Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2006-04-18
2006-04-18
Sergent, Rabon (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C210S660000, C210S666000, C210S679000, C210S681000, C528S049000, C528S071000, C558S235000, C558S236000, C558S237000
Reexamination Certificate
active
07030205
ABSTRACT:
The present invention is directed to a solid chelating resin consisting of a reactive hydrophobic backbone having pendent carbodithioic groups. Preferably the resin is a poly(dithiocarbamate) containing no tertiary nitrogen groups. The invention is also directed to a novel process for making a chelating resin involving a) reacting a nucleophilic compound with carbon disulfide in a suitable solvent, to form a carbodithioic acid, b) neutralizing the carbodithioic acid with a base to form a carbodithioic acid salt; and c) reacting said carbodithioic acid salt with a crosslinking reagent in a suitable solvent to form a solid chelating resin. The chelating resin is useful in removing metals and cationic compounds from effluent streams.
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Miyazaki, Akira and Barnes, Ramom M., “Differential Determination of Chromium (VI) —Chromium (III) with Poly(dithiocarbamate) Chelating Resin and Inductively Coupled Plasma —Atomic Emission Spectrometry”, Anal. Chem. 1981, 53, 364-366.
Miyazaki, Akira and Barnes, Ramom, M., “Complexation of Some Transition Metals, Rare Earth Elements, and Thorium with a Poly(dithiocarbamate) Chelating Resin”, Anal. Chem. 1981, 53, 299-304.
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Foster, Jr. Alvie L.
Smith Maurice R.
Weidner Ivonne C.
LeCroy David P.
National Starch and Chemical Investment Holding Corporation
Sergent Rabon
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