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US4609468A
Expired / Lapsed
US
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Increased strength polymer-blended membranes
Assignee: Honeywell UOP LLC
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Filing: 1984-06-01
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Granted: 1986-09-02
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Expires: 2004-06-01
Abstract
Abstract Polymer blend membranes which possess increased structural strength may be fabricated by preparing a polymer blend membrane comprising a mixture of a phosphoric acid or sulfuric acid and an organic polymer which is at least partially compatible therewith dissolved in a mutually miscible solvent. The resulting polymer blend membrane is then cast upon a porous solid support such as a glass cloth, polysulfone or ceramic and the solvent is allowed to evaporate.
Inventors
- 👤 Joan A. Cramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:00
CPC Classifications
B; B01; B01D; B01D71/00; B01D69/00; B01D69/14; B01D69/141; C; C01; C01B; C01B3/00; C01B3/50; C01B3/501; C01B3/503; G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
61 words
A supported thin film polymer blend membrane which possesses increased structural strength comprising a porous support having composited thereon an inorganic-organic blend formed as a solution phase blend in a mutually miscible solvent consisting of a phosphoric or sulfuric acid and an organic polymer selected from the group consisting of polyvinyl alcohol, polyvinyl fluoride, polyethylene oxide, polyethylene glycol, and cellulose acetate.
Claim 2
Dependent Claim
61 words
A supported thin film polymer blend membrane which possesses increased structural strength comprising a porous support having composited thereon an inorganic-organic blend formed as a solution phase blend in a mutually miscible solvent consisting of a phosphoric or sulfuric acid and an organic polymer selected from the group consisting of polyvinyl alcohol, polyvinyl fluoride, polyethylene oxide, polyethylene glycol, and cellulose acetate.
Claim 3
Dependent Claim
40 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said acid is present in said blend in an amount in the range of from about 1% to about 70% by weight of said blend.
Claim 4
Dependent Claim
41 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said organic polymer is present in said blend in an amount in the range of from about 99% to about 30% by weight of said blend.
Claim 5
Dependent Claim
31 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said blend possesses a thickness in the range of from about 0.1 to about 50 microns.
Claim 6
Dependent Claim
26 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said acid comprises orthophosphoric acid and said polymer comprises poly(vinyl alcohol).
Claim 7
Dependent Claim
26 words
The supported thin fim polymer blend membrane as set forth in claim 1 in which said acid comprises pyrophosphoric acid and said polymer comprises poly(vinyl alcohol).
Claim 8
Dependent Claim
26 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said acid comprises orthophosphoric acid and said polymer comprises cellulose acetate.
Claim 9
Dependent Claim
26 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said acid comprises sulfuric acid and said polymer comprises poly(vinyl alcohol).
Claim 10
Dependent Claim
21 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said porous support comprises glass cloth.
Claim 11
Dependent Claim
20 words
The supported thin film polymer blend membrane as set forth in claim 1 in which said porous support comprises polysulfone.
Claim 12
Independent Claim
95 words
A method for the preparation of a thin film polymer blend membrane which comprises dissolving a phosphoric or sulfuric acid and an organic polymer in a mutually miscible solvent at solution conditions for a time sufficient to form a blend consisting of said acid and said organic polymer, casting said blend onto the surface of a porous support, removing said solvent and recovering the resultant thin film polymer blend membrane which possesses increased structural support, said organic polymer selected from the group consisting of polyvinyl alcohol, polyvinyl fluoride, polyethylene oxide, polyethylene glycol, and cellulose acetate.
Claim 13
Independent Claim
95 words
A method for the preparation of a thin film polymer blend membrane which comprises dissolving a phosphoric or sulfuric acid and an organic polymer in a mutually miscible solvent at solution conditions for a time sufficient to form a blend consisting of said acid and said organic polymer, casting said blend onto the surface of a porous support, removing said solvent and recovering the resultant thin film polymer blend membrane which possesses increased structural support, said organic polymer selected from the group consisting of polyvinyl alcohol, polyvinyl fluoride, polyethylene oxide, polyethylene glycol, and cellulose acetate.
Claim 14
Dependent Claim
27 words
The method as set forth in claim 11 in which said solution conditions include a temperature in the range of from about ambient to about 100° C.
Claim 15
Dependent Claim
16 words
The method as set forth in claim 11 in which said mutually miscible solvent comprises water.
Claim 16
Dependent Claim
19 words
The method as set forth in claim 13 in which the removal of said water is effected by evaporation.
Claim 17
Dependent Claim
22 words
The method as set forth in claim 11 in which said phosphoric acid comprises orthophosphoric acid and said polymer comprises poly(vinyl alcohol).
Claim 18
Dependent Claim
21 words
The method as set forth in claim 11 in which said acid comprises pyrophosphoric acid and said polymer comprises poly(vinyl alcohol).
Claim 19
Dependent Claim
16 words
The method as set forth in claim 11 in which said porous support comprises glass cloth.
Claim 20
Dependent Claim
15 words
The method as set forth in claim 11 in which said porous support comprises polysulfone.
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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |