US 11,708,456 B2
(Per)fluoropolyether (PFPE) polymers
Pier Antonio Guarda, Arese (IT); Giovanni Simeone, Solaro (IT); Rosaldo Picozzi, Cesate (IT); and Marco Galimberti, Bollate (IT)
Assigned to SOLVAY SPECIALTY POLYMERS ITALY S.P.A., Bollate (Milano) (IT)
Appl. No. 17/422,474
Filed by SOLVAY SPECIALTY POLYMERS ITALY S.P.A., Bollate (IT)
PCT Filed Feb. 6, 2020, PCT No. PCT/EP2020/052979
§ 371(c)(1), (2) Date Jul. 13, 2021,
PCT Pub. No. WO2020/161233, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 19156266 (EP), filed on Feb. 8, 2019.
Prior Publication US 2022/0081511 A1, Mar. 17, 2022
Int. Cl. C08G 65/00 (2006.01); C08G 65/331 (2006.01); C08G 65/337 (2006.01)
CPC C08G 65/007 (2013.01) [C08G 65/331 (2013.01); C08G 65/337 (2013.01)] 17 Claims
 
1. A perfluoropolyether polymer [polymer (PFPEEST)] comprising a fully fluorinated backbone having two chain ends [chains (EPFPE-EST)] bonded to opposite sides of said backbone,
at least one of said chain (EPFPE-EST) comprising one group of formula —C(═O)X1 with X1 being —OH or an alkoxy chain comprising from 1 to 6 carbon atoms, and the other chain (EPFPE-EST) comprising a group of formula —F, —CF3 or —C(═O)X1 with X1 being as defined above,
and wherein said backbone complies with the following formula:
—(CFX#)z1O(Rf)(CFX*)z2DF*-[O—CF2CF2(CF2)zO—RCF—O(CF2)z*CF2CF2—Rpf-F]t—
wherein:
t is in integer from 1 to 30,
each of z and z* is independently 0 or 1;
z1 is an integer equal to or higher than 1;
z2 is 0 or an integer equal to or higher than 1;
X# and X*, equal or different from each other, are —F or —CF3, provided that when z1 and/or z2 are higher than 1, X# and X* are —F;
DF* is a perfluorinated alkylene chain comprising from 1 to 6 carbon atoms, said alkyl chain being optionally substituted with at least one perfluoroalkyl group comprising from 1 to 3 carbon atom;
RCF is a perfluoro alkyl chain comprising from 2 to 12 carbon atoms, optionally interrupted by one or more oxygen atoms;
(Rf) comprises repeating units R∘, said repeating units being independently selected from the group consisting of:
(i) —CFXO—, wherein X is F or CF3;
(ii) —CFXCFXO—, wherein X, equal or different at each occurrence, is F or CF3, with the proviso that at least one of X is —F;
(iii) —CF2CF2CF2O—;
(iv) —CF2CF2CF2CF2O—;
(v) —(CF2)j—CFZ—O— wherein j is an integer from 0 to 3 and Z is a group of general formula —O—R(f-a)-T, wherein R(f-a) is a fluoropolyoxyalkene chain comprising a number of repeating units from 0 to 10, said recurring units being selected from the group consisting of: —CFXO—, —CF2CFXO—, —CF2CF2CF2O—, —CF2CF2CF2CF2O—, with each of each of X being independently F or CF3 and T being a C1-C3 perfluoroalkyl group;
Rpf-F is a chain of formula:
—O-DF-(CFX#)z1—O(Rf)(CFX*)z2—
wherein
z1, z2, X#, X* and (Rf) are as defined above;
DF is a perfluorinated alkylene chain comprising from 1 to 6 carbon atoms, said alkyl chain being optionally substituted with at least one perfluoroalkyl group comprising from 1 to 3 carbon atoms.