WO2023041860A1 - Luminous laminated glazing with ultraviolet-reactive transparent ink coating - Google Patents

Luminous laminated glazing with ultraviolet-reactive transparent ink coating Download PDF

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Publication number
WO2023041860A1
WO2023041860A1 PCT/FR2022/051671 FR2022051671W WO2023041860A1 WO 2023041860 A1 WO2023041860 A1 WO 2023041860A1 FR 2022051671 W FR2022051671 W FR 2022051671W WO 2023041860 A1 WO2023041860 A1 WO 2023041860A1
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WO
WIPO (PCT)
Prior art keywords
laminated glazing
luminous
glazing
transparent ink
glass
Prior art date
Application number
PCT/FR2022/051671
Other languages
French (fr)
Inventor
Sophie BARAT
Original Assignee
Saint-Gobain Glass France
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saint-Gobain Glass France filed Critical Saint-Gobain Glass France
Priority to CN202280005520.4A priority Critical patent/CN116137867A/en
Publication of WO2023041860A1 publication Critical patent/WO2023041860A1/en

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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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10247—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons
    • B32B17/10256—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons created by printing techniques
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10247—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons
    • B32B17/10256—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons created by printing techniques
    • B32B17/10266—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons created by printing techniques on glass pane
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10247—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons
    • B32B17/10256—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons created by printing techniques
    • B32B17/10275—Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons created by printing techniques on interlayer
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10541—Functional features of the laminated safety glass or glazing comprising a light source or a light guide
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10688—Adjustment of the adherence to the glass layers
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/1077—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing polyurethane
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/50—Sympathetic, colour changing or similar inks

Definitions

  • the invention relates to luminous laminated glazing, of the type for automobiles or buildings, providing uniform lighting in the face, or according to decorative or informative patterns (for example a text), in one or more colors .
  • One way could consist in providing laminated glazing with a source of visible light such as a light-emitting diode (abbreviated to LED in French, or LED, from the English light-emitting diode) of visible light, optically coupled to a transparent light-diffusing coating, for the extraction of this visible light.
  • a source of visible light such as a light-emitting diode (abbreviated to LED in French, or LED, from the English light-emitting diode) of visible light, optically coupled to a transparent light-diffusing coating, for the extraction of this visible light.
  • a source of visible light such as a light-emitting diode (abbreviated to LED in French, or LED, from the English light-emitting diode) of visible light, optically coupled to a transparent light-diffusing coating, for the extraction of this visible light.
  • fingerprints left by glazing users also extract light.
  • visible LED extraction solutions leave a visible mark on the glazing, which is not desired; in
  • the object of the invention was to provide a solution for extracting light from laminated glazing which, in the off state (off) of the lighting, is invisible on each side of the glazing. , Day and night.
  • a luminous laminated glazing comprising at least a first sheet of glass and a second sheet of glass bonded to each other by an adhesive layer interlayer, a main face internal to the structure of the laminated glazing, of at least one of the two sheets of glass and/or at least one of the two main faces of the interlayer adhesive layer being coated with a layer of transparent ink, characterized in that the ink emits visible light under ultraviolet radiation.
  • An ink of such nature emitting visible light under UV excitation, has, compared to a transparent ink diffusing visible light, that is to say extracting it, the ability to be much less visible, invisible from day or night, in the off state of the active glazing.
  • fingerprints or equivalent marks are absolutely invisible under ultraviolet radiation.
  • the glass sheets are chosen from sheets of mineral glass such as soda-lime, aluminosilicate, borosilicate, optionally hardened, thermally toughened, or chemically reinforced, and sheets of structural transparent polymer material such as poly(methacrylate of methyl) (PMMA) or polycarbonate (PC).
  • sheet of structural transparent polymer material means a sheet capable of constituting on its own a monolithic glazing, of ensuring its mechanical strength, in particular, and having an elastic modulus of the order of 1500 MPa for example, in contrast to an intermediate adhesive layer, for example.
  • the intermediate adhesive layer is chosen from a layer of polyvinyl butyral (PVB), thermoplastic polyurethane (TPU) or ethylene-vinyl acetate (EVA) copolymer.
  • PVB polyvinyl butyral
  • TPU thermoplastic polyurethane
  • EVA ethylene-vinyl acetate
  • the layer(s) of transparent ink is or are independently of one another on the full face or according to decorative or informative patterns such as a pictogram, text.
  • the layer(s) of transparent ink comprise(s) areas and/or patterns emitting visible light of different colors.
  • the luminous laminated glazing is curved.
  • the luminous laminated glazing comprises a source of ultraviolet radiation coupled to the layer(s) of transparent ink via a waveguide consisting of at least one of the two sheets of glass and/or the intermediate adhesive layer.
  • the source of ultraviolet radiation preferably emits between 390 and 410 nm.
  • the luminous laminated glazing is a motor vehicle glazing chosen from a roof, optionally panoramic, opening, a windshield, a side glazing, a rear door glazing, a rear window or a backlight, or a building glazing such as veranda or facade.
  • Another object of the invention consists of a method of manufacturing a luminous laminated glazing according to one of the preceding claims, characterized in that that it comprises the application on a main face internal to the structure of the laminated glazing, of at least one of the two sheets of glass and/or on at least one of the two main faces of the intermediate adhesive layer, of a layer of transparent ink, which emits visible light under ultraviolet radiation, then the drying of the transparent ink prior to the assembly of the luminous laminated glazing.
  • the transparent ink is applied by screen printing.
  • EXAMPLE 1 By screen printing an interlayer sheet of polyvinyl butyral with an ink of the composition detailed in the table below, after assembly with two sheets of float soda-lime glass, a laminated glazing of high mechanical quality and with transparent printing, invisible day and night in the absence of exposure to ultraviolet radiation.
  • the "touch dry" time of 10 min is short and compatible with a continuous line industrial process.
  • the [OH] content of polyvinyl butyral corresponds to a mass percentage of poly(vinyl alcohol) of 18%.
  • the wetting agent also acts as a plasticizer, that is to say it allows greater deformation of the printed ink film without degradation of its optical properties.
  • This is dimethylcyclohexyl phthalate.
  • the UV ink is taken from a UV-Fluorescent Felt, marketed by Molotow® (Germany) under the name FEUTRE PINCEAU UV FLUORESCENT PUMP SOFTLINER. It is a transparent, UV-fluorescent alcohol-based ink, which in this case, under UV radiation, emits blue light. There are some from the same supplier that emit a green, yellow orange or pink light.
  • the diester is a mixture of 60% by mass of dimethyl glutarate, 20% by mass of dimethyl succinate and 20% by mass of dimethyl adipate.
  • the glycol diether solvent is triethylene glycol dimethyl ether.
  • the surface tension modifier is a 2-ethylhexyl acrylate copolymer; it does not contain silicone.
  • the Brookfield viscosity of the ink at 20° C. is 11 Pa.s, values of between 9 and 13 Pa.s being suitable within the scope of the invention. This measurement is performed as follows. The viscosity of the ink is reduced to a stable value by rotation for at least 8 hours of a roller in the ink. A sample of the latter is taken, on which the viscosity is measured by means of a cone-plane viscometer.
  • the thickness of wet ink deposited by screen printing is between 10 and 50 ⁇ m.
  • the adhesion of the printed interlayer laminate is attested by the satisfaction of the "ball drop" tests (falling ball) according to regulation N ° 43, addendum 42, of the agreement E / ECE / 324, E / ECE / TRANS/505, concerning the adoption of uniform technical prescriptions applicable to wheeled vehicles, equipment and parts which may be fitted or used on a wheeled vehicle and the conditions for reciprocal recognition of approvals granted in accordance with these prescriptions.
  • Example 1 The ink of Example 1 is screen-printed on a soda-lime glass substrate on a Thieme machine with a 147 X 52 full-face type screen of 90.48 mesh and then dried in an infrared oven at 160°C.
  • UV lamp black light
  • UV ink With illumination by an ultraviolet lamp (black light), a blue coloration is observed for the sample with the addition of UV ink.
  • the sample without added UV ink does not react to UV lamp excitation.
  • optical properties of the two printed samples are evaluated, with and without the addition of UV ink.
  • a Lumicam photometer/colorimeter
  • model 1300-202 from the manufacturer Instruments Systems of the Konika-Minolta brand
  • high-performance LumiCam software which calculates all the relevant values from the data of the saved image and offers many functions for quick analysis.
  • the luminance (cd/m 2 ) is evaluated according to the DIN 5032 part 1: 1999 standard.
  • the colorimetry part, or tristimulus for the CIE 1931 it is according to the DIN 5033 part 3 1992 standard.
  • the Lumicam measurements belong to two categories.
  • the Lumicam Spotmeter spot-meter
  • Avg Average luminance value (cd/m 2 ) on the defined surface.
  • StdDev Standard Deviation
  • Tg avg Target average
  • tg StdDev the standard deviation with respect to this average.
  • a Hazemeter, haze-gard model plus 4725 from the BYK® brand is used. It controls a total transparency according to the methods of the international standards: ASTM D1003 - Standard method of test of haze and light transmission of transparent plastics.
  • TL %) is Light Transmission (Transmittance)
  • H %) is Blur/Haze (Haze)
  • C %) is Sharpness/Clarity (Clarity).
  • the substrate can be printed with transparent ink containing UV ink (also transparent in the absence of ultraviolet radiation) according to a decorative or informative pattern (pictogram, text) with excellent definition, which appears under ultraviolet radiation by re-emission of blue light in accordance with this pattern.
  • the pattern thus produced diffuses visible light, which it is capable of extracting from the glass substrate.
  • such an extraction of visible light increases the visibility of the fingerprints of the users of the glazing.
  • the emission of visible light under UV occurs in a remarkable manner with total disappearance of these fingerprints, and perfect neatness of the printed pattern.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a luminous laminated glazing comprising at least a first glass sheet and a second glass sheet bonded to one another by an intermediate adhesive layer, a main face internal to the structure of the laminated glazing, wherein at least one of the two glass sheets and/or at least one of the two main faces of the intermediate adhesive layer is coated with a layer of transparent ink, characterised in that the ink emits visible light under ultraviolet radiation; and a method for manufacturing said glazing.

Description

Description Description
Titre de l'invention : Vitrage feuilleté lumineux à revêtement d’encre transparente réactive aux ultraviolets Title of the invention: Luminous laminated glazing with UV-reactive transparent ink coating
[0001 ] L’invention est relative aux vitrages feuilletés lumineux, du type pour l’automobile ou le bâtiment, procurant un éclairage uniforme en pleine face, ou selon des motifs décoratifs ou informatifs (par exemple un texte), en une ou plusieurs couleurs. [0001] The invention relates to luminous laminated glazing, of the type for automobiles or buildings, providing uniform lighting in the face, or according to decorative or informative patterns (for example a text), in one or more colors .
[0002] Une voie pourrait consister à munir un vitrage feuilleté d’une source de lumière visible telle que diode électroluminescente (abrégé en DEL en français, ou LED, de l’anglais light-emitting diode) de lumière visible, optiquement couplée à un revêtement transparent diffusant la lumière, pour l’extraction de cette lumière visible. Cependant, les traces de doigts laissées par les utilisateurs des vitrages extraient aussi la lumière. De plus, les solutions d’extraction de LED visible laissent une marque visible sur le vitrage, qui n’est pas souhaitée ; autrement dit, le revêtement transparent diffusant la lumière visible, pour l’extraction de celle-ci du vitrage, n’est pas invisible, ce qui est un inconvénient. [0002] One way could consist in providing laminated glazing with a source of visible light such as a light-emitting diode (abbreviated to LED in French, or LED, from the English light-emitting diode) of visible light, optically coupled to a transparent light-diffusing coating, for the extraction of this visible light. However, fingerprints left by glazing users also extract light. In addition, visible LED extraction solutions leave a visible mark on the glazing, which is not desired; in other words, the transparent coating diffusing the visible light, for the extraction of the latter from the glazing, is not invisible, which is a disadvantage.
[0003] L’invention a eu pour objectif la mise à disposition d’une solution d’extraction de lumière d’un vitrage feuilleté qui, dans l’état éteint (off) de l’éclairage, soit invisible de chaque côté du vitrage, de jour comme de nuit. [0003] The object of the invention was to provide a solution for extracting light from laminated glazing which, in the off state (off) of the lighting, is invisible on each side of the glazing. , Day and night.
[0004] Cet objectif a été atteint par l’invention qui, en conséquence, a pour objet un vitrage feuilleté lumineux comprenant au moins une première feuille de verre et une seconde feuille de verre collées l’une à l’autre par une couche adhésive intercalaire, une face principale interne à la structure du vitrage feuilleté, d’au moins une des deux feuilles de verre et/ou au moins l’une des deux faces principales de la couche adhésive intercalaire étant revêtue(s) d’une couche d’encre transparente, caractérisée en ce que l’encre émet une lumière visible sous un rayonnement ultraviolet. This objective has been achieved by the invention which, consequently, relates to a luminous laminated glazing comprising at least a first sheet of glass and a second sheet of glass bonded to each other by an adhesive layer interlayer, a main face internal to the structure of the laminated glazing, of at least one of the two sheets of glass and/or at least one of the two main faces of the interlayer adhesive layer being coated with a layer of transparent ink, characterized in that the ink emits visible light under ultraviolet radiation.
[0005] Une encre de telle nature, émettant une lumière visible sous une excitation UV, présente, par rapport à une encre transparente diffusant la lumière visible, c’est-à- dire extractrice de celle-ci, l’aptitude à être beaucoup moins visible, invisible de jour comme de nuit, dans l’état off du vitrage actif. De plus les traces de doigts ou marques équivalentes sont absolument invisibles sous un rayonnement ultraviolet. [0005] An ink of such nature, emitting visible light under UV excitation, has, compared to a transparent ink diffusing visible light, that is to say extracting it, the ability to be much less visible, invisible from day or night, in the off state of the active glazing. In addition, fingerprints or equivalent marks are absolutely invisible under ultraviolet radiation.
[0006] De préférence, les feuilles de verre sont choisies parmi des feuilles de verre minéral tel que sodocalcique, aluminosilicate, borosilicate, éventuellement durci, trempé thermiquement, ou renforcé chimiquement, et des feuilles de matériau polymère transparent structural tel que poly(méthacrylate de méthyle) (PMMA) ou polycarbonate (PC). Au sens de cette caractéristique, on entend par feuille de matériau polymère transparent structural une feuille susceptible de constituer à elle seule un vitrage monolithique, d’en assurer la résistance mécanique, en particulier, et ayant un module élastique de l’ordre de 1500 MPa par exemple, au contraire d’une couche adhésive intercalaire, par exemple. [0006] Preferably, the glass sheets are chosen from sheets of mineral glass such as soda-lime, aluminosilicate, borosilicate, optionally hardened, thermally toughened, or chemically reinforced, and sheets of structural transparent polymer material such as poly(methacrylate of methyl) (PMMA) or polycarbonate (PC). Within the meaning of this characteristic, the term "sheet of structural transparent polymer material" means a sheet capable of constituting on its own a monolithic glazing, of ensuring its mechanical strength, in particular, and having an elastic modulus of the order of 1500 MPa for example, in contrast to an intermediate adhesive layer, for example.
[0007] De préférence, la couche adhésive intercalaire est choisie parmi une couche de polyvinylbutyral (PVB), polyuréthane thermoplastique (TPU) ou copolymère éthylène - acétate de vinyle (EVA). [0007] Preferably, the intermediate adhesive layer is chosen from a layer of polyvinyl butyral (PVB), thermoplastic polyurethane (TPU) or ethylene-vinyl acetate (EVA) copolymer.
[0008] De préférence, la ou les couche(s) d’encre transparente est ou sont indépendamment l’une de l’autre en pleine face ou selon des motifs décoratifs ou informatifs tels que pictogramme, texte. [0008] Preferably, the layer(s) of transparent ink is or are independently of one another on the full face or according to decorative or informative patterns such as a pictogram, text.
[0009] De préférence, la ou les couche(s) d’encre transparente compren(d)(nent) des zones et/ou motifs émettant une lumière visible de couleurs différentes. [0009] Preferably, the layer(s) of transparent ink comprise(s) areas and/or patterns emitting visible light of different colors.
[0010] De préférence, le vitrage feuilleté lumineux est bombé. [0010] Preferably, the luminous laminated glazing is curved.
[0011 ] De préférence, le vitrage feuilleté lumineux comprend une source de rayonnement ultraviolet couplée à la ou aux couche(s) d’encre transparente par l’intermédiaire d’un guide d’onde constitué de l’une au moins des deux feuilles de verre et/ou de la couche adhésive intercalaire. La source de rayonnement ultraviolet émet de préférence entre 390 et 410 nm. [0011] Preferably, the luminous laminated glazing comprises a source of ultraviolet radiation coupled to the layer(s) of transparent ink via a waveguide consisting of at least one of the two sheets of glass and/or the intermediate adhesive layer. The source of ultraviolet radiation preferably emits between 390 and 410 nm.
[0012] De préférence, le vitrage feuilleté lumineux est un vitrage de véhicule automobile choisi parmi un toit, éventuellement panoramique, ouvrant, un pare- brise, un vitrage latéral, un vitrage de porte arrière, une lunette arrière ou un rétroéclairage, ou un vitrage de bâtiment tel que de véranda ou de façade. [0012] Preferably, the luminous laminated glazing is a motor vehicle glazing chosen from a roof, optionally panoramic, opening, a windshield, a side glazing, a rear door glazing, a rear window or a backlight, or a building glazing such as veranda or facade.
[0013] Un autre objet de l’invention consiste en un procédé de fabrication d’un vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce qu’il comprend l’application sur une face principale interne à la structure du vitrage feuilleté, d’au moins une des deux feuilles de verre et/ou sur au moins l’une des deux faces principales de la couche adhésive intercalaire, d’une couche d’encre transparente, qui émet une lumière visible sous un rayonnement ultraviolet, puis le séchage de l’encre transparente préalablement à l’assemblage du vitrage feuilleté lumineux. [0013] Another object of the invention consists of a method of manufacturing a luminous laminated glazing according to one of the preceding claims, characterized in that that it comprises the application on a main face internal to the structure of the laminated glazing, of at least one of the two sheets of glass and/or on at least one of the two main faces of the intermediate adhesive layer, of a layer of transparent ink, which emits visible light under ultraviolet radiation, then the drying of the transparent ink prior to the assembly of the luminous laminated glazing.
[0014] De préférence, l’encre transparente est appliquée par sérigraphie. [0014] Preferably, the transparent ink is applied by screen printing.
[0015] L’invention sera mieux comprise à la lumière des exemples suivants. The invention will be better understood in the light of the following examples.
[0016] EXEMPLE 1 [0017] Par sérigraphie d’une feuille intercalaire de polyvinylbutyral avec une encre de composition détaillée dans le tableau ci-dessous, on obtient après assemblage à deux feuilles de verre sodocalcique flotté, un vitrage feuilleté de haute qualité mécanique et à impression transparente, invisible de jour comme de nuit en l’absence d’une exposition à un rayonnement ultraviolet. Le temps de « sec au toucher >> de 10 min est court et compatible avec un procédé industriel en ligne continue. [0016] EXAMPLE 1 [0017] By screen printing an interlayer sheet of polyvinyl butyral with an ink of the composition detailed in the table below, after assembly with two sheets of float soda-lime glass, a laminated glazing of high mechanical quality and with transparent printing, invisible day and night in the absence of exposure to ultraviolet radiation. The "touch dry" time of 10 min is short and compatible with a continuous line industrial process.
[0018] Dans le tableau ci-dessous, toutes les proportions sont indiquées en pourcentages massiques. [0018] In the table below, all the proportions are indicated in mass percentages.
[0019] [Tableaux 1 ]
Figure imgf000004_0001
[0020] On évalue la masse moléculaire du polyvinylbutyral de la manière suivante. On prépare des solutions de poudres de polyvinylbutyral à 3 g/l dans le tétrahydrofurane, puis on les injecte sur une colonne de chromatographie par perméation de gel de type Waters Styragel HR4E, 1 ml/min de tétrahydrofurane. Les chromatogrammes sont établis au moyen d’un détecteur évaporatif à diffusion de lumière. Le pic large observé à 7-7,1 min indique des masses en équivalent PS de 46000-55000, c’est-à-dire pratiquement centrées sur 50000. [0019] [Tables 1]
Figure imgf000004_0001
[0020] The molecular mass of the polyvinyl butyral is evaluated as follows. Solutions of polyvinyl butyral powders at 3 g/l in tetrahydrofuran are prepared, then they are injected onto a gel permeation chromatography column of the Waters Styragel HR4E type, 1 ml/min of tetrahydrofuran. The chromatograms are established by means of an evaporative light scattering detector. The broad peak observed at 7-7.1 min indicates PS equivalent masses of 46000-55000, i.e. practically centered on 50000.
[0021 ] Le taux d’[OH] du polyvinylbutyral correspond à un pourcentage massique de poly (alcool vinylique) de 18 %. [0021] The [OH] content of polyvinyl butyral corresponds to a mass percentage of poly(vinyl alcohol) of 18%.
[0022] L’agent mouillant fait également office de plastifiant c'est-à-dire qu’il autorise une plus grande déformation du film d’encre imprimé sans dégradation de ses propriétés optiques. Il s’agit ici du dimethylcyclohexyl phtalate. The wetting agent also acts as a plasticizer, that is to say it allows greater deformation of the printed ink film without degradation of its optical properties. This is dimethylcyclohexyl phthalate.
[0023] L’encre UV est prélevée sur un Feutre UV-Fluorescent, commercialisé par la Société Molotow® (Allemagne) sous la dénomination FEUTRE PINCEAU UV FLUORESCENT PUMP SOFTLINER. C’est une encre transparente, fluorescente aux UV à base d’alcool, qui en l’espèce, sous un rayonnement UV, émet une lumière bleue. Il en existe du même fournisseur qui émettent une lumière verte, jaune orange ou rose. [0023] The UV ink is taken from a UV-Fluorescent Felt, marketed by Molotow® (Germany) under the name FEUTRE PINCEAU UV FLUORESCENT PUMP SOFTLINER. It is a transparent, UV-fluorescent alcohol-based ink, which in this case, under UV radiation, emits blue light. There are some from the same supplier that emit a green, yellow orange or pink light.
[0024] Le diester est un mélange de 60 % en masse de glutarate de diméthyle, 20 % en masse de succinate de diméthyle et 20 % en masse d’adipate de diméthyle. The diester is a mixture of 60% by mass of dimethyl glutarate, 20% by mass of dimethyl succinate and 20% by mass of dimethyl adipate.
[0025] Le solvant diéther de glycol est l’éther diméthylique de triéthylène glycol. The glycol diether solvent is triethylene glycol dimethyl ether.
[0026] L’agent de modification de la tension de surface est un copolymère d’acrylate de 2-éthylhexyle; il ne contient pas de silicone. The surface tension modifier is a 2-ethylhexyl acrylate copolymer; it does not contain silicone.
[0027] La viscosité Brookfield de l’encre à 20 °C est de 11 Pa.s, des valeurs comprises entre 9 et 13 Pa.s convenant dans le cadre de l’invention. Cette mesure est effectuée de la manière suivante. On diminue la viscosité de l’encre à une valeur stable par rotation pendant au moins 8 heures d’un rouleau dans l’encre. Un échantillon de cette dernière est prélevé, sur lequel est mesurée la viscosité au moyen d’un viscosimètre cône-plan. The Brookfield viscosity of the ink at 20° C. is 11 Pa.s, values of between 9 and 13 Pa.s being suitable within the scope of the invention. This measurement is performed as follows. The viscosity of the ink is reduced to a stable value by rotation for at least 8 hours of a roller in the ink. A sample of the latter is taken, on which the viscosity is measured by means of a cone-plane viscometer.
[0028] L’épaisseur d’encre humide déposée par sérigraphie est comprise entre 10 et 50 |im. [0029] L’adhésion du feuilleté à intercalaire imprimé est attestée par la satisfaction aux essais « ball drop » (bille tombante) selon le règlement N ° 43, additif 42, de l’accord E/ECE/324, E/ECE/TRANS/505, concernant l’adoption de prescriptions techniques uniformes applicables aux véhicules à roues, aux équipements et aux pièces susceptibles d’être montés ou utilisés sur un véhicule à roues et les conditions de reconnaissance réciproque des homologations délivrées conformément à ces prescriptions. [0028] The thickness of wet ink deposited by screen printing is between 10 and 50 μm. [0029] The adhesion of the printed interlayer laminate is attested by the satisfaction of the "ball drop" tests (falling ball) according to regulation N ° 43, addendum 42, of the agreement E / ECE / 324, E / ECE / TRANS/505, concerning the adoption of uniform technical prescriptions applicable to wheeled vehicles, equipment and parts which may be fitted or used on a wheeled vehicle and the conditions for reciprocal recognition of approvals granted in accordance with these prescriptions.
[0030] EXEMPLE 2 [0030] EXAMPLE 2
[0031 ] L’encre de l’Exemple 1 est sérigraphiée sur un substrat de verre sodocalcique sur machine Thieme avec un écran type Aplat pleine face 147 X 52 de maille 90.48 puis séchée au four infra rouge à 160 °C. [0031] The ink of Example 1 is screen-printed on a soda-lime glass substrate on a Thieme machine with a 147 X 52 full-face type screen of 90.48 mesh and then dried in an infrared oven at 160°C.
[0032] Pour mesures comparatives, nous avons également procédé à la sérigraphie à l’identique de l’encre dépourvue d’encre UV. [0032] For comparative measurements, we also carried out identical screen printing of the ink without UV ink.
[0033] Les applications ont été réalisées sur des échantillons de dimensions 150 X 60 mm. The applications were carried out on samples of dimensions 150×60 mm.
[0034] Sans éclairage, on constate une transparence identique entre l’échantillon contenant un ajout d’encre UV et celui n’en contenant pas. Without lighting, an identical transparency is observed between the sample containing an addition of UV ink and that not containing any.
[0035] Avec éclairage de lumière visible au moyen d’une diode électroluminescente (abrégé en DEL en français, ou LED, de l’anglais light-emitting diode), on constate une intensité lumineuse dans le blanc neutre pour l’échantillon avec encre UV et plutôt dans le blanc froid pour celui sans ajout d’encre UV. With visible light illumination by means of a light-emitting diode (abbreviated as LED in French, or LED, from the English light-emitting diode), there is a light intensity in neutral white for the sample with ink UV and rather in cold white for the one without adding UV ink.
[0036] Avec éclairage par une lampe à ultraviolet (lumière noire), on constate une coloration bleue pour l’échantillon avec ajout d’encre UV. L’échantillon sans ajout d’encre UV ne réagit pas à l’excitation de la lampe UV. With illumination by an ultraviolet lamp (black light), a blue coloration is observed for the sample with the addition of UV ink. The sample without added UV ink does not react to UV lamp excitation.
[0037] On évalue les propriétés optiques des deux échantillons imprimés, avec et sans ajout d’encre UV. The optical properties of the two printed samples are evaluated, with and without the addition of UV ink.
[0038] On emploie en premier lieu un Lumicam (photomètre / colorimètre), modèle 1300-202 du fabricant Instruments Systems de la marque Konika-Minolta, couplé au logiciel LumiCam haute performance qui calcule toutes les valeurs pertinentes à partir des données de l’image enregistrée et offre de nombreuses fonctions pour l’analyse rapide. Lors du calibrage de l’équipement, la luminance (cd/m2) est évaluée selon la norme DIN 5032 part 1 : 1999. Pour la partie colorimétrie, ou tristimulus pour le CIE 1931 c’est selon la norme DIN 5033 part 3 1992. [0038] A Lumicam (photometer/colorimeter), model 1300-202 from the manufacturer Instruments Systems of the Konika-Minolta brand, is first used, coupled with the high-performance LumiCam software which calculates all the relevant values from the data of the saved image and offers many functions for quick analysis. When calibrating the equipment, the luminance (cd/m 2 ) is evaluated according to the DIN 5032 part 1: 1999 standard. For the colorimetry part, or tristimulus for the CIE 1931 it is according to the DIN 5033 part 3 1992 standard.
[0039] Les mesures au Lumicam appartiennent à deux catégories. Dans la première catégorie, le Lumicam Spotmeter (Spot-mètre) définit au pixel près des zones surface de mesure et calcul automatique de la luminance, des coordonnées xy de couleur, de la température de couleur proximale et de la longueur d’onde dominante. Avg (Average) désigne la valeur moyenne de luminance (cd/m2) sur la surface définie. StdDev (Standard Deviation) désigne l’écart-type, écart moyen par rapport à la moyenne. Dans la deuxième catégorie, le Lumicam Polygone permet d’évaluer une surface dont le périmètre est modifiable. Tg avg (Target average) désigne la moyenne des valeurs principales de luminance (cd/m2), et tg StdDev l’écart-type par rapport à cette moyenne. The Lumicam measurements belong to two categories. In the first category, the Lumicam Spotmeter (Spot-meter) defines to the nearest pixel measurement surface areas and automatic calculation of luminance, xy color coordinates, proximal color temperature and dominant wavelength. Avg (Average) designates the average luminance value (cd/m 2 ) on the defined surface. StdDev (Standard Deviation) is the standard deviation, mean deviation from the mean. In the second category, the Lumicam Polygon makes it possible to evaluate a surface whose perimeter can be modified. Tg avg (Target average) designates the average of the main luminance values (cd/m 2 ), and tg StdDev the standard deviation with respect to this average.
[0040] On emploie en second lieu un Hazemeter, modèle haze-gard plus 4725 de la marque BYK®. Il contrôle une transparence totale selon les méthodes des normes internationales : ASTM D1003 - Méthode standard de test de voile et de transmission lumineuse des plastiques transparents. TL (%) correspond à la transmission lumineuse (Transmittance), H (%) au flou / voile ( Haze), C (%) correspond à la netteté / clarté ( Clarity). Secondly, a Hazemeter, haze-gard model plus 4725 from the BYK® brand is used. It controls a total transparency according to the methods of the international standards: ASTM D1003 - Standard method of test of haze and light transmission of transparent plastics. TL (%) is Light Transmission (Transmittance), H (%) is Blur/Haze (Haze), C (%) is Sharpness/Clarity (Clarity).
Les résultats sont consignés dans le tableau suivant. The results are recorded in the following table.
[0041 ] [Tableaux 2]
Figure imgf000007_0001
[0041 ] [Tables 2]
Figure imgf000007_0001
0042] Les mesures effectuées avec le Lumicam montrent une augmentation de la luminance de 3,23 % (Spot / Avg) et 4,80 % (Polygone / Tg avg). Les mesures effectuées avec le Hazemeter en transmission lumineuse, flou et clarté, montrent des résultats similaires avec et sans ajout d’encre UV. [0043] Selon l’invention, on peut imprimer le substrat avec l’encre transparente contenant l’encre UV (également transparente en l’absence de rayonnement ultraviolet) selon un motif décoratif ou informatif (pictogramme, texte) avec une excellente définition, qui apparait sous rayonnement ultraviolet par réémission de lumière bleue conformément à ce motif. Le motif ainsi réalisé est diffusant de lumière visible, qu’il est apte à extraire du substrat de verre. Cependant une telle extraction de lumière visible augmente la visibilité des traces de doigts des utilisateurs du vitrage. Au contraire, l’émission de lumière visible sous UV, selon l’invention, se produit de manière remarquable avec disparition totale de ces traces de doigts, et netteté parfaite du motif imprimé. 0042] The measurements taken with the Lumicam show an increase in luminance of 3.23% (Spot / Avg) and 4.80% (Polygon / Tg avg). Measurements made with the Hazemeter in light transmission, haze and clarity, show similar results with and without the addition of UV ink. According to the invention, the substrate can be printed with transparent ink containing UV ink (also transparent in the absence of ultraviolet radiation) according to a decorative or informative pattern (pictogram, text) with excellent definition, which appears under ultraviolet radiation by re-emission of blue light in accordance with this pattern. The pattern thus produced diffuses visible light, which it is capable of extracting from the glass substrate. However, such an extraction of visible light increases the visibility of the fingerprints of the users of the glazing. On the contrary, the emission of visible light under UV, according to the invention, occurs in a remarkable manner with total disappearance of these fingerprints, and perfect neatness of the printed pattern.

Claims

Revendications Claims
[Revendication 1 ] Vitrage feuilleté lumineux comprenant au moins une première feuille de verre et une seconde feuille de verre collées l’une à l’autre par une couche adhésive intercalaire, une face principale interne à la structure du vitrage feuilleté, d’au moins une des deux feuilles de verre et/ou au moins l’une des deux faces principales de la couche adhésive intercalaire étant revêtue(s) d’une couche d’encre transparente, caractérisée en ce que l’encre émet une lumière visible sous un rayonnement ultraviolet. [Claim 1] Luminous laminated glazing comprising at least a first sheet of glass and a second sheet of glass bonded to each other by an intermediate adhesive layer, a main face internal to the structure of the laminated glazing, of at least one of the two sheets of glass and/or at least one of the two main faces of the intermediate adhesive layer being coated with a layer of transparent ink, characterized in that the ink emits visible light under a ultraviolet radiation.
[Revendication 2] Vitrage feuilleté lumineux selon la revendication 1 , caractérisé en ce que les feuilles de verre sont choisies parmi des feuilles de verre minéral tel que sodocalcique, aluminosilicate, borosilicate, éventuellement durci, trempé thermiquement, ou renforcé chimiquement, et des feuilles de matériau polymère transparent structural tel que poly(méthacrylate de méthyle) (PMMA) ou polycarbonate (PC). [Claim 2] Laminated luminous glazing according to claim 1, characterized in that the glass sheets are chosen from sheets of mineral glass such as soda lime, aluminosilicate, borosilicate, optionally hardened, thermally toughened, or chemically reinforced, and sheets of structural transparent polymeric material such as poly(methyl methacrylate) (PMMA) or polycarbonate (PC).
[Revendication 3] Vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce que la couche adhésive intercalaire est choisie parmi une couche de polyvinylbutyral (PVB), polyuréthane thermoplastique (TPU) ou copolymère éthylène - acétate de vinyle (EVA). [Claim 3] Luminous laminated glazing according to one of the preceding claims, characterized in that the intermediate adhesive layer is chosen from a layer of polyvinyl butyral (PVB), thermoplastic polyurethane (TPU) or ethylene-vinyl acetate copolymer (EVA).
[Revendication 4] Vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce que la ou les couche(s) d’encre transparente est ou sont indépendamment l’une de l’autre en pleine face ou selon des motifs décoratifs ou informatifs tels que pictogramme, texte. [Claim 4] Luminous laminated glazing according to one of the preceding claims, characterized in that the layer or layers of transparent ink is or are independently of one another on the full face or according to decorative or information such as pictogram, text.
[Revendication 5] Vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce que la ou les couche(s) d’encre transparente compren(d)(nent) des zones et/ou motifs émettant une lumière visible de couleurs différentes. [Claim 5] Luminous laminated glazing according to one of the preceding claims, characterized in that the layer(s) of transparent ink comprise(s) zones and/or patterns emitting visible light of different colors .
[Revendication 6] Vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce qu’il est bombé. [Claim 6] Laminated luminous glazing according to one of the preceding claims, characterized in that it is curved.
[Revendication 7] Vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce qu’il comprend une source de rayonnement ultraviolet couplée à la ou aux couche(s) d’encre transparente par l’intermédiaire d’un guide d’onde constitué de l’une au moins des deux feuilles de verre et/ou de la couche adhésive intercalaire. [Claim 7] Luminous laminated glazing according to one of the preceding claims, characterized in that it comprises a source of ultraviolet radiation coupled to the layer or layers of transparent ink by through a waveguide consisting of at least one of the two sheets of glass and/or the intermediate adhesive layer.
[Revendication 8] Vitrage feuilleté lumineux selon la revendication 7, caractérisé en ce que la source de rayonnement ultraviolet émet entre 390 et 410 nm. [Claim 8] Luminous laminated glazing according to Claim 7, characterized in that the source of ultraviolet radiation emits between 390 and 410 nm.
[Revendication 9] Vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce qu’il est un vitrage de véhicule automobile choisi parmi un toit, éventuellement panoramique, ouvrant, un pare-brise, un vitrage latéral, un vitrage de porte arrière, une lunette arrière ou un rétro-éclairage, ou un vitrage de bâtiment tel que de véranda ou de façade. [Claim 9] Luminous laminated glazing according to one of the preceding claims, characterized in that it is a motor vehicle glazing chosen from a roof, optionally panoramic, opening, a windscreen, a side glazing, a door glazing back, a rear window or a backlight, or building glazing such as a veranda or facade.
[Revendication 10] Procédé de fabrication d’un vitrage feuilleté lumineux selon l’une des revendications précédentes, caractérisé en ce qu’il comprend l’application sur une face principale interne à la structure du vitrage feuilleté, d’au moins une des deux feuilles de verre et/ou sur au moins l’une des deux faces principales de la couche adhésive intercalaire, d’une couche d’encre transparente, qui émet une lumière visible sous un rayonnement ultraviolet, puis le séchage de l’encre transparente préalablement à l’assemblage du vitrage feuilleté lumineux. [Claim 10] Process for manufacturing luminous laminated glazing according to one of the preceding claims, characterized in that it comprises the application, on a main face internal to the structure of the laminated glazing, of at least one of the two sheets of glass and/or on at least one of the two main faces of the intermediate adhesive layer, of a layer of transparent ink, which emits visible light under ultraviolet radiation, then the drying of the transparent ink beforehand to the assembly of the luminous laminated glazing.
[Revendication 1 1] Procédé selon l’une des revendications 10, caractérisé en ce que l’encre transparente est appliquée par sérigraphie. [Claim 1 1] Method according to one of Claims 10, characterized in that the transparent ink is applied by screen printing.
PCT/FR2022/051671 2021-09-16 2022-09-05 Luminous laminated glazing with ultraviolet-reactive transparent ink coating WO2023041860A1 (en)

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