Abstract: Use for the preparation of paints for substrata coatings of aqueous dispersions of VDF-based polymers having an average particle size between 0.260 and 0.3 micrometers comprising a bifunctional surfactant of formula: A-Rf-B ??(I) wherein A=—O—CFX—COOM; B=—CFX—COOM with X=F, CF3; M=NH4, alkaline metal, H; Rf is a linear or branched perfluoroalkyl chain, or a (per)fluoropolyether chain such that the number average molecular weight of (I) is in the range 600-800.

Abstract: Processes for the preparation of perfluoropolyethers having structural formula R1O—(CF2O)n—(CF2CF2O)mR2??(I) wherein: R1 is —CH3 or —C2H5; R2 is equal to R1 or —CF2H n is 0 or an integer from 1 to 100; m is an integer from 1 to 100 or, when R2 is —CF2H, m can also be 0; the oxyfluoroalkylene units —(CF2CF2O)— and —(CF2O)— are statistically distributed along the polymer chain.

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: Carboxylic acids comprising perfluoropolyether chains, of formula: T1—CFW1—O—Rf—CFW2—T2??(I) wherein T1, T2, equal to or different from each other, are selected from the group formed of —CH2—B—Y—(COOH)n, —CH(CF3) O—Y(COOH)n, —F, —CF3, —C2F5, —(C2F4)Cl, wherein B=—O— or —S—; Y=C1—C20 alkylene chain, n=1-4; with the proviso that at least one of the two end groups T1, T2 be —CH2—B—Y—(COOH)n, —CH(CF3)O—Y(COOH)n; W1, W2, equal to or different from each other, are —F or —CF3; Rf is a (per)fluoropolyoxyalkylene chain formed of one or more repeating units, statistically distributed along the chain, having a number average molecular weight in the range 500-10,000.

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: Aqueous compositions of (per)fluoropolyether phosphates of formula: T—O—[Rf—CFY—L—O]P(O)(O?Z+)(OH); ??(A) and/or (OH)m(O?Z+)2-mP(O)[O—L—YFC—O—Rf—CFY—L—O—P(O)(O?Z+)]m?——[O—L—YFC—O—Rf—CFY—L—O]P(O)(O?Z+)2-m(OH)m ??(B) and use thereof to confer oleo-repellence to the paper by means of the size-press method.

Abstract: Perfluoropolyethers having structural formula R1O—(CF2O)n—(CF2CF2O)mR2??(I) wherein: R1 is —CH3 or —C2H5; R2 is equal to R1 or —CF2H n is 0 or an integer from 1 to 100; m is an integer from 1 to 100 or, when R2 is —CF2H, m can also be 0; the oxyfluoroalkylene units —(CF2CF2O)— and —(CF2O)— are statistically distributed along the polymer chain.

Abstract: Perfluoropolyethers having structural formula R1O—(CF2O)n—(CF2CF2O)mR2??(I) wherein: R1 is —CH3 or —C2H5; R2 is equal to R1 or —CF2H n is integer from 1 to 100; m is an integer from 1 to 100 or, when R2 is —CF2H, in can also be 0; the oxyfluoro-alkylene units —(CF2CF2O)— and —(CF2O)— are statistically distributed along the polymer chain.

Abstract: Use for the preparation of paints for substrata coatings of aqueous dispersions of VDF-based polymers having an average particle size between 0.260 and 0.3 micrometers comprising a bifunctional surfactant of formula: A-Rf-B ??(I) wherein A=-O—CFX—COOM; B=—CFX—COOM with X=F, CF3; M=NH4, alkaline metal, H; Rf is a linear or branched perfluoroalkyl chain, or a (per)fluoropolyether chain such that the number average molecular weight of (I) is in the range 600-800.

Abstract: Mixtures of fluoropolymer dispersion, wherein: a) a dispersion is formed by TFE (co)polymers with average particle sizes in the range 180–400 nm; b) another dispersion selected from: 1) (co)polymer dispersion of TFE; 2) thermoplastic copolymers of TFE; the average particle sizes of dispersion b) range from 20 to 60 nm; the ratio between the particle sizes of dispersion b) compared with those of dispersion a) is lower than 0.3.

Abstract: Perfluoropolyethers having structural formula R1O—(CF2O)n—(CF2CF2O)mR2??(I) wherein: R1 is —CH3 or —C2H5; R2 is equal to R1 or —CF2H n is 0 or an integer from 1 to 100; m is an integer from 1 to 100 or, when R2 is —CF2H, m can also be 0; the oxyfluoro-alkylene units —(CF2CF2O)— and —(CF2O)— are statistically distributed along the polymer chain.

Abstract: Perfluoropolyethers having structural formula R1O—(CF2O)n—(CF2CF2O)mR2??(I) wherein: R1 is —CH3 or —C2H5; R2 is equal to R1 or —CF2H n is 0 or an integer from 1 to 100; m is an integer from 1 to 100 or, when R2 is —CF2H, m can also be 0; the oxyfluoroalkylene units —(CF2CF2O)— and —(CF2O)— are statistically distributed along the polymer chain.

Abstract: Fluoropolymer aqueous dispersions having particles with average diameters from 150 to 400 nm, comprising bifunctional fluorinated surfactants having formula: A-Rf—B??(I) wherein: A and B, equal to or different from each other, are: —(O)pCFX—COOM; M=NH4, alkaline metal, H; X=F, CF3; p is an integer equal to 0 or 1; Rf is a linear or branched perfluoroalkyl chain, or a (per)fluoropolyether chain such that the number average molecular weight of (I) is in the range 300-1,800.

Abstract: Carboxylic acids comprising perfluoropolyether chains, of formula: T1-CFW1—O—Rf—CFW2-T2 ??(I) wherein T1, T2, equal to or different from each other, are selected from the group formed of —CH2—B—Y—(COOH)n, —CH(CF3) O—Y(COOH)n, —F, —CF3, —C2F5, —(C2F4)Cl , wherein B=—O—or —S—; Y=C1—C20 alkylene chain, n=1-4; with the proviso that at least one of the two end groups T1, T2 be —CH2—B—Y—(COOH)n, —CH(CF3)O—Y(COOH)n; W1W2, equal to or different from each other, are —F or —CF3; Rf is a (per)fluoropolyoxyalkylene chain formed of one or more repeating units, statistically distributed along the chain, having a number average molecular weight in the range 500-10,000.

Abstract: Method for removing water from surfaces of various materials, comprising the steps of covering said surface with a composition having specific weight higher than that of water and subsequently removing water from the composition by skimming, wherein a composition essentially consisting of the following components is used: a fluorinated non ionic additive component A) of formula: T-ORf(CFY)-L  (I) a (per)fluoropolyether component B), wherein the ratio by weight (K) between the (per)fluorinated part and the hydrogenated L part of the additive is in the range 1.50-4.00 and the ratio KI between the number average molecular weight of the fluoropolyether part T-ORf— of the additive and the number average molecular weight of the component B) is higher than 1.60.

Abstract: Use for improving the hydro- and oil-repellence properties of substrata having a low surface energy of (per)fluoropolyether mono- and bifunctional derivatives having the structures: W—L—YFC—O—Rf—CFY—L—W  (I) Rf—CFY—L—W  (II) wherein: L is a linking organic group —CO—NR′—(CH2)q—, with R′═H or C1-C4 alkyl; q is comprised between 1 and 8; Y═F, CF3; W is a —Si(R1)&agr;(OR2)3-&agr; group with &agr;=0,1,2, R1 and R2 equal to or different from each other are C1-C6 alkyl groups, C6-C10 aryl groups, C7-C12 alkyl-aryls or aryl-alkyls; Rf has a number average molecular weight in the range 200-5,000 and comprises repeating units having at least one of the following structures: (CFXO), (CF2CF2O), (CF(CF3)CF2O), (CF2CF(CF3)O), wherein X═F, CF3.

Abstract: Aqueous compositions of (per)fluoropolyether phosphates of formula: T—O—[Rf—CFY—L—O]P(O)(O−Z+)(OH); and/or  (A) (OH)m(O−Z+)2-mP(O)[O—L—YFC—O—Rf—CFY—L—O—P(O)(O−Z+)]m′— —[O—L—YFC—O—Rf—CFY—L—O]P(O)(O−Z+)2-m(OH)m  (B) and use thereof to confer oleo-repellence to the paper in bulk by means of the wet-end method.

Abstract: Mixtures of fluoropolymer dispersions comprising: a) one or more dispersions constituted by TFE homopolymers or by its copolymers with particle average sizes ranging from 180 to 400 nm; b) one or more TFE copolymer dispersions with one or more monomers containing at least one ethylene unsaturation, the comonomer amount being such that the dispersion contains a number of fibrils lower than 10% of the total number of particles; said fibrils being polymer particles having a length/diameter (L/D) ratio higher than 5; the dispersion particle average sizes are smaller of about 90 nm; the component b) contains a comonomer amount such that the resulting polymer is not elastomeric and furthermore it shows composition and viscosity characteristics of the melt such as not to be thermoprocessable.

Abstract: Fluoropolymer aqueous dispersions having particles with average diameters from 150 to 400 nm, comprising bifunctional fluorinated surfactants having formula:

Abstract: Use in etching or polishing of integrated circuits of fluorinated additives of formula (I):