A method for functionalizing a plastic surface and a method for assembling glazing onto a plastic surface

Abstract

Method for functionalizing a plastic surface and method for assembling glazing onto a plastic surface. The invention relates to a method for functionalizing a surface (41) of a material obtained from monomer synthesis, characterized in that it comprises a step (201) of projecting a plasma stream and bifunctional precursors (43) at low temperature onto the surface (41), the bifunctional precursors (43) each having a first functional group (44) capable of grafting onto the surface (41) and a second functional group (45) capable of forming a functionalized zone (46) intended to adhere to a layer of adhesive, followed by a step (202) of grafting the first functional group (44) onto the surface (41). (Figure 3)

Description

Title of the invention: Method for functionalizing a plastic surface and method for assembling glazing onto a plastic surface

[0001] The present invention relates to the fields of mechanics and in particular that of automobiles, and more specifically concerns a method of functionalizing a plastic surface and a method of assembling glazing to a plastic surface.

[0002] In what follows, the invention will be described in its automotive application. However, the invention can also be applied in other technical fields where it is necessary to bond glazing to a plastic surface, building construction, aeronautics, the agricultural or leisure sector or the manufacture of various equipment being cited by way of examples.

[0003] In the automotive field, glazing is bonded to a plastic surface, as is the case with a tailgate or any other body opening with an area designed to receive glazing. The surface intended to receive the glazing, that is, the portion where the glazing will be attached, may be made entirely of plastic or be made of any other material and at least partially covered with a plastic coating.

[0004] By plastic material, we mean a thermoplastic material. This type of material has a high molecular weight. This type of plastic also has the advantage of being recyclable. By plastic material, we also mean a thermosetting material, which is composed of linear or branched chains of molecules, giving the plastic hardness and rigidity. It exhibits high mechanical strength and good rigidity.

[0005] Figure 1 schematically represents a method for bonding glazing to a plastic surface according to the prior art. The method for bonding glazing 20 to a plastic surface 21 requires prior preparation of the plastic surface 21 to which the glazing is to be bonded. This surface preparation phase includes a surface cleaning step (not shown in the figure). This step aims to limit the presence of oily agents and eliminate dust or other pollutants in order to ensure durable strength and therefore long-term reliability of the bond. Next, a plasma treatment step 101 takes place, resulting in localized deterioration 22 of the plastic surface 21. This plasma treatment step is carried out using a plasma torch 30 comprising a chamber 31 in which an uncontrollable electric arc is created between two Electrodes 32, 33. After the creation of this electric arc, a gas passes into the chamber and exits the torch ionized, that is, in the form of a collection of ions and electrons. This flow 34, called the plasma flow, with a temperature of approximately 200 to 1550 °C, impacts the plastic surface, locally damaging the area of ​​the surface impacted by the flow. A treated area 22 is thus formed on the surface 21. The next step in the bonding process is the deposition of a primer layer 23 (step 102) onto the treated area 22 following the plasma treatment step 101. The damage to the plastic surface, due to surface irregularities, increases the adhesion of the primer layer 23 to this surface.A layer of adhesive is deposited on the glazing 20 to form an adhesive bead, which is generally applied to the glazing automatically by a fixed gluing nozzle and by means of a movement of the glazing, attached to its support and guided by a fixed, multi-articulated robot. The adhesive bead carried by the glazing 20 is then brought against the treated area 22. Thus, after several steps, the glazing 20 is bonded to the plastic surface 21.

[0006] Figure 2 schematically represents an assembly of a glazing unit 20 on a plastic surface 21 according to the prior art. This assembly therefore comprises a superposition, in this order, of the plastic surface 21 including the treated area 22 exhibiting its surface irregularities, the primer layer 23, the adhesive layer 24, and the glazing unit 20.

[0007] In particular, such a prior art assembly process relies on the deposition of the primary layer 23 which ensures a good level of mechanical bond with the glue 24.

[0008] It is therefore understood that in prior art glazing bonding solutions, it is necessary to use a primer, which is essential in the bonding process on a plastic surface. Such a primer allows the plastic polymer and the adhesive to bond. However, the primers used in industry are solvated primers containing a solvent. The solvent is generally derived from hydrocarbons, typically of the aromatic type, which can lead to risks such as discomfort or eye or respiratory irritation if misused.

[0009] It follows that during the step of depositing the bonding primer layer, it is imperative to comply with the recommendations for use for handling this product.

[0010] Furthermore, the operator must work in a protected environment, i.e., under an extraction hood while wearing personal protective equipment (goggles, gloves, mask). In addition, the primer is generally packaged in an aluminum bottle-type container. On the one hand, it is necessary to shake the The bottle should be opened a few minutes before use, adding an extra step to the bonding process. Furthermore, the primer containers must be handled carefully and disposed of using appropriate handling procedures, similar to those for chemical waste.

[0011] The invention aims to improve prior art bonding processes by proposing an innovative process for treating a plastic surface limiting the use of chemicals to what is necessary, without manual deposition, and presenting a reduced number of steps.

[0012] To this end, the invention relates to a method of functionalizing a surface of a material from a synthesis of monomers comprising a step of projecting a plasma flow and bi-functional precursors at low temperature onto the surface, the bi-functional precursors each having a first functional group capable of grafting onto the surface and a second functional group capable of forming a functionalized zone intended to attach a layer of glue, followed by a step of grafting the first functional group onto the surface.

[0013] Thanks to these characteristics, the surface is functionalized to allow, in a second step, for good bonding of the glazing. Since the surface properties are partly defined by the portion located at the interface between the surface and the external environment, modification of this surface portion must be given particular attention. Therefore, the adhesive and sealing properties require strict control of surface modifications. Functionalizing the surface by anchoring the bifunctional precursors within it, without damaging the surface, provides a bonding base for the adhesive.

[0014] Advantageously, the step of projecting the plasma flow and bifunctional precursors is carried out at a temperature between 25 °C and 300 °C. This operation, performed at a low temperature, ensures that the surface to be functionalized is not damaged. Similarly, the integrity of the bifunctional precursors is also preserved.

[0015] In one embodiment of the invention, the material resulting from a synthesis of monomers comprises polypropylene, preferably loaded with glass fibers or flax fibers.

[0016] In other embodiments, the material resulting from a synthesis of monomers can be any other plastic material, for example polyethylene, polycarbonate, acrylonitrile butadiene styrene, acrylonitrile styrene acrylate, acrylonitrile styrene acrylate polycarbonate, acrylonitrile butadiene styrene polycarbonate, or a glass fiber reinforced polyester resin.

[0017] In the functionalization process according to the invention, the precursors are chosen from (3-aminopropyl)triethoxysilane, N-(3-trimethoxysilylpropyl)diethylenetriamine, 3-(trimethoxysilyl)propyl methacrylate.

[0018] These precursors offer dual compatibility: firstly, the first functional group is compatible with the chemical nature of the surface to be functionalized, and secondly, the second functional group is compatible with the chemical nature of the adhesive intended to be deposited on the subsequently functionalized area. The precursors, compatible both with the plastic surface and with the adhesive, form a chemical bond between the surface and the adhesive.

[0019] The invention also relates to the use of such a functionalization process to functionalize a surface of a material obtained from a synthesis of monomers.

[0020] The invention also relates to a method of assembling a glazing and a material from a synthesis of monomers having a surface on which the glazing is intended to be assembled, the assembly method comprising the steps of the functionalization process described above, as well as a step of depositing a layer of glue on the glazing, in particular at a peripheral edge of the glazing, and a step of moving the glazing so as to place the layer of glue against the functionalized area.

[0021] Similarly, the invention relates to a method of assembling a glazing comprising a material surface resulting from a synthesis of monomers with a support, in particular of the type of a frame, on which the glazing is intended to be assembled, the assembly method comprising the steps of the functionalization process described above, and a step of depositing a layer of glue on the functionalized area of ​​the surface of the glazing, and a step of moving the glazing so as to place the layer of glue against the support.

[0022] Also, the invention relates to a method of assembling a glazing comprising a surface of material resulting from a synthesis of monomers with a support comprising a surface of material resulting from a synthesis of monomers, on which the glazing is intended to be assembled, the assembly method comprising the steps of the functionalization process described above, a step of depositing a layer of glue on the functionalized area of ​​the surface of the glazing, and a step of moving the glazing so as to place the layer of glue against the functionalized area of ​​the support.

[0023] Thanks to these characteristics, the assembly process is particularly advantageous from an industrial point of view since it does not require a step of depositing a primer layer, this adhesion being achieved here by the precursors of the functionalized area. The assembly process of the invention therefore requires fewer steps than a prior art assembly process. Moreover, by dispensing with the application of a primer layer, the process The assembly method of the invention makes it possible to limit the use of chemicals during the factory manufacturing stages.

[0024] The adhesive may be a polyurethane adhesive, preferably one-component or two-component. These types of adhesives exhibit strong adhesion and good environmental resistance due to their good chemical resistance.

[0025] The invention also relates to a part having a surface made of a material resulting from the synthesis of monomers and bifunctional precursors, each having a first functional group grafted onto the surface and a second functional group forming a functionalized zone. By way of non-limiting example, such a part could be a vehicle tailgate onto which glazing is to be bonded.

[0026] The invention also covers an assembly comprising glazing and such a part, the assembly comprising a layer of adhesive deposited on the glazing, the adhesive layer carried by the glazing being disposed on the functionalized area. This could be a tailgate onto which the glazing is bonded. It could be a side door panel onto which the glazing is bonded. It could be a section of the body onto which the glazing is bonded.

[0027] The invention also relates to an assembly comprising a glazing and a part each having a surface of a material resulting from a synthesis of monomers and bi-functional precursors each having a first functional group grafted onto the surface and a second functional group forming a functionalized zone.

[0028] Similarly, the invention also relates to such an assembly comprising a layer of glue deposited on the glazing and / or on the part, the layer of glue carried by the glazing and / or the support being disposed on the functionalized area.

[0029] Finally, the invention relates to a vehicle comprising such an assembly, the part preferably being a tailgate.

[0030] Other features and advantages of the invention will become apparent from the following description on the one hand, and from several illustrative and non-limiting examples of embodiments given with reference to the accompanying schematic drawings on the other hand, in which:

[0031] [Fig. 1] schematically represents a method for bonding glazing to a plastic surface according to the prior art,

[0032] [Fig.2] schematically represents an assembly of glazing on a plastic surface according to the prior art,

[0033] [Fig.3] schematically represents a method for functionalizing a plastic surface according to the invention,

[0034] [Fig.4] schematically represents a part having a surface made of plastic with bi-functional precursors forming a functionalized zone according to the invention,

[0035] [Fig.5] schematically represents a method for assembling a glazing unit and a plastic surface according to the invention,

[0036] [Fig.6] schematically represents an assembly comprising a glazing unit assembled with the plastic surface according to the invention,

[0037] [Fig.7] schematically represents an assembly comprising a glazing unit assembled with the plastic surface according to the invention detailing an example of an embodiment of the functionalized area.

[0038] The features, variants, and different embodiments of the invention, as described or as they will be presented in the detailed description that follows, can be combined in various ways, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of features described hereafter in isolation from the other described features, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from the prior art.

[0039] For the sake of clarity, the same elements are designated by the same references in the different figures.

[0040] Fig. 1 schematically represents a method of bonding glazing to a plastic surface according to the prior art and has been described previously.

[0041] Fig. 2, already presented, schematically represents an assembly of glazing on a plastic surface according to the prior art.

[0042] Figure 3 schematically represents a method for functionalizing a plastic surface according to the invention. The functionalization method is implemented to prepare the surface for bonding glazing to it.

[0043] The surface 41 to be functionalized is made of a material resulting from the synthesis of monomers. In the context of the invention, this surface 41 is at least partially made of plastic, such as, for example, polypropylene, preferably reinforced with glass fibers or flax fibers. Reinforcing polypropylene with glass fibers makes it lighter and more wear-resistant. Reinforcing polypropylene with flax fibers improves its mechanical properties.

[0044] In other words, the surface may be made entirely of plastic, as is the case with a part made entirely of polypropylene, or it may be made of any other material and at least partially covered of a plastic coating. In the latter case, the functionalization process is applied to a surface of the plastic coating.

[0045] The process for functionalizing the surface 41 includes a step 201 of projecting a plasma flow and bi-functional precursors 43 at low temperature onto the surface 41. The bi-functional precursors 43 each have a first functional group 44 suitable for grafting onto the surface 41 and a second functional group 45 suitable for forming a functionalized area 46 intended to adhere to a layer of glue.

[0046] The plasma and precursor projection step is carried out using a dielectric barrier discharge plasma torch 50. The torch comprises a chamber 51 through which a gas (for example, nitrogen) charged with precursors 43 flows. The precursors 43 are advantageously stored in liquid form near the torch and vaporized into the gas stream by means of a feed device provided for this purpose. The torch is equipped with two electrodes 52, 53. By establishing a significant potential difference between the two electrodes placed in the gas, the latter can ionize and allow a current to flow: this is an electrical discharge. A dielectric material 54 is placed around one or both of the electrodes 52, 53. The presence of this material limits the occurrence of breakdown or uncontrollable arcing. Such a torch makes it possible to generate a so-called dielectric barrier discharge.In other words, a plurality of small, controllable arcs are formed thanks to the dielectric barrier. Thus, the precursor-laden gas passes into the chamber and exits ionized. This configuration has the advantage of forming small arcs with much lower energy than those of the prior art. Consequently, the temperature of the projected flux is not very high and does not damage the precursors. Similarly, thanks to this low-temperature flux, the surface 41 is not damaged. This is referred to as the projection of a plasma flux and precursors 43 at low temperature, since the temperature of this flux is between 25°C and 300°C.

[0047] After step 101 of projecting the plasma flow and the precursors 43, the functionalization process according to the invention comprises a step 202 of grafting the first functional group 44 onto the surface 4L. As described previously, each precursor 43 is bi-functional, that is, it comprises two functional groups. The first functional group 44 is intended to graft the precursor onto the surface 4L. The first functional group 44 serves to anchor the precursor in the surface 4L. The second functional group 45, oriented towards the outside of the surface 41, forms a functionalized zone 46 for the purpose of interacting with the adhesive.

[0048] The judicious combination of the low-temperature plasma flow and its loading with bi-functional precursors makes it possible to create precursor grafts on the surface to obtain the functionalized zone which will serve as an adhesion zone for the glue, without damaging the precursors or the surface. Steps 201 and 202 of the functionalization process according to the invention thus allow molecules or materials of interest to be grafted onto the surface 41 of the coating or part, through their covalent coupling with other chemical functionalities. The plastic surface 41 serves as a base for the grafted precursors. In other words, the precursors 43 are attached to the molecules of the plastic surface by their first functional group 44 in an anchoring zone 42. Once anchored to the plastic surface, the precursors form, at their second functional group 45, the functionalized zone intended to receive the adhesive for bonding the glazing. The precursors act as the bonding medium between the adhesive and the plastic surface.Their first functional group attaches to the plastic surface, and their second functional group provides a site for receiving glue that has a strong chemical affinity with the glue.

[0049] Figure 4 schematically represents a part 70 having a plastic surface with bifunctional precursors forming a functionalized zone according to the invention. The part 70 has a surface made of a material resulting from the synthesis of monomers and bifunctional precursors 43, each having a first functional group 44 grafted onto the surface 41 and a second functional group 45 forming the functionalized zone 46. The part 70 is obtained by implementing the functionalization process as described above. The first functional groups 44 are anchored in the anchoring zone 42 of the surface 41, and the second functional groups 45 constitute the functionalized zone 46. Such a part is intended to receive a layer of adhesive on the functionalized zone 46, the adhesive layer having been previously deposited on the glazing 60.

[0050] Note that the invention is described in the case of an assembly of glazing on a plastic surface, however the functionalization process and the part 70 obtained by this process can very well be used to carry out the bonding of another element on the surface 41, provided that a layer of glue compatible with the element to be bonded is applied.

[0051] The functionalization process according to the invention can be used to functionalize a surface of a material produced by monomer synthesis, intended to adhere to a layer of adhesive, just before the glazing bonding phase. Alternatively, the functionalization process can be used to obtain a series of parts 70 for storage and later use.

[0052] Figure 5 schematically represents a method for assembling glazing and a material resulting from the synthesis of monomers, for example polypropylene, presenting a surface intended to receive the glazing according to the invention. The glazing 60 is therefore intended to be assembled onto the surface. The assembly process comprises the steps of the functionalization process as described above. The functionalization process allows the anchoring of the first functional groups 44 in the anchoring zone 42 of the surface 4L. The second functional groups 45 extend from the surface 41 towards the outer part of the surface 41 and constitute the functionalized zone 46 intended to receive the adhesive.

[0053] After step 202 of anchoring the precursors in the surface 41, the assembly process includes a step 204 of depositing a layer of glue 47 on the functionalized area 46, the layer of glue 47 having been previously deposited on the glazing 60 during a previous step (step 203).

[0054] Thanks to the presence of the second set of functional groups, the functionalized area 46 forms an adhesive bonding zone. In other words, the precursors 43 anchored in the surface 41 ensure the adhesion of the adhesive to the surface. Combined with the adhesive layer, the precursors 43 grafted into the anchoring zone 42 thus form the bond between the glazing 60 and the surface 4L

[0055] Advantageously, the assembly method of the invention is implemented to assemble the peripheral areas of the glazing onto the plastic surface defining the opening. Step 201, in which the precursor-laden plasma stream is projected onto the plastic surface surrounding the tailgate opening, is used. After step 202, in which the precursors are anchored to the surface, the perimeter of the opening forms a functionalized area onto which a layer of adhesive (step 204) can be applied, either manually or, preferably, automatically. A bead of adhesive is first applied around the perimeter of the glazing (step 203). The glazing can then be positioned so that its peripheral areas come into contact with the functionalized area via the bead of adhesive.

[0056] In addition to ensuring high-quality glazing bonding, this process involves fewer steps compared to prior art bonding methods and reduces operator intervention, particularly due to the absence of a primer. Furthermore, the use of precursors allows for control over the quantity of chemicals used. The invention guarantees a durable bond that meets stringent quality criteria, especially in terms of pull-out resistance, aging, and sealing, while keeping implementation costs down.

[0057] Figure 6 schematically represents an assembly 80 comprising a glazing 60 assembled to the plastic surface 41 according to the invention. The surface 41 includes the anchoring zone 42 in which the first functional groups of the precursors are anchored to perform the grafting of the precursors into the surface 4L It should be noted here that the anchoring zone 42 shows no local deterioration. The functionalized zone 46 is formed by the second functional groups 45 of the precursors, themselves anchored in the surface 41. A layer of adhesive 47 is deposited on the functionalized zone 46. The adhesive 47 is thus bonded to the second functional groups 45 of the precursors. The glazing 60 is deposited on the adhesive layer 47. The assembly thus consists of the superposition, in this order, of the plastic surface 41, the precursors 43, the adhesive layer 47, and the glazing 60.

[0058] Polyurethane adhesives are made from polymers and various chemical compounds. They harden upon contact with heat and atmospheric humidity during a crosslinking phase. Polyurethane adhesives have the advantage of exhibiting very high adhesion.

[0059] In the assembly process of the invention, the adhesive 47 can be a one-component polyurethane adhesive. This adhesive contains isocyanate functional groups. Among its advantages are excellent mechanical performance due to high adhesion strength and good environmental resistance due to its good chemical and thermal resistance. This type of adhesive is also easy to apply because no prior mixing is required, unlike two-component polyurethanes.

[0060] Alternatively, the adhesive 47 can be a two-component polyurethane adhesive. This two-component polyurethane adhesive comprises polyols and polyisocyanates or urethane prepolymers mixed just before application. The two components are the resin and the hardener. The advantages of a two-component polyurethane adhesive include, among others, a strong bond that increases the durability of the bond, better chemical resistance than a one-component polyurethane adhesive, and compatibility with an automated dispensing process for improved productivity.

[0061] The invention also relates to a vehicle comprising such an assembly 80, the part 70 being preferably a tailgate.

[0062] Figure 7 schematically represents an assembly comprising a 60 glazing assembled to the plastic surface 41 according to the invention, detailing an example of an embodiment of the functionalized area. According to the invention, the precursors 43 are selected from: • (3-aminopropyl) triethoxysilane (APTES, CAS 919-30-2), • N-(3-trimethoxysilylpropyl) diethylenetriamine (TRIAP, CAS 35141-30-1), • 3-(trimethoxysilyl)propyl methacrylate (TMSMA, CAS 2530-85-0).

[0063] In the embodiment illustrated in [Fig. 7], the precursor is (3-aminopropyl)triethoxysilane (APTES, CAS 919-30-2). The first functional group 44 The first functional group is the triethoxysilane group, which is compatible with the chemical nature of surface 41, and the second functional group 45 is the 3-aminopropyl group. As shown schematically, the oxysilanes are grafted onto surface 41. This grafting of the oxysilanes onto the branched chains of the plastic material ensures the anchoring of the precursors 43 in surface 41. The second functional group 45, the 3-aminopropyl group, is compatible with the chemical nature of the adhesive 47.

[0064] Through this illustration, it is clear that the bonding between the glazing 60 and the surface 41 is achieved through the bi-functional chemical bond involving the precursors which serve as a binder between the surface and the glue.

[0065] The method for assembling glazing and a plastic surface according to the invention thus meets the dual objective of limiting the use of chemicals in the factory, for example during the manufacture of tailgate-type parts, and reducing the number of steps required before the adhesive application stage for bonding the glazing. The limitation of chemical substances results from the reduction of chemical packaging to be recycled or treated. The limitation of chemical substances also stems from the use of a single, specific, two-component chemical precursor, as opposed to the traditional use of numerous chemical compounds in a more generic primer that would work for several applications.

[0066] Of course, the invention is not limited to the examples just described, and many modifications can be made to these examples without departing from the scope of the invention. In particular, the features of different embodiments of the invention can be combined to carry out the invention, provided that these embodiments are not incompatible with each other.

Claims

Demands

1. A method for functionalizing a surface (41) of a material obtained from a synthesis of monomers, characterized in that it comprises a step (201) of projecting a plasma flow and bifunctional precursors (43) at low temperature onto the surface (41), the bifunctional precursors (43) each having a first functional group (44) capable of grafting onto the surface (41) and a second functional group (45) capable of forming a functionalized zone (46) intended to attach a layer of glue, followed by a step (202) of grafting the first functional group (44) onto the surface (41).

2. Functionalization method according to claim 1, wherein the step (201) of projecting the plasma flow and bifunctional precursors (43) is carried out at a temperature between 25 °C and 300 °C.

3. Functionalization process according to claim 1 or 2, wherein the material from a synthesis of monomers comprises polypropylene, preferably loaded with glass fibers or flax fibers.

4. A functionalization process according to any one of claims 1 to 3, wherein the precursors (43) are selected from (3-aminopropyl)triethoxysilane, N-(3-trimethoxysilylpropyl)diethylenetriamine, 3-(trimethoxysilyl)propyl methacrylate.

5. Use of the functionalization process according to any one of claims 1 to 4 to functionalize a surface of a material from a synthesis of monomers intended to adhere to a layer of glue.

6. Method of assembling a glazing (60) and a material from a synthesis of monomers having a surface on which the glazing (60) is intended to be assembled, the assembly method comprising the steps of the functionalization process according to any one of claims 1 to 4, a step (203) of depositing a layer of adhesive (47) on the glazing (60), in particular at a peripheral edge of the glazing (60), and a step (204) of moving the glazing so as to place the layer of adhesive (47) against the functionalized area.

7. Method of assembling a glazing (60) comprising a surface of material resulting from a synthesis of monomers with a support, in particular of the type of a frame, on which the glazing (60) is intended to be assembled, the assembly method comprising the steps of the functionalization process according to any one of claims 1 to 4, a step (203) of depositing a layer of adhesive (47) on the functionalized area of ​​the surface of the glazing (60), and a step (204) of moving the glazing so as to place the layer of adhesive (47) against the support.

8. Method of assembling a glazing (60) comprising a surface of material from a synthesis of monomers with a support comprising a surface of material from a synthesis of monomers, on which the glazing (60) is intended to be assembled, the assembly method comprising the steps of the functionalization process according to any one of claims 1 to 4, a step (203) of depositing a layer of adhesive (47) on the functionalized area of ​​the surface of the glazing (60), and a step (204) of moving the glazing so as to place the layer of adhesive (47) against the functionalized area of ​​the support.

9. Assembly method according to at least one of claims 6 to 8, wherein the glue (47) is a polyurethane glue, preferably one-component or two-component.

10. Part (70) having a surface of a material from a synthesis of monomers and bi-functional precursors (43) each having a first functional group (44) grafted onto the surface (41) and a second functional group (45) forming a functionalized zone (46).

11. Assembly (80) comprising a glazing (60) and a part (70) according to claim 10, the assembly comprising a layer of adhesive (47) deposited on the glazing (60), the layer of adhesive (47) carried by the glazing being disposed on the functionalized area (46).

12. Assembly comprising a glazing (60) and a part (70) each having a surface of a material from a synthesis of monomers and bifunctional precursors (43) each having a first functional group (44) grafted onto the surface (41) and a second functional group (45) forming a functionalized zone (46).

13. 14 Assembly (80) according to claim 12, characterized in that it comprises a layer of glue (47) deposited on the part (70), the layer of glue (47) carried by the support being disposed on the functionalized area (46).

14. Vehicle comprising an assembly according to any one of claims 11 to 13, part (70) preferably being a tailgate.

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