Hollow glass packaging object or container having an external anti-mist coating
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.
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,
wherein the hydrophilic organic coating has been applied to the outer wall of the glass substrate, thereby forming a negative or positive pattern.
2. The packaging container or article as claimed in claim 1 , wherein the hydrophilic organic coating further comprises at least one antifoaming agent.
3. The packaging container or article as claimed in claim 1 , wherein the hydrophilic organic coating further comprises at least one wetting agent.
4. The packaging container or article as claimed in claim 1 , wherein the hydrophilic organic coating further comprises at least one thickening/shear-thinning agent.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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).
10. The packaging container or article as claimed in claim 9 , wherein a PVA/A weight ratio is from 30/70 to 60/40.
11. 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.
12. The packaging container or article as claimed in claim 11 , wherein the hygroscopic polymer is a polyvinylpyrrolidone.
13. The packaging container or article as claimed in claim 11 , wherein a PU/hygroscopic polymer(s) weight ratio is from 1/1000 to 1/1.
14. The packaging container or article as claimed in claim 11 , wherein the hydrophilic organic coating further comprises at least one flow agent.
15. 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).
16. The process as claimed in claim 15 ,
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.
17. The process as claimed in claim 15 ,
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.
18. The process as claimed in claim 17 , 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.
19. A method of revealing a pattern, the method comprising:
removing the packaging container or article of claim 1 from a cold storage zone, thereby revealing the pattern.