Abstract: Process for obtaining dilute aqueous solutions containing an amount of <7% by weight, expressed as a percentage by weight of imidoalkanepercarboxylic acids, starting with concentrated aqueous compositions of the said peracids in the ? form, the said concentrated compositions being obtained from the imidoalkanepercarboxylic acids in the ?-crystal form, the said process comprising the following steps: I) dilution of the concentrated aqueous composition of imidoalkanepercarboxylic acids (C) with an aqueous solution (D) having a pH of between 2 and 5, in a (C):(D) proportion, expressed in parts by weight, of between 0.1:10 and 10:0.2, working at temperatures of between 4° C. and 30° C.

Abstract: Peroxidic perfluoropolyethers having formula: X1—O(CF2O)n1(CF2CF2O)m1(CF2(CF2)zCF2O)p1(O)h—X2 ??(I) wherein: X1 and X2, equal to or different from each other, are chain end groups selected among —CF2COF, —COF, —SO2F; n1, m1, p1 and h are integers such that the number average molecular weight is in the range 700-100,000; z=1 or 2; with the proviso that: the m1/n1 ratio is between 0.2 and 10; the p1/(n1+m1) ratio is lower than 0.05; the h/(n1+m1+p1) ratio is such that the PO content, defined as grams of active oxygen/100 g of compound, is in the range 0.8-4.5, preferably 1.4-3.8; the perfluorooxyalkylene units being statistically distributed along the polymeric chain.

Abstract: A crosslinking system of perfuoroelastomers curable by peroxidic way comprising: as crosslinking agent, a bis-olefin having general formula: wherein: R1, R2, R3, R4, R5, R6, equal to or different from each other, are H or C1-C5 alkyls; Z is a C1-C18 linear or branched alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical; the bis-olefin amount, expressed in per cent by weight on the total of polymer, being from 0.6% to 1.8%; peroxides for the peroxidic curing, capable to generate radicals by heating, in an amount from 0.2% to 1.3% by weight on the polymer.

Abstract: Compounds of formula wherein Rf is a (per)fluoropolyoxyalkylene chain having a number average molecular weight in the range 500-10,000; W1, W2, equal to or different from each other, are —F or —CF3; T1 is equal to —CHAa—Ba (CH2CH2O)na— wherein Aa=H, CF3; Ba=O, S, NH; na=0 or an integer between 1 and 6; T2 is equal to —F, —CF3, —C2 F5, —(C2 F4) Cl, or a group of formula: Q1, Q2 equal to or different from each other, are a chain of formula -T1-l -CFW1—O—Rf—CFW2-T?2, wherein: T?2 is equal to —F, —CF3, —C2 F5, —(C2F4) Cl; or is a group of formula: wherein B is equal to O, S, NH; R1, R2, R3, R4, R5 equal to or different from each other are selected from H, F, NO2, CN, C1-C8 perfluoroalkyl, carboxyl, phenyl (Ph), O- Ph, NH-Ph, S-Ph; wherein B is equal to O, S, NH; R1, R2, R3, R4, R5 equal to or different from each other are selected from H, F, NO2, CN, C1-C8 perfluoroalkyl, carboxyl, phenyl (Ph), O- Ph, NH-Ph, S-Ph; with the proviso that at least one of Q1 and Q2a is equal to:

Abstract: Ionomeric membranes comprising (per)fluorinated, se-micrystalline or amorphous, ionomeric polymers, having equivalent weight (EW) from 380 g/eq to 1,800 g/eq, which used in fuel cells, under the following conditions: membrane thickness 50 ?m assembled between two electrodes catalyzed with 0.6 mg/cm2 Pt/C and treated with 0.7 mg/cm2 of Nafion®, having a 10 cm2 area; hydrogen and air feeding, both at the pressure of 0.25 MPa, both saturated with water at 80° C.; cell temperature 75° C.; for membranes formed of copolymers TFE/F2C?CF—O—(CF2)2—SO2F, give the following maximum specific power (PMAX) values, at the indicated EW values: at EW=670 PMAX higher than 0.55 Watt/cm2; at EW=830 PMAX higher than 0.66 Watt/cm2; at EW=1,160 PMAX higher than 0.50 Watt/cm2; at EW=1,600 PMAX higher than 0.32 Watt/cm2.

Abstract: Compounds formed of (per)fluoropolyether chains and end groups having a pyridine structure, with structural formula: T1-CW1—O—Rf—CW2-T2??(I) wherein T1, T2, equal to or different from each other, have the following meanings: F, CF3, C2F5, (C2F4)Cl; CH2—B—Y, CH(CF3)O—Y, wherein: B?O, S; wherein R1, R2, R3, R4, equal to or different from each other, are H, F, C1-C8 linear or branched perfluoroalkyl, NO2, CN; with the proviso that at least one of the two end groups T1, T2 is CH2—B—Y or CH(CF3)O—Y as above defined; W1, W2, equal to or different from each other, are —F, —CF3; Rf is a (per)fluoropolyoxyalkylene chain having a number average molecular weight from 400 to 10,000.

Abstract: The invention pertains to a multi-phase thermoplastic fluoropolymer composition, comprising a thermoplastic fluoropolymer and discrete domains of melt-processable perfluoropolymer, to the articles therefrom and to a process for manufacturing thermoplastic fluoropolymer compositions. The multi-phase thermoplastic fluoropolymer composition comprises: —at least one thermoplastic fluoropolymer (A); and —from 0.1 to 10% by weight of (A) of at least one melt-processible perfluoropolymer (B), and is characterized in that the polymer (B) is present in the composition in phase-separated domains in a continuous phase mainly comprising (A), at least 75% by volume of said domains having maximal dimension not exceeding 1 ?m. The process of the invention comprises mixing: (i) a thermoplastic fluoropolymer (A); (ii) a melt-processible perfluoropolymer (B) under the form of particles having an average primary particle size not exceeding 300 nm; (iii) and optionally other additives or filling materials.

Abstract: (Per)haloethers having formula: X-(Rf)L-O—CF2CF2—O—CX1X2—CFX3X4 , ??(I) process for obtaining them and hypofluorites usable in the synthesis of said (per)haloethers.

Abstract: Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA): wherein R?F is equal to RF or ORF wherein RF is a linear or branched perfluoroalkyl radical having 1-5 carbon atoms; X1 and X2, equal to or different from each other, are F, CF3; said polymers having a dioxole content?95% by moles, having the following property combination: Tg, measured according to the ASTM 3418 (DSC) method, from 180° C. to 195° C.; intrinsic viscosity, measured at the temperature of 30° C. in perfluoroheptane (Galden® D80) according to the ASTM D 2857-87 method, from 13 cc/g to 100 cc/g.

Abstract: Imidoalkancarboxylic acids of formula: are described, wherein A, X and M are as defined in the application, said acids being in a crystalline form which in contact with water gives rise to crystals having sizes lower than 30 micron.

Abstract: Use in optical systems as liquids to transmit light at wave lengths lower than 250 nm, in particular at 157 nm, of perfluoropolyethers having the following formula: X1—O(CF2O)n(CF2CF2O)m(CF2CF2CF2O)p(CF2CF2CF2CF2O)q—X2??(I) wherein: the repeating units —CF2O—, —CF2CF2O—, —CF2CF2CF2O—, —CF2CF2CF2CF2O— are statistically distributed along the chain; —X1 and —X2 are perfluoroalkyl chain end groups equal to or different from each other, having formula —(CF2)zCF3 wherein z is 0 or an integer from 1 to 3; n, m, p, q are 0 or integers comprised between 1 and 100, with the proviso that: at least one among n, m, p and q is different from zero; the ratio between the oxygen atoms and the carbon atoms (O/C) is higher than 0.33; wherein the chlorine atoms, determined by 19F-NMR are substantially absent.

Abstract: A process for the synthesis of (per)fluorinated mono-functional carbonyl compounds having the following formula (I): F-A-RF—B—C(O)X1??(I) wherein: X1=F, CF3; A, B equal to or different from each other, are independently (per)fluoroalkylene or (per)fluorooxyalkylene groups; RF is —ORf1O— wherein Rf1=perfluoroalkylene or —ORf2, wherein Rf2 is a perfluorooxyalkylene chain; said process comprising the following steps: A) obtainment of the formula (II) mono-hypofluorite: FO—CFX2-A-RF—B—C(O)X1??(II) by partial fluorination with elemental fluorine of the carbonyl groups of the formula (III) compound: X2(O)C-A-RF—B—C(O)X1??(III) in the presence of a formula MeFy catalyst, Me being an alkaline or alkaline-earth metal or Ag, y=1 or 2; B) thermal decomposition of the compound (II) to give the compounds according to the following scheme: FO—CFX2-A-RF—B—C(O)X1 (II) - - - ?F-A-RF—B—C(O)X1 (I)+(O)CFX2.

Abstract: Peroxidic perfluoropolyethers having formula: X1—O(CF2O)n1(CF2CF2O)m1(CF2(CF2)zCF2O)p1(O)h—X2??(I) wherein: X1 and X2, equal to or different from each other, are chain end groups selected among —CF2COF, —COF, —SO2F; n1, m1, p1 and h are integers such that the number average molecular weight is in the range 700-100,000; z=1 or 2; with the proviso that: the m1/n1 ratio is between 0.2 and 10; the p1/(n1+m1) ratio is lower than 0.05; the h/(n1+m1+p1) ratio is such that the PO content, defined as grams of active oxygen/100 g of compound, is in the range 0.8-4.5, preferably 1.4-3.8; the perfluorooxyalkylene units being statistically distributed along the polymeric chain.

Abstract: Peroxidic perfluoropolyethers having formula: X1—O(CF2O)n1(CF2CF2O)m1(CF2(CF2)zCF2O)p1(O)h—X2 ??(I) wherein: X1 and X2, equal to or different from each other, are chain end groups selected between —CF2COF and —COF; n1, m1, p1 and h are integers such that the number average molecular weight is in the range 700-100,000; z=1 or 2; with the proviso that: the m1/n1 ratio is between 0.2 and 10; the p1/(n1+m1) ratio is lower than 0.05; the h/(n1+m1+p1) ratio is such that the PO content, defined as grams of active oxygen/100 g of compound, is in the range 0.8-4.5, preferably 1.4-3.8; the perfluorooxyalkylene units being statistically distributed along the polymeric chain.

Abstract: A process for the synthesis of (per)fluorinated mono-functional carbonyl compounds having the following formula: F—A—(RF)t—B—C(O)X1??(I) wherein: X1=F, CF3; t=0, 1; A, B equal to or different from each other, are independently C1-C5 (per)fluoroalkylene groups or C1-C5 (per)fluorooxy-alkylene groups; RF is —Rf1—, C1-C20 perfluoroalkylene, —ORf1O—; or —ORf2—, wherein Rf2 is a perfluorooxyalkylene chain; wherein the carbonyl groups of a (per)fluorinated di-functional carbonyl compound of formula (III): X2(O)C—A—(RF)t—B—C(O)X1??(III) wherein: X1, RF, t, A and B have the above meanings; X2, equal to or different from X1, has the same meanings as X1; are partially fluorinated with elemental fluorine in the presence of a catalyst having formula MeFy.zHF, Me being an alkaline or alkaline-earth metal or Ag, y=1 or 2, z an integer from 0 to 4, carrying out said reaction at a temperature higher than a temperature such that it leads to the formation of C(O)FX2.

Abstract: A process for preparing (per)fluorohalogenethers having general formula: wherein: A and A?, equal to our different from each other, are selected among Cl, Br, H; m=1, 2; n=0, 1; R1 is a fluorinated substituent, preferably perfluorinated, selected from the following groups: C1-C20 linear or branched alkylic; C3-C7 cycloalkylic; aromatic, C6-C10 arylalkyl; heterocyclic or C5-C10-alkylheterocyclic; preferably perfluoroalkyl; R? is as defined in the application; by reaction of carbonyl compounds having formula: wherein: R1 and n are as above; u=0, 1; R? is as defined in the application; in liquid phase, with elemental fluorine and with olefinic compounds of formula: CAF?CA?F2??(III) wherein A and A? are as above, at temperatures from ?120° C. to ?20° C., preferably from ?100° C. to ?40° C., optionally in the presence of an inert solvent under the reaction conditions.

Abstract: Use in etching or polishing of integrated circuits of fluorinated additives of formula (I): T?(C3F6O)n(CFXO)mT ??(I) having a number average molecular weight in the range 250–400, in particular of the compound Cl(CF2—CF(CF3)O)nCF2COONa.

Abstract: A process for preparing fluoropolymer dispersions, substantially free from anionic fluorinated surfactants, and with a coagulum amount <0.1% by weight, comprising: a) step a1) addition of: a non ionic surfactant having cloud point (CP) between 40° and 80° C., in an amount from 1.5% to 50% by weight on the dispersion fluoropolymer; and optionally an electrolyte to bring the specific conductivity of the dispersion to values in the range 130-8,000 ?S/cm; optionally a buffer agent to have a pH between 2 and 12 to a fluoropolymer dispersion obtainable by an emulsion polymerization process; step a2): heating of the dispersion obtained in a1) up to a temperature Tc in the range CP±10° C.; decantation without stirring, at the temperature Tc, until obtaining the dispersion separation in two aqueous phases, of which the lower one containing the fluoropolymer is discharged; b) step b1): the dispersion obtained in step a2) is optionally additioned of an electrolyte and of a non ionic surfactant as in a1).

Abstract: A process to substantially remove the fluorinated anionic surfactants from fluoropolymer dispersions comprising the following steps: a) addition to the fluoropolymer dispersion of an anionic polyelectrolyte; b) contact of the dispersion with an anionic exchanger; c) separation of the dispersion from the anionic exchanger and recovery of the dispersion substantially fluorinated anionic surfactant free.

Abstract: A process for separating bifunctional perfluoropolyethers (PFPEs) having two terminations —CH2OH from their mixtures with monofunctional PFPEs with one termination —CH2OH, of general formula X1—O—Rf—Y ??(I) wherein Rf is a perfluoropolyoxyalkylene chain having a number average molecular weight of 500-10,000; X1 and Y are end groups selected from —CFXCH2OH (wherein X is F or CF3), —CF3, —CF2Cl, —CF2CF2Cl, —C3F6Cl, —CF2Br, —CF2CF3, wherein at least one of the two end groups is —CFXCH2OH, said process comprising the steps of: a) addition of the PFPE mixture to an adsorbing solid phase, under stirring; b) filtration of the mixture obtained in a): c) addition to the solid phase filtered in b), of a PFPE mixture having an average functionality higher than that of the PFPE mixture of the liquid filtered in b); c2) filtration of the mixture obtained in c); and subsequent treatment of the solid phase separated in c2) with a polar solvent obtaining a liquid containing the PFPE having high functionality.