Hydrophobic membrane materials for filter venting applications
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-065/00
출원번호
US-0753931
(2004-01-08)
발명자
/ 주소
Wang, I-fan
McDonogh, Richard
Rudolph, Jr., James E.
출원인 / 주소
Pall Corporation
대리인 / 주소
Knobbe Martens Olson &
인용정보
피인용 횟수 :
74인용 특허 :
34
초록▼
The present invention relates to filtration media having both hydrophobic (water-repellent) properties. The filtration media are produced using a fluorothermoplastic material, such as a terpolymer of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene. The invention also relates to met
The present invention relates to filtration media having both hydrophobic (water-repellent) properties. The filtration media are produced using a fluorothermoplastic material, such as a terpolymer of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene. The invention also relates to methods of preparing such filtration media using casting solution phase inversion.
대표청구항▼
1. A method for preparing a membrane, the method comprising:providing a casting dope comprising a solvent and a terpolymer of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene; casting the dope to form a thin film; exposing the film to a humid atmosphere for a period of time sufficie
1. A method for preparing a membrane, the method comprising:providing a casting dope comprising a solvent and a terpolymer of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene; casting the dope to form a thin film; exposing the film to a humid atmosphere for a period of time sufficient to allow formation of surface pores; quenching the film in a quenching bath; and recovering from the quenching bath a flat sheet membrane, the membrane comprising a terpolymer of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene, the membrane having a first porous face having a first average pore diameter, a second porous face having a second average pore diameter, and a porous supporting structure therebetween wherein the supporting structure comprises a reticulated network of flow channels, and wherein the porous faces and the porous supporting structure comprise a network of structural surfaces capable of contacting a filter stream. 2. The method of claim 1, further comprising:rinsing the membrane in a rinsing bath, wherein the rinsing step is conducted after the quenching step. 3. The method of claim 2, further comprising:drying the membrane at an elevated temperature. 4. The method of claim 2, further comprising:drying the membrane at room temperature. 5. The method of claim 1, wherein the dope comprises a homogeneous solution.6. The method of claim 1, wherein the dope comprises a dispersion.7. The method of claim 1, wherein the dope further comprises a nonsolvent.8. The method of claim 7, wherein the nonsolvent comprises water.9. The method of claim 7, wherein the dope comprises from about 1 wt. % to about 50 wt. % of nonsolvent.10. The method of claim 1, wherein the solvent is selected from the group consisting of ketones, esters, ethers, and mixtures thereof.11. The method of claim 1, wherein the solvent comprises n-butanol.12. The method of claim 1, wherein the solvent comprises acetone.13. The method of claim 1, wherein the solvent comprises dimethylformamide.14. The method of claim 1, wherein the solvent comprises a first solvent having a first vapor pressure and a second solvent having a second vapor pressure, and wherein the first vapor pressure and the second vapor pressure are different.15. The method of claim 1, wherein the dope comprises from about 15 wt. % to about 95 wt. % of solvent.16. The method of claim 1, wherein the dope comprises from about 5 wt. % to about 30 wt. % of the terpolymer.17. The method of claim 1, wherein the quenching bath comprises water.18. The method of claim 2, wherein the rinsing bath comprises water.
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이 특허에 인용된 특허 (34)
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