Transparent barrier coatings exhibiting reduced thin film interference
First Claim
1. A barrier-coated polymeric article comprising a polymeric substrate coated with an inorganic barrier layer, said barrier layer formed by drying on the surface of said article a coating solution comprising a metal polysilicate solution and nanocrystalline titanium dioxide, wherein said coated article is characterized by impermeability to gases, vapors, and aromas, and reduced interference between light reflected from the surface of said barrier layer and the interface between said barrier layer and the polymeric substrate.
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Abstract
A vapor barrier coating solution for poly(ethylene terephthalate) (PET) polymeric articles contains a metal polysilicate and transparent nanocrystalline titanium dioxide. The coating reduces interference between light reflected from the top surface of a coated PET polymeric article and the interface between the dried coating and said PET polymeric article. The coated articles are also provided.
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Citations
25 Claims
- 1. A barrier-coated polymeric article comprising a polymeric substrate coated with an inorganic barrier layer, said barrier layer formed by drying on the surface of said article a coating solution comprising a metal polysilicate solution and nanocrystalline titanium dioxide, wherein said coated article is characterized by impermeability to gases, vapors, and aromas, and reduced interference between light reflected from the surface of said barrier layer and the interface between said barrier layer and the polymeric substrate.
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15. A method for producing an improved poly(ethylene terephthalate) polymeric article comprising coating said article with a coating solution comprising a metal polysilicate solution and nanocrystalline titanium dioxide;
- drying said solution into an inorganic barrier layer; and
reducing interference between light reflected from the top surface of the coated article and the interface between the inorganic barrier layer and said article. - View Dependent Claims (24, 25)
- drying said solution into an inorganic barrier layer; and
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22. A barrier-coated polymeric article comprising a substantially transparent polymeric substrate having a bulk-averaged refractive index greater than 1.55, coated with a substantially transparent, inorganic barrier layer comprising a metal polysilicate and up to about 25% by weight of nanocrystalline titanium dioxide, said barrier layer formed by drying on the surface of said substrate a coating solution comprising a metal polysilicate solution and nanocrystalline titanium dioxide having an average particle size of less than about 100 nm, wherein said coated article is substantially transparent, substantially impermeable to gases, vapors, and aromas, and has reduced optical interference between light reflected from the surface of said inorganic barrier layer and the interface between said barrier layer and the polymeric substrate.
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23. A barrier-coated, polymeric article comprising a poly(ethylene terephthalate) substrate coated with an inorganic barrier layer comprising less than about 25% by weight of nanocrystalline titanium dioxide, said barrier layer formed by drying on the surface of said article a coating solution comprising a metal polysilicate solution and nanocrystalline titanium dioxide having an average particle size of less than about 100 nm, wherein said coated article is substantially transparent, and substantially impermeable to gases, vapors, and aromas, and has reduced interference between light reflected from the surface of said barrier layer and the interface between said barrier layer and the substrate.
Specification