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Patent US3940520A successfully refreshed from Google Patents.
US3940520A
Expired / Lapsed
US
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Sulfo-fluorination of synthetic resins
Assignee: Air Products and Chemicals Inc
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Filing: 1974-02-19
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Granted: 1976-02-24
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Expires: 1994-02-19
Abstract
Abstract This invention relates to a process for improving the water wicking and moisture transport properties of synthetic resins, e.g., fiber form polyamides, polyesters, polyolefins, and polyacrylonitriles, which comprises sulfofluorinating said resins in a self-activating gaseous reaction medium containing from about 0.1-20% by volume elemental fluorine, 0.1-50% by volume of sulfur dioxide, 0-21% by volume oxygen, and the balance inert for providing from 1 × 10 - 9 to 1 × 10 - 3 milligrams fluorine and sulfur per square centimeter of resin surface.
Inventors
- 👤 Dale D. Dixon
- 👤 Larry J. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:01
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/07; D06M11/09; D06M11/11; D06M11/32; D06M11/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
The process for improving the water transport or wicking properties of a synthetic polymer material which comprises sulfo-fluorinating the polymeric materials in a sealed reaction chamber by reacting said polymeric material with a self-activating gaseous medium comprising about 0.1 to about 20% by volume fluorine, 0.1 to about 50% by volume sulfur dioxide, not more than about 21% by volume oxygen, and the balance comprising inert gases for a time less than one hour and at a temperature for providing from 1 × 10 - 9 × 1 × 10 - 3 mg fluorine and sulfur per square centimeter of polymeric material surface.
Claim 2
Dependent Claim
103 words
The process for improving the water transport or wicking properties of a synthetic polymer material which comprises sulfo-fluorinating the polymeric materials in a sealed reaction chamber by reacting said polymeric material with a self-activating gaseous medium comprising about 0.1 to about 20% by volume fluorine, 0.1 to about 50% by volume sulfur dioxide, not more than about 21% by volume oxygen, and the balance comprising inert gases for a time less than one hour and at a temperature for providing from 1 × 10 - 9 × 1 × 10 - 3 mg fluorine and sulfur per square centimeter of polymeric material surface.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the treatment time is less than about 15 minutes.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the treating medium contains from 0.1-10% F 2 and 0.1-20% SO 2 .
Claim 5
Independent Claim
99 words
The method of treating fiber form synthetic resins selectd from the group consisting of polyamides, polyesters, polyolefins, and polyacrylonitriles for improving the water transport properties thereof, said method comprising sulfo-fluorinating said fibers by reacting said fibers with a self-activating gaseous reaction medium containing by volume from 0.1-10% fluorine, 0.1-20% sulfur dioxide, not more than about 5% oxygen, and the balance comprising inert gases for a time less than about 15 minutes and of a temperature providing from 1 × 10 - 9 to 1 × 10 - 3 mg of fluorine and sulfur per square centimeter of fiber surface.
Claim 6
Independent Claim
99 words
The method of treating fiber form synthetic resins selectd from the group consisting of polyamides, polyesters, polyolefins, and polyacrylonitriles for improving the water transport properties thereof, said method comprising sulfo-fluorinating said fibers by reacting said fibers with a self-activating gaseous reaction medium containing by volume from 0.1-10% fluorine, 0.1-20% sulfur dioxide, not more than about 5% oxygen, and the balance comprising inert gases for a time less than about 15 minutes and of a temperature providing from 1 × 10 - 9 to 1 × 10 - 3 mg of fluorine and sulfur per square centimeter of fiber surface.
Claim 7
Dependent Claim
31 words
The method of claim 4 wherein the fiber form synthetic resin is selected from the group consisting of polyamides and polyesters and the gaseous reaction medium is substantially free of oxygen.
References Cited (Backward Citations)
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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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |