Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
  • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
  • B29C45/14811—Multilayered articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
  • B29K2995/0005—Conductive
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0037—Other properties
  • B29K2995/0087—Wear resistance
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0037—Other properties
  • B29K2995/0093—Other properties hydrophobic
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
  • B29L2031/3052—Windscreens
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/778—Windows
  • B29L2031/7782—Glazing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/584—Scratch resistance
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
  • B32B2309/08—Dimensions, e.g. volume
  • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
  • B32B2309/105—Thickness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2419/00—Buildings or parts thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2605/00—Vehicles
  • B32B2605/006—Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24777—Edge feature
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
  • Y10T428/2495—Thickness [relative or absolute]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
  • Y10T428/2495—Thickness [relative or absolute]
  • Y10T428/24967—Absolute thicknesses specified
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/249921—Web or sheet containing structurally defined element or component
  • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
  • Y10T428/249933—Fiber embedded in or on the surface of a natural or synthetic rubber matrix
  • Y10T428/249939—Two or more layers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31507—Of polycarbonate

Definitions

• the present invention relates to plastic products, essentially flat and at least partly transparent, which are adapted by their high optical quality to an application as glazing.
• plastics are lighter, which is a decisive advantage for urban vehicles with an electric motor, since an increase in their range is crucial. In such vehicles, it could even be envisaged to produce entire doors, or even complete sides of the bodywork, including the windows, in a single block, and possibly to paint a lower part thereof.
• the lightness of transparent surfaces is advantageous compared to modern transport vehicles, insofar as technical progress goes hand in hand with the integration of ever more numerous functions in the glazing (rear window heating, radio antenna, defrosting the windshield, coloring to prevent the interior from heating up in the event of strong sunlight, incorporation of electrochromic compounds, display of information on the windshield, etc.), and with ever-increasing glass surfaces. This results in a general increase in the harmful vehicle in terms of energy consumption.
• plastics are likely to provide, compared to glass, improved security conditions, and superior theft protection, due to their superior resilience.
• a no less important advantage of plastics compared to glass is their superior ability to be easily transformed into complex shapes.
• the ability of the plastic sheets to be more or less deformed in a reversible manner makes it possible to envisage installation methods in the considerably simplified bodywork bays, with snap-in, from the inside and from the outside. of the vehicle.
• thermoforming is carried out by contact with at least one solid mold surface and, possibly with compressed air or with suction.
• the devices used are bulky and, in particular, of excessive lengths. The yields turn out to be relatively low and the losses of material inevitable. High product quality is only achieved at the cost of a difficult development of the process and, possibly, of an additional resurfacing treatment.
• the new glazing made available consists essentially of a first plastic material and has at least one appendage molded into a second plastic material.
• adhesion to the first plastic material aptitude for elastic deformation, sealing, reversibility of lasting crushing, rigidity, resistance to bending, mechanical resistance ( in particular to crushing or compression) ...
• the addition of overmolded plastic material can be located on one or the other of the two faces of the flat product: it can be a base for an interior mirror overmolded on a plastic windshield, or any positioning, centering or marking appendage, or a fixing stud.
• the product of the invention has a plastic core, a skin which comprises at least one plastic film supporting an anti-scratch layer and disposed on at least one face of the recessed core. relative to the edges thereof, inside the surface delimited by the encapsulated peripheral part of the addition of plastic material.
• the core assumes most of the mechanical properties, in particular of the flexural strength, on the whole that it forms with the skin or the two skins and, all the more that the latter are thin, 'thickness of each being, for example, of the order of 0.25 mm. Its thickness can be of the order of 1 to 10 mm.
• thermoplastics such as polycarbonate, poly (methyl methacrylate), ethylene / vinyl acetate copolymer, poly (ethylene glycol terephthalate), poly (butylene glycol terephthalate), polycarbonate / polyester copolymers, polyurethane, cyclo-copolymer olefinic of the ethylene / norbornene, or ethylene / cyclopentadiene type, ionomer resins, for example an ethylene / (meth) acrylic acid copolymer neutralized by a polyamine, thermosets or heat-crosslinkable such as polyurethane, unsaturated polyester, ethylene / vinyl acetate copolymer.
• thermoplastics such as polycarbonate, poly (methyl methacrylate), ethylene / vinyl acetate copolymer, poly (ethylene glycol terephthalate), poly (butylene glycol terephthalate), polycarbonate / polyester copolymers, polyurethane, cyclo-copoly
• thermoplastic preferably injectable, with a relatively low and inexpensive softening temperature, such as polycarbonate.
• the core can also consist of a combination of several thicknesses of the same or more of the aforementioned plastics.
• the thickness of the skin, or of each of the two skins is advantageously chosen at most equal to 500 ⁇ m, preferably between 50 and 300 ⁇ m, the skin consisting of one or more films of thermoformable plastic material, between which is interposed, or on which is deposited if necessary at least one functional layer, at least one of these films can moreover itself constitute such a functional layer.
• thermoformable plastic material of these films conveniently belongs to the group of polycarbonate, polypropylene, poly (methyl methacrylate), ethylene / vinyl acetate copolymer, poly (ethylene glycol terephthalate), poly (butylene glycol terephthalate), polyurethane, polyvinyl butyral, and cycloolefinic copolymer like ethylene / norbornene or ethylene / cyclopentadiene, polycarbonate / polyester copolymer, ionomer resin.
• the anti-scratch layer has a thickness of the order of 1 to 10 ⁇ m; it generally forms the external surface of the product of the invention. It may be essentially mineral and consist in particular of polysiloxanes and / or of silica and / or alumina derivatives, or mixed, such as consisting of networks of mineral and organic molecular chains intertwined and linked to one another by means of silicon bonds -carbon. Such a mixed layer has excellent transparency, adhesion and scratch resistance properties. It seems that the mineral network gives the coating its hardness and scratch resistance, the organic network its elasticity and resilience.
• the characteristic according to the preferred embodiment according to which the one or both skins are arranged on the faces of the core recessed with respect to their edges, and more precisely inside the surface delimited by the encapsulated peripheral part of the adding plastic is advantageous. It makes it possible to make the most of the excellent adhesion of common materials in the addition encapsulated, in particular elastomeric thermoplastics, on polycarbonate and other usual constituent materials of the core.
• the outer layer of the skin in contact with the environment, contains a hydrophobic / oleophobic agent which therefore confers this property on the outer surface of the product.
• a hydrophobic / oleophobic agent fluorinated polysilanes are well known, in particular obtained from precursors comprising at one end a hydrolysable function of alkoxy or halo type serving for chemical attachment to the substrate and a perfluorinated carbon chain at the 'other end, intended to constitute the external surface of the product.
• the hydrophobic / oleophobic agent is, in decreasing order of preference, incorporated in the anti-scratch layer, which has a chemical structure close to its own, or with which it is at least chemically compatible, or grafted in the form of a thin layer with a thickness between 2 and 50 nm, preferably on the anti-scratch layer or else self-supported on a plastic film, such as a poly (vinyl fluoride) (PVF) or poly (vinylidene fluoride) ( PVDF), to be applied advantageously directly on the anti-scratch layer.
• PVF poly (vinyl fluoride)
• PVDF poly (vinylidene fluoride)
• At least one decorative and / or masking layer covering all or part of the surface of the product, is positioned in the skin, preferably directly under the support film of the anti-scratch layer.
• This layer can, for example, replace the screen-printed decoration frequently deposited on the periphery of the inner face of glazing, in particular for motor vehicles, in order to mask, for an observer located outside the vehicle, the bodywork elements forming the frame of the bay and the bead of glue which is thus protected from degradation by ultraviolet radiation. It may include elements of opaque or transparent colored decoration, making it possible to produce elements of color matching the bodywork or the equipment. interior, logos, etc.
• the skin can be provided with an adhesion layer, in particular on its inner face to ensure attachment with the core, but also between two films or layers of the skin.
• adhesion layer in particular on its inner face to ensure attachment with the core, but also between two films or layers of the skin.
• Common adhesives are polyvinyl butyral, polyurethane or acrylic adhesives.
• the optically selective layers which are stacked, for example under the decoration and / or masking layer, or above the latter under the support film of the scratch-resistant layer, or well even above the scratch-resistant layer.
• These layers are distinguished by a high transmission in the visible range (wavelengths from 400 to 800 nm) and a high absorption and / or reflection in the ultraviolet ( ⁇ 400 nm) and infrared (> 800 nm) range.
• These layers may consist of thin metallic layers, for example based on silver, of thicknesses between 2 and 35 nm, separated from each other as well as from other adjacent layers or films by dielectric layers of oxides or nitrides of indium, tin, silicon, zinc, titanium, tungsten, tantalum, niobium, aluminum, zirconium ..., with thicknesses generally between 10 and 150 nm.
• These layers can comprise at least one colored layer in the mass.
• All of these layers can conduct electricity; it can belong to the family of anti-solar stacks, used to limit the supply of heat by solar radiation in closed spaces or to that of low-emissive stacks, used on the contrary to limit the heat loss in closed spaces, mainly due to transmission of infrared radiation through the glazing.
• anti-solar stacks used to limit the supply of heat by solar radiation in closed spaces or to that of low-emissive stacks, used on the contrary to limit the heat loss in closed spaces, mainly due to transmission of infrared radiation through the glazing.
• the skin is provided with a stack of anti-reflective layers.
• This stack may include, for example, a fluoride or an aluminum oxyfluoride capable of being deposited in a thin layer by a vacuum technique of the sputtering type, possibly assisted by magnetic field.
• a fluoride or an aluminum oxyfluoride capable of being deposited in a thin layer by a vacuum technique of the sputtering type, possibly assisted by magnetic field.
• Such stacking is described in patent FR 2 745 284, the teaching of which is incorporated here for reference.
• the skin comprises an electrically conductive network included, for example, in an adhesive layer of polyvinylbutyral or polyurethane, or sandwiched between two such layers, and assuming in known manner the function of heating-defrosting-demisting or antenna;
• the material of the encapsulated plastic addition is an elastomer such as styrene / ethylene / butylene / styrene copolymer possibly modified, polyurethane, polyurethane-acrylic alloy, chosen for its adhesion to the core, its elasticity, its resilience, its color or its translucent character depending on the case. It is, in particular, thermoplastic. This material does not require any prior priming treatment of the core.
• the invention also relates to a first method of manufacturing the product described above, in which the injection of a first and then a second plastic material is carried out in a single mold, the first plastic material being that of the soul, and the second that of the encapsulated addition.
• This process has the merit of limiting the number of injection machines used and the corresponding size and of reducing manufacturing times, that is to say ultimately increasing yields.
• the product not being handled does not have to be dusted.
• this method comprises an operation of transfer by rotation of the product from the injection of the first material plastic, from a first impression where the injection of the first plastic material has previously taken place, into a second impression used for the subsequent injection of the second plastic material.
• n injections a mold comprising n imprints distributed at an angular distance of 2 ⁇ / n relative to the axis of rotation can be used. More precisely, it is a mold similar to the multi-injection mold with a rotating mobile part with imprint, or with a rotary loader described in patent FR-B 1-2 725 152, the teaching of which is incorporated here by way of reference.
• the product of the invention is produced by injecting a first plastic material into a first mold, then by transferring the product of this injection into a second mold, in which is injected a second plastic material.
• This process does not exclude additional injection operations, each separated by a transfer or handling of the product. It also does not exclude a process comprising successively an injection into a mold, the withdrawal of this mold from the product of the injection, the transformation of this mold by removal of removable parts of volume corresponding to that of the following injection, repositioning the injection product in this mold, and finally the next injection.
• the methods of manufacturing the product of the invention avoid the pitfall of the insufficient optical quality of the products commonly obtained by extrusion.
• the one or both skins comprising their film of material plastic supporting an anti-scratch layer are first made flat on a support, so that their face provided with anti-scratch varnish in formation is free from any mechanical contact, at least over their extent for which a quality optics is required.
• a state of cohesion of the skin and a degree of hardening of the intermediate and controllable anti-scratch varnish are then reached.
• the skins are thermoformed, always in the absence of any mechanical contact with the face provided with the anti-scratch coating, or on the contrary with contact. This results in both a shaping of the skin, and the completion of the hardening of the scratch-resistant coating.
• the process leading to perfect cohesion of the skin ends when it cools.
• thermoformed skins are then advantageously held at the bottom of the mold by any suitable means such as suction, blowing or electrostatic effect, several of these means being possibly associated, before the injection of the first plastic material constituting the core of the product of the invention.
• the skin comprises an electrically conductive network
• this is preferably formed beforehand by metal screen printing.
• the invention also relates to the application of the product described above as glazing for the building or transport vehicles, in particular for the automobile.
• EXAMPLE 1 On a film of 250 ⁇ m thickness of standard polycarbonate prepared from Bisphenol A, marketed by the company BAYER AG under the registered trademark "Makrolon" and whose glass transition temperature T g is equal to 145 ° C., the anti-scratch coating described in the example of patent application EP-A1-0 718 348 is deposited by flow coating in a liquid film 20 ⁇ m thick. After drying, this thickness is reduced to 5 ⁇ m.
• the coated support film is then placed at the bottom of a mold, the layer anti-scratch being positioned above; the assembly is subjected to a heat treatment of 155 ° C for 30 min.
• a skin within the meaning of the preferred embodiment of the present invention is then formed in its almost final form. This is placed at the bottom of a first shape, in which it is held by electrostatic effect, opposite a first impression of a bi-injection mold with rotary charger comprising two impressions diametrically opposite with respect to the axis of rotation, as described in patent FR-B1-2 725 152 with reference to FIG. 2, the anti-scratch layer being in contact with the mold wall.
• the rotary mold loader is activated at 180 °, so that the product of the polycarbonate injection is positioned on a second impression.
• a modified styrene / ethylene / butylene / styrene copolymer of hardness 75 Shore A is then injected, so as to form a molded profile over the entire periphery of the polycarbonate sheet.
• perfect adhesion of the polycarbonate of the soul to that of the skin This is limited to a surface located inside the peripheral strip intended to be covered by the encapsulated addition, formed during the second injection.
• a recess in the bottom of the first shape of the mold allows, before the first injection, to correctly position the skin.
• Example 2 The procedure of Example 1 is reproduced with a film 325 ⁇ m thick of the same standard polycarbonate provided, on one side, with an anti-scratch coating sold by the company GENERAL ELECTRIC under the reference HP 92. Screen printing is carried out around the perimeter using epoxy-based ink. The film is cut following the screen printing. Its dimensions are such that it is set back from the edges of the subsequently injected core, as specified above. The film is placed in the mold cavity. The polycarbonate core is then injected, then the peripheral addition according to operations identical to those of Example 1.
• the final product has a transparency, an optical quality amply sufficient for an application as glazing.
• the process of the invention has the advantages inherent in the injection technique.
• the encapsulated addition does not necessarily cover the entire periphery of the core.
• the excellent adhesion of the addition encapsulated on the polycarbonate core corresponds to a peeling force at 90 ° of the order of 100 N / cm, with a cohesive break in the material encapsulate (that is, it tears in the thickness of the tongue used in the peel test.
• a cohesive break in the material encapsulate that is, it tears in the thickness of the tongue used in the peel test.
• the adhesion on award-winning glass corresponds to a peeling force at 90 ° of 30-40 N / cm, but is almost zero on plastic.
• the method of the invention does not exclude conforming the core with a peripheral bead to increase its rigidity, or with a relief and / or extensions such as ribs, profiles, legs or ears, and / or to have within the plastic one or more inserts, in particular metallic.
• This arrangement is particularly useful for gripping or fixing the product of the invention, as well as for the final assembly for which it is intended, as in a bodywork bay of a motor vehicle.
• the formation of suitable peripheral profiles makes it possible to envisage mounting the product from inside the vehicle, that is to say from the passenger compartment.
• the bead of glue is then placed under the edge of the bay bodywork and is not exposed to sunlight.
• the protection of the adhesive bead by a varnish formed on the periphery of the inner face of the sheet naturally becomes superfluous.
• the appendages formed at the periphery of the product during its injection can be preserved, or sawn in whole or in part according to their use. Sanding can be provided after such sawing.
• a peripheral profile of geometry symmetrical with respect to the plane of the product may be appropriate, for example in the case of transparent lateral surfaces of transport vehicles, either part of the profile that can be sawn later, depending on whether it is 'acts of the right or left transparent element.
• possible inserts can be linked to the incorporation into the product of particular functions, such as a stop light in a rear window.
• the process of the invention is therefore economical, easy and reliable and allows the use of numerous combinations of constituents, without the problem of their compatibility, in particular in terms of their processing temperatures, being posed.
• the use of a mold with a rotating part makes it possible to obtain plastic glazings fitted with an encapsulate, in particular an elastomer, with short manufacturing times and high yields, for a minimum investment in equipment and machines, all maintaining the required optical quality.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Laminated Bodies (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Window Of Vehicle (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (6)

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Citations (11)

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• 1998
  • 1998-06-19 FR FR9807768A patent/FR2779990B1/fr not_active Expired - Fee Related
• 1999
  • 1999-06-17 US US09/736,021 patent/US6811857B1/en not_active Expired - Fee Related
  • 1999-06-17 ES ES99925119T patent/ES2257863T3/es not_active Expired - Lifetime
  • 1999-06-17 EP EP99925119A patent/EP1089876B1/fr not_active Expired - Lifetime
  • 1999-06-17 JP JP2000554537A patent/JP4700804B2/ja not_active Expired - Fee Related
  • 1999-06-17 PT PT99925119T patent/PT1089876E/pt unknown
  • 1999-06-17 KR KR1020007014342A patent/KR100609654B1/ko not_active Expired - Fee Related
  • 1999-06-17 DE DE69929597T patent/DE69929597T2/de not_active Expired - Lifetime
  • 1999-06-17 WO PCT/FR1999/001454 patent/WO1999065678A1/fr not_active Ceased

Patent Citations (11)

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