Glass container with improved coating
The invention is directed to a glass container having provided on at least one surface thereof a polymer based coating and/or a polymer label, said surface being provided with a precoating of at least one polyvinyl alcohol, underneath said polymer based coating and/or a polymer label.
1. Glass container having provided on at least one surface thereof a polymer based coating and/or a polymer label, said surface being provided with a precoating of at least one polyvinyl alcohol in an amount of up to 2 mg/dm 2 , underneath said polymer based coating and/or a polymer label.
2. Container according to claim 1 , wherein the said surface has been provided with a label.
3. Container according to claim 2 , wherein said label is based on a polymeric film carrying label graphics or on an ink-only image transfer system.
4. Container according to claim 1 , wherein said coating is durable, lubris, highly impact resistant and enhances the appearance of the glass container to which it is applied.
5. Container according to claim 4 , wherein the said coating is applied over a label.
6. Container according to claim 4 , wherein the said label is a polymeric or a paper label.
7. Container according to claim 1 , wherein the polyvinyl alcohol coating is applied over a silane treated glass surface, or a silane treatment is applied over the polyvinyl alcohol coating.
8. Container according to claim 1 , wherein a silane modified polyvinyl alcohol is used.
9. Container according no claim 1 , wherein a further coating, such as a polyethylene coating is applied over the polyvinyl alcohol coating label.
10. Container according to claim 1 , wherein the polyvinyl alcohol has a molecular weight of 10,000 to 500,000.
11. Container according to claim 1 , wherein the polyvinyl alcohol is defined by a degree of hydrolysis of over 87%.
12. Container according to claim 1 , wherein the amount of polyvinyl alcohol coating is between 0.2 and 2 mg/dm 2 .
13. Container according to claim 1 , wherein the amount of polyvinyl alcohol coating is such that the surface has a slip angle of 14 to 25°.
14. Process for providing a coated and/or labelled glass container, said process comprising providing a glass container, applying a polyvinyl alcohol precoating on the glass container by treating the surface of the said glass container with an aqueous solution of the polyvinyl alcohol drying the precoating to provide said precoating in a amount of up to 2 mg/dm 2 and applying a label and/or a further coating over the precoating.
15. Process according to claim 14 , wherein the amount of polyvinyl alcohol coating is between 0.2 and 2 mg/dm 2 .
16. Process according to claim 14 , wherein the aqueous solution contains between 0.1 wt %, of polyvinyl alcohol.
17. Process according to claim 14 , wherein the aqueous solution is applied by spraying, dipping or roller coating.
18. Process according to claim 14 , wherein the precoating is applied at a temperature of between 150 and 250° F.
19. Process according to claim 14 , wherein the precoating is applied on the surface of silane treated glass or a silane treatment is applied on the precoating.
20. Process according to claim 14 , wherein a label based on a polymeric film carrying label graphics or on an ink-only image transfer system is applied over the precoating.
21. Process according to claim 14 , wherein a further polyethylen coating is applied.
22. Process according to claim 14 , wherein a further coating which is durable, highly impact resistant and enhances the appearance of the glass container, is applied over the said polyvinyl alcohol precoating.
23. Process according to claim 22 , wherein the said coating is selected from the group of curable acrylics, urethanes, acrylic-urethanes and epoxies.
24. Process according to claim 14 , wherein the said polyvinyl alcohol coating is applied on uncoated glass.