Abstract: Use of fluorinated polymers based on fluoropolyethers for the preparation of crosslinkable high dry formulations comprising a fluorinated part R.sub.F and optionally an hydrogenated part R.sub.H, not containing groups capable of linking by means of hydrogen bonds to basic acceptors, an hydrogenated part Rh.sub.1 and Rh.sub.2, wherein Rh.sub.1 is equal to or different from Rh.sub.2, and Rh.sub.1 and/or Rh.sub.2 being linking bonds containing at least a functional group capable of linking by means of hydrogen bonds with basic acceptors, the bonds joining the fluorinated part to the hydrogenated part being of ether C--O simple type, the terminals T'.sub.a and T" being such as to render the structure mono-, bi- or polyfunctional, and subsequent crosslinking of the fluorinated polymer, the monofunctional products being always in admixture with a resin having even a higher functionality than the described type; the preferred fluorinated products have the formula:T"--(Rh.sub.2).sub.y (R.sub.H).sub.x --R.sub.F --(R.

Abstract: A method of protecting objects from graffiti using fluorinated polymers based on fluoropolyethers in a dry formulation wherein the fluorinated polymer includes a fluorinated part R.sub.F and optionally an hydrogenated part R.sub.H not containing groups capable of linking to basic acceptors by means of hydrogen bonds, the bonds linking the fluorinated part, derived from (per)fluoropolyethers, to the hydrogenated part being of simple C--O ether type, the T' terminal groups being such as to render the structure bi- or polyfunctional thus making possible the curing reaction, and subsequent curing of the fluorinated polymer.

Abstract: Curing system for fluoroelastomers curable by peroxidic route which comprise iodine comprising as curing agent a bis-olefin having general formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, equal to or different from each other, are H or alkyl C.sub.1 -C.sub.5 ; Z is a linear or branched alkylenic or cycloalkylenic radical C.sub.1 -C.sub.18, optionally containing oxygen atoms, preferably at least partially fluorinated, or a (per)fluoropolyoxyalkylenic radical.

Abstract: Greases comprising a mineral and/or synthetic lubricating oil having an hydrogenated basis, a fluoropolyethereal oil and an organic or inorganic thickening agent, wherein the weight ratio lubricating oil+fluoropolyethereal oil/thickening agent ranges from 97:3 to 80:20 and the weight ratio lubricating oil/fluoropolyethereal oil ranges from 95:5 to 60:40.

Abstract: A process for the surface treatment of materials, which includes applying on the surface of a material an aqueous composition including: (a) an inorganic silicate or colloidal silica present in an amount from 2 to 95% by weight based on the weight of dry product; and (b) a fluoroelastomer based on vinylidene fluoride (VDF) present in an amount from 5 to 98% by weight based on the weight of dry product.

Abstract: Non-ionic compound having the general formula:R.sub.f --L--(OCHR.sub.1 --CHR.sub.2).sub.n --O--L'--R.sub.f' (I)wherein:n is an integer comprised between 4 and 60, preferably between 8 and 30;L and L', equal to or different from each other, can be selected from:--(CFY--CO--O).sub.p R'-- and --(CFY--CO--NH).sub.p R'--wherein: p is 0 or 1; Y can be F or CF.sub.3 ; R' is an alkylic radical C.sub.1 -C.sub.5,R.sub.1, R.sub.2 can be both H or the former one H and the latter CH.sub.3.R.sub.f and R.sub.f', equal to or different from each other, can be perfluoropolyethereal radicals having a number average molecular weight comprised between 250 and 1500, preferably between 400 and 1000; and its use as thickener of aqueous latexes based on fluoropolymers.

Abstract: A fluorination catalyst based on of an amorphous Cr (III) compound and on a compound of another metal selected from Mg, Ca, Sr, Ba, Sc, Ti and Zr, wherein the atomic ratio of Cr/other metal is between 50:1 and 1:1, said compounds are supported on a AlF.sub.3 support and being prepared by impregnating the support with a concentrated aqueous solution containing a soluble Cr (III) salt and a soluble salt of the other metal. The catalyst can be used in gaseous phase reactions.

Abstract: Polytetrafluoroethylene (PTFE) dispersions in an organic solvent, comprising:(A) from 2 to 40% by weight of PTFE in powder form;(B) from 50 to 95% by weight of an organic solvent;(C) from 0.5 to 10% by weight of a dispersing agent of formula:(R.sub.H -L).sub.y -(R.sub.F -L).sub.x R.sub.H (I)whereinx is an integer from 1 to 3;y is 0 or 1, with the proviso that x=1 when y=1;R.sub.H is a x-functional radical having an alkylic or polyoxyalkylenic structure;R.sub.F is (per)fluoropolyoxyalkylenic radical;L is a divalent organic group.Such dispersions are utilized for the surface treatment of metals, glass fibers, and the like, and in particular as mould release agents.

Abstract: Triazines having general formula: ##STR1## wherein: X can independently be hydrogen, chlorine, fluorine, C.sub.1 -C.sub.3 alkyl or perfluoro alkyl, n is comprised between 2 and 20.

Abstract: Separation process of bifunctional macromolecules having hydroxylic termination from non functional and/or monofunctional macromolecules having hydroxylic termination contained in admixture in perfluoropolyoxyalkylenes (I) comprising the following phases:addition of the macromer (I) to a suspension of stationary phase in polar solvent, said stationary phase being formed by a compound containing sites and/or active groups, capable of establishing bonds or interactions of polar type, or hydrogen bonds, with the hydroxylic terminals of the perfluoropolyoxyalkylenes contained in the mixture of formula (I), the macromer/stationary phase ratio ranging from 2/3 to 1/1 w/w; solvent/(stationary phase+macromer) ratio ranging from 0.8/1 to 1.

Abstract: Compounds comprising a peroxide and a peroxide curable blend essentially consisting of hydrocarbon elastomers containing at least an acrylic monomer and of fluorinated VDF-based elastomers having in the polymer chain at least 5% by moles of hydrogenated groups C.sub.1 of the type ##STR1## --CH.sub.2 -- and/or --CH.sub.3, the amount of fluorinated rubber in the elastomeric blend being comprised from 5 to 75% by weight, said elastomers of the blend not containing iodine and/or bromine.

Abstract: Curing systems for fluoroelastomers curable by peroxidic route which comprise bromine, optionally iodine, the bromine always being higher than iodine, comprising as essential elements:(I) a curing agent comprising a bis-olefin having general formula: ##STR1## wherein: R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, equal to or different from each other, are H or alkyl C.sub.1 -C.sub.5 ; Z is a linear or branched alkylenic or cycloalkylenic radical C.sub.1 -C.sub.18, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylenic radical.(II) a metallorganic hydride of formula: ##STR2## wherein: M is selected from Sn, Si, Ge, Pb; x is an integer from 1 to 3; y, z are zero or integers from 1 to 3, with the proviso y+z=4-x; w is an integer from 1 to 3; the R groups, equal to or different from each other, are selected from: alkyls C.sub.1 -C.sub.4, aryls C.sub.6 -C.sub.12, arylalkyls and alkylaryls C.sub.7 -C.sub.14, optionally containing nitrile and/or hydroxyl groups.

Abstract: Perfluoropolyethereal compounds having polycarbonate structure, and general formula: ##STR1## wherein c is an integer comprised between 0 and 10, preferably between 0 and 3,n is an integer from 2 to 1,000, extremes included,Rf is a poly-fluorooxyalkylenic chain, having number average molecular weight (Mn) comprised between 500 and 10,000.

Abstract: Use of amino derivatives supported on inert supports in fluorinated fluids utilized in devices subjected to high specific energies to reduce to levels lower than the toxicity limits the toxic decomposition products of said fluorinated fluids.

Abstract: The present invention relates to compositions based on elastomeric polymers of vinylidene fluoride, hexafluoropropene and optionally tetrafluoroethylene suitable for providing microcellular foamed vulcanized articles by extrusion or compression molding. In the case of the production of extruded articles based on vinylidene fluoride and hexafluoropropene copolymers, the compositions comprise: the copolymer, bisphenol AF, a quaternary phosphonium or aminophosphonium salt, azodicarbonamide, MgO, Ca(OH).sub.2, zinc stearate and a plasticizer, each of the components being contained in an exactly defined proportion.

Abstract: Use of amorphous perfluoropolymers based on homopolymers of the TTD dioxole or its amorphous copolymers to prepare solutions in fluoro-containing solvents, to obtain solutions for coatings, wherein TTD has the formula: ##STR1## wherein R.sub.F is a perfluoroalkylic radical with 1-5 carbon atoms, linear or branched when possible; X.sub.1 and X.sub.2 equal to or different from each other being F or CF.sub.3 ; the TTD amount ranges from 40 to 100% by moles.

Abstract: 1,1,1,2-tetrafluoroethane (134a) is prepared by reacting, in the gas phase, trichloroethylene with 1,1,1-trifluorochloroethane (133a) and hydrofluoric acid with trichloroethylene/133a molar ratios ranging from 5/95 to 50/50, in the presence of a catalyst consisting of Cr.sub.2 O.sub.3 carried on AlF.sub.3.The process provides 134a yields higher than 90% and permits an exceptionally long life of the catalyst. In this way it is possible to realize a continuous process by recycling the unreacted trichloroethylene and 133a, thereby making up for the relatively low global conversion of the reagents.

Abstract: The invention relates to a process for preparing perhaloethers from perhaloolefins and to a few "per se" new classes of perhaloethers thereby obtained.The process consists in reacting a perhalomonoolefin with a fluoroxy compound R.sub.x --OF (wherein R.sub.x represents a perhalogenated alkyl radical) at a temperature not exceeding 20.degree. C. in a liquid reaction medium and in the presence of inert gases.

Abstract: Method of preparation of concentrated aqueous compositions based on fluoroelastomers, capable of giving a coating having a high thickness for each passage on the surface to be protected, consisting in the milling of the additives at the powder state directly into the latex of the fluoroelastomer.

Abstract: Fluoroelastomers substantially free from polar end groups, comprising vinylidene fluoride (VDF) and/or tetrafluoroethylene (TFE) and at least another fluorinated ethylenically unsaturated monomer. They are characterized by an high thermal stability, an optimal processability and curing easiness, without giving rise to pre-crosslinking phenomena and moreover they do not require prolonged post-curing treatments. Such flurooelastomers are advantageously prepared by copolymerization of the corresponding monomers in aqueous emulsion in the presence of ultraviolet-visible radiation (UV-VIS) and of an organic peroxide.