting and / or heating effect. Most preferably, the separating element is a polyamide thread, a natural rubber thread, or a metal wire. Threads made of natural rubber are particularly resistant to abrasion and weathering.

[0019] In a further preferred embodiment of the invention, the separating element contains natural fibers, in particular fibers made of hemp or jute. Particularly preferably, the separating element consists of a hemp thread or a jute thread. These materials are biodegradable and therefore particularly environmentally friendly.

[0020] In a further preferred embodiment of the invention, the separating element comprises fibers made of aromatic polyamides (aramid), particularly preferably fibers made of poly(azanediyl-1,4-phenyleneazanediyl terephthaloyl). Materials made of poly(azanediyl-1,4-phenyleneazanediyl terephthaloyl) are commercially available, for example, from DuPont (Kevlar). The separating element is particularly preferably made of an aramid thread. Aramid separating elements exhibit high strength and resistance while simultaneously being lightweight. In contrast to separating elements made of metal or alloys, they are also more corrosion-resistant.

[0021] In a further preferred embodiment of the invention, the separating element comprises ultra-high-molecular-weight polyethylene (UHMWPE). Particularly preferably, the separating element consists of ultra-high-molecular-weight polyethylene. Ultra-high-molecular-weight polyethylene is a thermoplastic polymer material with an exceptionally high molecular density. It consists of long-chain molecules composed of many ethylene units. The high molecular density of UHMWPE SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT gives it exceptional strength, stiffness, and resistance to abrasion and wear. Another advantage of UHMWPE is its resistance to chemicals, UV radiation, and moisture. UHMWPE is commercially available, for example, under the brand names Dyneema or Spectra.

[0022] In a further particularly preferred embodiment of the invention, the separating element comprises a metallic core enclosed by a plastic sheath. The core of the separating element preferably comprises a metallic plate or, alternatively, a metallic wire. The wire or plate preferably contains tungsten, copper, iron, and / or steel, or mixtures thereof. Particularly preferably, the wire or plate consists of tungsten, copper, iron, and / or steel, or mixtures thereof. The sheath around the core preferably contains or consists of polyurethane. In other words, the separating element according to this embodiment is a composite element, for example, a composite rope. The metallic core gives the separating element the necessary strength and stiffness to cut through the adhesive layer. The plastic sheath, on the other hand, protects the core from corrosion and mechanical damage.

[0023] The separating element, when formed in plate or foil form, preferably has a layer thickness of 10 pm to 1 mm, particularly preferably 50 pm to 0.5 mm, and especially 100 pm to 200 pm. If the separating element is pin-shaped, cuboid-shaped, particularly wire-shaped or thread-shaped, then it preferably has a cross-sectional diameter of 10 pm to 1 mm, particularly preferably 50 pm to 0.5 mm, and especially 100 pm to 200 pm. In this range, both good cutting action and heat generation occur. Alternatively, however, layer thicknesses or cross-sectional diameters of at least 300 pm may also be preferred, particularly at least 400 pm, 500 pm, or 600 pm (with an upper limit, regardless of this, of no more than 1 mm). In these diameter or cross-sectional diameter ranges, the cutting element is characterized by a high degree of efficiency.In layer thickness ranges, the separating element projects beyond the support coating according to the invention (see below) at least a certain distance beyond the support coating, namely into the adhesive layer during or after the assembly of the glazing with the vehicle body, so that a simpler separation of glazing and vehicle body can be achieved.

[0024] The base coat preferably contains silanes and / or polyurethane, particularly aromatic or aliphatic polyurethane. The polyurethane improves the adhesion of the base coat to the adhesive layer, whereas the silanes improve the adhesion to mineral glass. Alternatively or additionally to polyurethane, the base coat may also contain polyacrylate and / or polyepoxide.

[0025] In a preferred embodiment, the base coating contains a solvent before curing or drying. The solvent preferably contains ester, aldehyde, and / or ketone compounds, particularly preferably ethyl acetate, propanone, and / or butanone. Before application to the disc, the base coating preferably contains 30 wt.% to 70 wt.%, and particularly preferably 40 wt.% to 60 wt.%, of solvent. The desired viscosity of the base coating can be precisely controlled by adjusting the solvent content. Furthermore, the drying time of the base coating is optimized by the type of solvent. The viscosity can thus be adjusted to achieve the desired fixation of the separating element, with the aforementioned compounds and proportions proving particularly advantageous.

[0026] In a preferred embodiment of the invention, the base coating contains solid pigments such as carbon black. Solid pigments increase the viscosity of the base coating and simultaneously serve as UV protection for the adhesive layer. Due to their opacity, carbon black-based pigments can help to block the view through the glass to interior elements. Masking layers frequently found in the adhesive area, such as screen printing, are not necessarily sufficient for this purpose. The base coating preferably contains up to 40 wt.%, more preferably up to 30 wt.%, and particularly up to 20 wt.% solid pigments, especially carbon black. The base coating preferably contains at least 5 wt.% solid pigments, especially carbon black. For the purposes of this invention, carbon black is understood to be a powdered solid that preferably contains between 80 wt.% and 99.5 wt.% carbon.Industrial soot (also called carbon black) is particularly preferred as a soot additive to the base coating.

[0027] According to the invention, the thickness of the base coating is from 10 pm to 200 pm, particularly preferably from 15 pm to 25 pm. Layer thicknesses from 10 pm, preferably from 20 pm, are particularly suitable, as these are thick enough to effectively fix the separating element. The base coating with the layer thickness described above advantageously combines two properties. On the one hand, a base coating with the aforementioned layer thickness exhibits sufficiently good cohesive properties or cohesion to enable reliable mounting or fixing of the disc on or to the vehicle body (see also the preceding explanations). The SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT typically exhibits

[0028] Base coatings exhibit comparatively good adhesive properties, but their cohesion is often lower due to the materials used. A base coating with a significantly greater thickness is therefore less advantageous, for example, with regard to the permanent fixation of the windshield to the vehicle body. On the other hand, with such thicknesses, the separating element preferably (given sufficient thickness) protrudes beyond the base coating, thus facilitating easier separation of the glazing and the vehicle body. Furthermore, base coatings with such thicknesses have already been tested and are relatively easy to manufacture in existing production facilities or production lines.

[0029] The base coating preferably has a substantially constant layer thickness with a maximum deviation from the average layer thickness of at most 10%, preferably at most 5%, at any point of the coating.

[0030] Unless otherwise stated, the layer thickness specification refers to the geometric layer thickness.

[0031] The thickness of layers and coatings can be determined, for example, using micrometers, scanning electron microscopes, interreference microscopes, atomic force microscopes, or light microscopes, depending on the thickness range. For layers in the nanometer range, X-ray reflectometry (XPR) or a scanning electron microscope (SEM) in combination with a focused ion beam (FIB) can also be used to measure the layer thickness. Methods for determining layer thickness are known to those skilled in the art.

[0032] Methods for applying base coatings are generally known to those skilled in the art. Preferably, the substrate, which forms the base coating on the disc, is stored in a vessel, for example, a container, and conveyed by a pump into a metering system. To prevent the substrate from hardening before it is applied to the disc, the vessel is preferably filled with a protective gas, for example, nitrogen or argon. The base coating can be metered, for example, by means of a peristaltic pump or a dispenser. Both the peristaltic pump and the dispenser convey the substrate directly to the application tool. However, with the dispenser, the metering is more precisely controlled, and the substrate flow to the application tool is more continuous. Subsequently, the substrate is applied to the disc as a base coating mechanically, preferably by means of a robotic arm.The application tool SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT is preferably mounted at the front of a tip of the robot arm and includes, for example, a nozzle that dispenses the substrate. However, the robot arm can also have more than one tip, in particular two tips, each comprising a nozzle for dispensing the substrate. To ensure better distribution of the substrate, it is preferably applied to the disk via an absorbent material. The absorbent material can, for example, be attached to the application tool below the nozzle. Before the substrate is applied to the disk, it can be saturated in a solvent. Suitable solvents include those described in a preferred embodiment of the invention. For example, the absorbent material could be saturated in a solvent before the substrate is distributed onto the disk through the nozzle.Mixing the substrate with the solvent before application is also conceivable. The solvent delays the reaction of the substrate, meaning that hardening essentially only occurs after application to the disc.

[0033] In a preferred embodiment of the invention, the absorbent material comprises needle felt, melamine resin, and / or porous foam. Particularly preferably, the absorbent material consists of needle felt, melamine resin, and / or porous foam. The needle felt may contain fibers of wool, cotton, polyester, polyamides (e.g., nylon), and / or acrylates. The porous foam may contain polyurethane (PU), polyethylene (PE), and / or polyvinyl chloride (PVC).

[0034] In a preferred first embodiment of the invention, the separating element is arranged between the carrier coating and the inner surface of the pane. In other words, the separating element is covered by the carrier coating. This securely fixes the separating element to the pane, thus largely preventing slippage during the application of the adhesive layer. The separating element can be pre-fixed to the inner surface by means of an adhesive layer before the carrier coating is applied to the pane and the separating element. Alternatively, it is also possible to insert the separating element into the carrier coating already applied to the pane. This can be done, for example, by pressing the separating element into the carrier coating. Preferably, a press is used to press the separating element into the carrier coating, which has not yet fully cured.Preferably, at least 60% of the outer surface of the separating element is covered by the carrier coating. This variant is particularly advantageous when the separating element is designed as a solid wire. SAINT-GOBAIN SEKURIT FRANCE 2024283- WO-PCT.

[0035] In a further preferred embodiment of the invention, the separating element is completely enclosed by the carrier coating. This can be achieved, for example, by first applying a first layer of the carrier coating to the bonding area of ​​the disc, then positioning the separating element on this first layer, preferably fixing it in place. In the final step, a second layer of the carrier coating is applied to the first layer and the separating element. This variant has the advantage that even local thickness variations caused by the separating element can be specifically compensated for, which improves the adhesive effect with the adhesive layer.

[0036] According to the invention, the support coating extends at least partially over the bonding area, preferably over the entire bonding area of ​​the pane. The bonding area is preferably an edge region of the pane that borders the pane's perimeter. For example, the bonding area is an area directly adjacent to the top edge, the bottom edge, or one of the side edges. However, it is particularly preferred that the bonding area be an edge region of the pane that borders more than one edge of the pane. In particular, the bonding area extends in a frame-like manner along the pane's perimeter. The bonding area thus forms a frame that surrounds a central area (usually the area intended for viewing through) of the pane.

[0037] According to the invention, the separating element is also arranged within the adhesive area. The separating element preferably extends at least partially over the adhesive area, without completely covering it. The separating element can also be arranged in only one or more sections of the adhesive area. If, for example, the adhesive area extends in a frame-like shape along the circumferential edge, the separating element can be arranged only in the section of the adhesive area adjacent to one of the side edges, the top edge, and / or the bottom edge. Preferably, however, the separating element extends along at least 50% of the edge area adjacent to the edge of the disc; for example, the separating element extends along the section of the adhesive area adjacent to the top and bottom edges.In particular, the separating element extends over the entire adhesive area, whereby, as stated above, this does not mean that the separating element completely covers the adhesive area. Instead, it means that the separating element extends parallel to the direction of extension of the adhesive area within the adhesive area. This means that if the adhesive area is frame-shaped, the separating element also forms a frame, which is located within the adhesive area but has a narrower frame width. SAINT-GOBAIN SEKURIT FRANCE 2024283- WO-PCT.

[0038] In a further preferred embodiment of the invention, the glazing also comprises a further pane and a thermoplastic interlayer. The further pane is connected to the first pane according to the invention (i.e., the pane with the supporting coating) over its entire surface via the thermoplastic interlayer. The glazing thus comprises a laminated pane. The further pane has an inner surface facing the first pane and an outer surface facing away from the first pane. The thermoplastic interlayer is arranged on the inner surface of the further pane and on the outer surface of the first pane. The first pane is intended to be the inner pane of the glazing, while the further pane is intended to be the outer pane of the glazing.In this context, the term "inner pane" as used in the invention refers to the pane facing the interior (vehicle interior). The term "outer pane" refers to the pane facing the external environment.

[0039] The thermoplastic interlayer comprises at least one thermoplastic composite film, but may also include several thermoplastic composite films. The thermoplastic composite films preferably contain polyvinyl butyral (PVB), ethylene-vinyl acetate copolymers (EVA), and / or thermoplastic polyurethanes (TPU). The composite films of the interlayer are preferably made of the same material, but can, in principle, also be made of different materials. The thickness of each individual thermoplastic composite film is preferably from 0.1 mm to 2 mm, and particularly preferably from 0.3 mm to 0.8 mm. Particularly preferably, the total thickness of the interlayer, i.e., the sum of the thicknesses of all thermoplastic layers of the interlayer, is from 0.2 mm to 5 mm (based on the average thickness). Most preferably, the thermoplastic interlayer has an average thickness of 0.38 mm or 0.76 mm.The layers of the thermoplastic intermediate layer can be tinted or untinted. Preferably, the intermediate layer is based on thermoplastic materials, i.e., it consists predominantly (> 50 vol.%) of them.

[0040] If something, for example a film or a layer, is based on a polymeric material, this means that it contains the material predominantly (a proportion greater than 50 wt.%), preferably at least 60%, particularly preferably at least 70%, and especially at least 90%, and may optionally contain other components, for example plasticizers, stabilizers, UV or IR absorbers. SAINT-GOBAIN SEKURIT FRANCE 2024283- WO-PCT

[0041] The pane and any additional pane are preferably made of mineral glass, in particular soda-lime glass, which is common for window panes. However, they can also be made of other types of glass (for example, borosilicate glass, quartz glass, aluminosilicate glass) or transparent plastics (for example, polymethyl methacrylate or polycarbonate). The thickness of the pane(s) (e.g., inner pane, outer pane) can vary widely. Preferably, panes with a thickness in the range of 0.8 mm to 5 mm, more preferably from 1.4 mm to 2.5 mm, are used, for example, those with standard thicknesses of 1.6 mm or 2.1 mm. They can be untempered, partially tempered, or tempered independently of one another. If at least one pane is to have a temper, this can be thermal or chemical tempering. In an advantageous embodiment of the invention, the outer pane of the glazing, as a laminated pane, is tinted.This is particularly suitable if the glazing is used as a vehicle roof window.

[0042] The glazing preferably has an opaque masking area through which no visibility is possible. This masking area is preferably arranged around the perimeter of the pane or the adjacent pane. The masking area surrounds a central transparent viewing area in a frame-like manner. This is particularly common for vehicle windows. The masking area is preferably formed by an opaque element, for example, by an opaque printed overlay. If the glazing comprises a laminated pane, the opaque element can also be formed by an opaque section of the interlayer. However, the masking area is particularly preferably formed by an opaque printed overlay.Such a masking layer is typically formed by an enamel containing glass frits and a black pigment, which is applied using screen printing or digital printing and then fired into the surface of the panes. When applied using digital printing, the enamel is preferably applied to the pane as ink from an inkjet printer. The opaque masking layer is preferably applied to the outer or inner surface of the pane (first pane). The masking layer preferably covers the entire adhesive area of ​​the pane. This provides better protection for the substrate and the adhesive layer against UV radiation. The opaque masking layer preferably has a light transmittance of at most 30%, particularly preferably at most 20%, and especially between 1% and 10%.If the base coat and the opaque masking area are at least partially overlapping (SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT), the light transmission through the glazing in the overlapping area can be further reduced. This applies particularly if the base coat contains carbon black.

[0043] In a preferred embodiment of the invention, an adhesive layer is applied to the substrate. Preferably, the adhesive layer extends over at least 70%, more preferably at least 80%, and particularly substantially the entire surface of the substrate. The adhesive layer is intended to bond the glazing to a support element, especially a vehicle. Applying the adhesive layer to the substrate improves the bond between the glazing and the substrate.

[0044] The adhesive layer preferably has a thickness of 0.1 mm to 0.3 mm after application, particularly preferably 0.5 mm to 50 mm, most preferably 1 mm to 30 mm, and especially 1.5 mm to 15 mm. The specified layer thickness ranges mean that the thickness of the adhesive layer lies within the stated range regardless of the measurement location.

[0045] The adhesive layer can contain a one-component adhesive and / or a two-component adhesive. One-component and two-component adhesives are generally familiar to those skilled in the art. Adhesives consist of a variety of chemical compounds and can be divided into several main categories, including one-component and two-component adhesives. One-component adhesives are ready-to-use and cure through physical processes such as solvent evaporation, UV radiation, or chemical reactions with moisture in the air. Two-component adhesives, on the other hand, consist of two separate components that must be mixed immediately before application. These two components, often referred to as resin and hardener, react with each other and cure through a chemical reaction.Regardless of the type of adhesive, evaporation occurs either through the evaporation of solvents or through chemical reactions that release heat or other byproducts during curing.

[0046] The adhesive layer preferably contains a structural adhesive, a sealant, a hot melt adhesive, an acrylate adhesive, and / or a butyl rubber adhesive. Particularly preferably, the adhesive layer contains a two-component adhesive system based on SAINT-GOBAIN SEKURIT FRANCE 2024283- WO-PCT.

[0047] Epoxy resin-based, a polyurethane or silicone-based sealant and / or a hot melt adhesive based on ethylene-vinyl acetate copolymer (EVA) or polyamide.

[0048] The invention further extends to a method for manufacturing glazing according to the invention, in particular for manufacturing vehicle glazing. The glazing is intended to be bonded to a supporting element. The method comprises at least:

[0049] (A) The provision of a disc with an interior-facing surface and

[0050] (B) the application of a separating element and a support coating in an adhesive area on the interior surface of the disc, such that the separating element is at least partially enclosed by the support coating.

[0051] In a preferred embodiment of the invention, the separating element is arranged on the inner surface of the pane in step (B), and then the carrier coating is applied so that the separating element is completely covered by the carrier coating. This securely fixes the separating element to the pane and hardly impairs the adhesive effect between the carrier coating and a subsequently applied adhesive layer.

[0052] In a preferred embodiment of the invention, a substrate is pumped from a vessel, for example a container, into a metering system and then applied as a support coating to the adhesive area of ​​the inner surface of the pane by means of an application tool, as described in step (B). The vessel is preferably filled with a protective gas, for example nitrogen or argon. The metering of the support coating is preferably carried out by means of a peristaltic pump or a dispenser. Particularly preferably, the substrate is applied to the pane as a support coating mechanically, preferably by means of a robot arm. The application tool is preferably mounted at the front of a tip of the robot arm and includes, for example, a nozzle that dispenses the substrate. However, the robot arm can also have more than one tip, in particular two tips, each comprising a nozzle for dispensing the substrate.In particular, the base coating is applied to the disc via at least two tips of the application tool.

[0053] In a further particularly preferred embodiment of the invention, the carrier coating is applied to the disc via an absorbent material. The absorbent material can, for example, be located below the nozzle on the application tool according to the embodiment previously described in SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT. Before the substrate is applied to the disc to form the carrier coating, it can be saturated in one or more solvents. Suitable solvents include those described in a preferred embodiment of the invention. For example, the absorbent material could be saturated in a solvent before the substrate is distributed onto it through the nozzle. Mixing the substrate with the solvent before application is also conceivable. The solvent delays the reaction of the substrate, so that curing essentially occurs only after application to the disc.In the context of the invention, "saturation" means that the absorbent material has absorbed solvent, i.e., has absorbed a certain volume of the solvent (like a sponge). The absorbent material is preferably saturated with at least 10 vol.%, more preferably with at least 20 vol.%, and particularly preferably with at least 30 vol.% of the solvent. The term "vol.%" refers to the volume of the solvent in relation to the volume of the absorbent material in its dry state.

[0054] In a further embodiment of the invention, an adhesive layer is applied to the substrate coating. Preferably, the adhesive layer is applied to the substrate coating mechanically. Alternatively, however, manual application of the adhesive layer is also possible.

[0055] The glazing according to the invention can be used as vehicle glazing, building glazing, or furniture glazing, in particular as a roof pane, windshield, rear window, or side window of a vehicle. A particularly preferred use is as a roof pane or windshield of a vehicle. The vehicle can, in principle, be any land vehicle, watercraft, or aircraft, but is preferably a passenger car, truck, or rail vehicle. The glazing can also be used in buildings, for example, as a window pane, glass facade, or glass door in exterior or interior areas, in particular as a window pane of a building or an interior space. The glazing can also be used as a component of furniture, electrical appliances, furnishings, or as a furnishing element.

[0056] The various embodiments of the invention can be implemented individually or in any combination. In particular, the aforementioned features can be used not only in the combinations specified, but also in other combinations or on their own, unless they are explicitly described as possible only as alternatives to one another without departing from the scope of the present invention. SAINT-GOBAIN SEKURIT FRANCE 2024283- WO-PCT

[0057] The invention is explained in more detail with reference to drawings and embodiments. The drawings are schematic representations and not to scale. The drawings do not limit the invention in any way. They show:

[0058] Fig. 1 shows a cross-sectional view of an edge region of the glazing according to the invention, comprising a pane, a base coating and a separating element arranged within the base coating.

[0059] Fig. 2 shows the glazing from Fig. 1, which is bonded to a support element.

[0060] Figs. 3-6 show further embodiments of the glazing according to the invention, which are bonded to a supporting element, and

[0061] Fig. 7 shows a top view of a glazing according to the invention designed as a windshield.

[0062] Figure 1 shows a cross-sectional view of an edge region of the glazing 100, looking at the circumferential edge surface of the glazing 100. The glazing 100 is, for example, vehicle glazing, in particular a side window or rear window of a vehicle. The glazing 100 comprises a pane 1, which is, for example, made of soda-lime glass and has a thickness of 1.6 mm. The pane 1 has an outer surface III and an opposing inner surface IV, as well as a circumferential edge surface. The glazing 100 also comprises a support coating 2, which is applied to the inner surface IV of the pane 1 adjacent to the circumferential edge surface.The support coating 2 is applied to an adhesive area K of the pane 1, the adhesive area K being, as is typical for vehicle glazing, arranged in a frame around the inner surface IV of the pane 1 (see Figure 7 to illustrate the frame-like arrangement of the adhesive area K). The support coating 2 consists, for example, primarily of an aliphatic polyurethane and carbon black. The thickness of the support coating 2 is, for example, 200 µm.

[0063] A separating element 3 is arranged within the substrate 2. The separating element 3 is positioned within the substrate 2 such that it is completely or at least substantially completely encased by the substrate 2. The separating element 3 may optionally protrude from the substrate 2 at certain points, for example, to facilitate its location. If the separating element 3 is electrically heatable, this protrusion may also serve to make the separating element 3 electrically contactable. The separating element 3 is designed as a wire, for example, a heating wire and / or cutting wire. The wire is made of tungsten or a tungsten alloy, for example. The separating element 3 has a diameter of, for example, 30 µm.

[0064] Figure 2 shows the glazing 100, which is firmly bonded to a support element 101, for example, the mounting surface of a vehicle body, by means of an adhesive layer 6. The adhesive layer 6 is thus arranged between the glazing 1 and the support element 101. The adhesive layer 6 is therefore applied on the one hand to the support coating 2 of the glazing 100 and on the other hand to the support element 101. The adhesive layer 6 is, for example, 200 µm thick and comprises a plastic carrier material and an adhesive. The adhesive contains, for example, a polyurethane compound. The plastic carrier material is, for example, made of polyethylene terephthalate. The adhesive is arranged, for example, between the support element 101 and the plastic carrier material and bonds them together. Optionally, the adhesive can also be arranged between the support coating 2 and the plastic carrier material and bond them together.

[0065] Figures 3 to 6 show further embodiments of the glazing 100, which are connected to a supporting element 101 via an adhesive layer 6. The glazing 100s are shown in cross-sectional views in Figures 1 and 2, where only an edge region of the glazing 100 is depicted. The glazing 100s of Figures 3 to 6 have essentially the same features as the glazing 100 from Figures 1 and 2, so only the differences will be discussed here, and reference is made to Figures 1 and 2 for further details.

[0066] The glazing 100 of Figure 3, unlike the glazing of Figure 1, comprises a second separating element 3 in addition to the first separating element 3. Both separating elements 3 are, for example, formed as a polymer thread; in particular, the separating elements 3 consist of polyhexamethylene adipamide. In the present embodiment, the separating elements 3 are not completely enclosed by the support coating 2, but are arranged between the adhesive layer 6 and the support coating 2, so that the support coating 2 partially encloses the separating elements 3. By using two separating elements 3, the glazing 100 can be detached from the support element 101 even more easily and reliably.

[0067] Unlike the separating element 3 of the glazing 100 shown in Figures 1 and 2, the separating element 3 shown in Figure 4 is not in the form of a wire, but rather in the form of a film, preferably a heating film and / or cutting film. The separating element 3 is positioned, for example, centrally on the inner surface IV of the pane 1 in the bonding area K before the application of the carrier coating 2. The carrier coating 2 is then applied to the separating element 3 and the inner surface IV of the pane 1. This causes the carrier coating 2 to at least partially enclose the separating element 3. The separating element 3 is, for example, based on polycarbonate, which is optionally designed to be electrically heated, for example, by means of metal powder. The thickness of the film is, for example, 150 µm.

[0068] The separating element 3 in Figure 5, as described for Figure 4, is also designed as a film. However, in Figure 5, the separating element 3 is arranged completely within the base coating 2. This can be achieved, for example, by applying two layers of the base coating 2, with the separating element 3 positioned between the two layers.

[0069] The glazing 100 shown in Figure 6 is designed as a laminated pane, wherein the (first) pane 1 is bonded to a second pane 4 by means of a thermoplastic interlayer 5 on its outer surface III. The second pane 4 is, for example, also made of soda-lime glass and has a thickness of 1.6 mm. The thermoplastic interlayer 5 is, for example, based on PVB and has a thickness of 0.35 mm. The second pane 4 has an inner surface II on which the thermoplastic interlayer 5 is arranged. The second pane 4 also has an outer surface I, which faces away from the first pane 1. In this case, the glazing 100 is designed, for example, as a windshield for a vehicle.

[0070] Figure 7 shows a top view of an embodiment of the glazing 100 according to the invention, as shown, for example, in Figures 1 to 6 and described therein. The glazing 100 is designed, for example, as a windshield for a vehicle. An adhesive area K is shown in a circumferential edge region of the glazing 100, which, according to the invention, is provided with a support coating 2. SAINT-GOBAIN SEKURIT FRANCE 2024283- WO-PCT

[0071] Reference symbol list

[0072] 1 disc, inner disc

[0073] 2 Base coating 3 Separating element

[0074] 4 more panes, outer pane

[0075] 5 Intermediate layer

[0076] 6 adhesive layer 100 glazing

[0077] 101 Supporting element

[0078] K adhesive area

[0079] I Outer surface of the additional pane 4 II Inner surface of the additional pane 4

[0080] III outer (second) surface of the disc 1

[0081] IV Interior-side (first) surface of the disc 1

Claims

SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT Patent claims 1. Glazing (100), in particular vehicle glazing, for bonding to a support element (101), comprising a pane (1) with a first surface (IV), a support coating (2) which is applied in an adhesive area (K) on the first surface (IV) of the pane (1) and a separating element (3) which is at least partially enclosed by the support coating (2), wherein a layer thickness of the support coating (2) is at least 10 pm and at most 200 pm.

2. Glazing (100) according to claim 1, wherein the separating element (3) is pin-shaped and preferably contains metal and / or plastic.

3. Glazing (100) according to claim 1 or 2, wherein the separating element (3) is at least a metal wire.

4. Glazing (100) according to one of claims 1 to 3, wherein the separating element (3) is electrically heated.

5. Glazing (100) according to one of claims 1 to 4, wherein the supporting coating (2) comprises: Silanes and / or polyurethane; and / or Soot, preferably up to 40 wt.% soot.

6. Glazing (100) according to one of claims 1 to 5, wherein the separating element (3) is arranged between the support coating (2) and the pane (1).

7. Glazing (100) according to one of claims 1 to 6, wherein the separating element (3) is completely enclosed by the supporting coating (2).

8. Glazing (100) according to any one of claims 1 to 6, wherein the separating element (3) has a cross-sectional diameter or layer thickness of 10 pm to 1 mm, preferably of 300 pm to 1 mm.

9. Glazing (100) according to one of claims 1 to 8, wherein the bonding area (K) extends in a frame-like manner along a circumferential edge of the pane (1). SAINT-GOBAIN SEKURIT FRANCE 2024283-WO-PCT 10. Glazing (100) according to any one of claims 1 to 9, further comprising a further pane (4) and a thermoplastic intermediate layer (5) located between the first pane (1) and the further pane (4).

11. Glazing (100) according to one of claims 1 to 10, wherein an adhesive layer (6) is applied to the support coating (2).

12. Method for producing a glazing (100), in particular vehicle glazing, for bonding to a supporting element (101), wherein (A) a disk (1) with a first surface (IV) is provided and (B) a separating element (3) and a support coating (2) are applied in an adhesive area (K) on the first surface (IV) of the disc (1) such that the separating element (3) is at least partially enclosed by the support coating (2), wherein the thickness of the support coating (2) is at least 10 pm and at most 200 pm.

13. Method according to claim 12, wherein in step (B) the separating element (3) is first arranged on the first surface (IV) and then the support coating (2) is applied so that the separating element (3) is covered by the support coating (2).

14. Method according to claim 12 or 13, wherein in step (B) the base coating (2) is applied using an application tool comprising at least one nozzle for extruding the base coating (2).

15. Method according to claim 14, wherein in step (B) the support coating (2) is applied to the at least one nozzle on the first surface (IV) of the disk (1) by means of an absorbent material, wherein the absorbent material is preferably saturated with a solvent.

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