US4778723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for sizing polytetrafluoroethylene fibers, yarn, or threads
Assignee: Dow Chemical Co
•
Filing: 1986-06-20
•
Granted: 1988-10-18
•
Expires: 2006-06-20
Abstract
Abstract The invention is a method for sizing polyterafluoroethylene fibers, yarns, or threads comprising: (a) contacting polytetrafluoroethylene fibers, yarns, or threads with 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° C.; a density of from about 1.55 to about 2.97 grams per cubic centimeter; and a solubility parameter of from greater than about 7.1 to about 8.2 hildebrands; and (b) removing the treating agent from the sizing composition, thereby depositing the perfluorinated polymer onto the surface of the polytetrafluoroethylene. Particularly preferred as a treating agent is a compound represented by the general formula: XCF.sub.2 --CYZX' wherein: X is selected from the group consisting of --F, --Cl, --Br, and --I; X' is selected from the group consisting of --Cl, --Br, and --I; Y and Z are independently selected from the group consisting of --H, --F, --Cl, --Br, --I and --R'; 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-di-bromotetrafluoroethane.
Inventors
- 👤 William P. Carl
- 👤 Jeffrey D. Birdwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:35
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/263; D06M15/277; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
93 words
A method for sizing polytetrafluoroethylene fibers, yarns, or threads comprising: (a) contacting polytetrafluoroethylene fibers, yarns, or threads with 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° C.; a density of from about 1.55 to about 2.97 grams per cubic centimeter; and a solubility parameter of from greater than about 7.1 to about 8.2 hildebrands; and (b) removing the treating agent from the sizing composition, thereby depositing the perfluorinated polymer onto the surface of the polytetrafluoroethylene.
Claim 2
Independent Claim
93 words
A method for sizing polytetrafluoroethylene fibers, yarns, or threads comprising: (a) contacting polytetrafluoroethylene fibers, yarns, or threads with 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° C.; a density of from about 1.55 to about 2.97 grams per cubic centimeter; and a solubility parameter of from greater than about 7.1 to about 8.2 hildebrands; and (b) removing the treating agent from the sizing composition, thereby depositing the perfluorinated polymer onto the surface of the polytetrafluoroethylene.
Claim 3
Dependent Claim
246 words
The method of claim 1 wherein the perfluorinated polymer is a copolymer of a first type of monomer and a second type of monomer: wherein the first type of monomer is represented by the general formula: CF.sub.2 ═CZZ' (I) where: Z and Z' are independently selected from the group consisting of --H, --Cl, --F, or CF 3 ; Y--(CF.sub.2).sub.a --(CFR.sub.f).sub.b --(CFR.sub.f').sub.c --O--[CF(CF.sub.2 X)--CF.sub.2 --O].sub.n --CF═CF.sub.2 (II) where: Y is selected from the group consisting of --SO 2 Z, --CN, --COZ, and C(R 3 f)(R 4 f)OH; Z is I, --Br, --Cl, --F, --OR or --NR 1 R 2 ; R is a branched or linear alkyl radical having from 1 to about 10 carbon atoms or an aryl radical; R 3 f and R 4 f are independently selected from the group consisting of perfluoroalkyl radicals having from 1 to about 10 carbon atoms; R 1 and R 2 are independently selected from the group consisting of --H, a branched or linear alkyl radical having from 1 to about 10 carbon atoms or an aryl radical; a is 0-6; b is 0-6; c is 0 or 1; provided a+b+c is not equal to 0; X is --Cl, --Br, --F or mixtures thereof when n>1; n is 0 to 6; and R f and R f' are independently selected from the group consisting of --F, --Cl, perfluoroalkyl radicals having from 1 to about 10 carbon atoms and fluorochloroalkyl radicals having from 1 to about 10 carbon atoms.
Claim 4
Dependent Claim
120 words
The method of claim 2 wherein the perfluorinated polymer is a copolymer formed from three types of monomers wherein the third type of monomer is one or more monomers represented by the general formula: Y'--(CF.sub.2).sub.a' --(CFR.sub.f).sub.b' --(CFR'.sub.f).sub.c' --O--[CF(CF.sub.2 X')--CF.sub.2 --O].sub.n' --CF═CF.sub.2 (III) where: Y' is --F, --Cl or --Br; a' and b' are independently 0-3; c' is 0 or 1; provided a'+b'+c' is not equal to 0; n' is 0-6; R f and R' f are independently selected from the group consisting of --Br, --Cl, --F, perfluoroalkyl radicals having from about 1 to about 10 carbon atoms, and chloroperfluoroalkyl radicals having from about 1 to about 10 carbon atoms; and X' is --F, --Cl, --Br, or mixtures thereof when n'>1.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the boiling point of the treating agent is from about 30° C. to about 110° C.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the density of the treating agent is from about 1.55 to about 2.97 grams per cubic centimeter.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein the solubility parameter of the treating agent is from greater than about 7.1 to about 8.2 hildebrands.
Claim 8
Dependent Claim
30 words
The method of claim 1 wherein the density of the treating agent and the density of the polymer are both from about 1.55 to about 2.2 grams per cubic centimeter.
Claim 9
Independent Claim
131 words
A method for sizing polytetrafluoroethylene fibers, yarns, or threads comprising: (a) contacting polytetrafluoroethylene fabrics or threads with a sizing composition having a perfluorinated polymer containing sites convertible to ion exchange groups and a treating agent, wherein the treating agent is represented by the general formula: XCF.sub.2 --CYZX' wherein: X is selected from the group consisting of --F, --Cl, --Br, and --I; X' is selected from the group consisting of --Cl, --Br, and --I; Y and Z are independently selected from the group consisting of --H, --F, --Cl, --Br, --I and --R'; R' is selected from the group of perfluoroalkyl radicals and chloroperfluoroalkyl radicals having from 1 to 6 carbon atoms; and (b) removing the treating agent from the sizing composition, thereby depositing the perfluorinated polymer onto the surface of the polytetrafluoroethylene.
Claim 10
Independent Claim
131 words
A method for sizing polytetrafluoroethylene fibers, yarns, or threads comprising: (a) contacting polytetrafluoroethylene fabrics or threads with a sizing composition having a perfluorinated polymer containing sites convertible to ion exchange groups and a treating agent, wherein the treating agent is represented by the general formula: XCF.sub.2 --CYZX' wherein: X is selected from the group consisting of --F, --Cl, --Br, and --I; X' is selected from the group consisting of --Cl, --Br, and --I; Y and Z are independently selected from the group consisting of --H, --F, --Cl, --Br, --I and --R'; R' is selected from the group of perfluoroalkyl radicals and chloroperfluoroalkyl radicals having from 1 to 6 carbon atoms; and (b) removing the treating agent from the sizing composition, thereby depositing the perfluorinated polymer onto the surface of the polytetrafluoroethylene.
Claim 11
Dependent Claim
11 words
The method of claim 8 wherein X and X' are --Br.
Claim 12
Dependent Claim
11 words
The method of claim 8 wherein X and X' are --Cl.
Claim 13
Dependent Claim
26 words
The method of claim 8 wherein the polymer is present in the sizing composition at a concentration of from about 0.1 to about 50 weight percent.
Claim 14
Dependent Claim
26 words
The method of claim 8 wherein the polymer is present in the sizing composition at a concentration of from about 0.3 to about 30 weight percent.
Claim 15
Dependent Claim
259 words
The method of claim 8 wherein the perfluorinated polymer is a copolymer of a first type of monomer and a second type of monomer: wherein the first type of monomer is represented by the general formula: CF.sub.2 ═CZZ' (I) where: Z and Z' are independently selected from the group consisting of --H, --Cl, --F, or --CF 3 ; the second type of monomer is a compound represented by the general formula: Y--(CF.sub.2).sub.a --(CFR.sub.f).sub.b --(CFR.sub.f').sub.c --O[CF(CF.sub.2 X)--CF.sub.2 --O].sub.n --CF═CF.sub.2 (II) where: Y is selected from the group consisting of --SO 2 Z, --CN, --COZ, and C(R 3 f)(R 4 f)OH; Z is I, --Br, --Cl, --F, --OR or --NR 1 R 2 ; R is a branched or linear alkyl radical having from 1 to about 10 carbon atoms or an aryl radical; R 3 f and R 4 f are independently selected from the group consisting of perfluoroalkyl radicals having from 1 to about 10 carbon atoms; R 1 and R 2 are independently selected from the group consisting of --H, a branched or linear alkyl radical having from 1 to about 10 carbon atoms or an aryl radical; a is 0-6; b is 0-6; c is 0 or 1; provided a+b+c is not equal to 0; X is --Cl, --Br, --F or mixtures thereof when n>1; n is 0 to 6; and R f and R f' are independently selected from the group consisting of --F, --Cl, perfluoroalkyl radicals having from 1 to about 10 carbon atoms and fluorochloroalkyl radicals having from 1 to about 10 carbon atoms.
Claim 16
Dependent Claim
120 words
The method of claim 8 wherein the perfluorinated polymer is a copolymer formed from three types of monomers wherein the third type of monomer is one or more monomers represented by the general formula: Y'--(CF.sub.2).sub.a' --(CFR.sub.f).sub.b' --(CFR'.sub.f).sub.c' --O--[CF(CF.sub.2 X')--CF.sub.2 --O].sub.n' --CF═CF.sub.2 (III) where: Y' is --F, --Cl or --Br; a' and b' are independently 0-3; c' is 0 or 1; provided a'+b'+c' is not equal to 0; n' is 0-6; R f and R' f are independently selected from the group consisting of --Br, --Cl, --F, perfluoroalkyl radicals having from about 1 to about 10 carbon atoms, and chloroperfluoroalkyl radicals having from about 1 to about 10 carbon atoms; and X' is --F, --Cl, --Br, or mixtures thereof when n'>1.
Claim 17
Dependent Claim
36 words
The method of claim 8 where Y is --SO 2 F or --COOCH 3 ; n is 0 or 1; R f and R f' are F; X is --Cl or --F; and a+b+c=2 or 3.
Claim 18
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 1.
Claim 19
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 2.
Claim 20
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 3.
Claim 21
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 4.
Claim 22
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 5.
Claim 23
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 6.
Claim 24
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 7.
Claim 25
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 8.
Claim 26
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 9.
Claim 27
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 10.
Claim 28
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 11.
Claim 29
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 12.
Claim 30
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 13.
Claim 31
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 14.
Claim 32
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 15.
Claim 33
Dependent Claim
13 words
The coated fiber, yarn, or thread produced from the method of claim 16.
References Cited (Backward Citations)
US3282875A
Cited
US3692569A
Cited
US4025405A
Cited
US4192725A
Cited
US3770567A
Cited
US3925135A
Cited
US4357218A
Cited
US4178218A
Cited
US3909378A
Cited
US4065366A
Cited
US4065366B1
Cited
US4126588A
Cited
US4123336A
Cited
US4116888A
Cited
US4147844A
Cited
US4151052A
Cited
US4212713A
Cited
US4251333A
Cited
US4259226A
Cited
US4176215A
Cited
US4270996A
Cited
GB2051091A
Cited
US4209635A
Cited
US4329435A
Cited
GB2060703A
Cited
US4340680A
Cited
EP0027009A1
Cited
GB2066824A
Cited
US4348310A
Cited
US4298697A
Cited
US4272560A
Cited
GB2064586A
Cited
US4399183A
Cited
US4324606A
Cited
GB2069006A
Cited
US4470889A
Cited
US4330654A
Cited
US4358412A
Cited
US4358545A
Cited
US4478695A
Cited
US4462877A
Cited
US4337137A
Cited
US4417969A
Cited
US4337211A
Cited
US4360601A
Cited
US4341605A
Cited
EP0066369A1
Cited
US4433082A
Cited
US4469579A
Cited
US4421579A
Cited
US4421576A
Cited
US4545886A
Cited
US4437951A
Cited
US4437952A
Cited
EP0122048A2
Cited
US4610762A
Cited
US4650551A
Cited
US4650711A
Cited
US4654104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |