Ausimont S.p.a.

Solvay Specialty Polymers Italy S.p.a.

Solvay Solexis S.p.a.

Ausimont S.r.l.

Syensqo Specialty Polymers Italy S.p.a.

Ugo De Patto

Giuseppe Marchionni

Marco Avataneo

Ezio Strepparola

Gian Tommaso Viola

Pier Antonio Guarda

Mirko Tavano

Mario Padovan

Guglielmo Gregorio

Liubov Chernysheva

Andrea Lotierzo

The invention pertains to a method of making fluoropolymer dispersions using certain polyfunctional perfluoropolyether derivatives including a plurality of ionisable groups selected from the group consisting of —SO.sub.3X.sub.a, —PO.sub.3X.sub.a and —COOX.sub.a, whereas X.sub.a is H, an ammonium group or a monovalent metal, and whereas said groups are comprised as pendant groups in the perfluoropolyether chain, and to fluoropolymer dispersions therefrom.

Method for making fluoropolymers

The invention pertains to a method of making fluoropolymer dispersions using certain polyfunctional perfluoropolyether derivatives including a plurality of ionisable groups selected from the group consisting of &#x2014;SOX, &#x2014;POXand &#x2014;COOX, whereas Xis H, an ammonium group or a monovalent metal, and whereas said groups are comprised as pendant groups in the perfluoropolyether chain, and to fluoropolymer dispersions therefrom.

The invention pertains to a (per)fluoroelastomer composition comprising: &#x2014;a (per)fluoroelastomer [fluoroelastomer (A)]; and &#x2014;at least one (per)fluoropolyether additive [polymer (E)] comprising a (per)fluoropolyether chain comprising recurring units having at least one catenary ether bond and at least one fluorocarbon moiety, and comprising at least one chain end comprising at least one per(halo)fluorinated aromatic group [group (Ar)], said polymer (E) being comprised in the composition in an amount of 0.5 to 30 phr, with respect to fluoroelastomer (A).

Fluoroelastomer compositions

A process for preparing perfluoropolyethers of formulaT-O&#x2014;(R)-T'&#x2003;&#x2003;(I)wherein:

Method for preparing carbonylic perfluoropolyethers

Hydrofluoro alcohols of formula (I): A-(R)&#x2014;CFX&#x2014;O&#x2014;RO&#x2014;(CFX&#x2014;(R)&#x2014;CFX&#x2014;O&#x2014;RO&#x2014;)H in which: Ris a hydrocarbon-based chain; X is F or a C-C(per)fluoroalkyl; a or a* is 0 or 1; Ris a (per)fluoro(poly)oxyalkylene chain or a (per)fluoroalkyl chain; A is selected from the group consisting of &#x2014;F, &#x2014;Cl, and &#x2014;H (possible only when a=1) or is HO&#x2014;R&#x2014;O&#x2014;CFX&#x2014;; n is an integer from 0 to 200, with the condition that n=0 when A is selected from the group consisting of &#x2014;F, &#x2014;Cl, and &#x2014;H.

Hydrofluoroalcohols with improved thermal and chemical stability

A process for preparing monocarboxylic perfluoropolyethers of formula: A-O&#x2014;(R)&#x2014;(CFY)&#x2014;C(O)OX (I) wherein: X is H, C-Calkyl, or an aryl group; Y=F, CF; t=1, 2 or 3; A is a C-Cperfluoroalkyl end group; z=0 or 1; Ris a perfluorooxyalkylene chain; having a number average molecular weight in the range 180-8,000; comprising the following steps: a) one or more distillations of perfluoropolyethers (PFPE) of formula T-O&#x2014;(R)-T' (II) wherein: z and Rare as above defined; T, T&#x2032;, equal to or different from each other, are selected from acyl fluoride or carbonyl-containing functional end groups and non functional end groups to obtain one PFPE fraction of formula (II) wherein the difference between the minimum and the maximum molecular weight of the components is lower than or equal to 600; b) partial fluorination of the fraction obtained in a); c) esterification c1) and/or hydrolysis c2) of the mixture obtained in b); d) distillation of the product obtained in c2) or in c1).

Process for preparing high purity monocarboxylic perfluoropolyethers

Perfluoropolyethers obtained by oxidation of perfluorodioxoles of formula (I) wherein R=&#x2014;F, &#x2014;(O)CFwith y=0, 1 and n=1, 2, 3, 4, 5, and with W=&#x2014;F, &#x2014;CF,optionally in the presence of tetrafluoroethylene and/or hexafluoropropene, and subsequent reduction of the obtained peroxidic perfluoropolyethers.

Perfluoropolyethers comprising repeating units obtained from oxidation of perfluorodioxoles

A liquid-liquid extraction process of ketones, alcohols, aldehydes, alkyl esters of carboxylic acids, carboxylic acids, ethers, amines and heterocyclic compounds, from their aqueous solutions, comprising the addition under stirring to said aqueous solutions of a fluorinated extracting liquid selected from

Liquid-liquid extraction of polar organic substances from their aqueous solutions with fluorinated extracting liquids

Perfluoropolyether lubricant containing sulphonylfluoride groups

A process for preparing functionalized perfluoropolyoxyalkylenes, wherein the corresponding perfluoropolyoxyalkylenes containing peroxy bonds in the chain are reacted with a primary or a secondary alcohol, or mixtures of these alcohols, in the presence of a catalyst selected from iodine, hydriodic acid or alkali metal iodides. The process leads to the obtainment of perfluoropolyoxyalkylenes having a high functionalization degree, which can be easily purified by removing the excess of alcohol through distillation.

Process for preparing functionalized perfluoropolyoxyalkylenes

Perfluoropolyoxyalkylenes containing acid and/or ketonic groups are neutralized by reacting same in the liquid phase with elemental fluorine at temperatures of from -20.degree. to +150.degree. C. in the presence of a supported catalyst consisting of fluorides of Ag, Pb, Co, Ni, Cu, Mn, V, Cr, or Fe. In a preferred embodiment, a mixture of fluorides of the above mentioned metals and of fluorides, or fluoride precursors, of an alkali and/or alkaline-earth metal is used as catalyst, optionally supported on a suitable carrier.

Process for the neutralization of perfluoropolyoxyalkylenes

Perfluoropolyethers having fluorinated epoxy groups positioned along their perfluoropolyether chain, and free from peroxidic oxygen, are obtained by means of a low-temperature oxidation process, in the liquid phase, with molecular oxygen and in the presence of U.V. light, of a mixture of a perfluorinated monoolefin and a perfluorinated coniugated diene, and of the subsequent photochemical decomposition of the peroxy groups contained in the photoxidation product, carried out by treating the peroxy-groups-containing product with U.V. light at a temperature comprised within the range of from 0.degree. C. to 160.degree. C. Derivatives of said epoxy containing perfluoropolyethers in which the epoxy groups have been turned into functional groups.

Perfluoropolyethers free from peroxidic oxygen and containing

This invention relates to a process for preparing fluoropolyethers and perfluoropolyethers having neutral and/or functional end groups and a lower molecular weight by a selective catalytic cleavage of the corresponding higher molecular weight fluoropolyethers and perfluoropolyethers, characterized in that said cleavage is carried out by operating in the presence of a catalyst system consisting of a combination of silicon dioxide with at least an oxide, a fluoride or an oxyfluoride of a metal selected from Al, Ti, V, Cr, Co. Fe, Ni, Mo, Zn, Cu, Cd, Mn, Sb, Sn, Zr, Sc, Y, La and homologs thereof, Pb, Mg, W.

Process for preparing fluoropolyethers and perfluoropolyethers having

Perfluoropolyethers having fluorinated epoxy groups positioned along their perfluoropolyether chain, and free from peroxidic oxygen, are obtained using a low-temperture oxidation process, in the liquid phase, with molecular oxygen and in the presence of U.V. light, of a mixture of a perfluorinated monoolefin and a perfluorinated conjugated diene, and of the subsequent photochemical decomposition of the peroxy groups contained in the photoxidation product, carried out by treating the peroxy-groups-containing product with U.V. light at a temperature within the range of from 0.degree. C. to 160.degree. C. Derivatives of said epoxy containing perfluoropolyethers in which the epoxy groups have been turned into functional groups.

Improved process for producing perfluoropolyethers prevailingly constituted by repeating units

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Cogliate, Italy

Ugo De Patto