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US 5,616,369 AGranted
Process for barrier coating of plastic objects
AssigneeBecton, Dickinson and Company
InventorsJoel L. Williams, Susan L. Burkett, Shel McGuire
Life of this patent
Estimating the term…
Abstract
A method for sequentially depositing a silicon oxide based film as a barrier on a substrate. The film 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.
Claims20
A method of sequentially depositing a silicon oxide based film on a plastic substrate in a previously evacuated chamber by glow discharge comprising:
- (a) placing a plastic substrate into a chamber;
- (b) evacuating said chamber;
- (c) controllably flowing oxygen into said chamber;
- (d) establishing a glow discharge plasma in the chamber from said oxygen component;
- (e) depositing a plasma of oxygen onto said plastic substrate;
- (f) shutting down said chamber and evacuating;
- (g) vaporizing an organosilicon component and admixing the volatilized organosilicon component with an oxidizer component and an inert gas component to form a gas stream exterior the chamber;
- (h) controllably flowing the gas stream into the plasma;
- (i) establishing a glow discharge plasma in the chamber from said gas stream;
- (j) depositing a coating of silicon oxide on said plastic substrate;
- (k) removing and/or redistributing foreign surface particles from said plastic substrate;
- and
- (l) repeating steps g through j above, thereby depositing another coating of silicon oxide on said plastic substrate.
10 more elements
A method of depositing a film on a plastic substrate by a plasma process in an evacuated chamber, comprising the steps of:
- (a) placing a plastic substrate into a chamber;
- (b) evacuating said chamber;
- (c) controllably flowing oxygen stream into said chamber;
- (d) establishing a glow discharge plasma in the chamber from said oxygen stream;
- (e) depositing a plasma of oxygen onto said plastic substrate;
- (f) shutting down said chamber and evacuating;
- (g) providing said evacuated chamber with a gas stream that includes a source of a material desired to be deposited on said plastic substrate;
- (h) establishing within said chamber a glow discharge plasma derived from the gas of said stream in a region of high electric field;
- (i) removably positioning the plastic substrate in said plasma without any electrical connection therewith;
- (j) generating within said plasma a magnetic field having a substantial magnetic flux directed against said plastic substrate, thereby depositing a first coating of a silicon oxide based film on said plastic substrate;
- (k) removing and/or redistributing foreign surface particles from said plastic substrate;
- and
- (l) repeating steps (f) through (j) above, thereby depositing another coating of silicon oxide on said plastic substrate.
10 more elements
Dependencies are inferred from the claim text.