US4176209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming polymeric paraxylylene coatings and films possessing improved oxidation resistance
Assignee: Raytheon Co
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Filing: 1978-01-09
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Granted: 1979-11-27
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Expires: 1998-01-09
Abstract
Abstract Polymeric paraxylylene coatings and films possessing significantly improved oxidation resistance, particularly at elevated temperatures, are disclosed as well as a process for their preparation wherein certain antioxidants are vaporized and codeposited with vaporous poly(paraxylylene) precursors onto a substrate.
Inventors
- 👤 Thomas E. Baker
- 👤 George L. Fix
- 👤 John S. Judge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:19
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/60; C; C08; C08G; C08G61/00; C08G61/02; C08G61/025; C08J; C08J3/00; C08J3/20; C08G2261/00; C08G2261/30; C08G2261/34; C08G2261/342; C08G2261/3424; C08J2365/00; C08J2365/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
In a chemical vapor deposition process for forming polymeric paraxylylene including the steps of producing vaporous polymeric paraxylylene precursor and subsequently condensing said precursor; the improvement comprising condensing vaporized antioxidant simultaneously with said precursor, said antioxidant being a vaporizable and vapor-transportable material, to thereby incorporate said antioxidant into the polymeric paraxylylene formed.
Claim 2
Dependent Claim
52 words
In a chemical vapor deposition process for forming polymeric paraxylylene including the steps of producing vaporous polymeric paraxylylene precursor and subsequently condensing said precursor; the improvement comprising condensing vaporized antioxidant simultaneously with said precursor, said antioxidant being a vaporizable and vapor-transportable material, to thereby incorporate said antioxidant into the polymeric paraxylylene formed.
Claim 3
Dependent Claim
56 words
The improvement of claim 1 wherein said vaporous polymeric paraxylylene precursor comprises vaporous paraxylylene diradicals produced by the pyrolytic cleavage of a cyclic paraxylylene dimer represented by the structural formula, ##STR5## wherein R is an aromatic ring substituent, x and y are each integers from 0 to 3, inclusive, and R' is H, Cl or F.
Claim 4
Dependent Claim
12 words
The improvement of claim 2 wherein said vaporous paraxylylene diradicals comprise paraxylylene.
Claim 5
Dependent Claim
13 words
The improvement of claim 2 wherein said vaporous paraxylylene diradicals comprise monochloroparaxylylene diradicals.
Claim 6
Dependent Claim
13 words
The improvement of claim 2 wherein said vaporous paraxylylene diradicals comprise dichloroparaxylylene diradicals.
Claim 7
Dependent Claim
45 words
The improvement of claim 2 wherein said vaporous cyclic paraxylylene dimer and said vaporized antioxidant are combined in a single vapor stream, said antioxidant being vaporizable within the range of temperatures at which said precursor material vaporizes to produce a vaporized antioxidant which is vapor-transportable.
Claim 8
Dependent Claim
21 words
The improvement of claim 2 wherein said vaporous cyclic paraxylylene dimer and said vaporized antioxidant are maintained in separate vapor streams.
Claim 9
Dependent Claim
26 words
The improvement of claim 7 wherein the rate of condensation of said antioxidant is varied to provide an antioxidant concentration gradient in the polymeric paraxylylene formed.
Claim 10
Dependent Claim
34 words
The improvement of claim 8 wherein the rate of condensation of antioxidant is increased as the polymeric paraxylylene is formed to provide an increasing concentration of antioxidant toward the surface of said polymeric paraxylylene.
Claim 11
Dependent Claim
38 words
The improvement of claim 2 wherein said antioxidant is represented by a structural formula selected from ##STR6## wherein R 1 -R 7 are individually selected from hydrogen, halogen, aliphatic or aromatic alkane, alkene, ether, and anhydride or ester.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |