PROCESS FOR OBTAINING METHYLVINYLSILICONE RUBBER

摘要

the invention relates to a process for obtaining rubber metilvinilsiliconic, according to which,copolimerizarea heptametilvinil - ciclotetrasiloxanului is carried out with a mixture of cyclic compounds siloxanici, consisting of 3 5% in weight hexametilciclotirisiloxan, 80...85% by weight octametilciclotetrasiloxan and 13...15% in weight decametilciclopentasiloxan, in the presence of 2% concentrated sulfuric acid, time of 90 min, after which the product is diluted with water in the ratio of 1.2.7% and obeys policondensarii for 18,5h, at temperature not exceeding 35 degree c, preferably 20 degree c.