Substd. polysiloxane-(alpha, omega)-diols prepn. - by hydrolysis of perfluoroalkyl-alkoxyphenyl methyl-dichlorosilane

摘要

Prepn. of poly- perfluoroalkyl(alkoxy)phenyl methyl siloxane -alpha, omega-diols (I), of formula (I) is described. (where RF=OCF3, OCF2F5, OC2F4OCF3 or C3f7;R=CH3 or C6H5; X=1-0.97; y=0-0.03; m=2.3-187.2; and n= 0-3.8. (I) with mol. wt. 620-51,200 are prepd. by hydrolysis of perfluoroalkyl(alkoxy)phenyl methyl dichlorosilanes (II) of formula opt. mixed with methyl(phenyl) vinyl dichlorosilanes of formula R-SiCl2-CH=CH2 (III), at a molar ratio of II:III of 1-0.97 or 0-0.03. Hydrolysis is at 0-25 degrees C, in presence of an acceptor for the HCl formed. I are new cpds. (I) are used for prodn. of sealing compsns., laminates and rubbers. The prods. have high resistance to heat, frost, gasoline and oils. (I) are obtd. in high yield (up to 97%).