JPH0432790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a novel safety window glass, and more particularly to a safety window glass used as an automobile windshield.

Although the following description will be made with reference to a vehicle windshield, it should be understood that the present invention is applicable to safety glazings that may be installed in any window aperture in a vehicle or building.

<Prior Art> Windshields currently in use are laminate-type safety windows formed from two or more glass sheets bonded together by one or more intermediate sheets of plastic. The sheet is generally a sheet made of polyvinyl butyral.

For the sake of simplicity, the following description will only refer to laminated glazings. That is, a glazing is described which comprises two sheets of glass glued together by an intermediate sheet of plastic. However, other types of laminated glazing are also within the scope of the invention.

Although other plastic materials can be used for this application, the currently commonly used polyvinyl butyral is known to be sensitive to moisture. As water vapor diffuses over the edge of the window pane into the intermediate sheet, the plastic material forming the intermediate sheet absorbs the water. This will reduce the adhesion of the intermediate sheet to the glass. Furthermore, a phenomenon appears around the window glass that makes the window glass opaque. This water absorption may occur before the window glass is installed on the vehicle body, for example during transportation from the factory to the installation site, or during storage. However, unless measures are taken to ensure that the impermeability around the edges of the glazing fitted to the body is sufficient to prevent water ingress, the diffusion of water may also occur if the glazing is already attached to the body. It will occur even when installed. For example, in the tropics, laminated windshields are subjected to very severe conditions in this regard. Thus, in hot and humid countries, the effects of said non-adhesion and opacity are greater.

<Object of the invention> The present invention provides a window glass with an edge made as impermeable as possible to moisture that may enter the plastic intermediate sheet before and after the installation of the windshield on the body of a vehicle. , especially aimed at providing laminated windshields. It also provides an impermeable sealing method which makes it possible to easily place the pane in the hole in the body, especially when installing by bonding.

<Structure of the Invention> The foregoing object of the present invention is to comprise two glass sheets adhered to each other by an intermediate sheet of plastic, the edge of the glass sheet facing inward of the vehicle and the intermediate sheet. The edges of the outer glass sheet are spaced inwardly from the edges of the outer glass sheet to form a stepped structure, and the intermediate sheet has the same or smaller dimensions as the inner glass sheet, especially for automotive applications. A laminated glazing for a windshield, in which an adhesive band is arranged in a stepped section formed between the edge of an outer glass sheet and an edge of an inner glass sheet, and a perimeter of opaque material is provided. a strip is disposed around the inner surface of the outer glass sheet and between the adhesive band, the adhesive band being made of a material that prevents the diffusion of water vapor into the intermediate sheet, and the strip is located at the edge of the inner glass sheet; This is achieved by a laminated glazing, which is characterized in that it has dimensions such that it makes contact with the glazing and lends itself to installation as a vehicle glazing.

Further, in accordance with the present invention, a peripheral strip or elongated sheet of ultraviolet opaque material is mounted around the interior surface of the large-sized glass sheet, ie, the glass sheet facing the outside of the vehicle. A continuous band is then disposed on this strip in said stepped portion, said continuous band being of an adhesive material which prevents the diffusion of water vapor into the intermediate sheet. The dimensions of the band are such that, during the installation of the windshield on the body, it serves to be fixed by gluing to the fold of the metal sheet of the body provided for this purpose. It is essential that the band touches the edge of the inner glass sheet to ensure the desired sealing.

It is possible to place an adhesive band directly on the stepped section after manufacturing the windshield in the factory. In this way it is immediately possible to ensure complete impermeability of the plastic intermediate sheet from the outside world. In this way, not only is it possible to avoid any deterioration of the intermediate sheet due to the possible absorption of water during transport and storage, but also at least the smaller glass sheet with respect to the edge of the window pane is protected. It turns out.
The foregoing protection is particularly beneficial since smaller glass sheets are generally thinner and therefore more susceptible to mechanical damage.

Since the band serves to attach the glazing in the bore of the body by gluing, it should extend beyond the smaller glass sheet in the thickness of the glazing. Using such a structure, the bands serve as spacers when stacking the panes, which is further beneficial.

The present invention also provides for a step between two glass sheets that is filled with an adhesive extending beyond the glass sheets of small dimensions, the depth of the metal fold of the body for receiving the pane. This has the advantage of allowing a reduction in In fact, it is necessary to use a minimum adhesive thickness to ensure a strong bond between the glazing and the body.

According to the invention, for a given thickness of adhesive, the depth of the fold will be reduced by the total thickness of the intermediate sheet and the inner glass of the window pane. This is not only economical for metal seats, but also increases the possible viewing angles for the driver.

In a preferred embodiment of the invention, the adhesive band is covered with a protective sheet, for example paper, which is torn off just before attaching the window glass to the body.

The strip of opaque material disposed around the periphery of the inner surface of the outer glass sheet of the window pane may comprise, for example, a layer of enamel which is printed onto the glass and then baked. This strip has the advantage that it not only hides the adhesive band it covers from outside observers, but also further improves the adhesion of the adhesive band to the glass sheet.

<Example> The present invention will be described in detail below with reference to the accompanying drawings.

The laminated glass glazing shown in FIG. 1 comprises a glass sheet 1 which, after installation, forms a glass sheet facing outward, and a glass sheet 2, which after installation forms a glass sheet facing inward of the vehicle. Glass sheet 2 is generally thinner than glass sheet 1. The two glass sheets 1, 2 are glued together by an intermediate sheet 3 of plastic material. The glass sheet 2 is smaller than the glass sheet 1, so that between the edge 5 of the glass sheet 1 and the edge 4 of the glass sheet 2 there is a separation area of approximately 1-2 cm. The plastic material made of polyvinyl butyral or other comparable material has the same dimensions as the glass sheet 2 and their edges are coplanar.

On the surface of the glass sheet 1 facing the intermediate sheet 3, which extends beyond the boundaries of the glass sheet 2, an opaque layer 7, for example a thermosetting black paste, is arranged. Pastes suitable for this purpose are commercially available. Among the available pastes, one is selected that has good adhesion to the adhesive used. If required, before applying the paste to the glass sheet,
It is possible to mix pastes with adhesives in a known manner to improve adhesion. The paste is applied by known methods, such as silk screen printing. A preferred embodiment of the invention uses a paste that is applied to the glass sheet before bearing and heated during its operation by the required high temperatures.

The step portion delimited by the edge 4 and the layer 7 of the glass sheet 2 is filled with an adhesive band 10, which is e.g. It is preferable to inject directly into this space using A base layer, ie an adhesive primer, may be applied on top of the opaque layer 7 before placing the adhesive band. This adhesive material is applied in order to obtain a band 10 which extends in the thickness direction beyond the surface of the glass sheet 2 and serves to secure the window glass directly to the body of the vehicle. Preferably, this adhesive band is made of a material that retains the ability to plastically deform for a period of time and hardens only after inserting the windshield into the window hole. Such a result may be obtained, for example, by covering the adhesive band with an air-tight protective sheet 12 after it has been placed.

The adhesive band 10 may also be constructed of a material that hardens after installation, but is preferably re-softened prior to installation on the windshield. For example, it may be made of a thermoplastic material that is heated to its softening temperature before being attached to the windshield. It is also possible to use adhesives that can be softened or activated by treatment with plasticizers or solvents.

Before installing the windshield in the hole, by a method specially adapted for the arrangement of such a windshield, on the folded part of the metal sheet provided for receiving the windshield or on the adhesive band itself. It is possible to arrange a layer of glue that plasticizes and adheres to the adhesive band, so that the plastic glue layer,
A durable air-tight connection will be formed between the adhesive band and the folded portion of the body hole.

The embodiment shown in FIG. 5 allows a better and more advantageous method for fixing the window pane in the bore of the body. As shown in FIG.
It consists of: An opaque layer 7 is disposed on the surface of the sheet 1 as described in connection with FIG. A layer is also placed on the edge of the glass sheet 2 to hide the adhesive band 30 as a whole. An adhesive primer 29 as described in US Pat. No. 3,779,794 is placed on top of the opaque layer 7.
In this embodiment, the adhesive band 30 has a special shape, partially covering the surfaces of the two glass sheets 1 and 2, and having two tongues 27 in the direction of the inside of the vehicle. It has 28. The adhesive band is made of a material that hardens very quickly after placement, such as a polyurethane prepolymer.

The adhesive band thus serves as an intermediate member for the subsequent placement of the pane into the hole. Said tongues 27, 28 at the moment of placement in the bore of the body
In between, another band portion compatible with the first portion is placed, for example by an extrusion process. Due to the presence of the tongues 27 and 28, the layers of the second part that are arranged are limited and economies of material consumption are achieved. The time required for installation is also reduced. For example, for a band having the same thickness as that used in the embodiment described in connection with FIG. be done. This smaller amount of material allows for faster drying.

This embodiment may also have other variations not shown. The portion of the band provided with the tongue may, for example, not extend over the two glass sheets but remain at the edge of the inner glass sheet. It is also possible to arrange a first band in which a single tongue is provided and which is placed towards the inside of the window pane and serves to avoid overflow of the second band.

In the embodiment shown in FIG. 2, the intermediate sheet 13 has dimensions smaller than the dimensions of the glass sheet 2. In the embodiment shown in FIG. The edge of the intermediate sheet 13 is separated from the edge 4 of the glass sheet 2 by a few mm. This results in the formation of a groove between the periphery of the intermediate sheet 13 and the two glass sheets 1, 2, into which groove a portion of the adhesive band 20 penetrates. The presence of this groove thus ensures a particularly good air-tightness of the intermediate sheet 13 to the surrounding atmosphere, while the adhesive, which also serves the purpose of an air-tight bond, penetrates between the two glass sheets.

The material forming band 20 is selected according to the same criteria as the embodiment of FIG.

The laminate glazing shown in FIG. 3 also comprises a first outwardly facing glass sheet 1 and a second glass sheet facing inwardly of the vehicle bonded by an intermediate sheet 13 of plastic. Said intermediate plastic sheet 13 is smaller than the second glass sheet. Note that the glass sheet 2 is smaller than the glass sheet 1. On the inner surface of the glass sheet 1, which extends beyond the glass sheet 2, an opaque layer 7, for example black enamel, is arranged. The surface of the glass sheet 2 facing inward of the vehicle is covered with a protective sheet 8 made of flexible transparent polyurethane having self-sealing properties for protection against glass shattering. The adhesive band 20 is
It is located in a free space or step delimited by the edges of glass sheet 2 and the edges of glass sheet 1. This adhesive band also penetrates into the groove 14 which is present due to the reduced dimensions of the intermediate sheet 13 relative to the glass sheet 2.

In this embodiment, the invention has an additional advantage which is of decisive importance for mounting this type of windshield by simple gluing. Before applying the adhesive band 20 it is possible to apply a not shown base layer, ie adhesive pliers, to the opaque layer 7, so that without the adhesive band 20 the base layer would come into contact with the protective sheet 8. Become. As shown in FIG. 3, the protective sheet 8 does not contact any layer disposed on the glass sheet 1.

It is known that when the base layer and the protective layer 8 come into contact, the base layer has a very negative effect on the protective layer 8, and in the known manner, when the two glass sheets have the same dimensions, contact is not practical. cannot be avoided.

The windshield according to the invention is particularly suitable for flush mounting on the body without introducing additional partial materials or decorative elements covering the edges of the windshield. Since the layer 7 itself covers the adhesive layer, there is no need to provide decoration from the outside. However, since the edges 5 of the glass sheet 1 are visible, it is desirable to give them a rounded cross-section.

FIG. 4 shows the windshield attached by adhesive to the hole in the body. To attach the windshield, a relatively thin layer 24 made of a solvent-containing adhesive is applied to the metal sheet fold 22 of the body. During installation, when the adhesive band comes into contact with this layer 24, the adhesive band and layer 24 interact so that the band becomes softer and thus accommodates the unavoidable irregularities in layer 24. It turns out. After curing, adhesive band 20 forms a durable bond with layer 24. In order to close the gap existing between the windshield and the part of the sheet 25 of the body, an elastic hollow joint member 26 is inserted between them.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the laminated window glass according to the present invention, and FIGS. 2 and 3 are cross-sectional views showing other embodiments of the laminated window glass according to the present invention, respectively. FIG. 4 is a sectional view showing a windshield formed from a laminated glass according to the invention after being installed in a hole in an automobile body, and FIG. 5 is a further embodiment of the laminated window glass according to the invention. . 1... Outer glass sheet, 2... Inner glass sheet, 3, 13... Plastic intermediate sheet,
4, 5... Edge of glass sheet, 7... Opaque layer, 8... Protective sheet, 10, 20, 30... Adhesive band, 25... Body sheet.

Claims (1)

[Scope of Claims] 1 Consisting of two glass sheets 1 and 2 bonded to each other by intermediate sheets 3 and 13 made of plastic, the edge of the glass sheet 2 facing inside the vehicle and the intermediate The edges of the sheets 3, 13 are spaced inwardly from the edge of the outer glass sheet 1 to form a stepped structure, and the intermediate sheets 3, 13 are the same as the inner glass sheet 2. or in laminated glazings with small dimensions, in particular for automobile windshields, an adhesive band 10, 20, 30 are arranged, and a peripheral strip 7 of opaque material is arranged between the periphery of the inner surface of the outer glass sheet 1 and the adhesive band, said adhesive band preventing the diffusion of water vapor into the intermediate sheet. 1. A laminated glazing, characterized in that it is made of a material that prevents the glazing and has dimensions such that it contacts the edges of the inner glass sheet 2 and is useful for installation as a vehicle glazing. 2. Pane according to claim 1, characterized in that the strip (7) is made of enamel, which is preferably arranged by silk-screen printing. 3. The enamel used is adhesive band 10, 2
Claim 2 characterized in that it has stronger adhesion performance to glass than 0.30.
Window glass as described in section. 4. Claims 1 to 3, characterized in that the adhesive band 10, 20, 30 is made of a synthetic material, which has the ability to be reactivated before installing the glazing on the body of the vehicle. The window glass described in any one of Item 3. 5. Said strip 7 is covered with an adhesive primer 29, and an adhesive band 30 covers the circumference of the glass sheet 2 and is made of a material that hardens rapidly after placement and extends towards the inside of the vehicle. Claim 1, characterized in that it has two tongue-like parts 27, 28 and serves as an intermediate member for installing the window pane in the bore by fastening.
The window glass according to any one of Items 1 to 4. 6. characterized in that the plastic intermediate sheet between the two glass sheets 1, 2 is smaller than the glass sheet 2, so that a groove 14 is formed into which a part of the adhesive band 20 can enter. A window glass according to any one of claims 1 to 5. 7. The windowpane according to any one of claims 1 to 6, wherein the bands 10, 20, 30 are covered with a tearable protective sheet. 8. The window glass according to any one of claims 1 to 7, wherein the edge 5 of the glass sheet 1 has a round cross section. 9 Folding section 22 of the body with an adhesive layer 24 that allows fixing of the window glass in the hole in the vehicle body.
In the method of attaching a window glass to a hole in a vehicle body by gluing, an adhesive layer is applied to the fold 22 and/or the adhesive band 10, 20, 30 of the hole in the vehicle body, and the window glass is inserted into the hole. and the adhesive layer contains a solvent such that the solvent softens the adhesive band to form a durable bond to the adhesive band.