Method of making a high molecular weight, monoesterified...

Details Method of making a high molecular weight, monoesterified... Method of making a high molecular weight, monoesterified...

2011-07-19

2011-07-19

Woodward, Ana L (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S419000, C525S420000

Reexamination Certificate

active

07981974

ABSTRACT:
The present disclosure relates to a high molecular weight, monoesterified polyimide polymer. One method as described herein relates to making the high molecular weight, monoesterified polyimide polymer. According to its broadest aspect, the method for making the high molecular weight, monoesterified polyimide polymer comprises the following steps: (a) preparing a polyimide polymer comprising carboxylic acid functional groups from a reaction solution comprising monomers and at least one solvent; and (b) treating the polyimide polymer with a diol at esterification conditions in the presence of dehydrating conditions to form a monoesterified polyimide polymer, wherein the dehydrating conditions at least partially remove water produced during step (b). Such high molecular weight, monoesterified polyimide polymers are useful in forming crosslinked polymer membranes for the separation of fluid mixtures.

REFERENCES:
patent: 4654415 (1987-03-01), Ahne et al.
patent: 4728345 (1988-03-01), Murphy
patent: 4808686 (1989-02-01), Cella et al.
patent: 5085676 (1992-02-01), Ekiner et al.
patent: 5104532 (1992-04-01), Thompson et al.
patent: 5288304 (1994-02-01), Koros et al.
patent: 6184333 (2001-02-01), Gray
patent: 6527987 (2003-03-01), Yabuki et al.
patent: 6755900 (2004-06-01), Koros et al.
patent: 6897921 (2005-05-01), Furukawa et al.
patent: 6932859 (2005-08-01), Koros et al.
patent: 7247191 (2007-07-01), Koros et al.
patent: 2003/0221559 (2003-12-01), Koros et al.
patent: 2005/0268783 (2005-12-01), Koros et al.
patent: 2007/0117960 (2007-05-01), Kizuka et al.
International Search Report from PCT/US09/00033 mailed Mar. 9, 2009.
Koros, W.J. and Fleming, G.K., “Membrane-based gas separation”,Journal of Membrane Science83:1-80 (1993).
Ekiner O.M. and Vassilatos, G., “Polyaramide Hollow Fibers for Hydrogen/Methane Separation—Spinning and Properties”,Journal of Membrane Science53:259-273 (1990).
Prasad et al., “Evolution of membranes in commercial air separation”,J. Membrane Sci94:225-248 (1994).
Wind, et al., “Solid-State Covalent Cross-Linking of Polyimide Membranes for Carbon Dioxide Plasticization Reduction”,Macromolecules36:1882-1888 (2003).
Wallace, et al., “Efficient development of effective hollow fiber membranes for gas separations from novel polymers”,Journal of Membrane Science278:92-104 (2006).
Wallace, D., Crosslinked Hollow Fiber Membranes for Natural Gas Purification and their Manufacture from Novel Polymers, Ph.D. Dissertation, University of Texas, Aug. 2004.
Staudt-Bickel, C. and Koros, W.J., “Improvement of CO2/CH4 separation characteristics of polyimides by chemical crosslinking”Jr. Membrane Sci. vol. 155:145-154 (1999).

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