Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2006-11-22
2008-08-05
Anderson, Rebecca L (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
active
07408070
ABSTRACT:
A method for purifying bisimides is provided. In one aspect, purified oxybisphthalimides, intermediates useful in the preparation of polyetherimides are provided. In one embodiment, a first solution containing a bisimide compound, a solvent, and a phase transfer catalyst is contacted with a solid inorganic adsorbent material having a total pore volume of about 0.5 milliliters/gram or greater and a cumulative pore volume distribution of about 20 percent or greater of particles having a pore diameter in a range between about 3 nanometers and about 20 nanometers. The solution containing the bisimide compound is then separated from the solid inorganic adsorbent material to provide a purified bisimide compound which is substantially free of the phase transfer catalyst. The purification technique is especially valuable for preparing high purity oxybisphthalimides, such as 4,4′-oxybis(N-methylphthalimide), which are substantially free of residual phase transfer catalyst.
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Elliot P. Barrett et al., “The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations From Nitrogen Isotherms”, Contribution from the Multiple Fellowship of Baugh and Sons Company, Mellon Institute, vol. 73, pp. 373-380, Jan. 1951.
Hall David Bruce
Stella Albert Santo
Anderson Rebecca L
Chu Yong
SABIC Innovative Plastics IP B.V.
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