(Per)fluoropolyether polymers and use thereof

A composition [composition (INT)] comprising:

• a (per)fluoropolyether polymer [polymer (PINT)] comprising a (per)fluoropolyether chain [chain (Rpf)] having two chain ends bonded to opposite sides of said chain (Rpf), wherein one chain end comprises at least one group comprising at least one quaternary ammonium salt group [group (N+)] and the other chain end comprises at least one-OH group;
• a (per)fluoropolyether polymer [polymer (PN)] comprising a (per)fluoropolyether chain [chain (Rpf)] having two chain ends bonded to opposite sides of said chain (Rpf), wherein both chain ends comprise at least one group (N+);
• and
• a (per)fluoropolyether (PFPE) polymer comprising a (per)fluoropolyether chain [chain (Rpf)] having two chain ends bonded to opposite sides of said chain (Rpf), both said chain ends comprising at least one-OH group;
• wherein said composition (CINT) comprises:
• from 5 to 50 wt. % of said polymer (PINT);
• from 0.01 to 15 wt. % of said polymer (PN);
• and
• from 35 to 94.99 wt. % of said (per)fluoropolyether (PFPE);
• the amounts being based on 100 wt. % of said composition (CPOL).

A (per)fluoropolyether polymer [polymer (PP)] comprising a (per)fluoropolyether chain [chain (Rpf)] having two chain ends bonded to opposite sides of said chain (Rpf), wherein one chain end comprises at least one group comprising at least one quaternary ammonium salt group [group (N+)] and the other chain end comprises at least one group selected from the group consisting of:

• alkoxysilane [group (Si)], and a cross-linkable group;
• wherein said group (N) is selected from groups having formula (N+-I):
• -N+(Rh1)(Rh2)(Rh3) (N+-I)
• wherein
• each of Rh1, Rh2, and Rh3 is independently selected from linear or branched alkyl chain having from 1 to 20 carbon atoms, benzyl or at least two of Rh1, Rh2, and Rh3 together with the nitrogen atom form a 5- or 6-membered aliphatic ring or Rh1, Rh2, and Rh3 together with the nitrogen atom form a 5- or 6-membered aromatic ring;
• wherein said cross-linkable group is an unsaturated moiety group (U), wherein group (U) is selected from the group consisting of:
• —O—C(—O)—CRH═CH2 (U-I)
• —O—C(═O)—NH—CO—CRH—CH2 (U-II)
• —O—C(═O)—RA—CRH═CH2 (U-III)
• wherein
• RH is H or a C1-C6 alkyl group;
• RA is selected from the group consisting of (RA-I) and (RA-II):
• wherein
• each of j5 is independently 0 or 1 and
• RB is a divalent, trivalent or tetravalent group selected from the group consisting of C1-C10 aliphatic group;
• C3-C12 cycloaliphatic group;
• C5-C14 aromatic or alkylaromatic group, optionally comprising at least one heteroatom selected from N, O and S;
• wherein
• j6 is 0 or 1;
• each of j7 is independently 0 or 1;
• RB′ is a divalent, trivalent or tetravalent group selected from the group consisting of C1-C10 aliphatic group;
• C3-C12 cycloaliphatic group;
• C5-C14 aromatic or alkylaromatic group, optionally comprising at least one heteroatom selected from N, O and S;
• and
• RB* has the same meanings as RB′ or it is a group of formula (RB-I):
• wherein
• substituent U is selected from the groups (U-I) to (U-III)
• and
• * and # indicate the bonding site to the nitrogen atoms in formula (RA-II);
• and
• wherein said group (U) is bonded to one chain end of said chain (Rpf) via group of formula:
• *—R10—NH—C(═O)—O—R11-#
• wherein
• * indicate the bond to group (U);
• # indicate the bond to chain (Rpf);
• R10 is a linear or branched alkyl chain having from 1 to 6 carbon atoms, optionally substituted with a group comprising a tri-alkoxy-silyl group;
• R11 is a sigma bond or a poly(oxy)alkylene chain [chain (Ra{circumflex over ( )})], wherein said chain (Ra{circumflex over ( )}) comprises from 1 to 50 fluorine-free oxyalkylene units, said units being the same or different each other and being selected from
• —CH(J*)CH(J)-O,
• wherein each of J and J* is independently selected from hydrogen atom, straight or branched alkyl or aryl.