Abstract: Reversible polymer gels comprising:(a) 55-98% by weight based on the total polymers contained in the gel, of an elastomeric copolymer of vinylidene fluoride comprising, in moles, 55-85% of vinylidene fluoride, 15-45% of hexafluoropropene and 0.30% of tetrafluoroethylene;(b) 2-45% based on the total polymers contained in the gel, of a non-elastomeric polymer selected from non-elastomeric VDF. based polymers, or polyvinylfluoride, or acrylic resins, for example polyalkylmethacrylates and copolymers of alkylmethacrylates with alkylacrylates, having T.sub.g >50.degree. C.

Abstract: Surface portions of metal materials, in particular artifacts which are of interest from historical, artistic or archeological perspectives, are protected from atmospheric agents and pollutants, and are re-aggregated, by reversibly applying a protecting and aggregating material comprising a copolymer of vinylidene fluoride having 55-85 mol % of vinylidene fluoride, 10-45 mol % of hexafluoropropene and 0-30 mol % of tetrafluoroethylene. Such polymers are applied onto the surface to be protected as solutions in volatile solvents.

Abstract: The surface of lapideous materials, marble, sandstone, tiles, cement conglomerates and articles and structures manufactured therefrom are consolidated and protected against atmospherical and polluting agents by superficially applicating a mix composed of:a) a vinylidene fluoride elastomeric copolymer comprising 55-85% by mols of vinylidene fluoride, 15-45% by mols of hexafluoropropene and 0-30% by mols of tetrafluoroethylene;b) polytetrafluoroethylene or a copolymer of tetrafluoroethylene containing up to 12% by mols of other perfluorinated monomers.

Abstract: Reversible polymer gels comprising:(a) 55-98% by weight based on the total polymers contained in the gel, of an elastomeric copolymer of vinylidene fluoride comprising, in moles, 55-85% of vinylidene fluoride, 15-45% of hexafluoropropene and 0-30% of tetrafluoroethylene;(b) 2-45% based on the total polymers contained in the gel, of a non-elastomeric polymer selected from non-elastomeric VDF-based polymers, or polyvinylfluoride, or acrylic resins, for example polyalkylmethacrylates and copolymers of alkylmethacrylates with alkylacrylates, having T.sub.g >50.degree. C.Said polymer gels can be used as protective and consolidating agents for stone materials, for preparing insulating and impermeable films and for impregnating fiber textiles.

Abstract: Surfaces of stone materials, marble, sandstone, bricks, concrete and articles manufactured therefrom are consolidated and protected from atmospheric agents and pollutants by applying onto said surfaces a mixture consisting of:(a) 2-40% by weight of polyvinylidene fluoride, or 1-20% by weight of a polyalkylmethacrylate wherein the alkyl group contains from 1 to 4 carbon atoms;(b) an elastomeric copolymer of vinylidene fluoride, constituting the balance to 100% and being, in moles, 55-85% of vinylidene fluoride, 15-45% of hexafluoropropene and 0-30% of tetrafluoroethylene.

Abstract: Fluoroelastomeric compositions peroxy-curable, endowed with improved characteristics of processability and compatibility, and with enhanced low-temperature properties, comprising, as additives, vinylidene fluoride cotelomers having the general formula:R[(CH.sub.2 CF.sub.2).sub.n (C.sub.3 F.sub.6).sub.m (C.sub.2 F.sub.4).sub.p (C.sub.2 F.sub.3 Cl).sub.q ]X (I)wherein:X=Br, I;R is a possible halogenated alkyl radical;n, m, p, q are integers, m, p, q may also be zero.

Abstract: The present invention relates to a process for protecting stone materials, marble, tiles and cement as well as articles manufactured from these materials from the decay caused by the atmospheric agents and pollutants. The process uses a mixture consisting of:1) polytetrafluoroethylene in the form of an aqueous dispersion,2) an emulsion or a microemulsion of perfluoropolyethers either having or not having functional groups at their ends which is applied onto the surface of the materials or articles.

Abstract: The surfaces of stony materials, tiles, cement conglomerates and relevant manufactured articles are protected from atmospheric agents and pollutants by surface application of a protective material consisting of a mixture comprising a vinylidene fluoride polymer or copolymer containing 55-100 mol % of vinylidene fluoride, 0-45 mole % of hexafluoropropene and 0-30 mol % of tetrafluoroethylene and an aqueous microemulsion or emulsion of perfluoropolyethers. Such mixtures are applied by conventional methods onto the surface to be protected.

Abstract: By means of radicalic starters, fluoroolefins are polymerized in the presence of perfluoropolyethers containing, at one or at both ends, a bromine atom, in such amounts that the weight ratio between the perfluoropolyethers and the fluorinated olefins in the resulting product ranges from 4/1 to 1/50. The bromine-containing perfluoropolyethers utilized in the process have a molecular weight from 400 to 10,000, and preferably from 600 to 8,000. The resulting polymeric products comprise sequences of perfluoroolefinic units and perfluoropolyether blocks.

Abstract: Process for the protection of stone materials, marble, bricks, and concrete, and of structures made from such materials, against the decay caused by atmospheric agents and pollutants, by applying to the surface of said materials or structures a mixture which is constituted by:(1) polytetrafluoroethylene in the form of a fine powder;(2) a perfluoropolyether not bearing functional groups; and/or(3) a perfluoropolyether or a fluoropolyether having a chain end, or both chain ends, constituted by functional groups which are capable of forming a chemical and/or physical bond with the material to be protected.The invention also relates to a process for preventing, on the normal materials for building industry and lining materials, the decay effects caused by writings made by using spray paits or brush paints, inks, and the like.

Abstract: Vulcanizable compositions of fluoroelastomers based on vinylidene fluoride with one or more monomers containing an ethylene unsaturation and at least one fluorine atom, having improved processability and improved chemical stability, and comprising, as a processing coadjuvant, a mono- or dihydroxypolyfluoroether having a means molecular weight higher than or equal to 400 for the monohydroxypolyfluoroethers and higher than or equal to 2500 for the dihydroxypolyfluoroethers.

Abstract: Co-vulcanizable compositions comprising a fluoroelastomer (A) composed of from 40% to 85% by mol of vinylidene fluoride, from 15% to 35% by mol of perfluoropropene and from 0 to 30% by mol of tetrafluoroethylene; a copolymer (B) containing from 40% to 60% by mol of tetrafluoroethylene and from 40% to 60% by mol of propylene; and (C) a compound belonging to the class of bis-peroxydicarbamates.

Abstract: Fluoroelastomer compositions vulcanizable with peroxides having improved processability and compatibility properties and comprising, as additives, ethylene polymers and ethylene-propylene or ethylene-butene copolymers having, along the polymer chain, ester groups of the type--COOR where R is a C.sub.1 -C.sub.8 alkyl, wherein the ester groups amount to 0.5-10% by weight as referred to the total polymer. Such polymer additives contain the ester group bound to a carbon atom of the chain either directly or through a --CH.sub.2 -- or in the form ##STR1## where R is a C.sub.1 -C.sub.8 alkyl group.

Abstract: Co-vulcanizable compositions comprising (A) 55-85% by weight of a fluoroelastomeric copolymer of vinylidene fluoride with perfluoropropene and possibly tetrafluoroethylene; (B) 45-15% by weight of a copolymer of tetrafluoroethylene and propylene; (C) 0.7-2.5 parts, per 100 parts of the (A)+(B) blend, of a bisphenolic compound; (D) 0.3-1.5 parts, per 100 parts of the (A)+(B) blend, of a quaternary ammonium, phosphonium or aminophosphonium organic compound; (E) 0.4-5 parts, per 100 parts of the (A)+(B) blend, of an organic peroxide; (F) 1-5% by weight, as referred to (A)+(B), of a peroxidic cross-linking coagent.

Abstract: There are prepared compounds of general formula: ##STR1## wherein: R.sub.1 =H, or alkyl or acyl containing from 1 to 10 carbon atoms, R.sub.2, R.sub.3, like or unlike each other, may be H, or an alkyl containing from 1 to 10 carbon atoms and where R.sub.1 and R.sub.2 may form, together, an alkylene group containing from 2 to 10 carbon atoms, and optionally including up to 2 oxygen atoms in the chain, by means of addition reaction induced by radicalic starters of 1,2-dichlorodifluoroethylene to alcohols, ethers or esters of general formula: ##STR2## wherein: R.sub.1, R.sub.2, R.sub.3 are defined as above.

Abstract: Cotelomers of vinylidene fluoride with one or more fluoro olefins, having the general formulaR[(CF.sub.2 CH.sub.2)n (C.sub.3 F.sub.6)m (C.sub.2 F.sub.4)p (C.sub.2 F.sub.3 Cl)q]X (I)wherein:X is either Br or I, R is an alkyl radical eventually containing halogen atoms, n is an integer comprised within the range of from 1 to 30, m is an integer comprised within the range of from 0 to 10, p and q are integers comprised within the range of from 0 to 20, and wherein m+p+q is at least 1, obtained by cotelomerizing monomers in the presence of a telogen RX (wherein R and X have the abovesaid meaning) and of a free-radical polymerization initiator.

Abstract: Vulcanizable compositions of fluoroelastomers based on vinylidene fluoride with one or more monomers containing an ethylenic unsaturation and at least one fluorine atom, which utilize as a cross-linking agent a dihydroxypolyfluoroether having a molecular weight of from 360 to 2000.

Abstract: The surface of stone materials, of tiles, of cement mixes and articles and structures manufactured therefrom are protected against atmospheric and polluting agents by superficially applying a protecting material consisting of a vinylidene fluoride polymer or copolymer comprising 55-100% by moles of vinylidene fluoride, 0-5% by moles of propene hexafluoride and 0-30% by moles of tetrafluoroethylene. Such polymers or copolymers are applied to the surface to be protected in the form of a solution in volatile solvents.

Abstract: Double bonds in saturated fluoroelastomers consisting of copolymers of vinylidene fluoride with hexafluoropropene and/or chlorotrifluoroethylene, and optionally tetrafluoroethylene, are obtained by reacting the polymer in a solution of a water-insoluble solvent in the presence of an aqueous phase, an inorganic base, and a phase-transfer catalyst.

Abstract: A process for preparing vinylidene fluoride homopolymers having low molecular weight and its copolymers by carrying out the polymerization in the presence of a radical initiator at a temperature ranging from 20.degree. to 160.degree. C. in a solvent of general formula R--COO--R.sub.1, wherein R is hydrogen or an alkyl radical having up to 4 carbon atoms and R.sub.1 is an alkyl radical with up to 5 carbon atoms.