| abstract |
Cosiloxanes of formula I: (CF DRAWING IN BOPI) where V = -SiRa Rb O-; W = -SiR'a, (Rc -Rd -PhCH = CH2) O; Y = -SiRa Re O-; Z = -Ra Re SiCn, H2 n R'f Cn, H2 n SiRa Re O- where n = 2, 3 or 4; Ra and Rb = alkyl or phenyl; R'a = Ra or -OCH3 or OC2 H5; Rc = -C2 H4 -, -C3 H6 -, -C2 H4 -S-C2 H4 -, - C3 H6 -S-C2 H4, -C3 H6 OC2 H4 - or -C2 H4 OC2 H4 -; Rd = -O (CH2) p -; Re = -Ck H2 k -Rf or -Ck H2 k -Ra; Rf is a perfluoroalkyl group or a monovalent radical of an oligomer of oxetanes or fluorinated oxiranes; R ′ f is a perfluoroalkylene, alpha, omega-fluoralkenyl group, or a divalent telechelic radical of an oligomer derived from oxetanes or fluorinated oxiranes, or an m-phenylene di (hexafluoroisopropoxy) radical. |