Polyimide aliphatic polyester copolymers (C-2356)
AssigneeExxon Research & Engineering Co.
InventorsW. S. Winston Ho, Guido Sartori, Warren A. Thaler, David C. Dalrymple
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Abstract
A new copolymer composition comprising the hard segment of a polyimide and the soft segment of an oligomeric aliphatic polyester. The new polyimide copolymer membranes have exhibited high thermal stability for separation of an aromatic/saturate mixture. These new membranes have higher aromatic/saturate selectivity than polyurethanes.
Claims15
A copolymer composition of matter comprising a hard segment having a glass transition temperature (Tg) of greater than 130.degree. C. and a soft segment having a Tg less than the Tg of the hard segment, having properties for enabling separations of aromatics from saturates when used in a membrane.
A copolymer composition of matter comprising the hard segment of a polyimide and the soft segment of an oligomeric aliphatic polyester, wherein said polyimide is derived from a dianhydride having between 8 and 20 carbons and a diamine having between 2 and 30 carbons, and said oligomeric aliphatic polyester is a polyadipate, a polysuccinate, a polymalonate, a polyoxalate or a polyglutarate.
Dependencies are inferred from the claim text.