EP0152011A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Gas-permeable laminate
Assignee: Teijin Ltd
•
Filing: 1985-01-29
•
Granted: —
•
Expires: 2005-01-29
Abstract
Abstract A gas-permeable laminate for separating a specific gas from a gaseous mixture comprising a gas-permeable membrane having excellent selectivity for the specified gas and a porous support supporting said membrane, said gas-permeable membrane being a multilayer laminated membrane comprising at least a first and a second ultrathin membrane having exceltent selectivity for the specified gas and a third ultrathin film of a different material from the materials of the first and second ultrathin membranes and located between the first and second ultrathin membranes, the material of the third ultrathin membrane having a higher permeation coefficient with respect to the specified gas than the materials of the first and second ultrathin membranes.
Inventors
- 👤 Takeyoshi Yamada
- 👤 Kazumi Iwata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:49
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/70; B01D71/701; B01D69/00; B01D69/10; B01D69/107; B01D69/1071; B01D69/12; B01D69/1216; B01D71/26; B01D71/261; B01D71/262; B01D71/44; B01D71/76; B01D71/80
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
A gas-permeable laminate for separating a specific gas from a gaseous mixture comprising a gas-permeable membrane having excellent selectivity for the specified gas and a porous support supporting said membrane, said gas-permeable membrane being a multilayer laminated membrane comprising at least a first and a second ultrathin membrane having excellent selectivity for the specified gas and a third ultrathin film of a different material from the materials of the first and second ultrathin membranes and located between the first and second ultrathin membranes, the material of the third ultrathin membrane having a higher permeation coefficient with respect to the specified gas than the materials of the first and second ultrathin membranes.
Claim 2
Dependent Claim
111 words
A gas-permeable laminate for separating a specific gas from a gaseous mixture comprising a gas-permeable membrane having excellent selectivity for the specified gas and a porous support supporting said membrane, said gas-permeable membrane being a multilayer laminated membrane comprising at least a first and a second ultrathin membrane having excellent selectivity for the specified gas and a third ultrathin film of a different material from the materials of the first and second ultrathin membranes and located between the first and second ultrathin membranes, the material of the third ultrathin membrane having a higher permeation coefficient with respect to the specified gas than the materials of the first and second ultrathin membranes.
Claim 3
Dependent Claim
21 words
The laminate of claim 1 wherein one of the first and second ultrathin membranes is in contact with the porous support.
Claim 4
Dependent Claim
24 words
The laminate of claim 1 or 2 wherein the gas-permeable membrane is of a three-layer structure consisting of the first, second and third layer.
Claim 5
Dependent Claim
104 words
The laminate of claim 1 wherein the porous support has a non-smooth surface condition such that when two layers of an ultrathin membrane of poly(4-methylpentene-l) are laminated to a thickness of about 0.03 to 0.05 micrometer onto the above porous support and air is sucked at 20°C and atmospheric pressure through the two-layer ultrathin membrane from the side of the porous support to reduce the pressure of the atmosphere on the side of the porous support to 160 mmHg, the sucking action causes damage to the two-layer ultrathin membrane and gives oxygen-enriched air having an oxygen concentration of 35% by volume at the highest.
Claim 6
Dependent Claim
53 words
The laminate of claim 1 at least one of the first and second ultrathin membranes has a selectivity, defined by the following equation, of at least 2.5; wherein a represents the selectivity, PO 2 is the oxygen gas permeation coefficient [cc(STP)-cm/cm 2 -sec-cmHg] and PN 2 is the nitrogen gas permeation coefficient. 2
Claim 7
Dependent Claim
26 words
The laminate of claim 5 wherein the selectivity of the third ultrathin membrane is lower than that of each of the first and second ultrathin membranes.
Claim 8
Dependent Claim
17 words
The laminate of claim 5 wherein the selectivity of the third ultrathin membrane is at least 2.
Claim 9
Dependent Claim
16 words
The laminate of claim 5 wherein the selectivity of the laminated membrane is at least 2.8.
Claim 10
Dependent Claim
25 words
The laminate of claim 1 wherein at least one of the first and second ultrathin membranes has a thickness of about 0.01 to 0.2 micrometer.
Claim 11
Dependent Claim
19 words
The laminate of claim 1 wherein the third ultrathin membrane has a thickness of about 0.02 to 1 micrometer.
Claim 12
Dependent Claim
26 words
The laminate of claim 1 wherein the laminated membrane composed of the first, second and third ultrathin membranes has a thickness of about 0.04 to 1.4.micrometers.
Claim 13
Dependent Claim
23 words
The laminate of claim 1 wherein the pores of the porous support have an average equivalent diameter of not more than 0.08 micrometer.
Claim 14
Dependent Claim
19 words
The laminate of claim 1 wherein the porous support has a degree of surface opening of 5 to 40%.
Claim 15
Dependent Claim
39 words
The laminate of claim 1 wherein the first and second ultrathin membranes are produced from an addition polymer of at least one unsaturated compound selected from hydrocarbon compounds and silane compounds having a polymerizable carbon-carbon double or triple bond.
Claim 16
Dependent Claim
62 words
The laminate of claim 1 wherein the third ultrathin membrane is produced from polydimethylsiloxane, a polysiloxane/polycarbonate copolymer, a polysiloxane/ ethylene copolymer, a polysiloxane/polybutadiene copolymer, a polysiloxane/polyvinyltrimethylsilane copolymer, a polytetramethyldisiloxane/ethylene copolymer, a polydimethyl- siloxane/siliphenylene copolymer, a polydimethylsiloxane/ alkylene oxide copolymer, polysiliphenylene, a crosslinked polymer of oligohydroxystyrene and siloxane having a group reactive with the hydroxyl group of the oligohydroxystyrene, or poly(vinylmethyldimethysiloxane/methyl hydrogen dimethylsiloxane).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.