METHOD FOR THE PRODUCTION OF A PRINTED LAMINATED GLAZING

Abstract

A method for manufacturing a printed laminated glazing including at least one transparent sheet bonded to an adhesive interlayer, wherein the adhesive interlayer is obtained from at least a first and a second partial adhesive interlayers, wherein one of the two main faces of the first or the second partial adhesive interlayer is printed with an ink, wherein the transparent sheet, the first and the second partial adhesive interlayers are joined so that the printed main face of the first or the second partial adhesive interlayer is in direct contact with the second or the first partial adhesive interlayer, then the lamination is carried out.

Claims

1. A method for manufacturing a printed laminated glazing comprising at least one transparent sheet bonded to an adhesive interlayer, the method comprising: obtaining the adhesive interlayer from at least a first and a second partial adhesive interlayers; printing one of two main faces of the first or second partial adhesive interlayer with an ink; joining the transparent sheet, the first and second partial adhesive interlayers so that the printed main face of the first or the second partial adhesive interlayer is in direct contact with the second or the first partial adhesive interlayer, and then laminating the transparent sheet, the first and second partial adhesive interlayers.

2. The method according to claim 1, wherein a first and a second transparent sheets are bonded via the adhesive interlayer.

3. The method according to claim 1, wherein the transparent sheet or sheets are, each independently of the other, made of mineral glass of soda-lime, aluminosilicate, or borosilicate or of a polymer material.

4. The method according to claim 1, wherein the first and the second partial adhesive interlayers, as well as any other adhesive interlayer which forms part of the printed laminated glazing are, each independently of the other, made of polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), or thermoplastic polyurethane (TPU).

5. The method according to claim 1, wherein at least the two main faces of the first and one second partial adhesive interlayers in direct contact with each other have a roughness between 2.80 and 4.20 μm.

6. The method according to claim 1, wherein one of the two main faces of the first or the second partial adhesive interlayer is subjected to oxidation by plasma flaming, or corona discharge, prior to being printed.

7. The method according to claim 1, wherein one of the two main faces of the first or the second partial adhesive interlayer is printed by screen printing, inkjet, offset, flexography, pad printing, or digital printing.

8. The method according to claim 1, wherein one of the two main faces of the printed first or second partial adhesive interlayer is dried before the first and second partial adhesive interlayers are joined to the transparent sheet and in direct contact with each other.

9. The method according to claim 1, wherein at least one of the two main faces of at least one transparent sheet, the main face internal to the structure of the printed laminated glazing, that is not exposed to the outside, is printed by screen-printing, inkjet, offset, flexography, pad printing, or digital printing, with the same ink as one of the two main faces of the first or the second partial adhesive interlayer.

10. The method according to claim 1, wherein the printed laminated glazing is an automotive glazing, a glazing for building construction, solar energy or industry.

11. The method according to claim 3, wherein the transparent sheet or sheets made of mineral glass of the soda-lime, aluminosilicate, borosilicate are thermally tempered or chemically reinforced and the polymer material is polycarbonate (PC), poly(methyl methacrylate) (PMMA), polyurethane (PU).

12. The method according to claim 10, wherein the automotive glazing is a windshield.

Description

EXAMPLE

[0037] Two 0.38 mm thick PVB partial adhesive layers, marketed by Eastman under the registered trademark Saflex® RB11, are used, with the two main faces thereof having a roughness of between 2.85 and 4.18 μm.

[0038] One face of one of these two partial layers is screen-printed.

[0039] The ink is mixed for 30 minutes, its viscosity is measured, a thinner is added if the viscosity is not in compliance, and then the ink is mixed for 30 minutes before being applied to the screen-printing screen.

[0040] The screen-printing is done on the PVB sheet.

[0041] Inks of different compositions and colors are used.

[0042] The ink is dried and then the partial layer of PVB is joined to the second partial layer of unprinted PVB so that the print is at the interface of the two partial layers. Then a conventional assembly is carried out (deaeration through setting under vacuum, subjecting to a rise in temperature, pressure) of the two partial layers of PVB to two sheets of soda-lime float glass. A laminated glazing of high mechanical quality and colored printing of high optical quality as described above is obtained. The “dry to touch” time of 10 minutes is short and compatible with an industrial continuous line process.

[0043] A black ink with the composition detailed in the table below is used, wherein all proportions are given in percentages by weight.

TABLE-US-00001 TABLE 1 MIN AND % BY MAX % COMPONENT CAS NO. WEIGHT BY MASS POLYVINYL BUTYRAL 63148-65-2 12 11/13 WETTING AGENT 27987-25-3 8  5/10 CARBON BLACK 133386-4 9  8/12 BLACK IRON OXIDE 1317-61-9 28 28/32 DIESTER 627-93-0 38 35/40 1119-40-0 106-65-0 CYCLOHEXANONE 108-94-1 4 3/5 SURFACE TENSION 26376-86-3 1 0.5/2.sup.  MODIFIER

[0044] The [OH] content of polyvinyl butyral corresponds to a polyvinyl alcohol weight percentage of 18%.

[0045] The wetting agent also acts as a plasticizer, i.e. it allows greater deformation of the printed ink film without impairing its optical properties. In this case it is dimethylcyclohexyl phthalate.

[0046] The specific surface area of carbon black is 65 m.sup.2/g, with values of 40 to 150 m.sup.2/g being generally suitable.

[0047] The diester is a mixture of 60% by weight of dimethyl glutarate, 20% by weight of dimethyl succinate and 20% by weight of dimethyl adipate.

[0048] The surface tension modifier is a 2-ethylhexyl acrylate copolymer; it does not contain silicone.

[0049] The Brookfield viscosity of the ink at 20° C. is 11 Pa.Math.s, with values between 9 and 13 Pa.Math.s being suitable for the purpose of the invention. This measurement is done in the following manner. The viscosity of the ink is reduced to a stable value by rotating a roller in the ink for at least 8 hours. A sample of the latter is taken, on which the viscosity is measured using a planar cone viscometer.

[0050] Under the same conditions as the black print hereinbefore, a grey print is made using an ink of the composition described in the table below.

TABLE-US-00002 TABLE 2 MIN AND % BY MAX % COMPONENT CAS NO. WEIGHT BY MASS POLYVINYL BUTYRAL 63148-65-2 13 10/15 WETTING AGENT 27987-25-3 9.5  5/12 CARBON BLACK 133386-4 1.5 0.5/3.sup.  RUTILE TITANIUM 1317-80-2 36 32/42 DIOXIDE DIESTER 627-93-0 23 16/45 1119-40-0 106-65-0 GLYCOL DIETHER 112-49-2 16  0/22 SOLVENT SURFACE TENSION 26376-86-3 1 0.5/2.sup.  MODIFIER

[0051] The glycol diether solvent is triethylene glycol dimethyl ether.

[0052] Prints in any other color are obtained by introducing pigments, dyes or luminophores into the hereinbefore grey ink.

[0053] The pigments, defined in particular by their CAS (Chemical Abstracts Service, American Chemical Society) and CI (Color Index) numbers, can be chosen from the table below.

TABLE-US-00003 TABLE 3 Pigments CAS NO. CI NO. Yellow 13 13515-40-7 Yellow 13 Monoazo yellow 6486-23-3 Yellow 3 Benzimidazolone yellow 31837-42-0 Yellow 151 Monoazo yellow 12225-18-2 Yellow 97 Quinacridone Rose 980-26-7 Red 122 Quinacridone Violet 1047-16-1 Violet 19 Dioxazine Violet 6358-30-1 Violet 23 Carbon black 1333-86-4 Black 7 Black iron oxide 1317-61-9 Phthalocyanine blue 147-14-8 Blue 15.3 Phthalocyanine green 2786-76-7 Green 7 Titanium dioxide 13463-67-7

[0054] Dyes which can be used in the context of the invention, defined by their type and CI number, are the following.

TABLE-US-00004 TABLE 4 Dyes Type CI NO. Yellow Cr complex Yellow 88 Yellow Co complex Yellow 25 Orange Co complex Orange 11 Brown Cr complex Brown 43 Red Cr complex Red 130 Red Cr complex Red 122 Blue Cu - phthalocyanine Blue 136 Blue Cu - phthalocyanine Blue 70 Black Cr complex Black 29

[0055] As examples of luminophores, the following can be used, defined by their formula.

TABLE-US-00005 TABLE 5 Luminophores Formula Green Zn.sub.2SiO.sub.4:Mn Blue BaMgAl.sub.10O.sub.17:Eu Yellow Y.sub.202S:Eu, Sm + BaMgAl.sub.10O.sub.17 Yellow Beta Quinophthalone Red Y.sub.2O.sub.3:Eu Red Y.sub.2O.sub.2S:Eu

[0056] Oxidation of the PVB substrate prior to printing, such as by plasma flaming, promotes this printing.

[0057] All solvent-based inks other than PVB binder (resin), such as epoxy ink, nitrocellulose, polyamide, polyvinyl chloride, and polyurethane, among others, can be used for screen-printing, and all other printing processes: inkjet, offset, flexography, pad printing, digital printing.

[0058] The method of the invention makes it possible to easily obtain [0059] good coverage with a low amount of pinholes that do not affect the transparency in an unacceptable way; [0060] a required opacity corresponding to an optical density of at least 3, or 4 as required, as measured by an X-Rite 341 instrument; [0061] a resolution and a printing aspect of qualities similar to that of enameling on glass.

[0062] The printed laminated glazing produced by the method of the invention allows it to successfully pass the following tests [0063] boil tests of varying application conditions under national/regional regulations, according to the automotive standard R43; [0064] bake tests of varying application conditions under national/regional regulations, according to the automotive standard R43; [0065] heat and moisture resistance of the glazing after H14 aging according to the automotive standard DV471167; and [0066] resistance to aging in severe BF climatic cycles in accordance with the DV471309 automotive standard.