Method for manufacturing polyimide asymmetric membrane, and...

Details Method for manufacturing polyimide asymmetric membrane, and... Method for manufacturing polyimide asymmetric membrane, and...

2006-01-20

2009-12-08

Woodward, Ana L (Department: 1796)

Gas separation: processes

Selective diffusion of gases

Selective diffusion of gases through substantially solid...

C095S045000, C096S011000, C096S012000, C096S013000, C096S014000, C210S500390, C525S432000, C525S436000

Reexamination Certificate

active

07628841

ABSTRACT:
A process of producing an asymmetric membrane of multicomponent polyimide. The process includes the steps of (1) preparing a multicomponent polyimide blend solution by mixing a polyimide component A having a number-averaged polymerization index NAand a polyimide component B having a number-averaged polymerization index NB, wherein NAand NBsatisfies equation 1:in-line-formulae description="In-line Formulae" end="lead"?2.35×NA−2.09<NB<450×NA−1.12  1in-line-formulae description="In-line Formulae" end="tail"?(2) subjecting the multicomponent polyimide blend solution to further polymerization and imidation reaction, and (3) causing a phase inversion in the resulting multicomponent polyimide blend solution to form an asymmetric membrane. The polyimide component A is raw materials of polyimide A containing a fluorine atom in the chemical structure thereof and/or a polymerization and imidation reaction product of the raw materials. The polyimide component B is raw materials of polyimide B and/or a polymerization and imidation reaction product of the raw materials.

REFERENCES:
patent: 5055116 (1991-10-01), Kohn et al.
patent: 6-269650 (1994-09-01), None
patent: 8-52332 (1996-02-01), None
patent: 2003-24755 (2003-01-01), None

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