Method for sizing polytetrafluoroethylene fabrics
US4650711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1985 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | May 31, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2402
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention is a method for sizing polytetrafluoroethylene fabrics comprising: PA0 (a) forming a sizing composition of a perfluorinated polymer containing sites convertible to ion exchange groups and a treating agent having: a boiling point less than about 110.degree. C.; a density of from about 1.55 to about 2.2; and a solubility parameter of from greater than about 7.1 to about 8.2 hildebrands; PA0 (b) contacting the sizing composition with the fibers of a polytetrafluoroethylene fabric; and PA0 (c) removing the treating agent from the sizing composition. Particularly preferred as a treating agent is a compound represented by the general formula: EQU XCF.sub.2 --CYZX' wherein: PA0 X is selected from the group consisting of F, Cl, Br, and I; PA0 X' is selected from the group consisting of Cl, Br, and I; PA0 Y and Z are independently selected from the group consisting of H, F, Cl, Br, I and R'; PA0 R' is selected from the group of perfluoroalkyl radicals and chloroperfluoroalkyl radicals having from 1 to 6 carbon atoms. The most preferred treating agent is 1,2-dibromotetrafluoroethane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.