Copolymers comprising (per)fluoropolyether chains
AssigneeSolvay Specialty Polymers Italy S.P.A.
InventorsUgo De Patto, Andrea Lotierzo, Pier Antonio Guarda
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Abstract
The present patent application relates to block copolymers comprising (per)fluoropolyether chains useful as lubricants and characterized by increased viscosity.
Claims18
A block copolymer (P) having two chain ends, wherein both said chain ends comprise a perfluorinated alkyl group, and comprising a first and a second (per)fluoropolyether chain [PFPE chain] each having two chain ends, wherein the first chain end of said first and second PFPE chain comprises a perfluorinated alkyl group and the second chain end of said first and second PFPE chain are bonded to each other via a block of formula (I):
- —
-
- [
- A
-
- —
-
- B
- ]
-
- —
- (
- I
- )
- wherein
- (A) is a PFPE chain, and
- (B) is a moiety complying with the following formula (II):
- wherein
- n is an integer from 1 to 3;
- R1 to R4, each independently, is selected from the group consisting of, fluorine atom, perfluorinated linear or branched alkyl group having from 1 to 6 carbon atoms, group of formula (III):
- -
- (
- R
- 1
-
- 0
- )
- t
- [
- C
-
- (
- R
- 1
-
- 1
- )
-
- (
- R
- 1
-
- 2
- )
- -
- C
-
- (
- R
- 1
-
- 3
- )
-
- (
- R
- 1
-
- 4
- )
-
- (
- R
- 1
-
- 5
- )
- ]
- z
- (
- III
- )
- wherein
- R10 is an oxygen atom, or a bi-/tri-/tetravalent perfluorinated alkyl chain comprising from 1 to 24 carbon atoms, optionally interrupted by and/or comprising at least one oxygen atom,
- t is zero or 1,
- z is an integer from 1 to 3;
- R11 to R15, each independently, is selected from the group consisting of, fluorine atom, perfluorinated linear or branched alkyl group having from 1 to 6 carbon atoms and group of formula (IV):
- -
- [
- (
- A
- ⋀
- )
- a
- -
- (
- B
- ⋀
- )
- v
- ]
- -
- (
- C
- ⋀
- )
- -
- T
- (
- IV
- )
- wherein
- A{circumflex over ( )} is a PFPE chain,
- a is zero or 1,
- v is zero or an integer from 1 to 3,
- B{circumflex over ( )} is a group of formula —[C(R1{circumflex over ( )})(R2{circumflex over ( )})—C(R3{circumflex over ( )})(R4{circumflex over ( )})]—
- wherein R1{circumflex over ( )} to R4{circumflex over ( )} each independently has the meaning defined above for R1 to R4,
- C{circumflex over ( )} is a PFPE chain, and
- T is a perfluorinated alkyl group;
- wherein:
- said A and B in formula (I) and said A{circumflex over ( )} and B{circumflex over ( )} in formula (IV) are statistically distributed,
- at least one of R1 to R4 is a group of formula (III),
- one of R11 or R12 and one of R13 to R15, is a group of formula (IV) wherein a is 1, and
- the sum of (B+B{circumflex over ( )}) is from 1 to 15.
Dependencies are inferred from the claim text.