Coating processes – Particles – flakes – or granules coated or encapsulated
Reexamination Certificate
2003-09-11
2010-10-26
Cleveland, Michael (Department: 1712)
Coating processes
Particles, flakes, or granules coated or encapsulated
C427S430100, C428S411100, C210S263000
Reexamination Certificate
active
07820240
ABSTRACT:
One object of the present invention is to produce a weakly acidic cation exchanger under mild conditions. Another object of the present invention is to produce a more firm weakly acidic cation exchange film. Still another object of the present invention is to provide a weakly acidic cation exchanger capable of realizing high-level separation of monovalent cation and simultaneously analyzing monovalent cation and divalent cation and also provide a chromatography column using the ion exchanger. In the production method of a weakly acidic cation exchanger of the invention, a solvent incapable of dissolving a polymer having a double bond within the molecule is used and the weakly acidic cation exchanger is produced by polymerization at temperature of 100? ° C. or less. When an α,β-unsaturated dibasic acid derivative is dissolved in the solvent, the α,β-unsaturated dibasic acid derivative reacts with the polymer and a more firm film can be formed. Furthermore, when the weakly acidic cation exchanger obtained by this process is packed in a column, monovalent cation can be separated in high level.
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Cleveland Michael
Showa Denko K.K.
Sughrue & Mion, PLLC
Vetere Robert
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