不均斉化ロジンのカリウムセッケンの性状がスチレン-ブタジエンの乳化重合に及ぼす影響

概要

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Influences on emulsion polymerization of stylene and butadiene with K-soaps of disproportionated rosins under hydrogen stream which is considered effective because of low contents of phenolic matter were investigated. The yield of polymer was not affected with disproportionated rosins, having value less than 2.3 in extinction coefficient at 241 mμ (α241) in ultraviolet absorption spectra, but disproportionated rosins, having value more than 2.8 in α241, indicated the tendency to decrease the yield of polymer. The yield of polymer was not affected with amounts of unsaponifiable matter contained in K-soaps. The yield of polymer was scarcely affected with amounts of free resin acid contained in K-soap and large amounts (15 as acid value) of free acid indicated the tendency that the yield of polymer would be a little up. The tests on stability of latex polymerized with K-soaps having various α241 value, amounts of unsaponifiable matter and acid value, were carried out by estimating the coagulation value. The stabilities of various latex were equal, but there was some difference in comparison with that polymerized with Dresinate 214, especially, when sodium sulfate was used as coagulating agent, the difference became larger. Dresinate 214 was inferior than others in stability.