Coating composition containing an epoxide additive and structures coated therewith
AssigneeThe Coca-Cola Company
InventorsYu Shi, Lawrence S. Mucha
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Abstract
Coatings are provided to give polymeric structures a top coat that improves the gas barrier properties of the structure while enhancing the water resistance of the top coating and while improving the adhesion of the top coat to an underlying layer of the structure. These top coat compositions comprise an organic barrier coating material in combination with an epoxide additive which enhances the water resistance, adhesion, gas barrier, or a combination thereof, of the top coat barrier layer. Multilayer structures having this top coat are also provided, particularly in the form of containers for food and beverage packaging.
Claims34
A coated structure comprising:
- a thermoplastic polymeric base layer;
- an inorganic gas barrier layer on the polymeric base layer;
- and
- a top coat barrier layer coated on the inorganic gas layer, the top coat barrier layer comprising an organic compound capable of reducing the permeability of the structure to gas or vapor, and an epoxide additive which enhances the water resistance, adhesion, gas barrier, or a combination thereof, of the top coat barrier layer,
- wherein the organic compound is selected from the group consisting of polyhydroxyaminoethers, polyetheramines, polyetheramine salts, polyacrylics, and carboxy methylcellulose.
A method for reducing the permeability of vapor or gas through a structure comprising a rigid polymeric base layer, the method comprising:
- coating the rigid polymeric base layer with an inorganic oxide layer;
- applying to the inorganic oxide layer a solution, dispersion, or emulsion, which comprises (i) an organic compound capable of reducing the permeability of the structure to gas or vapor, and (ii) an epoxide additive, to form a wet coating, wherein the solution, dispersion, or emulsion is aqueous;
- and
- drying the wet coating to form a top coat barrier layer on the structure, wherein the epoxide additive enhances the water resistance, adhesion, gas barrier, or a combination thereof, of the top coat barrier layer.
A polymeric container for packaging a beverage comprising:
- a bottle having a polyester base layer;
- an inorganic gas barrier layer deposited on the base layer;
- and
- a top coat barrier layer coated on the inorganic gas layer,
- wherein the top coat barrier layer comprises a polyhydroxyaminoether, which is cross-linked by a multi-functional epoxide additive which enhances the water resistance, adhesion, gas barrier, or a combination thereof, of the top coat barrier layer.
Dependencies are inferred from the claim text.