Patent US4131691A successfully refreshed from Google Patents.
US4131691A
Expired / Lapsed
US
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Coating a substrate by glow discharge graft polymerization
Assignee: Plasma Physics Corp
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Filing: 1977-09-22
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Granted: 1978-12-26
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Expires: 1997-09-22
Abstract
Abstract A method of coating a substrate in an electrical discharge plasma, which comprises establishing a zone of electrical glow discharge plasma in a gaseous medium comprising at least about 25%, by weight, of water vapor, based on the total weight of the gaseous medium, and exposing said substrate to said plasma in said zone then exposing the substrate to an ethylenically unsaturated monomer whereby the monomer is grafted onto the substrate.
Inventors
- 👤 John R. Morley
- 👤 Ralph E. Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:00
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; D; D06; D06M; D06M14/00; D06M14/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A method of graft polymerizing a monomer on a substrate, comprising passing a substrate through a zone of electrical glow discharge plasma in a gaseous medium comprising at least about 25%, by weight, of water vapor, based on the total weight of the gaseous medium, thereby exposing said substrate to said plasma in said zone to generate free radical sites on said substrate, and subsequently exposing the substrate containing said free radical sites to an ethylenically unsaturated monomer to form a graft polymer thereof on said substrate.
Claim 2
Independent Claim
87 words
A method of graft polymerizing a monomer on a substrate, comprising passing a substrate through a zone of electrical glow discharge plasma in a gaseous medium comprising at least about 25%, by weight, of water vapor, based on the total weight of the gaseous medium, thereby exposing said substrate to said plasma in said zone to generate free radical sites on said substrate, and subsequently exposing the substrate containing said free radical sites to an ethylenically unsaturated monomer to form a graft polymer thereof on said substrate.
Claim 3
Dependent Claim
33 words
The method according to claim 1, wherein said zone has an inlet and an outlet, and said substrate is passed continuously through said plasma in said zone from said inlet to said outlet.
Claim 4
Dependent Claim
21 words
The method according to claim 2, wherein said gaseous medium comprises about 50 to about 100%, by weight, of water vapor.
Claim 5
Dependent Claim
15 words
The method according to claim 1, wherein said gaseous medium consists essentially of water vapor.
Claim 6
Dependent Claim
19 words
The method according to claim 1, wherein said zone is at a pressure of less than about 10 Torr.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |