Fluorinated polyacrylates and polyacrylamides having a controlled cross-linking degree, and process for preparing same

Claim 1

An acrylic or methacrylic polymer, having a controlled cross-linking degree, prepared by radicalic polymerization of a monomer mixture comprising: a) from 1% to 99% moles of a monomer of the monoacrylate or monoacrylamide type, consisting of a perfluoropolyoxyalkylene chain and having one of the following general formulas: wherein: m, n and g are integers from 0 to 50, and m+n+q is not lower than 2, the oxy-fluoroalkylene unites being statistically distributed along the chain; A is a perfluoroalkyl end groups of the type Z is -CX(Y)O-(CH 2 -CH 2 O) p -or -CH 2 NR'-; X is a hydrogen atom or a fluorine atom; Y is CF 3 or it may be also H if also X is H; R and R', like or different from each other, may be H or CH 3 ; p=0-3; wherein Z and R have the above defined meanings and r is an integer of at least 2; wherein s is an integer comprised between 1 and 50 and Z and R have the meanings above defined. b) from 99% to 1% by moles of a monomer of the diacrylate or diacrylamide type, consisting of a perfluoropolyoxyalkylene chain and having one of the following general formulas: in which the units -C 2 F 4 O-and -CF 2 O-are statistically distributed along the chain, Z and R being the same as defined hereinbefore, and m and n being integers from 1 to 50; wherein r , s and t are integers from 1 to 50 and Z and R have the meanings as above defined; b.3) CH 2 =CR-CO-Z-CF 2 CH 2 (OCF 2 CF 2 CH 2 ) S -OR' i -O-(CH 2 CF 2 CF 2 O) v CH 2 CF 2 -CO-CR=CH 2 wherein s and v are integers from 1 to 50 and Z and R have the meanings as above defined, R' f being a perfluoroalkylene radical of 1-6 carbon atoms.