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US3803061A Expired / Lapsed US ⏱️ 0.0 years remaining

Microporous phenolic polyether membranes

Assignee: Rhone Poulenc SA
•
Filing: 1972-07-18
•
Granted: 1974-04-09
•
Expires: 1992-07-18
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Abstract

Abstract Microporous phenolic polyether membranes are provided having utility in electricity generators, devices for the oxygenation of the blood, degassing of solution, ultrafiltration and the like. These membranes comprise a film of a phenolic polyether which has, on each of its faces, pores of diameter between about 0.1 and 25 Mu , at least some of these pores passing through the entire thickness of the membrane. They can be obtained by: A. FORMING A SOLUTION OF THE PHENOLIC POLYETHER WITH A SOLVENT AND A NON-SOLVENT FOR THIS POLYMER, THE SOLVENT AND NON-SOLVENT BEING MISCIBLE WITH ONE ANOTHER, B. CASTING THIS SOLUTION ON A TEMPORARY SUPPORT, C. LEAVING THE POLYMER LAYER ON THE SUPPORT IN AIR FOR ABOUT 1 SECOND TO 3 MINUTES, AT A TEMPERATURE OF BETWEEN 10*C and the boiling point of the most volatile constituent of the solution, D. IMMERSING THE POLYMER LAYER, STILL ON ITS SUPPORT, IN A COAGULATION BATH, AND E. SEPARATING THE MEMBRANE FROM THE SUPPORT AND DRYING IT.

Inventors

  • 👤 A Fabre
  • 👤 A Faure

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 04:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; B; B01; B01D; B01D71/00; B01D71/06; B01D71/52; B29; B29C; B29C67/00; B29C67/20; B29C67/202; C08J2371/00; C08J2371/08; C08J2371/10; C08J2371/12; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/40; Y10T442/60; Y10T442/674

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 37 words
A membrane according to claim 1 in which Q and Q'' both represent a phenyl radical and y is 0, or has an average value between 0.5 and 2 in which case A represents a chlorine atom.
Claim 2
Dependent Claim 29 words
A membrane according to claim 1 in which the specific viscosity of the phenolic polyether is between 0.3 and 1.5 (measured at 25*C as a 5g/l solution in cyclohexanone).
Claim 3
Dependent Claim 21 words
A membrane according to claim 3 in which the said specific viscosity of the phenolic polymer is between 0.5 and 1.
Claim 4
Dependent Claim 24 words
A membrane according to claim 1 in which the film is reinforced by a woven, non-woven or knitted fabric of natural or synthetic fibres.
Claim 5
Dependent Claim 107 words
Process for preparing a phenolic polyether membrane as claimed in claim 1 which comprises: a. forming a solution of the phenolic polyether with a solvent and a non-solvent for this polymer, the solvent and non-solvent being miscible with one another, b. casting this solution on a temporary support, c. leaving the polymer layer on the support in air for about 1 second to 3 minutes, at a temperature of between 10*C and the boiling point of the most volatile constituent of the solution, d. immersing the polymer layer, still on its support, in a coagulation bath, and e. separating the membrane from the support and drying it.
Claim 6
Dependent Claim 29 words
Process according to claim 6 in which the solvent for the polymer is cyclohexane, benzene, toluene, dichloromethane, dichloroethylene, trichloroethylene, tetrachloroethylene, chloroform, dichlorobenzene, monochlorobenzene, cyclohexanone, N-methyl-2-pyrrolidone, dimethylformamide, dimethylacetamide or tetrahydrofurane.
Claim 7
Dependent Claim 26 words
Process according to claim 6 in which the non-solvent for the polymer is water, methanol, ethanol, primary, secondary or tertiary butanol, acetone or methyl ethyl ketone.
Claim 8
Dependent Claim 26 words
Process according to claim 6 in which the non-solvent amounts to between about 8 and 15 percent by weight based on the weight of the solution.
Claim 9
Dependent Claim 18 words
Process according to claim 6 in which the coagulation bath comprises methanol, ethanol or an aqueous solution thereof.
Claim 10
Dependent Claim 14 words
A phenolic polyether membrane whenever prepared by a process as defined in claim 6.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-04-08 1977-10-08 1978-04-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-04-08 1981-10-08 1982-04-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-04-08 1985-10-08 1986-04-09 $7700.00 Window Closed / Lapsed

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