IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0412639
(2009-03-27)
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등록번호 |
US-8561812
(2013-10-22)
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발명자
/ 주소 |
- Liu, Chunqing
- Tang, Man-Wing
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
6 인용 특허 :
17 |
초록
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The present invention discloses blend polymer membranes comprising thermally rearranged polymers derived from aromatic polyimides containing ortho-positioned functional groups and methods for making and using these blend polymer membranes. The blend polymer membranes described in the current inventi
The present invention discloses blend polymer membranes comprising thermally rearranged polymers derived from aromatic polyimides containing ortho-positioned functional groups and methods for making and using these blend polymer membranes. The blend polymer membranes described in the current invention are prepared by heat treatment of blend polymer membranes comprising aromatic polyimides containing ortho-positioned functional groups such as —OH or —SH groups. In some instances, an additional crosslinking step is performed to improve the selectivity of the membrane. These blend polymer membranes have improved flexibility, reduced cost, improved processability, and enhanced selectivity and/or permeability compared to the comparable polymer membranes that comprise a single polymer.
대표청구항
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1. A process for making a blend polymer membrane consisting of synthesizing a first glassy polymer wherein said first glassy polymer is an aromatic polyimide comprising pendent functional groups ortho to heterocyclic imide nitrogen in a polymer backbone of said aromatic polyimide; fabricating a blen
1. A process for making a blend polymer membrane consisting of synthesizing a first glassy polymer wherein said first glassy polymer is an aromatic polyimide comprising pendent functional groups ortho to heterocyclic imide nitrogen in a polymer backbone of said aromatic polyimide; fabricating a blend polymer membrane from said first glassy polymer and a second glassy polymer, different from said first glassy polymer; and converting the blend polymer membrane to a thermally rearranged blend polymer membrane by heating said blend polymer membrane at a temperature from about 300 to 600° C. such that under operating conditions of a separation using the blend polymer membrane the operating temperature is lower than the glass transition temperatures of both glassy polymers of the blend polymer membrane wherein said blend polymer membrane fabricated from said first glassy polymer and said second glassy polymer by heat treatment to a crosslinking step. 2. The process of claim 1 wherein said crosslinking step comprises subjecting said blend polymer membrane to UV radiation or reaction with a chemical crosslinking composition. 3. The process of claim 1 wherein said first glassy polymer comprises a plurality of first repeating units of a formula (I), wherein said formula (I) is: where —X1— of said formula (I) is selected from the group consisting of and mixtures thereof, —X2— of said formula (I) is selected from the group consisting of and mixtures thereof, and —R— is selected from the group consisting of and mixtures thereof. 4. The process of claim 1 wherein said first glassy polymer is a UV cross-linkable polyimide with formula (I), wherein said formula (I) is: where —X1— of said formula (I) is selected from the group consisting of and mixtures thereof, —X2— of said formula (I) is selected from the group consisting of and mixtures thereof, and —R— is selected from the group consisting of and mixtures thereof. 5. The process of claim 1 wherein said second glassy polymer is selected from the group consisting of polysulfones, sulfonated polysulfones, polyethersulfones, sulfonated polyethersulfones, polyetherimides, or polyimides including poly(3,3′,4,4′-benzophenone tetracarboxylic dianhydride-pyromellitic dianhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (poly(BTDA-PMDA-TMMDA)), poly(3,3′,4,4′-benzophenone tetracarboxylic dianhydride-pyromellitic dianhydride-4,4′-oxydiphthalic anhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (poly(BTDA-PMDA-ODPA-TMMDA)), poly(3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (poly(DSDA-TMMDA)), poly(3,3′,4,4′-benzophenone tetracarboxylic dianhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (poly(BTDA-TMMDA)), and poly(3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride-pyromellitic dianhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (poly(DSDA-PMDA-TMMDA. 6. The process of claim 1 wherein said first glassy polymer is selected from the group consisting of poly[2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane] (poly(6FDA-APAF)), poly[3,3′,4,4′-benzophenonetetracarboxylic dianhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane] (poly(BTDA-APAF)), poly(3,3′,4,4′-benzophenonetetracarboxylic dianhydride-3,3′-dihydroxy-4,4′-diamino-biphenyl) (poly(BTDA-HAB)), poly[4,4′-oxydiphthalic anhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane] (poly(ODPA-APAF)), poly[3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane] (poly(DSDA-APAF)), poly(3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride-3,3′-dihydroxy-4,4′-diamino-biphenyl) (poly(DSDA-HAB)), poly[2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride-3,3′,4,4′-benzophenonetetracarboxylic dianhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane] (poly(6FDA-BTDA-APAF)), poly[4,4′-oxydiphthalic anhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane-3,3′-dihydroxy-4,4′-diamino-biphenyl] (poly(ODPA-APAF-HAB)), poly[3,3′,4,4′-benzophenonetetracarboxylic dianhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane-3,3′-dihydroxy-4,4′-diamino-biphenyl] (poly(BTDA-APAF-HAB)), poly[2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride-3,3′-dihydroxy-4,4′-diamino-biphenyl] (poly(6FDA-HAB)), and poly(4,4′-bisphenol A dianhydride-3,3′,4,4′-benzophenonetetracarboxylic dianhydride-2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane] (poly(BPADA-BTDA-APAF)). 7. The process of claim 1 wherein said second glassy polymer is selected from the group consisting of polysulfones; sulfonated polysulfones; polyethersulfones; sulfonated polyethersulfones; polyvinylpyrrolidones; polyetherimides; cellulosic polymers; polyamides; polyimides; polyamide/imides; polyketones, polyether ketones; poly(vinyl amides), poly(benzobenzimidazole); polyhydrazides; polyoxadiazoles; polytriazoles; polycarbodiimides; polyphosphazines; and polymers of intrinsic microporosity. 8. The process of claim 1 wherein said blend polymer membrane has a structure selected from the group consisting of a nonporous or porous symmetric structure, an asymmetric structure having a thin nonporous or a porous selective layer supported on top of a porous support layer, and an asymmetric structure having a thin nonporous or porous selective layer made from the blend polymers supported on top of a porous support layer made from a different polymer material or an inorganic material.
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