抄録
Foregoing experiments indicated that heretofore considered cause of coloration merely by the effect of peroxide is errorneous but the cause is supporsed to be due to oxalyl halide derived from the peroxide as shown by experimental facts. It was found unnecessary to exclude air during the polymerization and storage by addition of a suitable substance which is effective for inactivation of oxalyl halide. However, the addition of above a certain amount is found to be harmful in keeping the quality of polymerized methyl α-chloracrylate. It was found that the polymerization for 18-24 hours at 110-30°c gave good plastic material having high hardness. B.P.O., succinyl peroxide and peracetic acid as the catalysts, which are generally used for polymerization of vinyl compounds, are found to be effective. Since the defect of coloration of methyl α-chloracrylate for practical use was improved by an addition of suitable additive agent and ite superior hardness, mechanical strength, and heat-resistance than usual methyl methacrylate polymer, the future development of this type of plastic is much anticipated. As for substance to be added, lower monohydric alcohols, such as methanol, isopropanol and butanol, are effective additive agents and these are obtainable at low cost. By addition of additive agent, a complete exclusion of air was unnecessay and this brought a considerable improvement in the handling of the monomer in chemical and industrial operations.
