US3754375A
Expired / Lapsed
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Anisotropic organosilicon polymer membrane
Assignee: Rhone Poulenc SA
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Filing: 1971-03-02
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Granted: 1973-08-28
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Expires: 1991-03-02
Abstract
Abstract An anisotropic membrane is provided having excellent mechanical properties combined with good permeation characteristics which comprises a vinyltriorganosilane polymer or copolymer consisting of a dense layer, of average thickness between 0.01 and 10 Mu , and a porous layer with open pores, of thickness up to 500 Mu in which the volume of the interstitial spaces in the porous layer represents 20 to 80 percent of the total volume of the membrane.
Inventors
- 👤 J Bouchilloux
- 👤 A Fabre
- 👤 A Faure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:25
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/44; C; C08; C08J; C08J9/00; C08J9/28; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/054; C08J2201/0542
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
A membrane according to claim 1 in which the thickness of the dense layer is between 0.05 and 5 Mu .
Claim 2
Dependent Claim
21 words
A membrane according to claim 1 in which the thickness of the porous layer is between 80 and 250 Mu .
Claim 3
Dependent Claim
29 words
A membrane according to claim 1 in which each of R1, R2 and R3,which may be identical or different, represents a methyl, ethyl, propyl, butyl, cyclohexyl or phenyl radical.
Claim 4
Dependent Claim
16 words
A membrane according to claim 1, in which all the units of formula (I) are identical.
Claim 5
Dependent Claim
31 words
A membrane according to claim 1, in which the units of formula (I) are of at least two types which differ in the nature of the radicals R1, R2 and/or R3.
Claim 6
Dependent Claim
34 words
A membrane according to claim 1 in which the polymer is a copolymer of a vinyltriorganosilane and another olefinic monomer, the vinyltriorganosilane being present in an amount of at least 75 percent by weight.
Claim 7
Dependent Claim
13 words
A membrane according to claim 7 in which the olefinic monomer is styrene.
Claim 8
Dependent Claim
24 words
A membrane according to claim 1 in which the polymer has an intrinsic viscosity between 70 and 200 cm3/g, measured in cyclohexane at 25*C.
Claim 9
Dependent Claim
12 words
A membrane according to claim 1 which is reinforced with a screen.
Claim 10
Dependent Claim
16 words
A membrane according to claim 10 which is reinforced with a woven polyamide or polyester fabric.
Claim 11
Dependent Claim
41 words
A method of enriching at least one component of a gas mixture comprising at least two of oxygen, nitrogen, hydrogen, carbon dioxide, helium,methane and carbon monoxide which comprises passing the gas mixture through an anisotropic membrane as defined in claim 7.
Claim 12
Dependent Claim
17 words
A method according to claim 12 in which the gas mixture is air or a hydrogen/nitrogen mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |