Patent US4232087A successfully refreshed from Google Patents.
US4232087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating organic fibers with polytetrafluoroethylene
Assignee: Tex-Tech Industries Inc
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Filing: 1978-08-03
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Granted: 1980-11-04
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Expires: 1998-08-03
Abstract
Abstract The disclosure is of a method for improving the acid resistance, hydrophobicity, oleophobicity and dust or dirt release properties of synthetic organic fibers. The method comprises coating the fibers with an aqueous dispersion of polytetrafluoroethylene particles in the presence of a water soluble, chromium complex of a long chain fluorochemical. The method is particularly advantageous for improving polyaramid fibers such as Nomex fibers in fabrics to be used as a filter means.
Inventors
- 👤 Elwood G. Trask
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:12
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/244; D06M15/256; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T442/00; Y10T442/20; Y10T442/2164; Y10T442/2172; Y10T442/2279; Y10T442/2287; Y10T442/2549; Y10T442/2574
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A method of improving the acid resistance, hydrophobicity, oleophobicity and soil release properties of synthetic, organic fibers, which comprises; coating the fibers with polytetrafluoroethylene particles, in the presence of water and a water soluble, chromium complex of a long chain fluorochemical characterized in part by a molecular structure which consists of a polar end and a non-polar fluorocarbon end which is both organophobic and hydrophobic.
Claim 2
Independent Claim
65 words
A method of improving the acid resistance, hydrophobicity, oleophobicity and soil release properties of synthetic, organic fibers, which comprises; coating the fibers with polytetrafluoroethylene particles, in the presence of water and a water soluble, chromium complex of a long chain fluorochemical characterized in part by a molecular structure which consists of a polar end and a non-polar fluorocarbon end which is both organophobic and hydrophobic.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said chromium complex is the chromium (Cr III) complex of N-ethyl-N-heptadecylfluorooctane sulfonyl glycine.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said particles have an average diameter of from 0.05 to 0.5 microns.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the coating adds from 2 to 10 percent by weight to the fibers.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the organic fibers are polyaramid fibers.
Claim 7
Independent Claim
72 words
A method of improving the acid resistance, hydrophobocity, oleophobicity and soil release properties of polyaramid fibers, which comprises; coating the fibers with polytetrafluoroethylene particles, in the presence of water and the chromium (Cr III) complex of N-ethyl-N-heptadecylfluoroctane sulfonyl glycine so as to add on from about 2 to about 10 percent by weight of said particles and from about 0.3 to 1.5 percent by weight of said complex to the fibers weight.
Claim 8
Independent Claim
72 words
A method of improving the acid resistance, hydrophobocity, oleophobicity and soil release properties of polyaramid fibers, which comprises; coating the fibers with polytetrafluoroethylene particles, in the presence of water and the chromium (Cr III) complex of N-ethyl-N-heptadecylfluoroctane sulfonyl glycine so as to add on from about 2 to about 10 percent by weight of said particles and from about 0.3 to 1.5 percent by weight of said complex to the fibers weight.
Claim 9
Dependent Claim
19 words
The method of claim 6 wherein 0.7 percent of the final fabric weight is added on by the complex.
Claim 10
Dependent Claim
8 words
The product of the method of claim 6.
Claim 11
Dependent Claim
13 words
The method of claim 1 wherein said fibers are in a non-woven fabric.
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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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |