US4374874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant coating composition containing hollow microballoons
Assignee: T C Manufacturing Co Inc
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Filing: 1981-06-08
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Granted: 1983-02-22
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Expires: 2001-06-08
Abstract
Abstract A fluoroelastomer-hollow glass microsphere coating has been found to provide new and unexpected corrosion resistance to metal surfaces for protection against severely corrosive environments. The coating comprises a fluorocarbon elastomer and 3-50% by volume of hollow glass microspheres or microballoons having a size in the range of about 2-300 microns, preferably 20-200 microns. The hollow glass microspheres or microballoons substantially increases the corrosion resistance of a fluoroelastomeric liquid composition, yielding new and unexpected thermal and chemical resistance, particularly when the coating composition is applied in two or more layers.
Inventors
- 👤 John Blitstein
- 👤 Donald Kathrein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:36
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; B; B05; B05D; B05D7/00; B05D7/14; C09; C09D; C09D5/00; C09D5/08; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A method of protecting a substrate from degradation caused by chemical or thermal attack comprising: coating said substrate with a layer of a fluoroelastomer composition comprising a fluoroelastomer dissolved in a solvent and a plurality of hollow microspheres dispersed in said dissolved fluorelastomer, said microspheres having a particle size in the range of about 2 to about 300 microns, said microspheres encapsulated in said fluoroelastomer composition in an amount of about 3 to about 50 percent by volume of fluoroelastomer plus microspheres; drying said layer of fluoroelastomer composition to form a first coating layer; and curing said first layer of fluoroelastomer composition.
Claim 2
Independent Claim
102 words
A method of protecting a substrate from degradation caused by chemical or thermal attack comprising: coating said substrate with a layer of a fluoroelastomer composition comprising a fluoroelastomer dissolved in a solvent and a plurality of hollow microspheres dispersed in said dissolved fluorelastomer, said microspheres having a particle size in the range of about 2 to about 300 microns, said microspheres encapsulated in said fluoroelastomer composition in an amount of about 3 to about 50 percent by volume of fluoroelastomer plus microspheres; drying said layer of fluoroelastomer composition to form a first coating layer; and curing said first layer of fluoroelastomer composition.
Claim 3
Dependent Claim
39 words
A method as defined in claim 1 further including applying a second layer of said fluoroelastomer composition over said dried first layer to nest additional fluoroelastomer-encapsulated microspheres within spaces formed between fluoroelastomer-encapsulated microspheres protruding from said first coating layer.
Claim 4
Dependent Claim
18 words
A method as defined in claim 1 wherein said fluoroelastomer comprises a copolymer of hexafluoropropylene and vinylidene fluoride.
Claim 5
Dependent Claim
18 words
A method as defined in claim 1 wherein said substrate comprises a metallic interior portion of a chimney.
Claim 6
Dependent Claim
20 words
A method as defined in claim 1 wherein said fluoroelastomer comprises a copolymer of two or more fluorinated olefinic polymers.
Claim 7
Dependent Claim
20 words
A method as defined in claim 1 wherein said microspheres have an average diameter of about 50 to 150 microns.
Claim 8
Dependent Claim
23 words
A method as defined in claim 2 wherein said first and second coatings are each applied in a dry thickness of 1-20 mils.
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) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |