Abstract
Such alkylboron derivatives as dialkylboron chloride, dialkylborinic acid, dialkylboronous ester, and dialkylboron oxide as the catalysts for the polymerization of vinyl compounds were studied. Although dialkylborinic acid was a good catalyst, it was pretty difficult to isolate it purely, therefore, only a brief description was made in this paper. Of course, some dialkylborinic acids can be isolated purely under suitable conditions. In regard to this, further investigation will be performed. The polymerization rates of styrene with these catalysts, the relation between the conversion and the intrinsic viscosity, and the influence of oxygen on the polymerization rate were studied. The polymerization rate of some monomers with dialkylboronous ester is maximum when O2/catalyst in mole ratio is 0.22.

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