Patent ID: 6013747
Filing Date: 2000-01-11
Classification: C08F,C08G

Abstract:
In the method of suspension polymerization of fluorinated monomers for preparing fluoropolymers containing hydrogen, the improvement comprising supplying to the reaction mixture a surfactant having the formula:R.sub.f [L--(OCHR.sub.1 --CHR.sub.2).sub.m --OZ].sub.iwhereini is equal to 1 or 2;m is an integer comprised between 4 and 60;L is selected from the group consisting of --(CFY--CO--O).sub.p R'-- and --(CFY--CO--NH).sub.p R'--wherein p is an integer equal to 0 or 1;Y is F or CF.sub.3 ; R' is a C.sub.1 -C.sub.5 alkyl radical, linear or branched;R.sub.1 and R.sub.2 can both be H or R.sub.1 can be H and R.sub.2 CH.sub.3 ;Z can be H, a C.sub.1 -C.sub.3 alkyl radical, linear of branched, or (CH.sub.2).sub.n OH with n an integer from 1 to 6;R.sub.f is a perfluoroalkyl radical or a perfluoropolyether radical having a number average molecular weight comprised between 250 and 1500.