NL8402900A - PRE-MOLDED WINDOW ASSEMBLY AND METHOD OF MANUFACTURING IT. - Google Patents

Description

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Preformed window assembly and method of manufacturing it.

The present invention relates to a window assembly and to a process for producing the assembly. More particularly, the invention contemplates a window assembly, including a sheet of optically S transparent material, such as glass, and a gasket of a polymeric material that is polymerized and cured in situ to encapsulate the peripheral edge portion of the sheet.

The packing is typically formed by a reaction injection molding process. The assembly can be modeled to form, for example, a vehicle windshield, in which case it can be readily inserted to close a windshield opening surrounded by a frame of appropriate model to interact with the gasket of the assembly.

Initially, vehicle windshield assemblies consisted of a number of elements, including adhesive sealants applied around the peripheral edges of the glass plate, suitable mechanical fasteners such as metal clamps, and exterior trim strips applied to the joint between the peripheral edges of the glass. cover the glass plate and the adjacent part of the vehicle frame.

As will be clear, such constructions were expensive in both material and labor *

Subsequently, in an attempt to improve the construction, unitary window assemblies of the type proposed in US Pat. No. 4,072,340 were developed. These assemblies include a glass plate, an adjoining frame, and a shell or gasket of molded material, such as polyvinyl- | 30 chloride, which extends between the frame and the peripheral edge of the window to hold the glass plate and frame together. Fasteners are mounted on spaced plates along the molding so that the entire assembly can be guided in place as a unit over the opening in a vehicle body, the fasteners extending through aligned openings in the vehicle body and secured from inside the vehicle.

Other window assemblies, as proposed in U.S. Patent 4,139,234, include a molded casing or gasket around the edge of the glass pane with mountings formed in the casing or gasket and protruding therefrom for attachment to an associated vehicle body .

The relatively heavy molded parts of the aforementioned assemblies, which are typically cast from zinc or other metals or alloys, and / or the molded gasket or casing for securing the mold to the window is a significant weight in any window assembly. Also, as proposed in U.S. Pat. No. 4,072,340, the exterior trim, which requires fasteners along its length to secure the entire assembly in a vehicle, requires expensive sheathing or packing methods that make the moldings expensive and time consuming. install.

In an effort to reduce the overall weight of a window assembly of the type discussed above and to reduce the cost thereof, other window assemblies of the general types proposed in U.S. Pat. Nos. 3,759,004 and 4,364,595 have been developed. . The construction of the first-mentioned patent comprises a glass plate, with a finishing strip surrounding its edge, which is secured within a suitable framed opening in a vehicle by means of an adhesive between the glass and / or the finishing strip and the adjacent part of the frame is pressed around the opening of the vehicle. The finishing strip is formed of a flexible plastic material with a channel portion, 8402900-3 - enclosing the edge of the glass plate, and a front decorative strip portion that emanates from and hinges relative to the edge of the front wall of the channel portion which is attached to the the inside of the finishing strip lies when it is fitted around the glass plate. The finishing strip can be held in place on the glass plate by suitable spring metal retaining clips, for example.

The last of the aforementioned patents shows another vehicle assembly which, for example, to close a vehicle opening when a unit is preferably installed from the outside. The assembly comprises a glass plate, one of several types of trim or finishing parts surrounding the glass plate, and one or more bonding parts directly attached to the glass plate but hidden from view. Preferably, the fasteners are metal studs which are securely bonded directly to the glass surface with a suitable adhesive. The molding part can be injection molded, as the patent discloses, around the glass plate.

The present invention includes a relatively low weight, low cost window assembly that can be assembled and installed in a vehicle with minimal handling costs.

The present invention relates to a window assembly or glazing and to a method of manufacturing it, wherein the window material, typically a glass plate, bears a surrounding resin mounting or packing member encapsulating the periphery of the glass plate. The mount or gasket member is applied to the periphery of the glass sheet by spraying into a mold cavity surrounding the periphery of the glass sheet a composition which can polymerize and harden therein to produce the gasket; the composition is due to the intervention of the autogenous mechanism associated with the polymer 840 2 9 0 0 *. - 4 - Sation and hardening thereof within the closed mold cavity in intimate contact with the walls forming the mold cavity and with the glass plate. Excellent results have been obtained by forming the mounting part of a polyurethane composition 5 which hardens into a microcellular elastomer.

The process of the present invention subjects the glass or other transparent sheet material to low pressures only, and differs in that respect from processes according to which window assemblies, which have molded plastic moldings, have hitherto been performed by, for example, injection molding using a thermoplastic material such as polyvinyl chloride or the like is injected into contact with the surface of the window material at particularly high pressures, which typically range from 350 to 1500 kg / cm 2. In many instances, the desired preformed window assemblies include glass sheets that have relatively small irregularities formed therein during the manufacturing process. These irregularities are typically caused by the surface of the glass comprising zones 20 in which the normally flat planar shape is interrupted by a series of small wrinkles formed by a series of adjacent rapid changes in the surface dimensions. In case such glass is used in the injection molding process, significant breakage can be expected. Therefore, the high injection pressures required in the injection molding processes require a considerably high pressure (clamping force) to hold the mold surface against the glass surface. Since the steel surfaces of the molds do not adapt to the irregularities (and cannot be counted on due to the non-repetitive nature of the irregularities), these high pressures often break the glass especially in the zones that contain the irregularities.

The preferred resins for use according to the invention consist of polyurethanes, preferably consisting of the linear or slightly branched polypropylene glycol polyethers and diphenylmethane diisocyates (MDX), which are slightly modified either by carbodimide or by reaction with glycols to form isocyanate compounds, which are liquid at room temperature and low enough in viscosity to meet the process requirements of high pressure measuring and mixing equipment.

The resins are formulated to be polymerized upon injection into the mold cavity where polymerization and curing occur. The reactivity is controlled to provide sufficient polymerization and cell stabilization, with a relatively short molding time sufficient for the assembly being produced.

In this regard, it is noted that, although hardening is possible at room temperature, the mold surfaces are typically maintained at 60 ° to 71 ° C, which temperatures resist layered glass products.

It is an object of the present invention to produce a preformed window assembly, including a glass or other transparent sheet and encapsulating molding of a type of synthetic polymer, such as polyurethane, which polymerizes to adhere in tight sealing relationship with the adjacent glass surface allowing the entire preformed assembly to be installed to close a vehicle or other opening with minimal manipulation.

Another object of the invention is to produce a preformed window assembly that can be installed to close an opening and secured without the need for auxiliary fasteners and finishing strips.

Another object of the invention is to produce a preformed window assembly in which the outer portion of a synthetic polymer encapsulating molding is formed with an outer finishing portion intended to bridge the gap between the 8402900

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- exposed glass surface and the part of the vehicle or the like adjacent to the opening to be closed to form a substantially smooth mount.

The invention is explained in more detail below with reference to one shown in the drawings

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exemplary embodiment thereof.

Figure 1 is a rear view of a preformed window assembly according to the invention; Figure 2 is an enlarged partial sectional view of the assembly of Figure 1 according to II-II in Figure 1; FIG. 3 is an enlarged partial cross-sectional view of the peripheral edge portion of the window assembly of FIGS. 1 and 2 showing the application of a bead of adhesive prior to installation of the assembly; Figure 4 is a partial vertical section of the window assembly of Figures 1, 2 and 3 after it has been installed to close an opening; Figure 5 is a schematic view showing the preferred process for producing the preformed window assembly of Figures 1 through. 4 is shown; Figure 6 is a more detailed schematic representation showing the basic components involved in the practice of the Figure 5 process; Figure 7 is a top plan view of a typical shape calculated to produce the preformed window assembly of Figures 1 to 4; Figure 8 is an enlarged partial sectional view of the mold structure of Figure 7 according to VIII-VIII in Figure 7; FIG. 9 is an enlarged partial sectional view of the vacuum head portion of the mold 8402900

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7 - assembly of figures 7 and 8 according to IX - IX in figure 7; and FIG. 10 is an enlarged partial sectional view showing cooperating pad members for supporting a glass article during the production of a window according to the invention according to the process of FIG. 5; mold cavities in lower and upper mold parts are also shown.

According to the present invention, there is provided a glazing consisting of a transparent sheet material and a gasket formed of a synthetic polymer adhered to certain parts of said sheet, characterized in that said gasket is located locally adjacent to said certain parts of said plate is polymerized and through the autogenous mechanism associated with its polymerization and hardening while entrapped has come into intimate contact with the parts to which it is adhered.

Furthermore, according to the present invention, there is provided a method of producing an assembly of a transparent sheet material and a gasket adhered to its periphery, characterized by the operations of: a) setting a transparent sheet material within the interior of a mold cavity formed by a plurality of co-operating mold parts, the mold cavity having the model and position with respect to the transparent sheet of the final gasket and enclosing the circumferential surfaces of the sheet immediately adjacent its periphery; B) injecting into the mold cavity a composition capable of polymerization and hardening to produce a gasket and which adheres to the peripheral surfaces of the sheet material when cured in contact therewith; C) regulating the pressure * 8402900 * - 8 - whereby the composition is injected into the mold cavity to one which is sufficiently low that the sheet material is not damaged; d) controlling the temperature of the mold cavity, the injection of the composition and the amount of the composition that is injected so that the composition polymerizes after injection and comes into intimate contact with the autogenous pressure associated with the polymerization the mold cavity and with the sheet material, and hardens while in this contact; and e) removing the assembly from the mold cavity.

Then the drawings are considered in more detail.

Figures 1, 2, 3 and 4 show a preformed window assembly according to the present invention and produced according to the method thereof. More specifically, a preformed rear window 10 for insertion into a suitable opening in a vehicle body is shown. The vehicle body has a rear wall portion 12 which substantially defines the opening to be closed. The back wall portion 12 is typically formed from a sheet metal stamping piece and is suitably attached to a reinforcing member 14 by, for example, electrical resistance welding. Extending outwardly from the rear wall portion 12 and typically integrally formed therewith is a consecutive wall portion 16 defining, in conjunction with the rear wall portion 12, a cavity intended for receiving the preformed window assembly 10. The wall portion 16 terminates in a fairly sudden bend, at which point the material 18 is contoured and it comes together as a whole with the sheet metal defining the silhouette of the associated vehicle 35.

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The preformed back window assembly 10 includes an appropriately molded window material 12, which is typically formed of a sheet of optically transparent glass. A mounting or gasket member 5 22 encapsulates the front, back and peripheral edge portions of the window material 20. The outer beaded or finishing portion 24 of the gasket 22, as clearly seen in Figure 4, covers a gap between the peripheral edge of the window material and the metal of the vehicle body surrounding the opening, the wall portion 16 of which is exemplary. when the preformed assembly 10 is actually installed on the vehicle.

The portion of the mounting or gasket member 22, which extends within the finishing portion 24, surrounds the peripheral edge and the trailing edge of the window board material 20 and extends along the rear surface thereof.

A rib or sheet member 26 also occurs on the rear surface of the window material 20 located some distance within the end of the mounting or packing member 22. The region between the end of the gasket 22 and the rib 26 is intended to enclose a beaded edge of suitable bonding material used in assembling the preformed window assembly. Furthermore, tabs 28 are integral with the gasket 22 and the rib 26 and the bridge member 30 between the gasket 22 and the rib 26 and tabs 28. The tabs 28 form applicators and adjusters that are useful during mounting of the assembly on a related vehicle and to hold the assembly in place until the related bonding material hardens to effect the desired bond between the preformed assembly and the joining portion of the vehicle.

The first operation in producing the rear window 10 involves thoroughly cleaning the front, rear, and peripheral edges of the glass sheet material 20 to prepare the surfaces for adhesion to the mounting gasket. 22, the rib 26 and the associated lips 28. In some instances, it has been found desirable to include a layer 32 of opaque paint, glass chip enamel, or the like, which is applied to a portion of the back surface of the plate 20. The opaque material of the layer 32 is typically employed where it is necessary to conceal window mounting materials and structures as well as, for example, windshield wiper drive mechanisms, and in some instances where it is appropriate to protect them from ultraviolet radiation.

The next operation in producing the rear window 10 is to apply a primer coating to the pre-cleaned glass surfaces. Satisfactory results have been obtained by initially applying a layer 34 of a product commercially available under the designation "Betaseal, Glass Primer 435.18 Commercial Grade" from Essex Chemical Corporation, Clifton, New Jersey, U.S.A. The glass bonding area is initially coated with the primer to form the layer 34 which serves as a coupling agent. The base material is a clear moisture-sensitive primer consisting of a gamma-amino-propyltriethoxylan, which promotes adhesion between other Betaseal products and glass.

After the application of the layer 34, a second primer coating 36 is applied over the layer 34 to obtain satisfactory results using a product commercially available under the designation "Betaseal, Glass Primer 435.20 Commercial Grade" from the 30 Essex Chemical Corporation. This material consists of a blackout primer that prevents ultraviolet attack from urethane sealants and adhesives and contributes to the rapid formation of a hydrolytically stable bond between the glass and urethane. About 20 minutes 35 after the superposed layers 34 and 36 have been applied 8402900 - ii - the assembly is placed in the mold cavity of a mold where the polyurethane gasket 22, the rib 26 and the lips 28 are produced; the shape is part of a device which is described in detail later with reference to Figures 5 to 10. It is often desirable to apply a coating 38 to the outer exposed surface of the finish portion of the gasket 22. before installing the construction in a vehicle. The coating 28 may consist of a black urethane-based paint, such as one manufactured by PPG Industries, Inc., Pittsburgh, Penn sylvania, tr.S.A. under the designation Purethane 700 HSE-848.

The paint coating 38 is then baked at about 60 ° -65 ° C for about 20-30 minutes. The coating 38 is applied to protect exposed polyurethane packing material from attack that would otherwise be caused by exposure to ultraviolet radiation as normally occurs in unfiltered sunlight.

The preformed window assembly can be installed in a suitable vehicle opening by applying a beaded edge 40 of adhesive material, for example, a urethane sealant such as a sealant manufactured by the Essex Chemical Corporation and referred to as Betaseal 551.2, with water paste, on the circumferential rear edge surface. between the gasket member 22 and the spaced rib 26, adjusting the assembly aligned with the vehicle opening, and pushing the assembly into place. When the assembly is aligned with the vehicle opening, the lips 28 are aligned with spaced cooperating openings 42 in the rear wall portion 12 and the associated reinforcement member 14 of the vehicle. The lips 28 have tapered tips to facilitate alignment. When the assembly is pushed into place, the tapered tip portions of the lips 28 pass through the openings 42 to snap them into locked positions where they hold the bead bead 40 in a compressed state ( see figure 4). Once the bonding material 40 hardens, installation is complete.

Referring now to Figures 5 through 10, it is seen that the assembly 10 producing apparatus includes a primer paint station 50 and a molding station 52 (see Figure 5), which includes a bulk storage area 54 comprising a stream consisting of a mixture of polyol, a chain expanding agent, for example ethylene glycol, pigment and a catalyst and a separate stream of an isocyanate are supplied as required to a urethane measuring station 56. The isocyanate from the bulk storage tank 54 is supplied to a conditioning tank 58, while the polyol mixture is supplied to a tank 60. The outlets of the tanks 15 58 and 60 communicate with respective displacement cylinders or high pressure metering pumps 66 and 68 through the intermediary of respective recirculation pumps 62 and 64 to keep the material flowing at all times through the supply lines leading to a mixing head 74 and through recirculation lines back to displacement cylinders 66 and 68 feed. Heat exchanger boots 70 and 72 are employed in the system to maintain the desired reaction component temperatures. Constant motion and temperature control are essential to keep the various insoluble compounds in solution at temperatures where the reactants remain inert and liquid, but will react quickly upon assembly.

An injection system is arranged to inject a charge consisting of precisely controlled parts of the two circulating streams into the mold in a smooth, smooth flow. Measured charges of the two streams are supplied to the mixing head 74 from the outlets of displacement cylinders 66 and 68, respectively, through the action of pistons shown schematically. The injection into the mixing head 74 takes place under an applied pressure of the order of about 70 to 210 kg / cm 2. The two streams are mixed thoroughly in the mixing head 74. The mixture is delivered therefrom into a related mold 76 at a pressure of about 3.5 to 7 kg / cm 2. The mold is typically kept at a temperature within the range of 60 ° -65 ° C.

The mold 76 consists of a bottom part 78 (Figure 7) and a top part 80. Suitable means, not shown, are provided to open and close the mold parts 78 and 80. When the parts are open, the glass sheet 20 is placed on the lower part 78 so that portions of the rear surface of the glass come to rest on suitably adjusted pads 82. After the glass member 20 is properly positioned on the pads 82 of the lower molded part 78, the upper part 80 is lowered into place so that the outer peripheral edges of the mating parts 78 and 80 can be clamped together in metal-to-metal contact outside the mold cavity. The upper mold part 80 of the mold carries pads 84 which, in conjunction with the pads 82, function to press the glass plate 20 in a yielding manner and to lock it within the mold cavity. The cavity of the mold 76 is larger than the molded glass plate 20 to avoid any glass-to-metal contact.

Vacuum cups in Figures 7 and 9 are shown in the upper mold part 80 of mold 76 to raise the glass in conjunction with the mold part 80 when the molding operation is completed and it is desired to remove the glass sheet 20 from mold 76 . The vacuum head mainly consists of a suction cup 86 which communicates with a source of underpressure through a vacuum line 88.

A number of movable mold segments, generally indicated at 90, are arranged at spaced points around the circumference of the mold corresponding to the positions of the lips 28. All of the mold segments are 8402900

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- 14 - Tics and are slidably received in respective recesses 92 provided in the lower mold part 78. The outer end of each segment 90 is bonded with respect to the shape to a block 94 operatively connected to the remote end. of a reciprocating piston rod 96 of a conventional fluid-actuated cylinder 98. The opposite or inner end of each segment 90 tapers into a contour corresponding to the outer profile of the gasket 22 and includes an extension 100 that undercuts the the lip 28. In operation, the piston rod 96 is expanded, advancing the molding segment. 90 (Figures 8 and 10) ready to receive the charge of packing resin. After polymerization and hardening of the packing material, the piston rod 96 and 15 retract the movable molding segment 90, as shown by dashed-dotted lines in Figure 10, withdrawing the extension 10Q from the undercut portion of the lip 28, releasing the lip and releasing the back seam assembly for removal from the lower mold part 78 by the vacuum take-up of the upper mold part 80.

After removal of the assembly from the molding part 78, any excess packing material or burr is removed at a station 100, the assembly is washed and dried at a station 110 and the paint coat 38 is applied to the outer exposed coating. working portion of the gasket 32 and baked to harden at the station 120.

The following example is the best mode of operation currently contemplated and should be taken by way of example only and not in a limiting sense.

EXAMPLE

The surfaces of the top and bottom moldings 80 and 78 surrounding the mold cavity therebetween when assembled are treated with a solvent-based mold release agent consisting of a mixture of waxes; the particular mold release agent is commercially available from the Park Chemical Company, Detroit, Michigan, U.S.A. under the trade designation PRC-789. A glass plate 20 was then suitably adjusted to the lower mold 78, after which the upper mold 80 was matched with the lower mold 78, and the two were clamped together.

A batch consisting of one part by weight of a polyol composition and 0.63 parts by weight of an isocyanate was then driven into the mixing head 74 at a pressure of 177 kg / cm 2 and hence in the form 77 at a pressure of about 3.5 kg / cm2. The polyol and isocyanate streams were at a temperature of 43 ° C, while the mold 76 was at a temperature of 63 ° C. The polyol and isocyanate streams were mixed thoroughly in the cup 74 before reaching form 76. About another half minute after the urethane composition was injected therein, the mold 76 was opened and the assembly 10 was removed therefrom.

The resulting elastomeric packing 22 was 20 microcellular, had a specific gravity of 1.07 g / cc, a hardness (Shore "A") of 90, a tensile strength of 106 kg / cm2, a percent elongation at break of 279, and a flexural modulus ( at 24 ° C) of about 250 kg / cm2.

The polyol composition used in carrying out the procedure described in the previous example consisted of 45 kilograms of a base polyol, namely a polyether triol with ethylene oxide "cover" having a molecular weight of 6000, sold under the trademark "Voranol 5815 by the Dow Chemical Company, Midland, Michigan, USA, 4.5 kilograms of ethylene glycol, and 1.4 kilograms of 20% carbon black in polyol.

The isocyanate used in practicing the procedure of the previous example consisted of a modified 4,4 'diphenylmethane-35 diisocyanate sold under the trademark Rubinate 84029 00 wv - 16 - LP 179 by Rubicon Chemicals Inc ., Geismar, Louisiana.

The aforementioned components were catalyzed by the addition of dibutyltin dilaurate, and a solution of triethylenediamine in dipropylene glycol. It will be appreciated that various changes and modifications can be made to the specific details of the present invention as described above without departing from its scope as defined in the following claims. For example, it should be clearly understood that although the preformed window assembly 10 consists of an automotive rear window construction, an assembly of the invention will function equally well in any fixed glazing application for vehicles such as automobiles, trucks, freight wagons, or buses, as well as in many other applications such as related to architectural, boat structures.

The shapes of the finishing portion 24 and of the molding 22 lend themselves to accomplishing aerodynamic objectives of the automotive industry.

An ongoing goal of automotive designers is to create aerodynamically cleaner vehicle shapes to increase vehicle efficiency and thereby reduce energy requirements to allow for lower fuel consumption. As the vehicle rear windshield and windshield will clearly be sources of significant resistance to the smooth flow of air, attention has been constantly focused on the aerodynamic design enhancement of the design of the rear windshield and windshield assemblies and their associated fasteners and trim.

When considering the windshield structures of the currently known types as discussed here previously, it will be apparent that the various fasteners and finish were imperfect from an aerodynamic point of view and generated unwanted eddy currents which adversely affect the overall efficiency of the vehicle and also cause objectionable wind riot in the interior of the vehicle during propulsion. The present invention permits a preformed windshield assembly which can be integrally incorporated into a smooth mount system, the finishing portion corresponding to a portion 24 of the mount or gasket member 22 being substantially smooth with the adjacent surfaces beneath it. thus greatly improving the aerodynamic properties and reducing unwanted eddy currents and resulting wind rage.

Although the preferred embodiment of the invention uses a polyurethane composition to obtain the desired results, other compositions of nylons, polyesters and epoxies may also be suitably used.

Briefly, the preformed assembly of a transparent sheet material and a gasket attached to its periphery, and the method of producing the assembly have been described previously. Preferably * the sheet material is made of glass and the gasket is formed from a thermosetting polyurethane material. The material, which is curable to produce the gasket, is injected into a mold cavity and then, under the control of the associated parameters, the material is forced into intimate contact with the mold cavity and the sheet material by the autogenous pressure associated with the polymerization. . After the material has hardened sufficiently, the resultant assembly is removed from the mold cavity.

84029 00%

Claims (22)

4 »V '^ - 18 - A glazing comprising a transparent sheet material and a gasket consisting of a synthetic polymer adhered to certain parts of said plate, characterized in that said gasket is polymerized on site adjacent to said certain parts of said plate. and through the autogenous mechanism associated with its polymerization and hardening while entrapped has come into intimate contact with the parts to which it is attached. A glazing according to claim 1, characterized in that said gasket comprises a finishing part extending outside said plate in a plane substantially parallel to the adjacent circumferential front surface of said plate. A glazing according to claim 1 or 2, characterized in that said sheet material consists of glass. A glazing according to any one of claims 1 to 3, characterized in that said sheet material consists of laminated glass. A glazing according to claim 3, characterized in that said glass plate is tempered. A glazing according to any one of claims 1 to 5, characterized in that said gasket extends entirely around the circumference of the plate and is adhered to the adjacent circumferential edge surfaces thereof. A glazing according to any one of claims 1 to 6, characterized in that said gasket consists of a polyurethane. A glazing according to any one of claims 1 to 7, characterized in that said packing consists of a micro-cellular polyurethane elastomer. A glazing according to any one of claims 1 to 8, characterized by an ultraviolet absorbent coating on the exposed surface of said gasket. 8402900 - 19 - A glazing according to any one of claims 1 to 9, characterized in that said gasket comprises a channel of substantially U-shaped cross section which extends beyond the trailing edge surface of said plate. A glazing according to claim 10, characterized in that said channel is bounded by a pair of spaced rib members, which form an area therebetween to receive an adhesive. 12. A method of producing an assembly of a transparent sheet material and a gasket adhered to its periphery, characterized by the operations of a) setting a transparent sheet material within the interior of a mold cavity formed by a number of co-operating mold parts, what mold cavity has the model and position with respect to the transparent sheet of the final gasket and encloses the circumferential surfaces of the sheet immediately adjacent its circumference? B) injecting into the mold cavity a composition capable of polymerization and hardening to produce a packing and, when cured in contact therewith, adheres to the peripheral surfaces of the sheet material? C) controlling the pressure at which the composition is injected into the mold cavity to one that is sufficiently low that the sheet material is not damaged? d) controlling the temperature of the mold cavity, the injection of the composition, and the amount of the composition injected so that the composition polymerizes after injection and comes into intimate contact with the autogenous pressure associated with the polymerization the mold cavity and with the sheet material, and hardens while in contact 8402900 V * <* r - 20 -; and. e) removing the assembly from the mold cavity. Method according to claim 12, 5, characterized in that a primer is applied to the edge surfaces of the sheet material before the setting of said material in the mold cavity, which primer is useful for the adhesion of said gasket to said edge surfaces to improve. A method according to claim 12 or 13, characterized in that said packing-forming composition comprises an isocyanate and a polyol and forms a microcellular polyurethane elastomer upon polymerization and curing. Method according to claim 14, 15, characterized in that said mold parts surrounding the mold cavity are maintained at a temperature in the range of about 60 ° C to 65 ° C. A method according to claim 14 or 15, characterized in that said composition is injected into the mold cavity 20 at a pressure of about 3.5 kg / cm2 to 7 kg / cm2. Method according to any one of claims 12 to 16, characterized in that said sheet material consists of laminated glass, 18 * Method according to any one of claims 12 to 16, characterized in that said sheet material is tempered glass exists. 19. A method according to any one of claims 12 to 18, characterized by the operation of applying an ultraviolet absorbent coating to the exposed surface of said gasket after removal thereof from said mold cavity. 20. A glazing, substantially as suggested in the description and / or drawings. 21. Method, substantially as suggested in the description and / or drawings. 8402900 -ΐν - 21. 22. Device substantially as suggested in the description and / or drawings. 8402900 j *