Patent US4950314A successfully refreshed from Google Patents.
US4950314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separation membrane
Assignee: Toray Industries Inc
•
Filing: 1989-03-07
•
Granted: 1990-08-21
•
Expires: 2009-03-07
Abstract
Abstract A gas separation membrane with excellent gas separation properties is disclosed. The gas separation membrane is substantially free from pinholes and consists essentially of a crosslinked polyolefin or a crosslinked polyarylene oxide. This gas separation membrane is produced by evaporating a solution containing a polyolefin or a polyarylene oxide having an active functional group which can form crosslinking site therebetween or which can react with a crosslinking agent to form a crosslinking site.
Inventors
- 👤 Shinichi Yamada
- 👤 Kuniyasu Shiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:46
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485; B; B01; B01D; B01D67/00; B01D67/0002; B01D69/00; B01D69/02; B01D71/00; B01D71/06; B01D71/52; B01D71/522; B01D71/5223; B01D71/76; B01D71/82; B01D2323/00; B01D2323/12; B01D2323/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
43 words
A gas separation membrane consisting essentially of a crosslinked polyolefin or a crosslinked polyarylene oxide, which gas separation membrane is produced by evaporating a solution containing polyolefin or a polyarylene oxide having an active functional group which can autogenically form crosslinking sites therebetween.
Claim 2
Dependent Claim
43 words
A gas separation membrane consisting essentially of a crosslinked polyolefin or a crosslinked polyarylene oxide, which gas separation membrane is produced by evaporating a solution containing polyolefin or a polyarylene oxide having an active functional group which can autogenically form crosslinking sites therebetween.
Claim 3
Dependent Claim
16 words
The gas separation membrane of claim 1, wherein the crosslinking sites are formed of oligosiloxane bonds.
Claim 4
Dependent Claim
48 words
The gas separation membrane of claim 2, wherein the oligosiloxane bond is expressed by the formula: ##STR6## wherein X 1 , X 2 , X 3 and X 4 independently represents --OSi--, alkyl, aryl, alkoxy, acetoxy, oxime or hydroxyl and n represents an integer of 1 to 3.
Claim 5
Dependent Claim
21 words
The gas separation membrane of claim 1, wherein the polyolefin is composed of olefin units containing 2 to 18 carbon atoms.
Claim 6
Dependent Claim
16 words
The gas separation membrane of claim 1, wherein the polyolefin is mainly composed of α-olefin units.
Claim 7
Dependent Claim
18 words
The gas separation membrane of claim 1, wherein the polyolefin comprises at least one of polypropylene and poly(4-methylpentene).
Claim 8
Dependent Claim
51 words
The gas separation membrane of claim 1, wherein the polyarylene oxide is expressed by the formula: ##STR7## wherein m represents an integer of 1-3, n represents an integer of not less than 75, R represents, the same or different, alkyl, substituted alkyl, phenyl, substituted phenyl, halogen, alkoxy, alkenyl, alkynyl or amino).
Claim 9
Dependent Claim
16 words
The gas separation membrane of claim 7, wherein the polyarylene oxide consists essentially of poly(2,6-dimethyl-1,4-phenylene oxide).
Claim 10
Dependent Claim
26 words
The gas separation membrane of claim 1, wherein the polyarylene oxide has a non-crosslinking silicon-containing group selected from the group consisting of organosilyl, organosiloxane and organosilalkylene.
Claim 11
Dependent Claim
17 words
The gas separation membrane of claim 1, wherein the active functional group is an active silyl group.
Claim 12
Dependent Claim
23 words
The gas separation membrane of claim 10, wherein the active silyl group is selected from the group consisting of alkoxysilyl, acetoxysilyl and oximesilyl.
Claim 13
Dependent Claim
20 words
The gas separation membrane of claim 1, further comprising a porous support on which the gas separation membrane is laminated.
Claim 14
Dependent Claim
30 words
The gas separation membrane of claim 1, wherein the solution contains a crosslinking catalyst selected from the group consisting of organotin, a salt of carboxylic acid, amine and titannic ester.
Claim 15
Dependent Claim
12 words
The gas separation membrane of claim 1, which is an asymmetric membrane.
Claim 16
Dependent Claim
34 words
A composite gas separation membrane comprising: a porous support; a first gas permeable layer formed on the porous support; and a gas separation layer consisting essentially of the gas separation membrane of claim 1.
Claim 17
Dependent Claim
16 words
The gas separation membrane of claim 1, which has a thickness of 1 to 300 μm.
References Cited (Backward Citations)
US3350844A
Cited
US4292417A
Cited
US4132824A
Cited
JPS54146277A
Cited
US4280970A
Cited
JPS5628605A
Cited
JPS5640413A
Cited
JPS5692925A
Cited
JPS5692926A
Cited
JPS5691916A
Cited
EP0080617A1
Cited
US4493714A
Cited
US4488886A
Cited
JPS5930169A
Cited
JPS5932903A
Cited
JPS5959214A
Cited
JPS5969104A
Cited
JPS59112802A
Cited
JPS59186602A
Cited
US4631075A
Cited
JPS59222203A
Cited
JPS6051525A
Cited
US4468500A
Cited
EP0130963A1
Cited
US4468503A
Cited
US4468502A
Cited
US4530703A
Cited
US4468501A
Cited
JPS6071004A
Cited
US4551156A
Cited
JPS60175505A
Cited
US4636229A
Cited
EP0160435A2
Cited
JPS60216802A
Cited
JPS60257803A
Cited
EP0181772A2
Cited
JPS627418A
Cited
JPS6230524A
Cited
JPS6253373A
Cited
EP0214792A2
Cited
JPS62216624A
Cited
JPS62216623A
Cited
US4695295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |