Patent US3773544A successfully refreshed from Google Patents.
US3773544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorocarbon polymer coated substrate
Assignee: STEEL CORP
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Filing: 1971-06-01
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Granted: 1973-11-20
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Expires: 1991-06-01
Abstract
Abstract A process for preparing a fluorocarbon polymer coated substrate includes heating a surface coating containing a fluorocarbon polymer and a copolymer based on vinylidene chloride, the surface coating being on a priming coating containing chromium oxide, or chromium oxide with chromium, such that the heating decomposes the copolymer to etch the priming coating to key the fluorocarbon polymer to the priming coating.
Inventors
- 👤 D Newton
- 👤 P Winchcombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:47
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/12; Y10T428/12451; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12556; Y10T428/12569; Y10T428/12583; Y10T428/1259; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/31504; Y10T428/3154; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
14 words
A process as claimed in claim 1, in which the substrate is a metal.
Claim 2
Dependent Claim
20 words
A process as claimed in claim 1, in which the heating is carried out in the range 340* to 370*C.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1, in which the heating is stopped when the copolymer has fully decomposed.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1 in which the fluorocarbon polymer is a polytetrafluoroethylene.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1 in which the fluorocarbon polymer is a copolymer of tetrafluoroethylene and hexafluoropropylene.
Claim 6
Dependent Claim
15 words
A process as claimed in claim 1 in which the fluorocarbon polymer is a polychlorotrifluoroethylene.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 1 in which the fluorocarbon polymer is a polyvinylidenefluoride.
Claim 8
Dependent Claim
30 words
A process as claimed in claim 8 in which the surface coating had been formed by application of a fluid dispersion containing the fluorocarbon polymer and the vinylidene chloride copolymer.
Claim 9
Dependent Claim
58 words
A process as claimed in claim 9, in which the fluid dispersion is a dispersion, in a liquid that may be volatilized, of a polytetrafluoroethylene and a vinylidene chloride copolymer, and wherein the copolymer corresponds to 95 to 70 percent by weight of vinylidene chloride and 5 to 30 percent by weight of copolymerizable ethylenically unsaturated monomeric material.
Claim 10
Dependent Claim
16 words
A process as claimed in claim 9, in which the fluid dispersion is an aqueous dispersion.
Claim 11
Dependent Claim
58 words
A process as claimed in claim 11, in which the aqueous dispersion contains (a) a polytetrafluoroethylene in the form of approximately spherical colloidal particles having an average diameter of 0.15 to 0.20 and Mu and containing 6 percent by weIght of a polymeric non-ionic surface active agent; and (b) a copolymer of vinylidene chloride, acrylonitrile and acrylic acid.
Claim 12
Dependent Claim
34 words
A process as claimed in claim 12, in which the aqueous dispersion contains 45 to 65 percent by weight of the polytetrafluoroethylene and 55 to 35 percent by weight of the vinylidene chloride copolymer.
Claim 13
Dependent Claim
17 words
A process as claimed in claim 1 in which the priming coating is an electrochemically deposited coating.
Claim 14
Dependent Claim
19 words
A process as claimed in claim 14, in which the priming coating consists of chromium oxide in hydrated form.
Claim 15
Dependent Claim
31 words
A process as claimed in claim 14, in which the priming coating has a composite structure with chromium metal adjacent to the substrate and chromium oxide in hydrated form on top.
Claim 16
Dependent Claim
34 words
A process as claimed in claim 1, in which the heating is at a temperature at which said fluorocarbon polymer begins to fuse or sinter to below the decomposition temperature of said fluorocarbon polymer.
Claim 17
Dependent Claim
58 words
A process as claimed in claim 1, in which said ethylenically unsaturated monomers copolymerizable with said vinylidene chlorides are (a) monoethylenically unsaturated mono- or poly-carboxylic acids and their esters, anhydrides and nitriles, (b) esters of mono- or poly-carboxylic fatty acids and mono-ethylenically unsautrated alcohols, (c) halogen-substituted derivatives of ethylene, (d) mono-ethylenically unsaturated aldehydes and ketones, or (e) dienes.
Claim 18
Dependent Claim
51 words
A process as claimed in claim 18, wherein said ethylenically unsaturated monomers are acrylic acid, Alpha -chloro-acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, mesaconic acid, aconitic acid, itaconic acid, and their esters, anhydrides and nitriles, vinyl esters of mono-carboxylic fatty acids, vinyl halides, methacrolein, vinylmethylketone, isoprene or butadiene.
Claim 19
Dependent Claim
39 words
A fluorocarbon polymer coated substrate in which the fluorocarbon polymer is keyed to an etched surface of a priming coating having a composite structure with chromium metal adjacent to the substrate and chromium oxide in hydrated form on top.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |