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AssigneesKyoto University, Otsuka Chemical Co., Ltd.
InventorsShigeru Yamago, Osamu Ito
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An organic tellurium compound is disclosed having a versatility that, when used as a living radical polymerization initiator, it is applicable to polymerization of a vinyl monomer in an aqueous vehicle without using any surfactant or dispersant. The organic tellurium compound is represented by a general formula (1), where R1 and R2 each independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, A represents an alkali metal atom or an alkaline earth metal atom, x=1 when A is monovalent, x=½ when A is divalent, and R3 is represented by a general formula (2), where in the general formula (2) R4 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, R5 and R6 each independently represent an alkylene group having 2 to 8 carbon atoms, and a represents an integer from 0 to 10.
An organic tellurium compound represented by the following general formula (1):
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Compounds containing tellurium
Polymerisation catalysts: metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide…
Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors: selected from metals not provided for in group C08F4/44
Esters: of polyhydric alcohols or polyhydric phenols , e.g. 2-hydroxyethyl acrylate or glycerol mono-acrylate
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The present invention relates to organic tellurium compounds and methods for producing the same, living radical polymerization initiators using the organic tellurium compounds and methods for producing vinyl polymers, and vinyl polymers obtained by the methods for producing vinyl polymers.
Living radical polymerization processes are polymerization processes that enable precise control of molecular structures and production of polymers having a homogeneous composition while keeping the convenience and versatility of conventional radical polymerization processes, and demonstrate superior performance on production of novel polymeric materials. Therefore, living radical polymerization techniques have recently progressed greatly and living radical polymerization processes using various approaches have been reported. Among them, the TERP (organotellurium-mediated living radical polymerization) process is a polymerization process to which particular attention has been paid in its versatility that it is applicable to polymerization of various types of vinyl monomers and in that it can highly control the molecular weights and molecular weight distributions of polymers under practical reaction conditions no different from normal radical polymerization (see Patent Literatures 1 to 4).
The TERP processes disclosed in Patent Literatures 1 to 4 are performed in a system in which a bulk material or an organic solvent is used. From the environmental and industrial viewpoints, there is demand for applicability of a TERP process to aqueous vehicles. To this end, Patent Literature 5 proposes that a surfactant and/or a dispersant is used in an aqueous vehicle.
Hereinafter, a description will be given of an example of a preferred embodiment for working of the present invention. However, the following embodiment is simply illustrative. The present invention is not at all limited by the following embodiment.
<Organic Tellurium Compound>
An organic tellurium compound according to the present invention is represented by the following general formula (1).