IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0983949
(2004-11-08)
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| 등록번호 |
US-7381765
(2008-06-03)
|
|
발명자
/ 주소 |
|
| 출원인 / 주소 |
- Freudenberg NOK General Partnership
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| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
3 인용 특허 :
66 |
초록
▼
A composition of fluoropolymer and dispersed conductive particulate provides an electrically conductive polymeric material resistant to static charge buildup. Radiation curing, especially electron beam radiation curing, is favored for curing fluoroelastomer-based precursor articles into desired elec
A composition of fluoropolymer and dispersed conductive particulate provides an electrically conductive polymeric material resistant to static charge buildup. Radiation curing, especially electron beam radiation curing, is favored for curing fluoroelastomer-based precursor articles into desired electrically conductive articles.
대표청구항
▼
What is claimed is: 1. A composition comprising: (a) a continuous polymeric phase of fluoropolymer selected from the group consisting of (1) fluoroelastomer vulcanized to provide a compressive set value from about 5 to about 100 percent of a mathematical difference between a non-vulcanized compress
What is claimed is: 1. A composition comprising: (a) a continuous polymeric phase of fluoropolymer selected from the group consisting of (1) fluoroelastomer vulcanized to provide a compressive set value from about 5 to about 100 percent of a mathematical difference between a non-vulcanized compressive set value for said fluoroelastomer and a fully-vulcanized compressive set value for said fluoroelastomer; (2) fluoroelastomer thermoplastic vulcanizate vulcanized to provide a compressive set value from about 5 to about 100 percent of a mathematical difference between a non-vulcanized compressive set value for said fluoroelastomer of said fluoroelastomer thermoplastic vulcanizate and a fully-vulcanized compressive set value for said fluoroelastomer of said fluoroelastomer thermoplastic vulcanizate; (3) fluoroelastomer-based thermoplastic elastomer vulcanized to provide a compressive set value from about 5 to about 100 percent of a mathematical difference between a non-vulcanized compressive set value for said thermoplastic elastomer and a fully-vulcanized compressive set value for said thermoplastic elastomer, and (4) a blend of fluoroelastomer precursor gum and thermoplastic wherein said precursor gum has a glass transition temperature, a decomposition temperature, a Mooney viscosity of from about 0 to about 150 ML1+10 at 121 degrees Celsius, and, at a temperature having a value that is not less than said glass transition temperature and not greater than said decomposition temperature, a compressive set value from about 0 to about 5 percent of a mathematical difference between a non-vulcanized compressive set value for fluoroelastomer derived from said fluoroelastomer precursor gum and a fully-vulcanized compressive set value for said derived fluoroelastomer; and (b) a dispersed phase of conductive particulate, said dispersed phase comprising a plurality of conductive particles dispersed in said continuous polymeric phase, so that said composition provides an electrically conductive polymeric material having a post-cured electrical resistivity of less than or about 1��10-3 Ohm-m at 20 degress Celsius. 2. The composition of claim 1 wherein said fluororelastomer is selected from the group consisting of (i) vinylidene fluoride/hexafluoropropylene copolymer fluoroelastomer having from about 66 weight percent to about 69 weight percent fluorine and a Mooney viscosity of from about 0 to about 130 ML1+10 at 121 degrees Celsius, (ii) vinylidene fluoride/perfluorovinyl ether/tetrafluoroethylene terpolymer fluoroelastomer having at least one cure site monomer and from about 64 weight percent to about 67 weight percent fluorine and a Mooney viscosity of from about 50 to about 100 ML1+10 at 121 degrees Celsius, (iii) tetrafluoroethylene/propylene/vinylidene fluoride terpolymer fluoroelastomer having from about 59 weight percent to about 63 weight percent fluorine and a Mooney viscosity of from about 25 to about 45 ML1+10 at 121 degrees Celsius, (iv) tetrafluoroethylene/ethylene/perfluorovinyl ether terpolymer fluoroelastomer having at least one cure site monomer and from about 60 weight percent to about 65 weight percent fluorine and a Mooney viscosity of from about 40 to about 80 ML1+10 weight at 121 degrees Celsius, (v) vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene terpolymer fluoroelastomer having at least one cure site monomer and from about 66 weight percent to about 72.5 weight percent fluorine and a Mooney viscosity of from about 15 to about 90 ML1+10 at 121 degrees Celsius, (vi) tetrafluoroethylene/propylene copolymer fluoroelastomer having about 57 weight percent fluorine and a Mooney viscosity of from about 25 to about 115 ML1+10 at 121 degrees Celsius, (vii) tetrafluoroethylene/ethylene/perfluorovinyl ether/vinylidene fluoride tetrapolymer fluoroelastomer having at least one cure site monomer and from about 59 weight percent to about 64 weight percent fluorine and a Mooney viscosity of from about 30 to about 70 ML1+10 at 121 degrees Celsius, (viii) tetrafluoroethylene/perfluorovinyl ether copolymer fluoroelastomer having at least one cure site monomer and from about 69 weight percent to about 71 weight percent fluorine and a Mooney viscosity of from about 60 to about 120 ML1+10 at 121 degrees Celsius, (ix) fluoroelastomer corresponding to the formula description="In-line Formulae" end="lead"[-TFEq-HFPr-VdFs-]d description="In-line Formulae" end="tail" wherein TFE is essentially a tetrafluoroethyl block, HFP is essentially a hexafluoropropyl block, and VdF is essentially a vinylidyl fluoride block, and products qd and rd and sd collectively provide proportions of TFE, HFP, and VdF whose values are within element 101 of FIG. 1, and (x) combinations thereof. 3. The composition of claim 1 wherein said wherein said conductive particulate is selected from the group consisting of conductive carbon black, conductive carbon fiber, conductive carbon nanotubes, conductive graphite powder, conductive graphite fiber, bronze powder, bronze fiber, steel powder, steel fiber, iron powder, iron fiber, copper powder, copper fiber, silver powder, silver fiber, aluminum powder, aluminum fiber, nickel powder, nickel fiber, wolfram powder, wolfram fiber, gold powder, gold fiber, copper-manganese alloy powder, copper-manganese fiber, and combinations thereof. 4. The composition of claim 1 further comprising filler selected from the group consisting of fiberglass particulate, inorganic fiber particulate, carbon fiber particulate, ground rubber particulate, polytetrafluorinated ethylene particulate, microspheres, and carbon nanotubes. 5. The composition of claim 1 wherein said conductive particles are coated with a coating to provide coated conductive particles as said conductive particulate, said conductive particles having a first surface tension between said conductive particles and said fluoropolymer, said coated conductive particles having a second surface tension between said coated conductive particles and said fluoropolymer, said second surface tension less than said first surface tension. 6. The composition of claim 1 wherein said conductive particles consist essentially of conductive particles that independently have a cross-sectional diameter from about 0.1 microns to about 100 microns. 7. The composition of claim 1 wherein said fluoropolymer comprises from about 20 weight percent to about 90 weight percent of said composition.
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