HOLLOW GLASS PACKAGING OBJECT OR CONTAINER HAVING AN EXTERNAL ANTI-MIST COATING

Abstract

The present invention relates to a hollow glass, such as a bottle, glass, flask or pot, consisting of a glass substrate having, on at least one portion of its outer wall, a hydrophilic organic coating, for instance based on polyvinyl alcohol crosslinked with at least one acid selected from citric acid, polyacrylic acid and poly(acrylic acid-co-maleic acid).

In order to manufacture this hollow glass, a solution containing the ingredients for forming the coating and at least one solvent is applied to the glass substrate by spraying, dip-coating or, when the hydrophilic organic coating is a partial coating, by spraying onto the outer wall of the glass substrate on which a mask has been applied, or by screenprinting; the glass substrate coated with said solution is dried; and the substrate is cured thermally or by UV radiation or by electron beam. It is possible to use this hollow glass for revealing a pattern thereon when said hollow glass is removed from a cold storage zone.

Claims

1. A hollow glass packaging container or article, comprising: a glass substrate and, on at least one portion of an outer wall of the glass substrate, an anti-water condensation hydrophilic organic coating.

2. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating is based on polyvinyl alcohol (PVA) crosslinked with at least one acid (A) selected from the group consisting of citric acid (CA), polyacrylic acid and poly(acrylic acid-co-maleic acid).

3. The packaging container or article as claimed in claim 2, wherein a PVA/A weight ratio is from 30/70 to 60/40.

4. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating further comprises at least one antifoaming agent.

5. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating further comprises at least one wetting agent.

6. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating further comprises at least one thickening/shear-thinning agent.

7. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating based on PVA+A further comprises at least one esterification catalyst agent.

8. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating is based on at least one polyurethane (PU) and on at least one hygroscopic polymer.

9. The packaging container or article as claimed in claim 8, wherein the hygroscopic polymer is a polyvinylpyrrolidone.

10. The packaging container or article as claimed in claim 8, wherein a PU/hygroscopic polymer(s) weight ratio is from 1/1000 to 1/1.

11. The packaging container or article as claimed in claim 8, wherein the hydrophilic organic coating further comprises at least one flow agent.

12. The packaging container or article as claimed in claim 1, wherein the glass substrate is selected from the group consisting of glass, quartz glass, borosilicate glass, soda-lime glass and organic glasses.

13. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating is bonded to the glass substrate by an adhesion promoter layer.

14. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating has a layer thickness of from 0.1 μm to 250 μm and wherein an optional adhesion promoter layer, if present, has a thickness of from 2 to 100 μm.

15. The packaging container or article as claimed in claim 1, wherein the hydrophilic organic coating has been applied to the outer wall of the glass substrate, thereby forming a negative or positive pattern.

16. A process for manufacturing the packaging container or article of claim 1, the process comprising: (a) applying a solution comprising ingredients suitable for forming the hydrophilic organic coating and at least one solvent to the glass substrate by spraying, dip-coating or, when the hydrophilic organic coating is a partial coating, by spraying onto the outer wall of the glass substrate on which a mask has been applied, or by screenprinting; (b) drying the glass substrate coated with said solution; and (c) curing said substrate thermally or by UV radiation or by electron beam, wherein the process optionally further comprises applying an adhesion promoter layer to the glass substrate before the applying (a).

17. The process as claimed in claim 16, wherein the applying (a) comprises preparing a mixture of PVA, of A, of optional antifoaming, wetting, thickening/shear-thinning and/or catalyst agents, and of water as solvent, said mixture has a final solids content of from 10% to 50% by weight; the drying (b), is at 30-70° C.; and the curing (c), comprises raising a temperature of the glass substrate to 90-150° C.

18. The process as claimed in claim 16, wherein the hydrophilic organic coating is based on at least one polyurethane (PU) and on at least one hygroscopic polymer, the applying (a) comprises preparing a solution that comprises isocyanate and polyol compound(s) suitable for forming the at least one polyurethane by polyaddition, optionally at least one catalyst for forming the at least one polyurethane, the at least one hygroscopic polymer, optionally flow agent(s), and at least one solvent; the drying (b) comprises drying the glass substrate and thereby eliminating the solvent; and the curing (c) comprises bringing a temperature to 100-150° C.

19. The process as claimed in claim 18, wherein the isocyanate compound comprises at least 1,6-hexamethylene diisocyanate, an oligomer of 1,6-hexamethylene diisocyanate or a homopolymer of 1,6-hexamethylene diisocyanate; the polyol compound comprises at least polyethylene glycol, polypropylene ether glycol and/or 1,4-butanediol; and the solution comprises a catalyst.

20. A method of revealing a pattern, the method comprising: removing the packaging container or article of claim 15 from a cold storage zone, thereby revealing the pattern.

Description

EXAMPLE 1

[0056] The following formulation was prepared for an organic anti-fogging layer:

TABLE-US-00001 PVA 24.15 g CA 20.84 g Water 55.00 g Antifoaming agent sold by the company  1.25 g BYK under the trademark BYK ®-016

[0057] The water of the formulation was placed in a reactor and brought to 50° C. over 20 minutes, then the CA was added, with everything being stirred at 150 rpm.

[0058] When the CA had been dissolved, the temperature of the mixture was brought to 90° C. over 20 minutes.

[0059] The PVA was then added. The formulation was kept at 90° C. for 4 h until the PVA had completely dissolved.

[0060] The formulation was then cooled to 50° C. over 30 minutes and the antifoaming agent was added thereto.

[0061] The formulation was then decanted into containers. This formulation has a rheology suitable for the screenprinting deposition technique.

[0062] Ovation (transparent clear glass) and champagne (green glass) bottles were then subjected to a silicate flame treatment in order to promote the adhesion with the organic anti-fogging layer. Next, the formulation prepared above was deposited by the screenprinting technique on the bottles thus prepared, in order to form a decorative pattern on each of them.

[0063] The bottles were dried at 50° C. for 15 minutes in order to evaporate the water, then they were heated at 120° C. for 40 minutes in order to bring about the crosslinking of the PVA with the CA.

[0064] They were left to cool to ambient temperature.

[0065] The bottles were then placed in the freezer at −18° C. for 1 h. The bottles were removed from the refrigerator once they were chilled. The desired decorative pattern then appeared via the formation of fogging solely on the uncoated portions of the bottles, by contrast with the transparent coated zones.

EXAMPLE 2

[0066] The following formulation was prepared for an organic anti-fogging layer:

TABLE-US-00002 Ingredient Parts by weight Isocyanate sold by the company 20.440 Bayer under the trademark Desmodur N3200 PEG 11.185 PVP 3.579 DBTL 0.099 Polydimethylsiloxane sold by 0.138 the company BYK under the trademark BYK ®-370 DAA 64.649

[0067] Removable adhesive films were applied to ovation (transparent clear glass) and champagne (green glass) bottles, which films were cut to form two types of pattern: negative and positive.

[0068] A solution of amino-functional silane was sprayed onto these bottles, then the bottles were dip-coated in the previously prepared anti-fogging solution.

[0069] The bottles were dried at 50° C. for 15 minutes (drying phase with evaporation of the solvent), then the bottles were heated at 120° C. for 40 minutes (crosslinking of the isocyanate with the polyol in the presence of the catalyst). They were left to cool to ambient temperature and then the masking films were removed in order to reveal the uncoated portions.

[0070] The bottles were then placed in the refrigerator at 0° C. for 1 h. The bottles were removed once they were chilled. The desired decorative pattern then appeared via the formation of fogging solely on the uncoated portions of the bottles, by contrast with the transparent coated zones.

EXAMPLE 3

[0071] The following formulation was prepared for an organic anti-fogging layer:

TABLE-US-00003 PVA 35.01 g Poly(acrylic acid-co-maleic acid)  9.98 g Water 55.00 g Antifoaming agent sold by the company  1.25 g BYK under the trademark BYK ®-016

[0072] The water of the formulation was placed in a reactor and brought to 50° C. over 20 minutes, then the poly(acrylic acid-co-maleic acid) was added, with everything being stirred at 150 rpm.

[0073] When the poly(acrylic acid-co-maleic acid) had been dissolved, the temperature of the mixture was brought to 50° C. over 20 minutes.

[0074] The PVA was then added. The formulation was kept at 90° C. for 4 h until the PVA had completely dissolved.

[0075] The formulation was then cooled to 50° C. over 30 minutes and the antifoaming agent was added thereto.

[0076] The formulation was then decanted into containers.

[0077] Removable adhesive films were applied to ovation (transparent clear glass) and champagne (green glass) bottles, which films were cut to form two types of pattern: negative and positive.

[0078] The bottles were then subjected to a silicate flame treatment in order to promote the adhesion with the organic anti-fogging layer, and then the formulation prepared above was applied to the bottles thus prepared, in order to form a decorative pattern on each of them.

[0079] The bottles were dried at 50° C. for 15 minutes in order to evaporate the water, then they were heated at 120° C. for 40 minutes in order to bring about the crosslinking of the PVA with the poly(acrylic acid-co-maleic acid).

[0080] They were left to cool to ambient temperature and then the masking films were removed in order to reveal the uncoated portions.

[0081] The bottles were then placed in the freezer at 0° C. for 1 h. The bottles were removed from the refrigerator once they were chilled. The desired decorative pattern then appeared via the formation of fogging solely on the uncoated portions of the bottles, by contrast with the transparent coated zones.