Patent ID: 8063003

Claim:
A cyclic phosphazene compound complying with formula (I) or (II): wherein: R f and R′ f , equal to or different from each other and at each occurrence, represent independently, a (per)fluoropolyoxyalkylene chain [chain (OF)] comprising recurring units R o , said recurring units, distributed randomly through the (per)fluoropolyoxyalkylene chain, being chosen among: (i) —CFXO—, wherein X is F or CF 3 , (ii) —CF 2 CFXO—, wherein X is F or CF 3 , (iii) —CF 2 CF 2 CF 2 O—, (iv) —CF 2 CF 2 CF 2 CF 2 O— Z and Z′, equal to or different from each other and at each occurrence, represent a polar group of formula —O − M + , wherein M is chosen among hydrogen, a monovalent metal, an ammonium radical of formula NR 1 R 2 R 3 R 4 , wherein each of R 1 , R 2 , R 3 , R 4 is, independently, an hydrogen atom or a C 1 -C 12 hydrocarbon group, optionally fluorinated, or a polar group of formula —O − ) 2 M′ 2 ′, wherein M′ is a divalent metal [group (P)]; n z is an integer from 1 to 3 n z′ is an integer from 1 to 4; n f′ is an integer such that n z′ +n f′ is equal to 8; and n f is an integer such that n z +n f is equal to 6.