US5007945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membranes formed from aromatic polyarylates
Assignee: Air Products and Chemicals Inc
•
Filing: 1990-04-12
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Granted: 1991-04-16
•
Expires: 2010-04-12
Abstract
Abstract The present invention is a class of polymeric membranes formed from aromatic polyarylates derived from dicarboxylic acid chlorides and cardo bisphenols having halo substituents on all portions ortho to the hydroxy functions. These polyarylate membranes exhibit high gas permselectivities and are useful in various gas separation applications.
Inventors
- 👤 Chao-Fong Tien
- 👤 Andrew D. Surnamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:28
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; B; B01; B01D; B01D71/00; B01D71/06; B01D71/48; B01D71/481
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
50 words
A semi-permeable membrane formed from a polyarylate containing polymerizable units of the formula: ##STR10## Wherein Ar is a C 1 -C 20 divalent hydrocarbon radical; R 1 and R 2 are independently halo substituents; n is an integer greater than 50; and L is a multicyclo bridging group or ##STR11##
Claim 2
Dependent Claim
50 words
A semi-permeable membrane formed from a polyarylate containing polymerizable units of the formula: ##STR10## Wherein Ar is a C 1 -C 20 divalent hydrocarbon radical; R 1 and R 2 are independently halo substituents; n is an integer greater than 50; and L is a multicyclo bridging group or ##STR11##
Claim 3
Dependent Claim
11 words
A membrane in accordance with claim 1 wherein L is ##STR12##
Claim 4
Dependent Claim
22 words
A membrane in accordance with claim 1 wherein Ar is selected from the group consisting of: ##STR13## and mixtures of the above.
Claim 5
Dependent Claim
15 words
A membrane in accordance with claim 1 wherein R 1 and R 2 are Br.
Claim 6
Dependent Claim
14 words
A membrane in accordance with claim 1 wherein L is a tricyclo bridging group.
Claim 7
Dependent Claim
14 words
A membrane in accordance with claim 1 wherein L is a bicyclo bridging group.
Claim 8
Dependent Claim
19 words
A membrane in accordance with claim 6 wherein L is a bicyclo bridging group having the structural formula: ##STR14##
Claim 9
Dependent Claim
16 words
A membrane in accordance with claim 1 wherein L is a fused ring multicyclo bridging group.
Claim 10
Dependent Claim
22 words
A membrane in accordance with claim 8 wherein said fused ring multicyclo bridging group is selected from the group consisting of: ##STR15##
Claim 11
Dependent Claim
86 words
A process for separating a component of a gas mixture containing at least one other component, said process comprising: bringing said gas mixture into contact with the membrane of claim 1 which is selectively permeable toward one component of said gas mixture, whereby said component selectively permeates through said membrane from a feed side having both a higher partial pressure of said component and a higher total pressure to a permeate side having and a lower partial pressure of said component and a lower total pressure.
Claim 12
Dependent Claim
20 words
A process in accordance with claim 10 wherein the gas mixture is air and oxygen selectively permeates through the membrane.
Claim 13
Dependent Claim
15 words
A process in accordance with claim 10 wherein the gas mixture contains nitrogen and oxygen.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |