COLOURED LAMINATED GLAZING

Abstract

A process for the manufacture of a colored laminated glazing including at least two glass sheets connected together by a thermoplastic interlayer, includes deposition, by the liquid route, on a first glass sheet, of a polymeric layer including a coloring agent and polymeric compounds, drying and optionally curing of the polymeric layer, assembling of the glass sheet, coated with the colored polymeric layer, with a colorless transparent thermoplastic interlayer and with the second glass sheet, so that the colored polymeric layer is in direct contact with the interlayer, degassing, during which the air trapped between the glass sheets and the thermoplastic interlayer is removed, and heat treatment under pressure and/or under vacuum of the laminated glass at a temperature of between 60 and 200 C., during which the coloring agent present in the polymeric layer migrates toward the thermoplastic interlayer and during which the laminated glazing is assembled.

Claims

1. A process for the manufacture of a colored laminated glazing comprising at least two glass sheets connected together by a thermoplastic interlayer, comprising: depositing, by the liquid route, on a first glass sheet, of a polymeric layer comprising a coloring agent and polymeric compounds, drying and optionally curing of the polymeric layer, assembling of the glass sheet, coated with the colored polymeric layer, with a colorless transparent thermoplastic interlayer and with the second glass sheet, so that the colored polymeric layer is in direct contact with said interlayer, degassing, during which the air trapped between the glass sheets and the thermoplastic interlayer is removed, and heat treatment under pressure and/or under vacuum of the laminated glass at a temperature of between 60 and 200 C., during which the coloring agent present in the polymeric layer migrates toward the thermoplastic interlayer and during which the laminated glazing is assembled.

2. The process as claimed in claim 1, wherein the colored polymeric layer is a layer obtained by curing a composition comprising epoxide compounds or methacrylate compounds.

3. The process as claimed in claim 1, wherein the polymeric layer is obtained from a liquid composition comprising (meth)acrylate compounds chosen from monomers, oligomers or polymers comprising at least one methacrylate functional group.

4. The manufacturing process as claimed in claim 3, wherein the liquid composition comprises at least one aliphatic urethane/acrylate oligomer, at least one mono-, bi- or trifunctional (meth)acrylate monomer, at least one polymerization initiator and at least one coloring agent.

5. The process as claimed in claim 2, wherein the liquid composition comprises, as percentage by weight with respect to the total weight of the (meth)acrylate compounds, from 30% to 80% by weight of at least one aliphatic urethane/acrylate oligomer and from 20% to 70% by weight of at least one mono- or bifunctional (meth)acrylate monomer.

6. The process as claimed in claim 1, wherein the coloring agent represents between 0.01% and 10% by weight, with respect to the total weight of the polymeric compounds.

7. The process as claimed in claim 1, wherein the polymeric layer comprises an adhesion-promoting agent.

8. The process as claimed in claim 1, wherein the polymeric layer is deposited by application, at ambient temperature, of said liquid composition by roll coating, by sprinkling, by dipping, by curtain coating or by spraying.

9. The process as claimed in claim 8, wherein the liquid composition is applied by roll coating or by curtain coating.

10. The process as claimed in claim 1, wherein the polymeric layer is cured by drying at a temperature of less than 200 C., by UV crosslinking or by an electron beam.

11. The process as claimed in claim 1, wherein a thickness of the cured polymeric layer is between 1 and 200 m.

12. The process as claimed in claim 1, further comprising a stage of treatment, by an adhesion-promoting agent, of the surface of the glass sheet on which the colored polymeric layer is deposited and/or of the surface of the face of the thermoplastic interlayer in contact with the polymeric layer.

13. The process as claimed in claim 1, wherein the thermoplastic interlayer is polyvinyl butyral, polyethylene or ethylene/vinyl acetate.

14. A laminated glazing capable of being obtained by the process as claimed in claim 1.

Description

EXAMPLE 1 ACCORDING TO THE INVENTION

[0027] A liquid composition comprising an acrylate oligomer of Sartomer CN9002 (bifunctional aliphatic urethane/acrylate oligomer), CN131B (aromatic monoacrylate monomer) or SR610 (polyethylene glycol acrylate oligomer) type and of SR 410 monomer (monofunctional aromatic acrylic monomer) is prepared with a 50/50 ratio by weight. A dye of anthraquinone type is added to the acrylate formulation in a proportion of 0.5% by weight, with respect to the total of the matrix. An amount of 5% by weight of a photoinitiator of Speedcure 500 type is added to the preceding mixture so as to make possible the initiation of the polymerization. The liquid composition thus obtained is deposited by the liquid route by roll coating on a substrate made of glass. The parameters of the roll are adjusted so as to obtain a wet thickness of 40 m (speed of the applicator roll of between 15 and 25 m/min). The layer thus obtained is cured by UV irradiation (dose of UV-B of 280 mJ/cm.sup.2 approximately, rate of forward progression of 16 m/min). The thickness of the dry colored layer is approximately 30 m. An interlayer made of colorless PVB is positioned on the glass sheet coated with the colored layer and a second glass sheet is positioned on the interlayer, so as to close the laminated glazing. The combination is placed in an autoclave for 30 minutes at 145 C. under a pressure of 10 bar.

[0028] On removing from the autoclave, a colored and transparent laminated glass is obtained.

[0029] Observation with a microscope of the edge face of the laminated glazing thus obtained (see FIG. 1, which corresponds to the observation made with a magnification 10 under monochromatic lighting) shows that the coloring of the interlayer made of PVB (1) is homogeneous. The PVB sheet (1), which is completely tinted red over its entire thickness due to the migration of the dye initially present in the polymeric layer, appears gray with the microscope. The darker bands on the sides of the edge face in the image of FIG. 1 correspond to the shadow generated by the edge of the edge face. The level of gray is measured over a profile corresponding to the zone (2) represented in FIG. 1 with Image J, which gives the gray values as a function of the distance, is constant. This profile, given in FIG. 2, confirms the homogeneity of the coloring.

EXAMPLE 2 ACCORDING TO THE INVENTION

[0030] A liquid composition comprising an acrylate oligomer of Sartomer CN9002 (bifunctional aliphatic urethane/acrylate oligomer), CN131B (aromatic monoacrylate monomer) or SR610 (polyethylene glycol acrylate oligomer) type and of SR 410 monomer (monofunctional aromatic acrylic monomer) is prepared with a 50/50 ratio by weight. A dye of anthraquinone type is added to the acrylate formulation in a proportion of 0.5% by weight, with respect to the total of the matrix. An amount of 5% by weight of a photoinitiator of Speedcure 500 type is added to the preceding mixture so as to make possible the initiation of the polymerization. The liquid composition thus obtained is deposited by the liquid route by roll coating on a substrate made of glass. The parameters of the roll are adjusted so as to obtain a wet thickness of 15 m (speed of the applicator roll of between 15 and 25 m/min). The layer thus obtained is cured by UV irradiation (dose of UV-B of 280 mJ/cm.sup.2 approximately, rate of forward progression of 16 m/min). The thickness of the dry colored layer is approximately 5 m. An interlayer made of colorless PVB is positioned on the glass sheet coated with the colored layer and a second glass sheet is positioned on the interlayer, so as to close the laminated glazing. The combination is placed in an autoclave for 30 minutes at 145 C. under a pressure of 10 bar.

[0031] On removing from the autoclave, a colored and transparent laminated glass is obtained. The molecular migration of the dye from the colored layer toward the PVB interlayer is homogeneous over the entire edge face of the interlayer made of PVB.

EXAMPLE 3 ACCORDING TO THE INVENTION

[0032] A liquid composition comprising an acrylate oligomer of Sartomer CN9002 (bifunctional aliphatic urethane/acrylate oligomer), CN131B (aromatic monoacrylate monomer) or SR610 (polyethylene glycol acrylate oligomer) type and of SR 410 monomer (monofunctional aromatic acrylic monomer) is prepared with a 50/50 ratio by weight. A dye of anthraquinone type is added to the acrylate formulation in an amount of 0.13% by weight. 5% by weight of a photoinitiator of Speedcure 500 type is added to the preceding mixture so as to make possible the initiation of the polymerization. The liquid composition thus obtained is deposited by the liquid route by mechanical coating with a bar coater (tire film) on a substrate made of glass. The parameters are adjusted so as to obtain a wet layer with a thickness of 200 m. The layer thus obtained is cured by UV irradiation (dose of UV-B of 250 mJ/cm.sup.2 approximately, rate of forward progression of 10 m/min). The thickness of the dry colored layer is approximately 150 m. An interlayer made of colorless PVB is positioned on the glass sheet coated with the colored layer and a second glass sheet is positioned on the interlayer, so as to close the laminated glazing. The combination is placed in an autoclave for 45 minutes at 140 C. under a pressure of 10 bar.

[0033] On removing from the autoclave, a colored and transparent laminated glass is obtained. The molecular migration of the dye from the colored layer toward the PVB interlayer is homogeneous over the entire edge face of the interlayer made of PVB.

EXAMPLE 4 ACCORDING TO THE INVENTION

[0034] A liquid composition comprising an acrylate oligomer of Sartomer CN9002 (bifunctional aliphatic urethane/acrylate oligomer), CN131B (aromatic monoacrylate monomer) or SR610 (polyethylene glycol acrylate oligomer) type and of SR 410 monomer (monofunctional aromatic acrylic monomer) is prepared with a 50/50 ratio by weight. A dye of anthraquinone type is added to the acrylate formulation in an amount of 0.5% by weight. 5% by weight of a photoinitiator of Speedcure 500 type is added to the preceding mixture so as to make possible the initiation of the polymerization. The liquid composition thus obtained is deposited by the liquid route by mechanical coating with a bar coater (tire film) on a substrate made of glass. The parameters are adjusted so as to obtain a wet layer with a thickness of 30 m. The layer thus obtained is cured by UV irradiation (dose of UV-B of 250 mJ/cm.sup.2 approximately, rate of forward progression of 10 m/min). The thickness of the dry colored layer is approximately 20 m. An interlayer made of colorless PVB is positioned on the glass sheet coated with the colored layer and a second glass sheet is positioned on the interlayer, so as to close the laminated glazing. The combination is placed in an autoclave for 45 minutes at 140 C. under a pressure of 10 bar.

[0035] On removing from the autoclave, a colored and transparent laminated glass is obtained. The molecular migration of the dye from the colored layer toward the PVB interlayer is homogeneous over the entire edge face of the interlayer made of PVB.

[0036] Charpy impact mechanical strength tests were carried out on approximately ten samples obtained according to examples 1 to 4 described above. These impact tests consist in releasing, from a predetermined height, a pendulum equipped with a spherical impactor made of stainless steel, with an energy of 2.3 J, onto laminated glazing samples with a surface area of 49 cm.sup.2 consisting, in thickness, of two glass sheets of 2 mm, of the colored layer of a few m and of the PVB interlayer of 0.8 mm, and in measuring the loss in weight of the glazing after the impact. The majority of the glazings tested showed that the face on which the polymeric layer is deposited is not broken. Moreover, the samples show that the loss in weight is always less than 1%, indeed even very often less than 0.2%, which reflects a very good mechanical strength of the samples tested.

[0037] The safety performance qualities of the laminated glazing obtained by the process according to the present invention are thus indeed retained.