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US 6,165,566 AGranted
Method for depositing a multilayer barrier coating on a plastic substrate
AssigneeBecton, Dickinson and Company
InventorYelena G. Tropsha
Life of this patent
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Abstract
The present invention is a plastic container coated with a multi-layer barrier coating. The multi-layer barrier coating is useful for providing an effective barrier against gas permeability in containers and for extending shelf-life of containers, especially plastic evacuated blood collection devices.
Claims5
A method of depositing a multilayer barrier coating on a plastic substrate comprising:
- (a) selecting a curable component comprising:
- i) polyfunctional acrylates, or ii) mixtures of monoacrylates and polyfunctional acrylates;
- (b) flash vaporizing said component into said chamber;
- (c) condensing a first layer of an acrylate film of said vaporized component onto the outer surface of said substrate;
- (d) curing said acrylate film;
- (e) vaporizing an organosilicon component and admixing a volatilized organosilicon component with an oxidizer component and optionally an inert gas component to form a gas stream exterior to the chamber;
- (f) establishing a glow discharge plasma in the chamber from one or more of the gas stream components;
- (g) controllably flowing the gas stream into the plasma while confining at least a portion of the plasma therein;
- (h) depositing a coating of silicon oxide adjacent said first layer;
- (i) repeating steps (a) through (d) above, thereby depositing an acrylate coating on said silicon oxide coating;
- and
- (j) repeating steps (e) through (h) above, thereby depositing a silicon oxide coating on said acrylate coating.
9 more elements
Dependencies are inferred from the claim text.