Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
A membrane comprising a polyestercarbonate of the formula wherein wherein the membrane has a separation factor for oxygen and nitrogen of 6.5 or greater at 24°C. each R¹ independently is -CO-, -SO₂-, -O-, a single direct bond, a C 1-6 divalent hydrocarbon radical, a C 1-6 divalent fluorocarbon radical, or an inertly substituted C 1-6 divalent hydrocarbon radical; each R² independently is a C 1-20 divalent hydrocarbon radical or a C 1-20 divalent hydrocarbon radical , substituted with one or more halo moieties; W is the residue of a monofunctional compound which is reactive with a chloroformate functionality; x is 0 or 1; y is 0 or 1; n is 50 or greater; and with the proviso that the ratio of units wherein x = 1 to units wherein y = 1 is between t 99:1 to 1:99, inclusive.
Claim 2
Dependent Claim
139 words
A membrane comprising a polyestercarbonate of the formula wherein wherein the membrane has a separation factor for oxygen and nitrogen of 6.5 or greater at 24°C. each R¹ independently is -CO-, -SO₂-, -O-, a single direct bond, a C 1-6 divalent hydrocarbon radical, a C 1-6 divalent fluorocarbon radical, or an inertly substituted C 1-6 divalent hydrocarbon radical; each R² independently is a C 1-20 divalent hydrocarbon radical or a C 1-20 divalent hydrocarbon radical , substituted with one or more halo moieties; W is the residue of a monofunctional compound which is reactive with a chloroformate functionality; x is 0 or 1; y is 0 or 1; n is 50 or greater; and with the proviso that the ratio of units wherein x = 1 to units wherein y = 1 is between t 99:1 to 1:99, inclusive.
Claim 3
Dependent Claim
84 words
A membrane as claimed in Claim 1 wherein each R¹ independently is a direct bond, a C 1-6 divalent hydrocarbon radical, a C 1-6 divalent fluorocarbon radical, or an inertly substituted divalent C 1-6 hydrocarbon radical; each R² independently is a divalent C 1-20 aliphatic, C 5-20 cycloaliphatic, C 6-20 aromatic, a halo-substituted C 6-20 aromatic, a halo-substituted C 1-20 aliphatic, or a halo-substituted C 5-20 cycloaliphatic hydrocarbon radical; and W is the residue of a monofunctional aliphatic alcohol, aromatic alcohol, thiol, or amine.
Claim 4
Dependent Claim
52 words
A membrane as claimed in Claim 2 wherein each R¹ independently is a divalent C 1-6 hydrocarbon radical; each R² independently is a divalent C 5-20 cycloaliphatic, C 6-20 aromatic radical, a halo-subtituted C 5-20 cycloaliphatic, or a C 6-20 halo-substituted aromatic hydrocarbon radical; and W is a C 1-20 hydrocarbyloxy radical.
Claim 5
Dependent Claim
53 words
A membrane as claimed in Claim 3 wherein each R¹ independently is a divalent C 1-6 alkylidene; each R² independently is wherein each R³ independently is chlorine, fluorine, phenyl, or halogenated alkyl; a is 0 to 4; and W is a C 1-20 alkoxy, C 6-20 aryloxy, or C 7-20 alkyl-substituted aryloxy radical.
Claim 6
Dependent Claim
21 words
A membrane as claimed in Claim 4 wherein each R¹ is propylidene; each R² is W is para-tertiary butylphenyloxy or methoxy.
Claim 7
Dependent Claim
24 words
A membrane as claimed in Claim 5 wherein the polyestercarbonate is derived from bisphenol A, and a mixture of terephthaloyl chloride and isophthaloyl chloride.
Claim 8
Independent Claim
71 words
A method of separating oxygen from a mixture of gases containing oxygen and nitrogen, which method comprises: (a) contacting the gas mixture with one side of a membrane as claimed in any one of Claims 1 to 6 while maintaining a pressure difference across the membrane with the lower pressure being on the other side of the membrane, and (b) removing the permeated oxygen from the other side of the membrane.
Claim 9
Dependent Claim
42 words
A method as claimed in Claim 7 wherein the gas mixture is contacted with the membrane at a temperature of from 0° to 80°C and the pressure difference across the membrane is from 40 psig (275 kPa) to 200 pisg (1400 kPa).
Claim 10
Dependent Claim
23 words
The method of Claim 8 wherein the pressure difference across the membrane is from 95 pisg (650 kPa) to 120 pisg (830 kPa).
Claim 11
Dependent Claim
25 words
The method of Claim 8 or Claim 9 wherein the gas mixture is contacted with the membrane at a temperature of from 5° to 45°C.