Patent US4278703A successfully refreshed from Google Patents.
US4278703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for producing fluorocarbon finishes on fibrous structures
Assignee: Science Applications Inc
•
Filing: 1979-08-20
•
Granted: 1981-07-14
•
Expires: 1999-08-20
Abstract
Abstract An improved process and apparatus is provided for imparting chemically bonded fluorocarbon finishes to textiles. In the process, the textiles are contacted with a gaseous mixture of fluoroolefins in an inert diluent gas in the presence of ultraviolet light under predetermined conditions.
Inventors
- 👤 Madeline S. Toy
- 👤 Roger S. Stringham
- 👤 Lawrence C. Fogg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:04
CPC Classifications
D; D06; D06M; D06M14/00; D06M14/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
205 words
A method for imparting an improved finish to a fibrous textile material or the like while retaining the identity of the material, comprising contacting a web of said material with a gaseous medium containing from about 5% to about 10% of a fluoroolefin gas comprising bromotrifluoroethylene as its major component and from about 90% to about 95% of an inert diluent gas, and while so contacted, subjecting said web to ultraviolet radiation under controlled conditions by moving the latter from a supply roll thereof along a cylindrical path toward a takeup roll therefor, said cylindrical path being spaced about 40 mm from an elongated ultraviolet lamp located substantially at the axis of said path and having an output of about 200 watts per inch of length, and maintaining the temperature of said web within the range of about ambient to about 200° C., said web movement being such as to expose said web to ultraviolet radiation from said lamp for from about 200 to about 500 seconds during traversal of said cylindrical path by said web, thereby to cause photografting and chemical bonding between the fluoroolefin in said gaseous medium and the fibers of said material effective to impart said improved finish to said material.
Claim 2
Independent Claim
205 words
A method for imparting an improved finish to a fibrous textile material or the like while retaining the identity of the material, comprising contacting a web of said material with a gaseous medium containing from about 5% to about 10% of a fluoroolefin gas comprising bromotrifluoroethylene as its major component and from about 90% to about 95% of an inert diluent gas, and while so contacted, subjecting said web to ultraviolet radiation under controlled conditions by moving the latter from a supply roll thereof along a cylindrical path toward a takeup roll therefor, said cylindrical path being spaced about 40 mm from an elongated ultraviolet lamp located substantially at the axis of said path and having an output of about 200 watts per inch of length, and maintaining the temperature of said web within the range of about ambient to about 200° C., said web movement being such as to expose said web to ultraviolet radiation from said lamp for from about 200 to about 500 seconds during traversal of said cylindrical path by said web, thereby to cause photografting and chemical bonding between the fluoroolefin in said gaseous medium and the fibers of said material effective to impart said improved finish to said material.
Claim 3
Dependent Claim
38 words
The method of claim 1 wherein said cylindrical path is defined by the outer surface of a cylindrical ultraviolet transmissive sleeve coaxially surrounding said lamp and overlaid by said web around a major portion of the circumference thereof.
Claim 4
Dependent Claim
57 words
The method of claim 1 wherein the temperature of said web is maintained within said range by passing the light from said lamp through an ultraviolet transmissive jacket in spaced surrounding relation with respect to said lamp and containing trichlorotrifluoroethane to remove the infrared portions from said light prior to contact of the latter with said web.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein during irradiation of said web, the exterior of said lamp is flushed with nitrogen gas which is prevented from contacting said web.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the temperature of said web is maintained between about 150° C. and 200° C.
Claim 7
Dependent Claim
27 words
The method of claim 1 wherein said inert diluent gas is nitrogen and said fluoroolefin gas ranges from neat bromotrifluoroethylene to equal amounts of bromotrifluoroethylene and tetrafluoroethylene.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein said gaseous medium comprises about 1% tetrafluoroethylene, about 4% bromotrifluoroethylene and about 95% nitrogen.
Claim 9
Dependent Claim
26 words
The method of claim 1 wherein said textile material comprises fibres formed of one or more of the group consisting of cotton, wool, polyester and polyamide.
References Cited (Backward Citations)
US1672331A
Cited
US2020296A
Cited
US3686022A
Cited
US3596125A
Cited
US3665269A
Cited
US3679461A
Cited
US3935359A
Cited
US4107391A
Cited
US4100418A
Cited
US4169904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |