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Elastic emulsion gels with high three dimensional cross-links were prepared by the emulsion polymerization of n-butyl acrylate and divinylbenzene as cross-linking agents. Furthermore, concidering the vulcanization of synthetic rubbers, an allyl methacrylate was used as the third component. Emulsion gels obtained showed that the avrage particle sizes are about 0.1μm and particle size distributions are very narrow. By quantitative analysis of ethylenic double bonds in the surface layer of gels, it was found that they are proportinal to molar ratio of divinylbenzene. Rubber blends were prepared by the co-precipitation of the mixture of FKM latex and these emulsions.From the results of vulcanization curves, it was found that the rate of vulcanization did not appreciably changed and the values of final torque increased with increasing the blend ratio and the molar ratio of DVB. The moduli and tensile strngths of blend vulcanizates increased with increasing the amount and the cross-linking density of gels, but the elongations decreased. On the other hand, in the case of blending gels with allyl groups, moduli were appreciably unchanged but TB s were more improved than the FKM vulcanizate as a control. The decrease of the benzene swelling resistance was a little.

Improvement in Properties of Rubbers by Latex Blend(1). Synthesis of Functional Elastic Gels and Blend with FKM Latex.