Patent US4264650A successfully refreshed from Google Patents.
US4264650A
Expired / Lapsed
US
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Method for applying stress-crack resistant fluoropolymer coating
Assignee: Solvay Solexis Inc
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Filing: 1979-02-01
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Granted: 1981-04-28
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Expires: 1999-02-01
Abstract
Abstract Disclosed is a method for coating substrates with a stress-crack resistant coating of a fluoropolymer and a polyfunctional compound having two or more allyl groups such as triallylcyanurate or triallylisocyanurate wherein the fluoropolymer is a polymer comprised of ethylene, chlorotrifluoroethylene or tetrafluoroethylene and optionally a termonomer such as 3,3,3-trifluoro-2-trifluoromethyl propene. The ingredients are homogeneously blended and applied to the substrate which is maintained at an elevated temperature to allow flow-out of the coating mixture thereby forming a stress-crack resistant coating.
Inventors
- 👤 Stephen R. Schulze
- 👤 Elmer C. Lupton
- 👤 William A. Miller
- 👤 Robert H. Hutzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:55
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; C; C08; C08F; C08F259/00; C08F259/08
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
223 words
A method for coating substrates with a stress-crack resistant fluoropolymer coating without irradiation, said method comprising: (a) preparing a homogeneous coating mixture comprised of a fluoropolymer and about 0.05 to 15 weight percent, based on the total weight of ingredients, of a polyfunctional monomer containing two or more allyl groups, wherein the fluoropolymer is selected from the group consisting of: (aa) a copolymer containing units derived from ethylene and a monomer selected from the group consisting of chlorotrifluoroethylene and tetrafluoroethylene or mixtures thereof, and (ab) a polymer comprised of from about 40 to 60 mol percent ethylene, about 60 to 40 mol percent chlorotrifluoroethylene and about 0.1 to 10 mol percent of a fluorinated termonomer selected from the group consisting of 3,3,3-trifluoro-2-trifluoromethyl propene, hexafluoroacetone, a vinyl monomer which is free of telogenic activity and which provides a side chain having at least two carbon atoms, the side chain being aromatic or having its elements bonded by a single bond only, and mixtures thereof; (b) applying a coating of said mixture on the surface of the substrate; (c) maintaining the coated substrate at a temperature above the melting point of the coating for a time sufficient to flow-out the coating to form a smooth coated surface, there being no radiation applied to the coated substrate; and (d) cooling the coated substrate to room temperature.
Claim 2
Independent Claim
223 words
A method for coating substrates with a stress-crack resistant fluoropolymer coating without irradiation, said method comprising: (a) preparing a homogeneous coating mixture comprised of a fluoropolymer and about 0.05 to 15 weight percent, based on the total weight of ingredients, of a polyfunctional monomer containing two or more allyl groups, wherein the fluoropolymer is selected from the group consisting of: (aa) a copolymer containing units derived from ethylene and a monomer selected from the group consisting of chlorotrifluoroethylene and tetrafluoroethylene or mixtures thereof, and (ab) a polymer comprised of from about 40 to 60 mol percent ethylene, about 60 to 40 mol percent chlorotrifluoroethylene and about 0.1 to 10 mol percent of a fluorinated termonomer selected from the group consisting of 3,3,3-trifluoro-2-trifluoromethyl propene, hexafluoroacetone, a vinyl monomer which is free of telogenic activity and which provides a side chain having at least two carbon atoms, the side chain being aromatic or having its elements bonded by a single bond only, and mixtures thereof; (b) applying a coating of said mixture on the surface of the substrate; (c) maintaining the coated substrate at a temperature above the melting point of the coating for a time sufficient to flow-out the coating to form a smooth coated surface, there being no radiation applied to the coated substrate; and (d) cooling the coated substrate to room temperature.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the copolymer is comprised of about 40 to 60 wt. % of ethylene and about 60 to 40 wt. % of chlorotrifluoroethylene.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the polyfunctional monomer is selected from the group consisting of triallylisocyanurate, triallylcyanurate, triallylpyromellitate, and triallylfumarate.
Claim 5
Dependent Claim
13 words
The method of claim 2 wherein the polyfunctional monomer is triallylisocyanurate or triallylcyanurate.
Claim 6
Dependent Claim
30 words
The method of claim 1 wherein up to about 10 wt. %, based on the total weight of the coating, of a heat stabilizer is incorporated into the coating mixture.
Claim 7
Dependent Claim
61 words
The method of claim 5 wherein the heat stabilizer is a di- or trivalent oxide or a complex thereof wherein the standard free energy change in going from the oxide to the corresponding metal chloride is equal to or less than about 11 Kcal/mol for the divalent metals, and equal to or less than about 16 Kcal/mol for the trivalent metals.
Claim 8
Dependent Claim
36 words
The method of claim 6 wherein the oxide compound is selected from the group consisting of lead oxide, calcium oxide, magnesium oxide, barium oxide, manganese oxide, cadmium oxide, strontium oxide, tin oxide and tribasic lead sulfate.
Claim 9
Dependent Claim
13 words
The method of claim 7 wherein the polyfunctional monomer is triallylisocyanurate or triallylcyanurate.
Claim 10
Dependent Claim
27 words
The method of claim 1 wherein the substrate, prior to the application of the coating mixture, is preheated to a temperature of about 250° to 360° C.
Claim 11
Dependent Claim
27 words
The method of claim 8 wherein the substrate, prior to the application of the coating mixture, is preheated to a temperature of about 250° to 360° C.
Claim 12
Dependent Claim
17 words
The method of claim 1 wherein the coating mixture is applied to the substrate in powder form.
Claim 13
Dependent Claim
21 words
The method of claim 1 wherein the coating mixture is applied to the substrate as an emulsion in a water matrix.
Claim 14
Dependent Claim
25 words
The method of claim 1 wherein the substrate is a metal selected from the group consisting of iron, steel, stainless steel, aluminum, zinc and copper.
Claim 15
Dependent Claim
28 words
The method of claim 1 wherein the copolymer is comprised of about 40 to 60 wt. % of ethylene and about 60 to 40 wt. % of tetrafluoroethylene.
Claim 16
Dependent Claim
11 words
The method of claim 2 wherein the polyfunctional monomer is triallylisocyanurate.
Claim 17
Dependent Claim
11 words
The method of claim 14 wherein the polyfunctional monomer is triallylisocyanurate.
Claim 18
Dependent Claim
11 words
The method of claim 2 wherein the polyfunctional monomer is triallylcyanurate.
Claim 19
Dependent Claim
11 words
The method of claim 14 wherein the polyfunctional monomer is triallylcyanurate.
Claim 20
Dependent Claim
35 words
The method of claim 5 wherein the copolymer is comprised of about 40 to 60 wt. % ethylene and about 60 to 40 wt. % of chlorotrifluoroethylene and the polyfunctional monomer is triallylisocyanurate or triallylcyanurate.
Claim 21
Dependent Claim
36 words
The method of claim 19 wherein the heat stabilizer is selected from the group consisting of lead oxide, calcium oxide, magnesium oxide, barium oxide, manganese oxide, cadmium oxide, strontium oxide, tin oxide and tribasic lead sulfate.
Claim 22
Dependent Claim
13 words
The method of claim 19 wherein the heat stabilizer is tribasic lead sulfate.
Claim 23
Dependent Claim
17 words
The method of claim 1 wherein the copolymer is an approximately equimolar copolymer of ethylene and chlorotrifluoroethylene.
Claim 24
Dependent Claim
19 words
The method of claim 1 wherein the polymer comprises from about 0.5 to 5 mol percent of 3,3,3-trifluoro-2-trifluoromethyl propene.
Claim 25
Dependent Claim
26 words
The method of claim 1 wherein the coated substrate is maintained at a temperature of about 250° to 360° C. for about 5 to 60 minutes.
Claim 26
Dependent Claim
26 words
The method of claim 1 wherein the coated substrate is maintained at a temperature of about 255° to 300° C. for about 5 to 60 minutes.
Claim 27
Dependent Claim
26 words
The method of claim 1 wherein the coated substrate is maintained at a temperature of about 255° to 300° C. for about 10 to 40 minutes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |