MEMBRANES MADE FROM 6FDA, DETDA, AND DABA-BASED POLYMERS
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United States of America Patent
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Jul 2, 2015
app pub date -
Dec 26, 2013
filing date -
Dec 26, 2013
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Abstract
A polymeric membrane made of a polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units. At least some of the dianhydride-derived units are derived from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane (6FDA). At least some of the diamine-derived units are derived from 2,5-diethyl-6-methyl-1,3-diamino benzene (DETDA). The balance of the diamine-derived units are derived from a diamino benzene ring with a carboxylic acid substituent.
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