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US 5,364,666 AGranted
Process for barrier coating of plastic objects
AssigneeBecton, Dickinson and Company
InventorsJoel L. Williams, Susan L. Burkett, Shel McGuire
Life of this patent
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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) 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;
- (b) controllably flowing the gas stream into said chamber;
- (c) establishing a glow discharge plasma in the chamber from said gas stream;
- (d) controllably flowing the gas stream into the plasma while confining at least a portion of the plasma therein;
- (e) depositing a first coating of silicon oxide on said substrate;
- (f) removing and/or redistributing foreign surface particles from said substrate;
- and
- (g) repeating steps (a) through (d) above, thereby depositing a second coating of a silicon oxide on said substrate.
5 more elements
A method of depositing a film on a plastic substrate by a plasma process within an evacuated chamber, comprising the steps of:
- (a) providing an evacuated chamber with a gas stream that includes a source of a material desired to be deposited on said substrate:
- (b) establishing within said chamber a glow discharge plasma derived from the gas of said stream in a region of high electric field;
- (c) removably positioning tile plastic substrate in said plasma without any electrical connection therewith;
- (d) generating within said plasma a magnetic field having a substantial magnetic flux directed against said substrate, thereby depositing a first coating of a silicon oxide based film on said substrate;
- (e) removing and/or redistributing foreign surface particles from said substrate;
- and
- (f) repeating steps (a) through (d) above, thereby depositing a second coating of a silicon oxide based film on said substrate.
4 more elements
Dependencies are inferred from the claim text.