US3864322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorocarbon copolymer powders and preparation by spray drying
Assignee: EIDP Inc
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Filing: 1973-04-12
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Granted: 1975-02-04
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Expires: 1993-04-12
Abstract
Abstract The perfluorocarbon polymer powder coating composition consists essentially of spherical particles about 1 to 75 microns in diameter of an agglomerate of submicron particles of the perfluorocarbon polymer; the perfluorocarbon polymer preferably is a copolymer of tetrafluoroethylene and hexafluoropropylene, and the powder particles contain about 0.5 - 15 percent by weight of a nonionic surfactant such as isooctylphenoxypolyethoxy ethanol the powder is prepared by a spray drying process; this powder composition is particularly useful for electrostatic deposition on all types of metal substrates to form a durable, tough, chemical-resistant release coating that can be applied to thicknesses of 30 mils and above; the powder coating composition is particularly useful for chemical vessels, appliances, industrial equipment, high temperature ovens and the like; a process for preparing the perfluorocarbon polymer coating composition is also disclosed.
Inventors
- 👤 Michael D Yallourakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:04
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; B; B05; B05D; B05D5/00; B05D5/08; B05D5/083; C08; C08K; C08K5/00; C08K5/0008; B05D1/00; B05D1/02; B05D1/04; B05D1/06; B05D2202/00; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D7/546; B05D7/56; B05D7/58; B05D7/586; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A PERFLUOROCARBON POLYMER COATING COMPOSITION CONSISTING ESSENTIALLY OF SPHERICAL POWDER PARTICLES OF ABOUT 1 TO 75 MICRONS IN DIAMETER OF AN AGGLOMERATE OF SUBMICRON PARTICLES OF THE PERFLUOROCARBON POLYMER WHEREIN THE PERFLUOROCARBON POLYMER IS A COPOLYMER OF TETRAFLUOROETHYLENE AND ANOTHER COPOLYMERIZABLE FLUORINATED MONOMER AND THE POWDER CONTAINS ABOUT 0.5-15 PER CENT BY WEIGHT OF A NONIONIC SURFACTANT.
Claim 2
Dependent Claim
57 words
A PERFLUOROCARBON POLYMER COATING COMPOSITION CONSISTING ESSENTIALLY OF SPHERICAL POWDER PARTICLES OF ABOUT 1 TO 75 MICRONS IN DIAMETER OF AN AGGLOMERATE OF SUBMICRON PARTICLES OF THE PERFLUOROCARBON POLYMER WHEREIN THE PERFLUOROCARBON POLYMER IS A COPOLYMER OF TETRAFLUOROETHYLENE AND ANOTHER COPOLYMERIZABLE FLUORINATED MONOMER AND THE POWDER CONTAINS ABOUT 0.5-15 PER CENT BY WEIGHT OF A NONIONIC SURFACTANT.
Claim 3
Dependent Claim
33 words
The powder coating composition of claim 1 in which the perfluorocarbon polymer is selected from the group consisting of a copolymer of tetrafluoroethylene and hexafluoropropylene and a copolymer of tetrafluoroethylene and perfluoropropylvinyl ether.
Claim 4
Dependent Claim
29 words
The power coating composition of claim 2 in which the perfluorocarbon polymer is a copolymer of tetrafluoroethylene and hexafluoropropylene in a weight ratio of about 95/5 to about 50/50.
Claim 5
Dependent Claim
29 words
The powder coating composition of claim 2 in which the perfluorocarbon polymer is a copolymer of tetrafluoroethylene and hexafluoropropylene in a weight ratio of about 92/8 to about 80/20.
Claim 6
Dependent Claim
15 words
The powder coating composition of claim 4 in which the nonionic surfactant is an alkylaryloxypolyalkyloxyalkanol.
Claim 7
Dependent Claim
15 words
The powder coating composition of claim 5 in which the nonionic surfactant is isooctylphenoxypolyethoxy ethanol.
Claim 8
Dependent Claim
59 words
The powder coating composition of claim 1 in which the spherical powder particles have a diameter of about 5 to 40 microns and the perfluorocarbon polymer is a copolymer of tetrafluoroethylene and hexafluoropropylene in a weight ratio of about 92/8 to about 80/20 and contains about 1 - 10 percent by weight of a nonionic surfactant of isooctylphenoxypolyethoxy ethanol.
Claim 9
Dependent Claim
137 words
A process for preparing a perfluorocarbon polymer powder coating composition of claim 1 which comprises: a. spraying an aqueous dispersion of 10-70 percent polymer solids of a perfluorocarbon polymer of tetrafluoroethylene and another copolymerizable fluorinated monomer dispersed with about 2-10 per cent by weight of a nonionic surfactant and wherein the dispersed polymer particles have a size of about 0.1-0.5 microns into a chamber having a concurrent spiral air flow in which the air entering the chamber is at a temperature of about 200*-255*C. and the air leaving the chamber is at an outlet temperature of about 95*-125*C.; whereby the water is evaporated from the dispersion resulting in the formation of spherical powder particles about 1 to 75 microns in diameter which are an agglomeration of submicron perfluorocarbon particles; b. removing the powder particles from the chamber.
Claim 10
Dependent Claim
44 words
The process of claim 8 in which the aqueous dispersion has a 50 to 65 percent polymer solids content of a perfluorocarbon polymer of tetrafluoroethylene and hexafluoropropylene in a weight ratio of 92/8 to 80/20 and in which the nonionic surfactant iS an alkylaryloxypolyalkyloxyalkanol.
Claim 11
Dependent Claim
13 words
The process of claim 9 in which the nonionic surfactant is isooctylphenoxypolyethoxy ethanol.
References Cited (Backward Citations)
US2782174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |