WO2024068677A1 - Perfluoropolyether polymers - Google Patents
Perfluoropolyether polymers Download PDFInfo
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- WO2024068677A1 WO2024068677A1 PCT/EP2023/076612 EP2023076612W WO2024068677A1 WO 2024068677 A1 WO2024068677 A1 WO 2024068677A1 EP 2023076612 W EP2023076612 W EP 2023076612W WO 2024068677 A1 WO2024068677 A1 WO 2024068677A1
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- 239000010702 perfluoropolyether Substances 0.000 title claims description 34
- 229920000642 polymer Polymers 0.000 title claims description 20
- 229920001577 copolymer Polymers 0.000 claims abstract description 110
- 125000000524 functional group Chemical group 0.000 claims abstract description 16
- 125000004432 carbon atom Chemical group C* 0.000 claims description 79
- 125000000217 alkyl group Chemical group 0.000 claims description 56
- 150000001875 compounds Chemical class 0.000 claims description 48
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 40
- 125000000864 peroxy group Chemical group O(O*)* 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 27
- 125000005010 perfluoroalkyl group Chemical group 0.000 claims description 20
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 19
- 125000001153 fluoro group Chemical group F* 0.000 claims description 16
- 150000001336 alkenes Chemical class 0.000 claims description 15
- 229910052731 fluorine Inorganic materials 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 14
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 10
- 229910006095 SO2F Inorganic materials 0.000 claims description 9
- 229920001400 block copolymer Polymers 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- -1 perfluoro-2- propoxypropyl group Chemical group 0.000 claims description 9
- MHNPWFZIRJMRKC-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical compound F[C]=C(F)F MHNPWFZIRJMRKC-UHFFFAOYSA-N 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 7
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 5
- 125000003709 fluoroalkyl group Chemical group 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- HFNSTEOEZJBXIF-UHFFFAOYSA-N 2,2,4,5-tetrafluoro-1,3-dioxole Chemical class FC1=C(F)OC(F)(F)O1 HFNSTEOEZJBXIF-UHFFFAOYSA-N 0.000 claims description 4
- 150000001767 cationic compounds Chemical class 0.000 claims description 4
- 150000001768 cations Chemical class 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 4
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 claims description 4
- 125000005843 halogen group Chemical group 0.000 claims description 4
- 229910001411 inorganic cation Inorganic materials 0.000 claims description 4
- 150000002892 organic cations Chemical class 0.000 claims description 4
- 125000006340 pentafluoro ethyl group Chemical group FC(F)(F)C(F)(F)* 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 238000007669 thermal treatment Methods 0.000 claims description 4
- 125000000876 trifluoromethoxy group Chemical group FC(F)(F)O* 0.000 claims description 4
- 229910006069 SO3H Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 125000005842 heteroatom Chemical group 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- BLTXWCKMNMYXEA-UHFFFAOYSA-N 1,1,2-trifluoro-2-(trifluoromethoxy)ethene Chemical compound FC(F)=C(F)OC(F)(F)F BLTXWCKMNMYXEA-UHFFFAOYSA-N 0.000 description 15
- 239000003921 oil Substances 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000000178 monomer Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 238000004293 19F NMR spectroscopy Methods 0.000 description 5
- 238000005481 NMR spectroscopy Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000002199 base oil Substances 0.000 description 4
- 238000010348 incorporation Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000004448 titration Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 125000002081 peroxide group Chemical group 0.000 description 3
- 150000002978 peroxides Chemical class 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 125000004169 (C1-C6) alkyl group Chemical group 0.000 description 2
- VQUGQIYAVYQSAB-UHFFFAOYSA-N 1,1,2,2-tetrafluoro-2-(1,2,2-trifluoroethenoxy)ethanesulfonyl fluoride Chemical compound FC(F)=C(F)OC(F)(F)C(F)(F)S(F)(=O)=O VQUGQIYAVYQSAB-UHFFFAOYSA-N 0.000 description 2
- LGPPATCNSOSOQH-UHFFFAOYSA-N 1,1,2,3,4,4-hexafluorobuta-1,3-diene Chemical compound FC(F)=C(F)C(F)=C(F)F LGPPATCNSOSOQH-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- OBTWBSRJZRCYQV-UHFFFAOYSA-N sulfuryl difluoride Chemical group FS(F)(=O)=O OBTWBSRJZRCYQV-UHFFFAOYSA-N 0.000 description 2
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 150000001265 acyl fluorides Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000012668 chain scission Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000000806 fluorine-19 nuclear magnetic resonance spectrum Methods 0.000 description 1
- UQSQSQZYBQSBJZ-UHFFFAOYSA-M fluorosulfate group Chemical group S(=O)(=O)([O-])F UQSQSQZYBQSBJZ-UHFFFAOYSA-M 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 125000001188 haloalkyl group Chemical group 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000269 nucleophilic effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 239000012048 reactive intermediate Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/002—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds
- C08G65/005—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds containing halogens
- C08G65/007—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from unsaturated compounds containing halogens containing fluorine
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
- C08F214/262—Tetrafluoroethene with fluorinated vinyl ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
- C08G65/33365—Polymers modified by chemical after-treatment with organic compounds containing nitrogen containing cyano group
- C08G65/33368—Polymers modified by chemical after-treatment with organic compounds containing nitrogen containing cyano group acyclic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2650/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G2650/28—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type
- C08G2650/46—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing halogen
- C08G2650/48—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterised by the polymer type containing halogen containing fluorine, e.g. perfluropolyethers
Definitions
- Example 4 discloses the reaction with perfluoro butadiene, with a large excess of perfluorinated bis-olefin, resulting in pendant unsaturated groups along the macromolecular chain such that the reaction can further proceed in the presence of hexamethylenediamine.
- US 6,403,539 discloses perfluoro-polyether polymers containing sulphonyl fluoride groups pending along the backbone.
- This patent application discloses a process wherein the sulphonyl fluoride-containing monomer is contemporaneously fed with an O 2 flow in a liquid reaction medium, thus obtaining perfluoropolyethers containing in the chain peroxidic groups.
- the presence of the peroxidic groups is not desired for safety concerns.
- this patent application discloses that to obtain non peroxidic products without chain scission, the peroxidic perfluoropolyethers are subjected to a thermal treatment at temperatures generally in the range from 150°C to 250°C or to a photochemical treatment, optionally in the presence of a solvent.
- the process herein disclosed – in which the functionalized monomer is added at the beginning of the polymerization - does not allow the synthesis of a polymer having segregated blocks from the functionalized monomer but rather it allows for the synthesis of a PFPE polymer having randomly distributed functional groups.
- Polyfunctional (per)fluoropolyether polymers have been further disclosed in US 5,719,259 (E.I.
- US 2011/0230631 (Solvay Solexis S.p.A, September 22, 2011) discloses (per)fluoropolyethers comprising at least one (per)fluoropolyoxyalkylene chain comprising at least one recurring unit of formula -CF 2 -CF(CF 2 O-SO 2 F)-O-, wherein fluorosulfate group in brackets is a pendant group, which is subsequently reacted with a nucleophilic agent to provide functional groups, such as notably carboxylic acid, acyl fluoride, amide and esters.
- functional groups such as notably carboxylic acid, acyl fluoride, amide and esters.
- CN 103724559 discloses a method comprising placing the perfluoropolyether peroxide prepared by a photo-oxidation method in an inert fluorine-containing solvent, introducing perfluoro-olefin under an ultraviolet irradiation condition, and reacting the perfluoro-olefin with the peroxide to form a stable perfluoropolyether compound.
- WO 2019/048394 Solvay Specialty Polymers Italy S.p.A., March 14, 2019 discloses polyfunctional perfluoropolyether derivatives including a plurality of ionisable groups selected from the group consisting of -SO3Xa, -PO3Xa and – COOXa, wherein Xa is H, ammonium group or a monovalent metal.
- Xa is H, ammonium group or a monovalent metal.
- the Applicant developed new co-polymers comprising (per)fluoropolyether chains and (per)fluorinated co-monomers, whose properties - for example with respect to their viscosity and/or physical appearance - can be properly tuned based on their intended final use.
- the Applicant faced the problem of preparing new co-polymers comprising (per)fluoropolyether chains characterised by increased viscosity (as measured by complex viscosity at 0.1 rad/s at 25°C).
- the new copolymers according to the present invention show a low glass transition temperature (T g ) and are in the liquid state at room temperature.
- T g glass transition temperature
- the new copolymers according to the present invention can be provided in a solid form, such as in particular as rubbers, or in a semi-solid form.
- the Applicant developed new copolymers comprising functional groups, which can be advantageously introduced as pendant groups along the main backbone of the PFPE copolymers to make them suitable for use as SSPI 2022/021 additives in different technical fields, including as anti-rust, anti-wear, to increase compatibility among base oils and thickeners and other ingredients dispersed in such base oils.
- copolymer (P) according to the invention can be provided in liquid form or in semi-solid form. However, when required by the final use, copolymer (P) can also be provided in the form of solid, such as a rubber.
- copolymer (P) is characterised by a complex viscosity, measured at 0.1 rad/s and at 25°C, varying in a large range, such as from 10 Pa*s to more than 2000 Pa*s.
- said first chain end of said first and second PFPE chain correspond to the two chain ends of copolymer (P).
- each of said PFPE chain is a fully fluorinated chain [chain (Rf)] comprising, preferably consists of, 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) -CF 2 CF 2 CF 2 O-; (v) -(CF 2 ) 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
- chain (Rf) complies with the following formula: (Rf-I) -[(CFX 1 O) g1 (CFX 2 CFX 3 O) g2 (CF 2 CF 2 CF 2 O) g3 (CF 2 CF 2 CF 2 O) g4 ]- wherein - X 1 is independently selected from -F and -CF3, SSPI 2022/021 - X 2 , X 3 , equal or different from each other and at each occurrence, are independently -F, -CF3, with the proviso that at least one of X is -F; - g1, g2 , g3, and g4, equal or different from each other, are independently integers ⁇ 0, such that g1+g2+g3+g4 is in the range from 2 to 300, preferably from 2 to 100; should at least two of g1, g2, g3 and g4 be different from zero, the different recurring units are
- chain (R f ) is selected from chains of formula: (Rf-IIA) -[(CF2CF2O)a1(CF2O)a2]- wherein: - a1 and a2 are independently integers ⁇ 0 such that the number average molecular weight is between 400 and 100,000 as determined via NMR, preferably between 400 and 50,000; both a1 and a2 are preferably different from zero, with the ratio a1/a2 being preferably comprised between 0.1 and 10; (Rf-IIB) -[(CF2CF2O)b1(CF2O)b2(CF(CF3)O)b3(CF2CF(CF3)O)b4]- wherein: b1, b2, b3, b4, are independently integers ⁇ 0 such that the number average molecular weight is between 400 and 100,000 as determined via NMR, preferably between 400 and 50,000; preferably each of b1, b2, b3, b4 are > 0; (Rf-IIA)
- chain (R f ) complies with formula (R f -III) here below: (R f -III) -[(CF 2 CF 2 O) a1 (CF 2 O) a2 ]- wherein: - a1, and a2 are integers > 0 such that the number average molecular weight is between 400 and 100,000 as determined via NMR, preferably between 400 and 50,000, with the ratio a1/a2 being generally between 0.1 and 10, more preferably between 0.2 and 5.
- at least one of L ⁇ and L is different from 0.
- both L ⁇ and L are different from 0.
- R 100 , R 101 , R 102 and R 103 are a halogen atom, such as fluorine atom or chlorine atom.
- m is 0 or an integer from 1 to 2.
- one of R 5 to R 8 is a group of formula (V).
- R20 is a sigma bond or a group selected from those of formula (R20-i) to (R20-iv) as defined hereinafter: (R 20 -i) -(CF2)s1-O-(CF2)s2- wherein each of s1 and s2 is independently an integer from 1 to 6, preferably from 1 to 3; (R20-ii) -O-(CF 2 ) s3 - wherein s3 is an integer from 1 to 6, preferably from 1 to 5; (R20-iii) -O-R 400 -O-R 401 - wherein R400 is a linear or branched perfluorinated alkyl chain comprising from 1 to 6, preferably from 1 to 3, carbon atoms, and more preferably complying with formula -CF2-, -CF2CF2-, -CF2CF2CF2-, -CF2CF(CF3)-; and R401 is a linear or branched perfluorinated alkyl chain comprising from 1 to 6, preferably
- the process according to the present invention can be easily scaled up from laboratory scale to pilot and industrial scale.
- copolymer (P) of the present invention is prepared via process (P) comprising at least the following steps
- An advantage of the process for the manufacture of copolymer (P) according to the present invention is that the amounts of the reactants providing each of block (1), block (2) and block (3) can be tuned and selected a priori based on the desired properties of the final copolymer (P). This is advantageous as selecting a priori the amount of the reactants allows to tune the number of each block (1), block (2) and block (3) in copolymer (P).
- step (a) the order in which the reactants are added is not limited. Accordingly, the PFPE peroxy, the compound of formula (X-p), the compound of formula (XX- p) and the compound (O) can be supplied to the reaction environment in any order.
- the PFPE peroxy can be subjected to partial reduction of the peroxide bonds, for example by chemical reduction or UV treatment or thermal treatment.
- chain (Rf) comprising, preferably consisting of, repeating units (R°) being independently selected from the group consisting of formulae (i)
- step (a) of the process of the present invention is performed with at least one compound (O).
- said at least one compound (O) is selected in the group comprising, preferably consisting of: (i) fully halogenated olefin comprising from 2 to 10 carbon atoms, preferably from 2 to 8 carbon atoms.
- each of R21, R22 and R23 is -F.
- SSPI 2022/021 R 20 is a sigma bond or a group selected from those of formula (R20-i) to (R20-iv) as defined hereinafter: (R20-i) -(CF2)s1-O-(CF2)s2- wherein each of s1 and s2 is independently an integer from 1 to 6, preferably from 1 to 3; (R 20 -ii) -O-(CF2)s3- wherein s3 is an integer from 1 to 6, preferably from 1 to 5; (R 20 -iii) -O-R400-O-R401- wherein R400 is a linear or branched perfluorinated alkyl chain comprising from 1 to 6, preferably from 1 to 3, carbon atoms, and more preferably complying with formula -CF 2 -
- the amount of each of said at least one compound (X-p), compound (XX-p) and compound (O) is not limited. As explained above, the amount of each of the above mentioned compounds can advantageously be selected based on both the amount of the PFPE peroxy, as well as its peroxidic content, and the properties desired in the final copolymer (P). [0054] For example, the equivalents of double bonds of said compound (X-p) to the equivalents of peroxidic groups preferably range from 1:100 to 5000:100. Also, the equivalents of double bonds of said compound (XX-p) to the equivalents of peroxidic groups preferably range from 1:100 to 100:100.
- Step (a) of process (P) can be advantageously performed by contacting said PFPE peroxy with one compound of formula (X-p).
- said step (a) can be performed by contacting said PFPE peroxy with two or more compounds of formula (X-p).
- Step (a) of process (P) can be advantageously performed by contacting said PFPE peroxy with one compound of formula (XX-p).
- said step (a) can be performed by contacting said PFPE peroxy with two or more compounds of formula (XX-p).
- Step (a) and step (b) can be performed in the presence of a fluorinated solvent.
- said fluorinated solvent is selected in the group comprising: perfluorocarbons, hydrofluorocarbons, perfluoropolyethers, hydrofluoro- polyethers.
- step (b) is performed in the presence of UV radiation for a time from 2 to 150 hours, more preferably from 5 to 100 hours.
- step (b) is performed in the presence of UV radiation at a temperature from -60°C to +150°C, more preferably from -20°C to +100°C and even more preferably from 0°C to 60°C.
- step (b) can be performed under thermal treatment, preferably by heating at a temperature from 150 °C to 250 °C.
- step (b) is performed in an inert atmosphere.
- the present invention relates to copolymer (P) obtained via process (P) as described above.
- the functional groups introduced as pendant groups in block (3) of copolymer (P), such as notably -SO2F, -SO3H, -COOH, -COF, -CN, -Br and - CONH 2 , as well as the functional groups at the chain ends of copolymer (P), such as notably -COF and -OC(O)F, can be properly reacted to obtain other different functional groups.
- copolymer (PF) according to the present invention is obtained from process (P) as described above, which further comprises after said step (b) , at least one step (c) comprising at least one of salification, hydrolyzation, oxidation, reduction or another chemical reaction capable of providing functional group(s) of interest.
- the present invention further encompasses copolymer (PF) obtained at the end of step (c) of process (P).
- PFPE chain perfluoropolyether chain
- each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -COOH and salts thereof with an organic cation, preferably onium cation, more preferably ammonium, or an inorganic cation, preferably an alkaline metal, more preferably Na + , K + ; -COOR wherein R is a linear or branched alkyl chain comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atom
- the present invention relates to a mixture [mixture (PF)] comprising two or more copolymers (P F ) as defined above.
- mixtures of copolymers (P) or copolymers (PF) according to the present invention are typically obtained.
- the present invention relates to a mixture [mixture (P)] comprising two or more copolymers (P) as defined above.
- mixture (P) is obtained via process (P) as described above.
- said mixture (P) can be subjected to one or more purification steps (also referred to as “fractionation” steps), thus obtaining separate copolymers (P) characterised by different viscosities and/or number average molecular weights as measured by 19 F-NMR and/or functionality (F), preferably from 3 to 102.
- Said mixtures can further contain the PFPE peroxy used as starting material and/or mixtures of copolymers (P) containing peroxy groups [copolymer (P O-O )] and/or mixtures of copolymers (P F ) containing peroxy groups [copolymers (P F-O-O )] can be obtained.
- the present invention related to a mixture [mixture (M1)] comprising at least one copolymer (P) as defined above, and at least one of said PFPE peroxy used as starting material and/or one or more of copolymers (PO-O).
- M1 a mixture [mixture (M2)] comprising at least one copolymer (PF) as defined above, and at least one of at least one of copolymer (P) as defined above, said PFPE peroxy used as starting material, said one or more copolymers (P O-O ), and/or said one or more copolymers (PF-O-O).
- copolymer (PO-O) and/or copolymer (PF-O-O) can be isolated and used as intermediate in other processes.
- amount of peroxy groups that can be present in the mixture containing copolymer (P) or copolymer (PF) of the present invention can be up to 99% based on the amount of the starting peroxy groups in the PFPE peroxy, depending on the final application the amount of said peroxy groups can be properly adjusted for example up to 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5%.
- Copolymer (P) and/or copolymer (P F ) according to the present invention can be used for different applications in several industries, wherein outstanding resistance and durability at high temperature and harsh environments is required.
- copolymer (P) and/or copolymer (PF) can be used as base oils as lubricants.
- copolymer (P) and/or copolymer (PF) can be used as additives in halogenated oils and/or greases.
- copolymers according to the present invention are in the liquid state at room temperature, or even at temperatures lower than room temperature, with advantages in handling and storage of the copolymers.
- copolymer (P) is in the liquid state at room temperature.
- copolymer (P F ) is in the liquid state at room temperature.
- each of copolymer (PO-O) and copolymer (PF-O-O) as well as each of mixture (M1) and mixture (M2) is in the liquid state at room temperature.
- Example 1 - PFPE copolymer with VEFS, TFE, PMVE and PBVE 250.3 g of the peroxidic perfluoropolyether oil described above were charged in a 1500 mL stirred cylindrical photochemical reactor equipped with a high pressure mercury lamp model HANAU TQ150, a thermocouple, a condenser and a mechanical stirrer. [00102] The oil was diluted with 1876 g of Galden(R) HT200 and then 23.0 g of VEFS and 1.1 g of PBVE were added to the reactor.
- Example 2 – PFPE copolymers with 8CNVE, PBVE, TFE and PMVE 251.8 g of the peroxidic perfluoropolyether oil described above were charged in the same reactor as Example 1. The oil was diluted with 1873 g of Galden(R) D100. Next, 29.2 g of 8CNVE and 2.5 g of PBVE were added to the reactor. [00111] The mixture was then purged with nitrogen under stirring, after which two fluorinated olefins, PMVE and TFE, were introduced into the reactor, at a rate of 17.1 and 9.3 g/h, respectively. After the flow started, the UV lamp was switched on and the reaction was conducted at 20°C for 6h.
- the introduction of the -CN functional groups was also confirmed by FT-IR spectroscopy measurements, confirming the presence of the peak at 2269 cm -1 .
- Comparative Example 1 - PFPE copolymers with VEFS, TFE and PMVE 251 g of the peroxidic perfluoropolyether oil described above were charged in a the same reactor as Example 1.
- the oil was diluted with 1876 g of a SSPI 2022/021 perfluorinated solvent, Galden(R) HT200, and 14.0 g of VEFS were added to the reactor. [00119] The mixture was then purged with nitrogen under stirring, after which two fluorinated olefins, PMVE and TFE, were introduced into the reactor, at a rate of 14.6 and 8.0 g/h, respectively. After the flow started, the UV lamp was switched on and the reaction was conducted at 20°C for 7h.
- the oil was diluted with 1875 g of a perfluorinated solvent, Galden(R) D100, and 29.2 g of 8CNVE were added to the reactor. [00126] The mixture was then purged with nitrogen under stirring, after which two fluorinated olefins, PMVE and TFE, were introduced into the reactor, at a rate of 17.1 and 9.3 g/h, respectively. After the flow started, the UV lamp was switched on and the reaction was conducted at 20°C for 6h. After this time the olefin flows were interrupted and the UV lamp was kept on for further 35 hours at 20°C.
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Abstract
The present invention relates to new copolymers comprising (per)fluoropolyether chains and functional groups.
Description
SSPI 2022/021 Description Perfluoropolyether polymers Cross reference to related patent applications [0001] This patent application claims priority filed on 28 September 2022 in Europe with Nr 22198270.5, the whole content of this application being incorporated herein by reference for all purposes. Technical field [0002] The present invention relates to new copolymers comprising (per)fluoropolyether chains and functional groups. Background Art [0003] (Per)fluoropolyether polymers (in the following referred to as “PFPE polymers”) have been long known as base oils or as additives in several lubricant applications. [0004] Several syntheses of PFPE polymers have been disclosed in the art. The first synthesis of unspecified perfluorinated polyether mixtures was reported in 1953, when an oily product was obtained in the course of photoligomerization of hexafluoropropene. Since then, a number of different perfluorinated polyethers have been synthesised and described in literature. [0005] US 4500739 (in the name of Montedison) discloses the reaction of a peroxidic PFPE with - among the others - perfluoro butadiene (Group II of fluoroolefins). Example 4 discloses the reaction with perfluoro butadiene, with a large excess of perfluorinated bis-olefin, resulting in pendant unsaturated groups along the macromolecular chain such that the reaction can further proceed in the presence of hexamethylenediamine. [0006] US 8,258,090 (in the name of Solvay Solexis S.p.A.) discloses fluorinated lubricants of formula: (I) T-O-[A-B]z-[A’-B’]z’-A-T wherein T and T’ are C1-3 perfluoroalkyl or C1-6 alkyl, A and A are a perfluoropolyether chain, B derives from two different olefins, of which at least one homopolymerizable by radical route, of formula: (Ia) -[(CR1R2-CR3R4)j-(CR5R6-CR7R8)j’]- wherein j is from 1 to 5, j’ is from 0 to 4 and the sum of j+j’ is between 2 and 5; R1 to R8 are halogen, H, C1-6 (per)haloalkyl, C1-6 alkyl, C1-6 oxy(per)fluoroalkyl; z is higher than or equal to 2, z’ is an integer and the sum of z and z’ is such that the number average molecular weight of the polymer of formula (I) is in the range 500-500000; B’ is (Ia) but at least one of R1 to R8 has a meaning different from that in B. [0007] This patent discloses block copolymers characterised by a linear backbone, without any branching. Indeed, no branching is obtained within B, notably comprising (per)fluoropolyether chains. [0008] PFPE polymers comprising functional groups along the backbone have been disclosed in the art, being useful as reactive intermediate compounds and as additives.
SSPI 2022/021 [0009] Perfluoropolyether polymers obtained from the reaction of polyperoxidic perfluoropolyether and fluorinated olefin in the presence of U.V. radiation have been disclosed in US 4,500,739 (Montedison S.p.A., February 19, 1985). [0010] US 6,403,539 (Ausimont S.p.A., June 11, 2002) discloses perfluoro-polyether polymers containing sulphonyl fluoride groups pending along the backbone. This patent application discloses a process wherein the sulphonyl fluoride-containing monomer is contemporaneously fed with an O2 flow in a liquid reaction medium, thus obtaining perfluoropolyethers containing in the chain peroxidic groups. However, the presence of the peroxidic groups is not desired for safety concerns. Hence, this patent application discloses that to obtain non peroxidic products without chain scission, the peroxidic perfluoropolyethers are subjected to a thermal treatment at temperatures generally in the range from 150°C to 250°C or to a photochemical treatment, optionally in the presence of a solvent. The process herein disclosed – in which the functionalized monomer is added at the beginning of the polymerization - does not allow the synthesis of a polymer having segregated blocks from the functionalized monomer but rather it allows for the synthesis of a PFPE polymer having randomly distributed functional groups. [0011] Polyfunctional (per)fluoropolyether polymers have been further disclosed in US 5,719,259 (E.I. DuPont de Nemours and Company, February 17, 1998), US 4,853,097 (Ausimont S.r.l., August 1, 1989), US 5,104,911 (Ausimont S.r.l., April 14, 1992). [0012] US 2011/0230631 (Solvay Solexis S.p.A, September 22, 2011) discloses (per)fluoropolyethers comprising at least one (per)fluoropolyoxyalkylene chain comprising at least one recurring unit of formula -CF2-CF(CF2O-SO2F)-O-, wherein fluorosulfate group in brackets is a pendant group, which is subsequently reacted with a nucleophilic agent to provide functional groups, such as notably carboxylic acid, acyl fluoride, amide and esters. [0013] CN 103724559 (ZHONGHAO CHENGUANG RES INST CHEMICAL IND, April 16, 2014) discloses a method comprising placing the perfluoropolyether peroxide prepared by a photo-oxidation method in an inert fluorine-containing solvent, introducing perfluoro-olefin under an ultraviolet irradiation condition, and reacting the perfluoro-olefin with the peroxide to form a stable perfluoropolyether compound. [0014] WO 2019/048394 (Solvay Specialty Polymers Italy S.p.A., March 14, 2019) discloses polyfunctional perfluoropolyether derivatives including a plurality of ionisable groups selected from the group consisting of -SO3Xa, -PO3Xa and – COOXa, wherein Xa is H, ammonium group or a monovalent metal. Summary of invention [0015] The Applicant developed new co-polymers comprising (per)fluoropolyether chains and (per)fluorinated co-monomers, whose properties - for example with respect to their viscosity and/or physical appearance - can be properly tuned based on their intended final use. [0016] More in particular, the Applicant faced the problem of preparing new co-polymers comprising (per)fluoropolyether chains characterised by increased viscosity (as measured by complex viscosity at 0.1 rad/s at 25°C). [0017] According to an embodiment, the new copolymers according to the present invention show a low glass transition temperature (Tg) and are in the liquid state at room temperature. However, if desired, the new copolymers according to the present invention can be provided in a solid form, such as in particular as rubbers, or in a semi-solid form. [0018] Furthermore, the Applicant developed new copolymers comprising functional groups, which can be advantageously introduced as pendant groups along the main backbone of the PFPE copolymers to make them suitable for use as
SSPI 2022/021 additives in different technical fields, including as anti-rust, anti-wear, to increase compatibility among base oils and thickeners and other ingredients dispersed in such base oils. Detailed description of the invention [0019] For the purpose of the present description and of the following claims: - the use of parentheses around symbols or numbers identifying the formulae, for example in expressions like “polymer (P)”, etc., has the mere purpose of better distinguishing the symbol or number from the rest of the text and, hence, said parenthesis can also be omitted; - the acronym “PFPE” stands for "perfluoropolyether” and, when used as substantive, is intended to mean either the singular or the plural form, depending on the context; - the term “functionality (F)” is intended to indicate the amount of functional groups in the copolymer according to the present invention as measured via NMR or titration. [0020] In a first aspect, the present invention relates to a block copolymer [copolymer (P)] comprising a first and a second perfluoropolyether chain [PFPE chain] each having two chain ends, wherein the first chain end of each one of said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -C(=O)F and -OC(=O)F, and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I): -[CR100R101-CR102R103]L^-(D)L- (I) wherein L^ is 0 or an integer from 1 to 250; R100, R101, R102 and R103 are each independently selected from halogen atom, more preferably fluorine or chlorine atom; linear or branched alkyl chain comprising from 1 to 6 carbon atoms; -OR200 wherein R200 is a linear or branched perfluorinated chain comprising from 1 to 6 carbon atoms or a group of formula - CF2OR201 in which R201 is a perfluorinated alkyl chain comprising from 1 to 6 carbon atoms, optionally interrupted by one or more oxygen ether atoms; or one of R100 and R101 and one of R102 and R103 are a fluorine atom and the other of R100 and R101 and the other of R102 and R103 together form a perhalogenated cyclic ring having from 4 to 6 members, optionally comprising heteroatoms, such as oxygen atoms; L is 0 or an integer from 1 to 250, and D is a group of formula -(CR100*R101*-CR102*R103*)- wherein at least one of R100* , R101* R102* and R103* is different from R100, R101, R102, and R103, such that (D) is different from -[CR100R101-CR102R103]L^-; with the proviso that, when L^ and L are both different from 0, the recurring units are statistically distributed; – at least one second block [block (2)] complying with formula (II):
wherein m is 0 or an integer from 1 to 5;
SSPI 2022/021 R5 to R8, each independently, is selected in the group comprising, preferably consisting of, -F, perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms, and group of formula (III): (III) -R20-(X)y wherein R20 is a sigma bond, or linear or branched perfluoroalkyl chain comprising from 1 to 12 carbon atoms, preferably comprising and/or interrupted by at least one oxygen atom, X is a functional group, preferably selected from: -SO2F, -SO3H, -COOH, -COF, - CN, -Br and -CONH2; and y is an integer equal to 1 or 2; with the proviso that in formula (II), at least one, preferably one, of R5 to R8 is group of formula (III); – at least one third block [block (3)] complying with formula (IV):
(IV) wherein n is an integer from 1 to 3; R1 to R4, each independently, is selected in the group comprising, preferably consisting of, fluorine atom, perfluorinated linear or branched alkyl group having from 1 to 6 carbon atoms, group of formula (V): (V) -(R10)t[C(R11)(R12)-C(R13)(R14)(R15)]z wherein R10 is an oxygen atom, or a bi-/tri-/tetravalent perfluorinated alkyl chain comprising from 1 to 24 carbon atoms and being optionally interrupted by 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 in the group comprising, preferably consisting of: fluorine atom, perfluorinated linear or branched alkyl group having from 1 to 6 carbon atoms and group of formula (VI): -[(A)a-(B)b-(E)-(F)f]u-(A)-T (VI) wherein u is zero or an integer from 1 to 50; T is a perfluorinated alkyl group; a is zero or 1, each A is a PFPE chain; b is zero or an integer from 1 to 3, B is a block of formula (IV*): -[C(R1^)(R2^)-C(R3^)(R4^)]- (IV*) wherein R1^ to R4^ each independently has the meaning defined above for each of R1 to R4, respectively; E is a block of formula (I*) -[CR100^R101^-CR102^R103^]e^-(D*)e*- (I*) wherein e^ has the same meaning provided above for L^, each of R100^ R101^ ,R102^ and R103^ has the same meaning provided above for R100, R101, R102 and R103, respectively,
SSPI 2022/021 e* has the same meaning provided above for L, and D* has the same meaning provided above for D, with the proviso that, when e^ and e* are both different from 0, the recurring units are statistically distributed; f is 0 or an integer from 1 to 5, preferably from 1 to 2; F is a block of formula (II*): -[C(R5^)(R6^)-C(R7^)(R8^)]- wherein R5^ to R8^, each independently, has the meaning provided above for each of R5 to R8, respectively; with the proviso that : - in said formula (IV), at least one of R1 to R4 is a group of formula (V), - in said formula (IV*), at least one of R1^ to R4^ is a group of formula (V) - in said formula (V), one of R11 or R12 and one of R13 to R15, is a group of formula (VI), - in said formula (VI), the recurring units (A), (B), (E) and (F) are statistically distributed; and – optionally, at least one fourth block [block (4)] comprising a PFPE chain; with the proviso that, in copolymer (P): - the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; - the sum of (m+f) is at least 1, preferably from 1 to 100; - the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; and - said at least one block (1), said at least one block (2), said at least one block (3) and, when present, said at least one block (4) are statistically distributed. [0021] Advantageously, copolymer (P) according to the invention can be provided in liquid form or in semi-solid form. However, when required by the final use, copolymer (P) can also be provided in the form of solid, such as a rubber. [0022] Advantageously, copolymer (P) is characterised by a complex viscosity, measured at 0.1 rad/s and at 25°C, varying in a large range, such as from 10 Pa*s to more than 2000 Pa*s. [0023] It will be understood by those skilled in the art that said first chain end of said first and second PFPE chain correspond to the two chain ends of copolymer (P). [0024] Preferably, in copolymer (P), each of said PFPE chain is a fully fluorinated chain [chain (Rf)] comprising, preferably consists of, 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 chosen among the following : -CFXO- , -CF2CFXO-, -CF2CF2CF2O-, -CF2CF2CF2CF2O-, with each of X being independently -F or -CF3 and T being a C1-C3 perfluoroalkyl alkyl chain. [0025] Preferably, chain (Rf) complies with the following formula: (Rf-I) -[(CFX1O)g1(CFX2CFX3O)g2(CF2CF2CF2O)g3(CF2CF2CF2CF2O)g4]- wherein - X1 is independently selected from -F and -CF3,
SSPI 2022/021 - X2, X3, equal or different from each other and at each occurrence, are independently -F, -CF3, with the proviso that at least one of X is -F; - g1, g2 , g3, and g4, equal or different from each other, are independently integers ≥0, such that g1+g2+g3+g4 is in the range from 2 to 300, preferably from 2 to 100; should at least two of g1, g2, g3 and g4 be different from zero, the different recurring units are generally statistically distributed along the chain. [0026] More preferably, chain (Rf) is selected from chains of formula: (Rf-IIA) -[(CF2CF2O)a1(CF2O)a2]- wherein: - a1 and a2 are independently integers ≥ 0 such that the number average molecular weight is between 400 and 100,000 as determined via NMR, preferably between 400 and 50,000; both a1 and a2 are preferably different from zero, with the ratio a1/a2 being preferably comprised between 0.1 and 10; (Rf-IIB) -[(CF2CF2O)b1(CF2O)b2(CF(CF3)O)b3(CF2CF(CF3)O)b4]- wherein: b1, b2, b3, b4, are independently integers ≥ 0 such that the number average molecular weight is between 400 and 100,000 as determined via NMR, preferably between 400 and 50,000; preferably each of b1, b2, b3, b4 are > 0; (Rf-IIC) -[(CF2CF2O)c1(CF2O)c2(CF2(CF2)cwCF2O)c3]- wherein: cw = 1 or 2; c1, c2, and c3 are independently integers ≥ 0 chosen so that the number average molecular weight is between 400 and 100,000 as determined via NMR, preferably between 400 and 50,000; preferably c1, c2 and c3 are all > 0, with the ratio c3/(c1+c2) being generally lower than 0.2. [0027] Still more preferably, chain (Rf) complies with formula (Rf-III) here below: (Rf-III) -[(CF2CF2O)a1(CF2O)a2]- wherein: - a1, and a2 are integers > 0 such that the number average molecular weight is between 400 and 100,000 as determined via NMR, preferably between 400 and 50,000, with the ratio a1/a2 being generally between 0.1 and 10, more preferably between 0.2 and 5. [0028] Preferably, in block (1), at least one of L^ and L is different from 0. [0029] Preferably, in block (1), both L^ and L are different from 0. [0030] Preferably, R100, R101, R102 and R103, each independently, is a halogen atom, such as fluorine atom or chlorine atom. [0031] Preferably, in block (2), m is 0 or an integer from 1 to 2. [0032] Preferably, in block (2), one of R5 to R8 is a group of formula (V). [0033] Preferably, in block (2), R20 is a sigma bond or a group selected from those of formula (R20-i) to (R20-iv) as defined hereinafter: (R20-i) -(CF2)s1-O-(CF2)s2- wherein each of s1 and s2 is independently an integer from 1 to 6, preferably from 1 to 3; (R20-ii) -O-(CF2)s3- wherein s3 is an integer from 1 to 6, preferably from 1 to 5; (R20-iii) -O-R400-O-R401- wherein R400 is a linear or branched perfluorinated alkyl chain comprising from 1 to 6, preferably from 1 to 3, carbon atoms, and more preferably complying with formula -CF2-, -CF2CF2-, -CF2CF2CF2-, -CF2CF(CF3)-; and R401 is a linear or branched perfluorinated alkyl chain comprising from 1 to 3
SSPI 2022/021 carbon atoms, more preferably complying with formula -CF2-, -CF2CF2-, - CF(CF2)-; (R20-iv)
wherein R500 is a linear perfluorinated alkyl chain comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atoms and optionally interrupted by at least one oxygen atom; R501 is a chain of formula -OR503 wherein R503 is a linear perfluorinated alkyl chain comprising from 1 to 3 carbon atoms; R502 is a linear perfluorinated alkyl chain comprising from 1 to 4 carbon atoms and optionally interrupted by at least one oxygen atom; each of R501 and R502 bonding a group X as defined above. [0034] Preferably, in block (3) and formula (V), R10 complies with one of the following formulae: (R10-i) -(CF2)d(O)e(CF2O)fRCF(O)e*(CF2)d*(CF2O)f* wherein each of d, d*, e, e*, f and f* is independently zero or 1 and RCF is either a perfluoroalkyl chain comprising from 1 to 12, preferably from 1 to 8 carbon atoms, optionally interrupted by one or more oxygen atoms (R10-ii) -O-(C3F6O)h–(CF2)i-(C3F6O)j-O- wherein h = j and h + j is from 2 to 6, and i is from 2 to 6. [0035] In a second aspect, the present invention relates to a process [process (P)] for the manufacture of copolymer (P) as defined above. The process according to the present invention can be easily scaled up from laboratory scale to pilot and industrial scale. [0036] Advantageously, copolymer (P) of the present invention is prepared via process (P) comprising at least the following steps : (a) contacting: - at least one perfluoropolyether polymer comprising at least one peroxidic group [PFPE peroxy]; - at least one compound [compound (O)] selected in the group comprising, preferably consisting of: (i) fully halogenated olefin comprising from 2 to 15 carbon atoms; (ii) CF2=CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl group, preferably -CF3, -C2F5, -C3F7 ; a group C1-C12 [(per)fluoro]-oxyalkyl comprising catenary oxygen atoms, preferably perfluoro-2- propoxypropyl group; (iii) CF2=CFOCF2ORf2 wherein Rf2 is selected from the group consisting of C1-C6 perfluoro-alkyls; C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom, preferably Rf2 is -CF2CF3, -CF2CF2OCF3, or -CF3; (iv) CF2=CFCF2ORf7 wherein Rf7 is selected from the group consisting of C1-C6 perfluoro-alkyls, C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom; (v) perfluorodioxoles having formula :
SSPI 2022/021
wherein each of Rf3, Rf4, Rf5, Rf6, equal to or different from each other, is independently selected from the group consisting of fluorine atom and C1-C6 perfluoroalkyl groups, optionally comprising one or more than one oxygen atom, such as notably -CF3, -C2F5, -C3F7, -OCF3, -OCF2CF2OCF3; - at least one perfluorinated compound of formula (X-p):
(X-p) wherein each of R21 to R23 is independently -F or perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms, R20, X and y are as defined above for formula (III); - at least one perfluorinated compound of formula (XX-p):
(XX-p) wherein each of R21 to R23 are as defined above in formula (X-p), each of R31 to R33 is independently -F or perfluorinated alkyl group having from 1 to 6 carbon atoms, R10 is an oxygen atom, a perfluorinated alkyl chain comprising from 1 to 24 carbon atoms, optionally interrupted by at least one oxygen atom, t is zero or 1; each of z* and z** is independently 1 or 2; and (b) reacting said PFPE peroxy, said at least one compound of formula (X-p), said at least one compound of formula (XX-p) and at least one compound (O) in the presence of UV radiation or under heating. [0037] An advantage of the process for the manufacture of copolymer (P) according to the present invention is that the amounts of the reactants providing each of block (1), block (2) and block (3) can be tuned and selected a priori based on the desired properties of the final copolymer (P). This is advantageous as selecting a priori the amount of the reactants allows to tune the number of each block (1), block (2) and block (3) in copolymer (P). [0038] In step (a), the order in which the reactants are added is not limited. Accordingly, the PFPE peroxy, the compound of formula (X-p), the compound of formula (XX- p) and the compound (O) can be supplied to the reaction environment in any order.
SSPI 2022/021 [0039] Before step (a), the PFPE peroxy can be subjected to partial reduction of the peroxide bonds, for example by chemical reduction or UV treatment or thermal treatment. [0040] Preferably, said PFPE peroxy is a peroxidic perfluoropolyether polymer having two chain ends, each comprising a group selected from a linear or branched perfluorinated alkyl chain comprising from 1 to 6 carbon atoms or -C(=O)F, said two chain ends being bonded to opposite sides of a perfluoropolyether chain [chain (Rf)] comprising, preferably consisting of, repeating units (R°) being independently selected from the group consisting of formulae (i) to (v) as above defined and having a peroxidic content (PO), defined as grams of active oxygen (Mw = 16) in 100 g of PFPE peroxy between 0.1 and 4, preferably between 0.1 and 3.5. [0041] Preferably, in said PFPE peroxy, chain (Rf) complies with formulae (Rf-I), or (Rf- IIA), (Rf-IIB), (Rf-IIC) or (Rf-III) as defined above. [0042] According to a preferred embodiment, step (a) of the process of the present invention is performed with at least one compound (O). [0043] Preferably, said at least one compound (O) is selected in the group comprising, preferably consisting of: (i) fully halogenated olefin comprising from 2 to 10 carbon atoms, preferably from 2 to 8 carbon atoms. More preferably, it is selected in the group comprising: tetrafluoroethylene (TFE), hexafluoropropylene (HFP), chlorotrifluoroethylene (CTFE). TFE and HFP being particularly preferred. [0044] When two or more compounds (O) are used, preferably, the first compound (O) is selected from those defined in (i) above and a second compound (O) is selected in the group comprising, more preferably consisting of: (ii) CF2=CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl group, preferably -CF3, -C2F5, -C3F7 ; a group C1-C12 [(per)fluoro]-oxyalkyl comprising catenary oxygen atoms, preferably perfluoro-2- propoxypropyl group; (iii) CF2=CFOCF2ORf2 wherein Rf2 is selected from the group consisting of C1-C6 perfluoro-alkyls; C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom, preferably Rf2 is -CF2CF3, -CF2CF2OCF3, or -CF3; (iv) CF2=CFCF2ORf7 wherein Rf7 is selected from the group consisting of C1-C6 perfluoro-alkyls, C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom; (v) perfluorodioxoles having formula :
wherein each of Rf3, Rf4, Rf5, Rf6, equal to or different from each other, is independently selected from the group consisting of fluorine atom and C1-C6 perfluoroalkyl groups, optionally comprising one or more than one oxygen atom, such as notably -CF3, -C2F5, -C3F7, -OCF3, -OCF2CF2OCF3. [0045] Preferably, in said at least one compound of formula (X-p), each of R21, R22 and R23 is -F.
SSPI 2022/021 [0046] Preferably, in said compound (X-p), R20 is a sigma bond or a group selected from those of formula (R20-i) to (R20-iv) as defined hereinafter: (R20-i) -(CF2)s1-O-(CF2)s2- wherein each of s1 and s2 is independently an integer from 1 to 6, preferably from 1 to 3; (R20-ii) -O-(CF2)s3- wherein s3 is an integer from 1 to 6, preferably from 1 to 5; (R20-iii) -O-R400-O-R401- wherein R400 is a linear or branched perfluorinated alkyl chain comprising from 1 to 6, preferably from 1 to 3, carbon atoms, and more preferably complying with formula -CF2-, -CF2CF2-, -CF2CF2CF2-, -CF2CF(CF3)-; and R401 is a linear or branched perfluorinated alkyl chain comprising from 1 to 3 carbon atoms, more preferably complying with formula -CF2-, -CF2CF2-, - CF(CF2)-; (R20-iv)
wherein R500 is a linear perfluorinated alkyl chain comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atoms and optionally interrupted by at least one oxygen atom; R501 is a chain of formula -OR503 wherein R503 is a linear perfluorinated alkyl chain comprising from 1 to 3 carbon atoms; R502 is a linear perfluorinated alkyl chain comprising from 1 to 4 carbon atoms and optionally interrupted by at least one oxygen atom; each of R501 and R502 bonding a group X as defined above. [0047] Preferably, said at least one compound of formula (X-p) is selected in the group comprising, more preferably consisting of : CF2=CFCF2OCF2CF2COOH CF2=CFOCF2COOH CF2=CFO(CF2)5COOH CF2=CFOCF2CF2OCF2COOH CF2=CFOCF2CF2COOH CF2=CFCF2OCF2CF2COF CF2=CFOCF2COF CF2=CFO(CF2)3OCF(CF3)COF CF2=CFO(CF2)5COF CF2=CFOCF2CF(CF3)OCF2CF2CN CF2=CFOCF2CN CF2=CFO(CF2)5CN CF2=CFO(CF2)3OCF(CF3)CN CF2=CFCF2OCF2CF2CN CF2=CFOCF2CF2Br CF2=CFCF2OCF2CF2Br CF2=CFOCF2CF(CF3)OCF2CF2Br CF2=CFCF2OCF2CF2CONH2
SSPI 2022/021 CF2=CFOCF2CONH2 CF2=CFOCF2CF2CONH2 CF2=CFOCF2CF2SO2F CF2=CFSO2F CF2=CFOCF2CF(SO2F)2 CF2=CFOCF2CF(CF2OCF2CF2SO2F)(OCF2CF2SO2F) CF2=CFOCF2CF(CF2CF2SO2F)(OCF2CF2SO2F) CF2=CFOCF2OCF2CF(CF2OCF2CF2SO2F)(SO2F). [0048] Some exemplary compounds of formula (X-p) and the preparation thereof are provided in WO 03/106515 (in the name of Daikin Ind.), JP 2017-025242 (in the name of ASAHI GLASS CO., LTD.) and in US 2008/138685 (in the name of AGC Inc.). [0049] Preferably, in said compound of formula (XX-p), when t is 1, the one, two, three or four unsaturated moieties are bonded to the same or different atoms, preferably carbon atoms, belonging to R10. [0050] Preferably, said at least one compound of formula (XX-p) complies with the following formula: CF2=CF(R10)tCF=CF2 wherein t is zero or 1, and R10 complies with one of the following formulae: (R10-i) -(CF2)d(O)e(CF2O)fRCF(O)e*(CF2)d*(CF2O)f* wherein each of d, d*, e, e*, f and f* is independently zero or 1 and RCF is either a perfluoroalkyl chain comprising from 1 to 12, preferably from 1 to 8 carbon atoms, optionally interrupted by one or more oxygen atoms (R10-ii) -O-(C3F6O)h–(CF2)i-(C3F6O)j-O- wherein h = j and h + j is from 2 to 6, and i is from 2 to 6. [0051] According to a particularly preferred embodiment, said at least one compound of formula (XX-p) complies with the following formula: CF2=CF(R10)tCF=CF2 wherein t is 1 and R10 complies with formula: (R10-i) -(CF2)d(O)e(CF2O)fRCF(O)e*(CF2)d*(CF2O)f* wherein d, f, d* and f* are zero, e and e* are 1, and RCF is a linear perfluoroalkyl chain comprising from 1 to 10, preferably from 1 to 8 carbon atoms. [0052] Preferably, said compound of formula (XX-p) is selected from the group comprising, more preferably consisting of: CF2=CFCF=CF2 CF2=CFOCF=CF2 CF2=CFCF2OCF2CF=CF2 CF2=CFO-(CF2)3CF=CF2 CF2=CFCF2O(CF2)3OCF2-CF=CF2 CF2=CFCF2CF=CF2 CF2=CF(CF2)2CF=CF2 CF2=CF(CF2)3CF=CF2 CF2=CF(CF2)4CF=CF2 CF2=CFOCF2OCF=CF2 CF2=CFO(CF2)2OCF=CF2 CF2=CFO(CF2)3OCF=CF2 CF2=CFO(CF2)4OCF=CF2 CF2=CF(CF2)2OCF=CF2
SSPI 2022/021
wherein h and j are the same and their sum is from 2 to 6 and i is from 2 to 6. [0053] The amount of each of said at least one compound (X-p), compound (XX-p) and compound (O) is not limited. As explained above, the amount of each of the above mentioned compounds can advantageously be selected based on both the amount of the PFPE peroxy, as well as its peroxidic content, and the properties desired in the final copolymer (P). [0054] For example, the equivalents of double bonds of said compound (X-p) to the equivalents of peroxidic groups preferably range from 1:100 to 5000:100. Also, the equivalents of double bonds of said compound (XX-p) to the equivalents of peroxidic groups preferably range from 1:100 to 100:100. [0055] Step (a) of process (P) can be advantageously performed by contacting said PFPE peroxy with one compound of formula (X-p). [0056] Alternatively, said step (a) can be performed by contacting said PFPE peroxy with two or more compounds of formula (X-p). [0057] Step (a) of process (P) can be advantageously performed by contacting said PFPE peroxy with one compound of formula (XX-p). [0058] Alternatively, said step (a) can be performed by contacting said PFPE peroxy with two or more compounds of formula (XX-p). [0059] Step (a) and step (b) can be performed in the presence of a fluorinated solvent. [0060] Preferably said fluorinated solvent is selected in the group comprising: perfluorocarbons, hydrofluorocarbons, perfluoropolyethers, hydrofluoro- polyethers. [0061] Preferably, step (b) is performed in the presence of UV radiation for a time from 2 to 150 hours, more preferably from 5 to 100 hours. [0062] Preferably, step (b) is performed in the presence of UV radiation at a temperature from -60°C to +150°C, more preferably from -20°C to +100°C and even more preferably from 0°C to 60°C. [0063] As an alternative, step (b) can be performed under thermal treatment, preferably by heating at a temperature from 150 °C to 250 °C. [0064] Preferably, said step (b) is performed in an inert atmosphere. [0065] In a third aspect, the present invention relates to copolymer (P) obtained via process (P) as described above. [0066] Advantageously, the functional groups introduced as pendant groups in block (3) of copolymer (P), such as notably -SO2F, -SO3H, -COOH, -COF, -CN, -Br and - CONH2, as well as the functional groups at the chain ends of copolymer (P), such as notably -COF and -OC(O)F, can be properly reacted to obtain other different functional groups. [0067] The expression “can be reacted” is intended to indicate that such functional groups can for example be salified, hydrolyzed, reduced, oxidised, or undergo a
SSPI 2022/021 different chemical reaction to provide functional group(s) endowed with the desired reactivity, taking into consideration the final use of copolymer (P). [0068] Advantageously, copolymer (PF) according to the present invention is obtained from process (P) as described above, which further comprises after said step (b) , at least one step (c) comprising at least one of salification, hydrolyzation, oxidation, reduction or another chemical reaction capable of providing functional group(s) of interest. [0069] The present invention further encompasses copolymer (PF) obtained at the end of step (c) of process (P). [0070] Hence, the present invention encompasses a block copolymer [copolymer (PF)] comprising a first and a second perfluoropolyether chain [PFPE chain] each having two chain ends, wherein the first chain end of each one of said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -COOH and salts thereof with an organic cation, preferably onium cation, more preferably ammonium, or an inorganic cation, preferably an alkaline metal, more preferably Na+, K+ ; -COOR wherein R is a linear or branched alkyl chain comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atoms, more preferably 1 carbon atoms; -COF; -CONH2; - CON(R300)(R301) wherein each of R300 and R301 have the same meanings defined for R; -(R)cOH with c being 0 or 1 and R being as defined above; -C(O)-O-C(O)R with R being as defined above; with the proviso that (i) at least one chain end of said first and second PFPE chain comprises a group different from a perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms and (ii) when one chain end comprises group -COF, the other chain end does not comprises a perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms or -COF; and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I): -[CR100R101-CR102R103]L^-(D)L- (I) wherein L^, L, D, R100, R101, R102 and R103 have the meanings defined above; – at least one second block [block (2)] complying with formula (II):
wherein m, R5 to R8, have the meanings defined above; – at least one third block [block (3)] complying with formula (IV):
(IV) wherein n, R1 to R4, have the meanings defined above;
SSPI 2022/021 and – optionally, at least one fourth block [block (4)] comprising a PFPE chain; with the proviso that, in copolymer (PF): - the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; - the sum of (m+f) is at least 1, preferably from 1 to 100; - the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; and - said at least one block (1), said at least one block (2), said at least one block (3) and, when present, said at least one block (4) are statistically distributed. [0071] In another aspect, the present invention relates to a mixture [mixture (PF)] comprising two or more copolymers (PF) as defined above. [0072] While purification steps can be performed after any of step (b) and/or step (c) of said process (P), mixtures of copolymers (P) or copolymers (PF) according to the present invention are typically obtained. [0073] Thus, in a further aspect, the present invention relates to a mixture [mixture (P)] comprising two or more copolymers (P) as defined above. [0074] It will be clear to those skilled in the art that mixture (P) is obtained via process (P) as described above. [0075] Advantageously, said mixture (P) can be subjected to one or more purification steps (also referred to as “fractionation” steps), thus obtaining separate copolymers (P) characterised by different viscosities and/or number average molecular weights as measured by 19F-NMR and/or functionality (F), preferably from 3 to 102. [0076] Said mixtures can further contain the PFPE peroxy used as starting material and/or mixtures of copolymers (P) containing peroxy groups [copolymer (PO-O)] and/or mixtures of copolymers (PF) containing peroxy groups [copolymers (PF-O-O)] can be obtained. [0077] In another aspect, the present invention related to a mixture [mixture (M1)] comprising at least one copolymer (P) as defined above, and at least one of said PFPE peroxy used as starting material and/or one or more of copolymers (PO-O). [0078] In another aspect, the present invention relates to a mixture [mixture (M2)] comprising at least one copolymer (PF) as defined above, and at least one of at least one of copolymer (P) as defined above, said PFPE peroxy used as starting material, said one or more copolymers (PO-O), and/or said one or more copolymers (PF-O-O). [0079] Advantageously, copolymer (PO-O) and/or copolymer (PF-O-O) can be isolated and used as intermediate in other processes. [0080] While the amount of peroxy groups that can be present in the mixture containing copolymer (P) or copolymer (PF) of the present invention can be up to 99% based on the amount of the starting peroxy groups in the PFPE peroxy, depending on the final application the amount of said peroxy groups can be properly adjusted for example up to 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5%. [0081] More preferably, the amount of said peroxy groups is up to 1, even more preferably up to 0.5 % and still more preferably up to 0.1%. [0082] In another aspect, the present invention relates to a block copolymer [copolymer (PO-O)] comprising a first and a second perfluoropolyether chain [PFPE chain], wherein each of said first and second PFPE chain is a chain (Rf) as defined above or is a chain (RfO-O) wherein (RfO-O) is a repeating units complying with any one of formulae (i) to (v) as defined above for (R°) and having a peroxidic content (PO), defined as grams of active oxygen (Mw = 16) in 100 g of PFPE peroxy between 0.1 and 4, preferably between 0.1 and 3.5, each of said first and second PFPE chain having two chain ends, wherein the first chain end of each one of
SSPI 2022/021 said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -C(=O)F and -OC(=O)F; and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I) as defined above; – at least one second block [block (2)] complying with formula (II) as defined above; – at least one third block [block (3)] complying with formula (IV) as defined above; and/or – optionally, at least one fourth block [block (4)] comprising a PFPE chain as defined above; with the proviso that * in copolymer (PO-O) – said block (1), said block (2), said block (3) and, when present, said at least one block (4) are statistically distributed, – the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; – the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; – the sum of (m+f) is at least 1, preferably from 1 to 100. [0083] In a still another embodiment, the present invention relates to a block copolymer [copolymer (PF-O-O)] comprising comprising a first and a second perfluoropolyether chain [PFPE chain], wherein each of said first and second PFPE chain is a chain (Rf) as defined above or is a chain (RfO-O) wherein (RfO-O) is a repeating units complying with any one of formulae (i) to (v) as defined above for (R°) and having a peroxidic content (PO), defined as grams of active oxygen (Mw = 16) in 100 g of PFPE peroxy between 0.1 and 4, preferably between 0.1 and 3.5, each of said first and second PFPE chain having two chain ends, wherein the first chain end of each one of said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -COOH and salts thereof with an organic cation, preferably onium cation, more preferably ammonium, or an inorganic cation, preferably an alkaline metal, more preferably Na+, K+; -COOR with R being as defined above; -COF; -CON(R300)(R301) wherein each of R300 and R301 are a hydrogen atom or have the same meanings defined for R; -(R)cOH with c being 0 or 1 and R being as defined above; -C(O)-O-C(O)R with R being as defined above; -Br; -CN2; and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I) as defined above; – at least one second block [block (2)] complying with formula (II) as defined above; – at least one third block [block (3)] complying with formula (IV) as defined above; and/or – optionally, at least one fourth block [block (4)] comprising a PFPE chain as defined above; with the proviso that * in copolymer (PF-O-O) – said block (1), said block (2), said block (3) and, when present, said at least one block (4) are statistically distributed, – the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; – the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; – the sum of (m+f) is at least 1, preferably from 1 to 100.
SSPI 2022/021 [0084] Copolymer (P) and/or copolymer (PF) according to the present invention can be used for different applications in several industries, wherein outstanding resistance and durability at high temperature and harsh environments is required. For example, copolymer (P) and/or copolymer (PF) can be used as base oils as lubricants. Alternatively, copolymer (P) and/or copolymer (PF) can be used as additives in halogenated oils and/or greases. [0085] To this aim and advantageously, the copolymers according to the present invention as well as the mixtures described herein, are in the liquid state at room temperature, or even at temperatures lower than room temperature, with advantages in handling and storage of the copolymers. [0086] Hence, advantageously, copolymer (P) is in the liquid state at room temperature. [0087] Also, advantageously, copolymer (PF) is in the liquid state at room temperature. [0088] In addition, each of copolymer (PO-O) and copolymer (PF-O-O) as well as each of mixture (M1) and mixture (M2) is in the liquid state at room temperature. [0089] Should the disclosure of any patents, patent applications, and publications which are incorporated herein by reference conflict with the description of the present application to the extent that it may render a term unclear, the present description shall take precedence. [0090] The invention will be hereinafter illustrated in greater detail by means of the Examples contained in the following Experimental Section; the Examples are merely illustrative and are by no means to be interpreted as limiting the scope of the invention. Experimental section [0091] Materials [0092] Peroxidic perfluoropolyether oil was obtained by Solvay Specialty Polymers Italy S.p.A., complying with formula XO-(CF2CF2O)a1(CF2O)a2(O)h-X’ wherein X and X’ were -CF3, -CF2COF, -COF and having the following properties: Mn = 31990 g/mol; P.O.= 1.61%; a1/a2 = 1.0 [0093] The following were purchased by Anles LTD and used as such: (8CNVE) CF2=CFOCF2CF(CF3)OCF2CF2CN (PBVE) CF2=CFOCF2CF2CF2OCF=CF2 [0094] Perfluorinated solvents Galden(R) HT200 and Galden(R) D100, as well as tetrafluoroethylene (TFE) and perfluoro-methylvinyl-ether (PMVE), and perfluorinated sulfonyl vinyl ether (VEFS) CF2=CFOCF2CF2SO2F were obtained by Solvay Specialty Polymers Italy S.p.A.. [0095] Methods: [0096] 19F-NMR-Varian Mercury 300 MHz spectrometer working for the 19F nucleus was used to obtain the structure, molecular weight, chain end composition of the perfluoropolyether oils. The 19F-NMR spectrum was obtained on pure samples using CFCl3 as internal reference. [0097] The peroxidic content (PO) was expressed as grams of peroxidic oxygen per 100 g of polymer. The analysis of the peroxide content was carried out by iodometric titration using a Mettler DL40 device equipped with platinum electrode. The sensitivity limit for the PO determination was 0.0002%. [0098] GPC analyses were performed on a Waters GPC equipped with an RI detector and operating at 35°C. All average molecular weight results are reported compared to perfluoropolyethers linear neutral internal standards. [0099] The complex viscosity was measured by means of frequency sweep tests, using an MCR502 Anton-Paar rheometer with parallel plate geometry (25mm diameter).
SSPI 2022/021 The viscosity was measured in this way at 25°C and 100°C and its value at 0.1 rad/s of oscillation is reported. [00100] Example 1 - PFPE copolymer with VEFS, TFE, PMVE and PBVE [00101] 250.3 g of the peroxidic perfluoropolyether oil described above were charged in a 1500 mL stirred cylindrical photochemical reactor equipped with a high pressure mercury lamp model HANAU TQ150, a thermocouple, a condenser and a mechanical stirrer. [00102] The oil was diluted with 1876 g of Galden(R) HT200 and then 23.0 g of VEFS and 1.1 g of PBVE were added to the reactor. [00103] The mixture was then purged with nitrogen under stirring, after which two fluorinated olefins, PMVE and TFE, were introduced into the reactor, at a rate of 14.6 and 8.0 g/h, respectively. After the flow started, the UV lamp was switched on and the reaction was conducted at 20°C for 7h. After this time the olefin flows were interrupted, the UV lamp was switched off. [00104] The obtained solution was distilled at 240°C for 4h in a round bottom flask equipped with a magnetic stirrer in order to remove the solvent and unreacted monomer traces. The distillation was conducted first at atmospheric pressure, then under reduced pressure (0.1 mbar) until complete removal of the solvent. [00105] 298.0 g of copolymer in the form of a clear viscous oil were obtained as residue, which was analysed by iodometric titration to confirm the complete removal of the peroxide units. [00106] 19F-NMR analysis confirmed the absence of residual peroxide units. [00107] The incorporation of VEFS, TFE and MVE in the copolymer was at a concentration respectively of 5.3, 13.9 and 9.8 weight %. [00108] The copolymer had a1/a2 = 0.9 and X and X’= -CF3, -CF2COF and -OCOF. [00109] Example 2 – PFPE copolymers with 8CNVE, PBVE, TFE and PMVE [00110] 251.8 g of the peroxidic perfluoropolyether oil described above were charged in the same reactor as Example 1. The oil was diluted with 1873 g of Galden(R) D100. Next, 29.2 g of 8CNVE and 2.5 g of PBVE were added to the reactor. [00111] The mixture was then purged with nitrogen under stirring, after which two fluorinated olefins, PMVE and TFE, were introduced into the reactor, at a rate of 17.1 and 9.3 g/h, respectively. After the flow started, the UV lamp was switched on and the reaction was conducted at 20°C for 6h. After this time the olefin flows were interrupted and the UV lamp was kept on for further 35 hours at 20°C. [00112] After a total of 35 hours of UV irradiation, the lamp was switched off and the reaction mixture was transferred into a 2-L round bottom flask. The mixture was stripped at 120°C for 6h under reduced pressure (0.1 mbar) until complete removal of the solvent and unreacted monomer traces. [00113] 271.4 g of copolymer in the form of a clear viscous oil were obtained as residue. [00114] 19F-NMR analysis confirmed the incorporation of 8CNVE, TFE and MVE in the copolymer at a concentration respectively of 7.0, 14.2 and 9.6 weight %. [00115] The copolymer had a1/a2 = 0.9 and X and X’= -CF3, -CF2COF and -OCOF. [00116] The introduction of the -CN functional groups was also confirmed by FT-IR spectroscopy measurements, confirming the presence of the peak at 2269 cm-1. [00117] Comparative Example 1 - PFPE copolymers with VEFS, TFE and PMVE [00118] 251 g of the peroxidic perfluoropolyether oil described above were charged in a the same reactor as Example 1. The oil was diluted with 1876 g of a
SSPI 2022/021 perfluorinated solvent, Galden(R) HT200, and 14.0 g of VEFS were added to the reactor. [00119] The mixture was then purged with nitrogen under stirring, after which two fluorinated olefins, PMVE and TFE, were introduced into the reactor, at a rate of 14.6 and 8.0 g/h, respectively. After the flow started, the UV lamp was switched on and the reaction was conducted at 20°C for 7h. After this time, the olefin flows were interrupted, the UV lamp was switched off [00120] The obtained solution was distilled at 240°C for 4h in a round bottom flask equipped with a magnetic stirrer in order to remove the solvent and unreacted monomer traces. The distillation was conducted first at atmospheric pressure, then under reduced pressure (0.1 mbar) until complete removal of the solvent. [00121] 275.1 g of copolymer in the form of a clear viscous oil were obtained as residue, which was analysed by iodometric titration to confirm the complete removal of the peroxide units. [00122] 19F-NMR analysis confirmed the incorporation of VEFS, TFE and PMVE in the copolymer at a concentration respectively of 3.8, 13.4 and 9.6 weight % . [00123] The copolymer had Mn = 35600 g/mol, a1/a2 = 0.9 and X and X’= -CF3, -CF2COF and -OCOF. [00124] Comparative Example 2 - PFPE copolymers with 8CNVE, TFE and PMVE [00125] 250 g of the peroxidic perfluoropolyether oil described above were charged in the same reactor as Example 1. The oil was diluted with 1875 g of a perfluorinated solvent, Galden(R) D100, and 29.2 g of 8CNVE were added to the reactor. [00126] The mixture was then purged with nitrogen under stirring, after which two fluorinated olefins, PMVE and TFE, were introduced into the reactor, at a rate of 17.1 and 9.3 g/h, respectively. After the flow started, the UV lamp was switched on and the reaction was conducted at 20°C for 6h. After this time the olefin flows were interrupted and the UV lamp was kept on for further 35 hours at 20°C. [00127] After a total of 35 hours of UV irradiation, the lamp was switched off and the reaction mixture was transferred into a 2-L round bottom flask. The mixture was stripped at 120°C for 6h under reduced pressure (0.1 mbar) until complete removal of the solvent and unreacted monomer traces. [00128] 265 g of copolymer in the form of a clear viscous oil were obtained as residue. [00129] 19F-NMR analysis of the product confirmed the incorporation of 8CNVE, TFE and PMVE in the copolymer at a concentration respectively of 7.3, 12.0 and 11.4 weight %. [00130] The copolymer had: Mn = 35000 g/mol, a1/a2 = 0.9, and X and X’= -CF3 , - CF2COF and -OCOF. [00131] The properties of the copolymers according to the invention and of comparison are summarised in Table 1 below. Table 1
SSPI 2022/021
(*) comparative n/p = not performed
Claims
SSPI 2022/021 Claims Claim 1. A block copolymer [copolymer (P)] comprising a first and a second perfluoropolyether chain [PFPE chain] each having two chain ends, wherein the first chain end of each one of said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -C(=O)F and -OC(=O)F, and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I): -[CR100R101-CR102R103]L^-(D)L- (I) wherein L^ is 0 or an integer from 1 to 250; R100, R101, R102 and R103 are each independently selected from halogen atom, more preferably fluorine or chlorine atom; linear or branched alkyl chain comprising from 1 to 6 carbon atoms; -OR200 wherein R200 is a linear or branched perfluorinated chain comprising from 1 to 6 carbon atoms or a group of formula -CF2OR201 in which R201 is a perfluorinated alkyl chain comprising from 1 to 6 carbon atoms, optionally interrupted by one or more oxygen ether atoms; or one of R100 and R101 and one of R102 and R103 are a fluorine atom and the other of R100 and R101 and the other of R102 and R103 together form a perhalogenated cyclic ring having from 4 to 6 members, optionally comprising heteroatoms, such as oxygen atoms; L is 0 or an integer from 1 to 250, and D is a group of formula -(CR100*R101*-CR102*R103*)- wherein at least one of R100* , R101* R102* and R103* is different from R100, R101, R102, and R103, such that (D) is different from -[CR100R101-CR102R103]L^-; with the proviso that, when L^ and L are both different from 0, the recurring units are statistically distributed; – at least one second block [block (2)] complying with formula (II):
wherein m is 0 or an integer from 1 to 5; R5 to R8, each independently, is selected in the group comprising, preferably consisting of, -F, perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms, and group of formula (III): (III) -R20-(X)y wherein R20 is a sigma bond, or linear or branched perfluoroalkyl chain comprising from 1 to 12 carbon atoms, preferably comprising and/or interrupted by at least one oxygen atom, X is a functional group, preferably selected from: -SO2F, -SO3H, -COOH, -COF, -CN, - Br and -CONH2; and y is an integer equal to 1 or 2; with the proviso that in formula (II), at least one, preferably one, of R5 to R8 is group of formula (III); – at least one third block [block (3)] complying with formula (IV):
SSPI 2022/021
(IV) wherein n is an integer from 1 to 3; R1 to R4, each independently, is selected in the group comprising, preferably consisting of, fluorine atom, perfluorinated linear or branched alkyl group having from 1 to 6 carbon atoms, group of formula (V): (V) -(R10)t[C(R11)(R12)-C(R13)(R14)(R15)]z wherein R10 is an oxygen atom, or a bi-/tri-/tetravalent perfluorinated alkyl chain comprising from 1 to 24 carbon atoms and being optionally interrupted by 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 in the group comprising, preferably consisting of: fluorine atom, perfluorinated linear or branched alkyl group having from 1 to 6 carbon atoms and group of formula (VI): -[(A)a-(B)b-(E)-(F)f]u-(A)-T (VI) wherein u is zero or an integer from 1 to 50; T is a perfluorinated alkyl group; a is zero or 1, each A is a PFPE chain; b is zero or an integer from 1 to 3, B is a block of formula (IV*): -[C(R1^)(R2^)-C(R3^)(R4^)]- (IV*) wherein R1^ to R4^ each independently has the meaning defined above for each of R1 to R4, respectively; E is a block of formula (I*) -[CR100^R101^-CR102^R103^]e^-(D*)e*- (I*) wherein e^ has the same meaning provided above for L^, each of R100^ R101^ ,R102^ and R103^ has the same meaning provided above for R100, R101, R102 and R103, respectively, e* has the same meaning provided above for L, and D* has the same meaning provided above for D, with the proviso that, when e^ and e* are both different from 0, the recurring units are statistically distributed; f is 0 or an integer from 1 to 5, preferably from 1 to 2; F is a block of formula (II*): -[C(R5^)(R6^)-C(R7^)(R8^)]- wherein R5^ to R8^, each independently, has the meaning provided above for each of R5 to R8, respectively; with the proviso that : - in said formula (IV), at least one of R1 to R4 is a group of formula (V), - in said formula (IV*), at least one of R1^ to R4^ is a group of formula (V)
SSPI 2022/021 - in said formula (V), one of R11 or R12 and one of R13 to R15, is a group of formula (VI), - in said formula (VI), the recurring units (A), (B), (E) and (F) are statistically distributed; and – optionally, at least one fourth block [block (4)] comprising a PFPE chain; with the proviso that, in copolymer (P): - the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; - the sum of (m+f) is at least 1, preferably from 1 to 100; - the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; and - said at least one block (1), said at least one block (2), said at least one block (3) and, when present, said at least one block (4) are statistically distributed. Claim 2. The copolymer (P) according to Claim 1, wherein each of said PFPE chain is a fully fluorinated chain [chain (Rf)] comprising 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 chosen among the following : -CFXO- , -CF2CFXO-, -CF2CF2CF2O-, -CF2CF2CF2CF2O-, with each of X being independently -F or -CF3 and T being a C1-C3 perfluoroalkyl alkyl chain. Claim 3. The copolymer (P) according to Claim 2, wherein said chain (Rf) complies with the following formula: (Rf-I) -[(CFX1O)g1(CFX2CFX3O)g2(CF2CF2CF2O)g3(CF2CF2CF2CF2O)g4]- wherein - X1 is independently selected from -F and -CF3, - X2, X3, equal or different from each other and at each occurrence, are independently -F, -CF3, with the proviso that at least one of X is -F; - g1, g2 , g3, and g4, equal or different from each other, are independently integers ≥0, such that g1+g2+g3+g4 is in the range from 2 to 300, preferably from 2 to 100; should at least two of g1, g2, g3 and g4 be different from zero, the different recurring units are generally statistically distributed along the chain. Claim 4. The copolymer (P) according to any one of the preceding Claims, wherein in said block (1): - at least one of L^ and L is different from 0; and/or - R100, R101, R102 and R103, each independently, is a halogen atom, preferably fluorine atom or chlorine atom. Claim 5. The copolymer (P) according to any one of the preceding Claims, wherein in said block (2): - m is 0 or an integer from 1 to 2; - one of R5 to R8 is a group of formula (V); and/or - R20 is a sigma bond or a group selected from those of formula (R20-i) to (R20-iv) as defined hereinafter:
SSPI 2022/021 (R20-i) -(CF2)s1-O-(CF2)s2- wherein each of s1 and s2 is independently an integer from 1 to 6, preferably from 1 to 3; (R20-ii) -O-(CF2)s3- wherein s3 is an integer from 1 to 6, preferably from 1 to 5; (R20-iii) -O-R400-O-R401- wherein R400 is a linear or branched perfluorinated alkyl chain comprising from 1 to 6, preferably from 1 to 3, carbon atoms, and more preferably complying with formula - CF2-, -CF2CF2-, -CF2CF2CF2-, -CF2CF(CF3)-; and R401 is a linear or branched perfluorinated alkyl chain comprising from 1 to 3 carbon atoms, more preferably complying with formula -CF2-, -CF2CF2-, -CF(CF2)-; (R20-iv)
wherein R500 is a linear perfluorinated alkyl chain comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atoms and optionally interrupted by at least one oxygen atom; R501 is a chain of formula -OR503 wherein R503 is a linear perfluorinated alkyl chain comprising from 1 to 3 carbon atoms; R502 is a linear perfluorinated alkyl chain comprising from 1 to 4 carbon atoms and optionally interrupted by at least one oxygen atom; each of R501 and R502 bonding a group X as defined above. Claim 6. The copolymer (P) according to any one of the preceding Claims, wherein in said block (3) and formula (V), R10 complies with one of the following formulae:
wherein each of d, d*, e, e*, f and f* is independently zero or 1 and RCF is either a perfluoroalkyl chain comprising from 1 to 12, preferably from 1 to 8 carbon atoms, optionally interrupted by one or more oxygen atoms (R10-ii) -O-(C3F6O)h–(CF2)i-(C3F6O)j-O- wherein h = j and h + j is from 2 to 6, and i is from 2 to 6. Claim 7. A process [process (P)] for the manufacture of copolymer (P) as defined in any one of Claims 1 to 6, said process (P) comprising the steps of: (a) contacting: - at least one perfluoropolyether polymer comprising at least one peroxidic group [PFPE peroxy]; - at least one compound [compound (O)] selected in the group comprising, preferably consisting of: (i) fully halogenated olefin comprising from 2 to 15 carbon atoms; (ii) CF2=CFORf, wherein
SSPI 2022/021 Rf is a C1-C6 (per)fluoroalkyl group, preferably -CF3, -C2F5, -C3F7 ; a group C1-C12 [(per)fluoro]-oxyalkyl comprising catenary oxygen atoms, preferably perfluoro-2- propoxypropyl group; (iii) CF2=CFOCF2ORf2 wherein Rf2 is selected from the group consisting of C1-C6 perfluoro-alkyls; C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom, preferably Rf2 is -CF2CF3, -CF2CF2OCF3, or -CF3; (iv) CF2=CFCF2ORf7 wherein Rf7 is selected from the group consisting of C1-C6 perfluoro-alkyls, C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom; (v) perfluorodioxoles having formula :
wherein each of Rf3, Rf4, Rf5, Rf6, equal to or different from each other, is independently selected from the group consisting of fluorine atom and C1-C6 perfluoroalkyl groups, optionally comprising one or more than one oxygen atom, such as notably -CF3, -C2F5, -C3F7, -OCF3, -OCF2CF2OCF3; - at least one perfluorinated compound of formula (X-p):
(X-p) wherein each of R21 to R23 is independently -F or perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms, R20, X and y are as defined above for formula (III); - at least one perfluorinated compound of formula (XX-p):
(XX-p) wherein each of R21 to R23 are as defined above in formula (X-p), each of R31 to R33 is independently -F or perfluorinated alkyl group having from 1 to 6 carbon atoms, R10 is an oxygen atom, a perfluorinated alkyl chain comprising from 1 to 24 carbon atoms, optionally interrupted by at least one oxygen atom, t is zero or 1;
SSPI 2022/021 each of z* and z** is independently 1 or 2; and (b) reacting said PFPE peroxy, said at least one compound of formula (X-p), said at least one compound of formula (XX-p) and at least one compound (O) in the presence of UV radiation or under heating. Claim 8. The process (P) according to Claim 7, wherein process (P) comprises before step (a), a step of subjecting the PFPE peroxy to partial reduction of the peroxide bonds. Claim 9. The process (P) according to any one of Claims 7 and 8, wherein said PFPE peroxy is a peroxidic perfluoropolyether polymer having two chain ends, each comprising a group selected from a linear or branched perfluorinated alkyl chain comprising from 1 to 6 carbon atoms or -C(=O)F, said two chain ends being bonded to opposite sides of a perfluoropolyether chain [chain (Rf)] comprising, preferably consisting of, repeating units (R°) being independently selected from the group consisting of formulae (i) to (v) according to Claim 2 and having a peroxidic content (PO), defined as grams of active oxygen (Mw = 16) in 100 g of PFPE peroxy between 0.1 and 4, preferably between 0.1 and 3.5. Claim 10. The process (P) according to any one of Claims 7 to 9, wherein said process (P) is performed: - with at least one compound (O) selected in the group comprising fully halogenated olefin comprising from 2 to 10 carbon atoms, preferably from 2 to 8 carbon atoms and more preferably selected in the group comprising: tetrafluoroethylene (TFE), hexafluoropropylene (HFP), chlorotrifluoroethylene (CTFE); and/or - with at least two compounds (O), wherein the first compound (O) is selected in the group comprising fully halogenated olefin comprising from 2 to 15 carbon atoms, and the second compound (O) is selected in the group comprising: (ii) CF2=CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl group, preferably -CF3, -C2F5, -C3F7 ; a group C1-C12 [(per)fluoro]-oxyalkyl comprising catenary oxygen atoms, preferably perfluoro-2- propoxypropyl group; (iii) CF2=CFOCF2ORf2 wherein Rf2 is selected from the group consisting of C1-C6 perfluoro-alkyls; C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom, preferably Rf2 is -CF2CF3, -CF2CF2OCF3, or -CF3; (iv) CF2=CFCF2ORf7 wherein Rf7 is selected from the group consisting of C1-C6 perfluoro-alkyls, C5-C6 cyclic perfluoro-alkyls, and C2-C6 perfluoro-oxy-alkyls, comprising at least one catenary oxygen atom; (v) perfluorodioxoles having formula :
wherein each of Rf3, Rf4, Rf5, Rf6, equal to or different from each other, is independently selected from the group consisting of fluorine atom and C1-C6 perfluoroalkyl groups, optionally comprising one or more than one oxygen atom, such
SSPI 2022/021 as notably -CF3, -C2F5, -C3F7, -OCF3, -OCF2CF2OCF3. Claim 11. The process (P) according to any one of Claims 7 to 10, wherein in said compound (X-p), R20 is a sigma bond or a group selected from those of formula (R20-i) to (R20-iv) as defined hereinafter: (R20-i) -(CF2)s1-O-(CF2)s2- wherein each of s1 and s2 is independently an integer from 1 to 6, preferably from 1 to 3; (R20-ii) -O-(CF2)s3- wherein s3 is an integer from 1 to 6, preferably from 1 to 5; (R20-iii) -O-R400-O-R401- wherein R400 is a linear or branched perfluorinated alkyl chain comprising from 1 to 6, preferably from 1 to 3, carbon atoms, and more preferably complying with formula - CF2-, -CF2CF2-, -CF2CF2CF2-, -CF2CF(CF3)-; and R401 is a linear or branched perfluorinated alkyl chain comprising from 1 to 3 carbon atoms, more preferably complying with formula -CF2-, -CF2CF2-, -CF(CF2)-; (R20-iv)
wherein R500 is a linear perfluorinated alkyl chain comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atoms and optionally interrupted by at least one oxygen atom; R501 is a chain of formula -OR503 wherein R503 is a linear perfluorinated alkyl chain comprising from 1 to 3 carbon atoms; R502 is a linear perfluorinated alkyl chain comprising from 1 to 4 carbon atoms and optionally interrupted by at least one oxygen atom; each of R501 and R502 bonding a group X as defined above. Claim 12. The process (P) according to any one of Claims 7 to 11, wherein said compound of formula (XX-p) complies with formula CF2=CF(R10)tCF=CF2 wherein t is zero or 1, and R10 complies with one of the following formulae: (R10-i) -(CF2)d(O)e(CF2O)fRCF(O)e*(CF2)d*(CF2O)f* wherein each of d, d*, e, e*, f and f* is independently zero or 1 and RCF is either a perfluoroalkyl chain comprising from 1 to 12, preferably from 1 to 8 carbon atoms, optionally interrupted by one or more oxygen atoms (R10-ii) -O-(C3F6O)h–(CF2)i-(C3F6O)j-O- wherein h = j and h + j is from 2 to 6, and i is from 2 to 6. Claim 13. The process (P) according to any one of Claims 7 to 12, wherein: - step (a) and step (b) are performed in the presence of a fluorinated solvent; and/or - step (b) is performed - in the presence of UV radiation for a time from 2 to 150 hours; - in the presence of UV radiation at a temperature from -60°C to +150°C;
SSPI 2022/021 - under thermal treatment at a temperature from 150 °C to 250 °C; - under inert atmosphere. Claim 14. A block copolymer [copolymer (PF)] comprising a first and a second perfluoropolyether chain [PFPE chain] each having two chain ends, wherein the first chain end of each one of said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -COOH and salts thereof with an organic cation, preferably onium cation, more preferably ammonium, or an inorganic cation, preferably an alkaline metal, more preferably Na+, K+ ; -COOR wherein R is a linear or branched alkyl chain comprising from 1 to 6 carbon atoms, preferably from 1 to 3 carbon atoms, more preferably 1 carbon atoms; -COF; -CONH2; -CON(R300)(R301) wherein each of R300 and R301 have the same meanings defined for R; -(R)cOH with c being 0 or 1 and R being as defined above; -C(O)-O-C(O)R with R being as defined above; with the proviso that (i) at least one chain end of said first and second PFPE chain comprises a group different from a perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms and (ii) when one chain end comprises group -COF, the other chain end does not comprises a perfluorinated linear or branched alkyl chain having from 1 to 6 carbon atoms or -COF; and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I): -[CR100R101-CR102R103]L^-(D)L- (I) wherein L^, L, D, R100, R101, R102 and R103 have the meanings defined in Claims 1 and 4; – at least one second block [block (2)] complying with formula (II):
wherein m, R5 to R8, have the meanings defined in Claims 1 and 5; – at least one third block [block (3)] complying with formula (IV):
(IV) wherein n, R1 to R4, have the meanings defined in Claims 1 and 6; and – optionally, at least one fourth block [block (4)] comprising a PFPE chain; with the proviso that, in copolymer (PF): - the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; - the sum of (m+f) is at least 1, preferably from 1 to 100;
SSPI 2022/021 - the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; and - said at least one block (1), said at least one block (2), said at least one block (3) and, when present, said at least one block (4) are statistically distributed. Claim 15. A block copolymer [copolymer (PO-O)] comprising a first and a second perfluoropolyether chain [PFPE chain], wherein each of said first and second PFPE chain is a chain (Rf) as defined above or is a chain (RfO-O) wherein (RfO-O) is a repeating units complying with any one of formulae (i) to (v) as defined above for (R°) and having a peroxidic content (PO), defined as grams of active oxygen (Mw = 16) in 100 g of PFPE peroxy between 0.1 and 4, preferably between 0.1 and 3.5, each of said first and second PFPE chain having two chain ends, wherein the first chain end of each one of said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -C(=O)F and -OC(=O)F; and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I): -[CR100R101-CR102R103]L^-(D)L- (I) wherein L^, L, D, R100, R101, R102 and R103 have the meanings defined in Claims 1 and 4; – at least one second block [block (2)] complying with formula (II):
wherein m, R5 to R8, have the meanings defined in Claims 1 and 5; – at least one third block [block (3)] complying with formula (IV):
(IV) wherein n, R1 to R4, have the meanings defined in Claims 1 and 6; and – optionally, at least one fourth block [block (4)] comprising a PFPE chain as defined above; with the proviso that * in copolymer (PO-O) – said block (1), said block (2), said block (3) and, when present, said at least one block (4) are statistically distributed, – the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; – the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; – the sum of (m+f) is at least 1, preferably from 1 to 100.
SSPI 2022/021 Claim 16. A block copolymer [copolymer (PF-O-O)] comprising comprising a first and a second perfluoropolyether chain [PFPE chain], wherein each of said first and second PFPE chain is a chain (Rf) as defined above or is a chain (RfO-O) wherein (RfO-O) is a repeating units complying with any one of formulae (i) to (v) as defined above for (R°) and having a peroxidic content (PO), defined as grams of active oxygen (Mw = 16) in 100 g of PFPE peroxy between 0.1 and 4, preferably between 0.1 and 3.5, each of said first and second PFPE chain having two chain ends, wherein the first chain end of each one of said first and second PFPE chain is a chain end of copolymer (P) and each one comprises a group selected from a perfluorinated linear or branched alkyl chain comprising from 1 to 6 carbon atoms, -COOH and salts thereof with an organic cation, preferably onium cation, more preferably ammonium, or an inorganic cation, preferably an alkaline metal, more preferably Na+, K+; -COOR with R being as defined above; -COF; -CON(R300)(R301) wherein each of R300 and R301 are a hydrogen atom or have the same meanings defined for R; -(R)cOH with c being 0 or 1 and R being as defined above; -C(O)-O-C(O)R with R being as defined above; -Br; -CN2; and the second chain ends of said first and second PFPE chain are bonded to each other via: – at least one first block [block (1)] complying with formula (I): -[CR100R101-CR102R103]L^-(D)L- (I) wherein L^, L, D, R100, R101, R102 and R103 have the meanings defined in Claims 1 and 4; – at least one second block [block (2)] complying with formula (II):
wherein m, R5 to R8, have the meanings defined in Claims 1 and 5; – at least one third block [block (3)] complying with formula (IV):
(IV) wherein n, R1 to R4, have the meanings defined in Claims 1 and 6; and – optionally, at least one fourth block [block (4)] comprising a PFPE chain as defined above;with the proviso that * in copolymer (PF-O-O) – said block (1), said block (2), said block (3) and, when present, said at least one block (4) are statistically distributed, – the sum of (n+b) is at least 1, preferably from 1 to 15, more preferably from 1 to 11, even more preferably from 1 to 9; – the sum of (L+L^+e^+e*) is at least 1, preferably from 1 to 500, more preferably from 2 to 500, more preferably from 2 to 300; – the sum of (m+f) is at least 1, preferably from 1 to 100.
SSPI 2022/021 Claim 17. A mixture [mixture (M1)] comprising at least one copolymer (P) as defined in any one of Claims 1 to 6, and at least one of said PFPE peroxy as defined in Claim 9 and/or one or more of copolymers (PO-O) as defined in Claim 15. Claim 18. A mixture [mixture (M2)] comprising at least one copolymer (PF) as defined above, and at least one of at least one of copolymer (P) as defined in any one of Claims 1 to 6, said PFPE peroxy as defined in Claim 9, said one or more copolymers (PO-O) as defined in Claim 15, and/or said one or more copolymers (PF-O-O) as defined in Claim 16.
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