Abstract: Microemulsions substantially consisting of:an aqueous solution,a perfluoropolyether having perfluoroalkyl end groups,a hydrocarbon compound,a fluorinated surfactantand optionally also of a hydrogenated or fluorinated alcohol, said microemulsions being in the form of a limpid or opalescent liquid, macroscopically consisting of a single phase, stable in a certain temperature range. The dispersing phase (or continuous phase) in the microemulsion may consist of one of the three above said liquid components, wherefore the microemulsion may be of the oil-in-water or water-in-oil type.

Abstract: Phosphoric monoesters of formula: ##STR1## wherein: L is a divalent organic group; m=1; Y is --F or --CF.sub.3 ; Z.sup.+ is selected from: H.sup.+, M.sup.+ wherein M is an alkali metal, N(R).sub.4.sup.+ wherein the R groups, equal or different from each other, are H or C.sub.1 -C.sub.6 alkyls; R.sub.f is a poly-perfluoroalkyleneoxide chain; are used for surface treatment of cellulosic (for instance wood or paper), metallic (either ferrous or non-ferrous), vitreous (for instance glass or vitrified ceramics) materials, or of cements, marbles, granites, and the like.

Abstract: Process for preparing hydrogen-containing fluoropolymers, wherein the corresponding olefinic monomers are (co) polymerized in an organic suspending medium in the presence of a radical photoinitiator and of ultraviolet-visible radiation at a temperature of from -60.degree. C. to +30.degree. C. Hydrogen-containing fluoropolymers are thus obtained having high second melting temperature and high maximum operating temperature, using as initiators non-hazardous products, which can be easily handled and kept also at room temperature.

Abstract: A process of bleaching using at least one imide-aromatic (poly)peroxyacid, having a formula: ##STR1## wherein A represents the residue of a benzene or napthalene ring optionally substituted by a COOH or COOOH group, the symbol or symbols R, which may be the same or different from each other, represent a hydrogen atom, a C.sub.1 -C.sub.5 alkyl group, an OH group, a COOH group, a COOOH group, a COOR' group, wherein R' represents a C.sub.1 -C.sub.5 alkyl group, or a substituted C.sub.1 -C.sub.5 alkyl group wherein the substituent is nitro, an OH group or a C.sub.1 -C.sub.5 alkoxy group, and n is an integer from 1 to 5.

Abstract: Thermoplastic polyester compositions comprising polyester resin modified by introducing perfluoropolyether blocks in the polymeric chain characterized by high crystallization rate of the melted mass and therefore by an improved processability. In particular the use of such compositions in a process for preparing molded thermoplastic articles allows working at lower temperatures of the mold and with shorter molding times. Process for preparing modified resins.

Abstract: New fluoroelastomers are described, having iodine atoms in terminal position and monomeric units in the chain deriving from an iodinated olefin of formula:CHR.dbd.CH--Z--CH.sub.2 CHR--I (I)wherein: R is --H or --CH.sub.3 ; Z is a (per)fluoroalkylene radical C.sub.1 -C.sub.18, linear or branched, optionally containing one or more ether oxygen atoms, or a (per) fluoropolyoxyalkylene radical.These products, upon peroxide curing, require extremely short post-curing treatments (around 30-60 minutes at 180.degree.-230.degree. C.) and are characterized by compression set values lower than 25% (measured on O-rings at 200.degree. C. for 70 hours according to ASTM Standard D395 Method B).

Abstract: Process for preparing dispersions containing mixed oxides having particle size lower than or equal to 50 nm and having narrow size distribution, comprising the following steps:P1) preparing a microemulsion of water in oil, the oil being a perfluoropolyether, said microemulsion being obtained using a perfluoropolyether surfactant, the aqueous phase consisting of a solution of an inorganic salt of a M1 metal;P2) preparing a M2 metal salt of an anionic perfluoropolyether surfactant, such salt being soluble in the perfluoropolyether oil used in P1, the amount by moles of surfactant being such as to fully bind to the cation and so as not to be in excess;P3) adding P2 to P1 for obtaining the reaction system containing the two metals M1 and M2; M1 in aqueous phase and M2 in perfluoropolyether oil phase;P4) adding alkali solution to P3 with contemporaneous or subsequent heating, if P3 has not yet been heated, at the temperature necessary to form the desired oxide; then cooling and separating the aqueous supernatant;M

Abstract: Peroxide-curable fluoroelastomeric compositions, consisting of a fluoroelastomer containing bromine, an organic peroxide and a metal-organic hydride having the formula: ##STR1## 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. The hydride addition allows to increase the curing rate, obtaining at the same time a high crosslinking degree.

Abstract: Ternary mixtures, particularly suitable for removing oily substances having both an hyrogenated and fluorinated or mixed basis, essentially consisting of: (a) water; (b) terbutanol; (c) a fluoropolyoxyalkylene having hydrogenated end groups and/or hydrogenated repetitive units. Such mixtures have high flash point, are non toxic and with null depleting potential of the ozone and show a ternary diagram characterized by a wide monophasic zone, wherein the three components form limpid and stable solutions.

Abstract: A process for preparing perhaloethers from perhaloolefins by reacting at least one fluorooxy compound R.sub.x --OF, wherein R.sub.x is a perhaloalkyl radical, with a perfluoroolefin in a liquid phase, optionally containing an organic solvent inert to the perfluoroolefin, while maintaining the temperature of the liquid phase in the range of -30.degree. to -120.degree. C. The process includes continuously feeding to the liquid phase a stream of an inert gas and a gaseous stream of the fluorooxy compound.

Abstract: Curable flurooelastomeric compositions used for O-rings comprising:A) parts (phr) of a curable fluoroelastomeric copolymer having a content in F<67% by weight and comprising from 40 to 68% by weight of VDF units, from 20 to 50% by weight of HFP units, the sum being 100, and optionally one or more comonomers having ethylene unsaturation, said copolymer having a number of ionic terminals of at least 0.5 for chain;B) from 1 to 5 phr of an adduct between an accelerator and a curing agent in molar ratio from 1:3 to 1:5, the accelerator being an onio-organic compound having a positive charge, the curing agent being a di- or polyhydroxy or di- or polythiol compound; the adduct being obtained by melting of the reaction product between accelerator and curing agent in the indicated molar ratios, or by melting of the adduct mixture 1:1 added with the curing agent in the indicated amounts.

Abstract: Curable fluoroelastomeric compositions employable for preparing fuel hoses or O-rings for injectors comprising:A) 100 phr (parts) copolymers or terpolymers based on VDF with a content in fluorine of at least 67% by weight, the VDF being comprised from 30 to 50% by weight, from 20 to 60% by weight of HFP optionally other monomeric units deriving from a monomer having ethylene unsaturation; the sum of the comonomers being 100;B) 1 to 5 phr of an adduct between an accelerator and a curing agent in molar ratio from 1:2 to 1:5, the accelerator being an onio-organic compound having a positive charge, the curing agent being a di- or polyhydroxy or di- or polythiol compound; the adduct being obtained by melting of the reaction product between accelerator and curing agent in the indicated molar ratios, or by melting of the adduct mixture 1:1 added with the curing agent in the indicated amounts.

Abstract: The invention relates to new thermoprocessable copolymers of tetrafluoroethylene constituted by perfluoromethylvinylether (0.5-13% by weight), a fluorinated dioxole (0.05-3%) and tetrafluoroethylene (difference to 100%), particularly useful for coating electric cables by melt extrusion. It relates also to new perfluorodioxoles of formula ##STR1## wherein R.sub.F is a C.sub.1 -C.sub.5 perfluoroalkyl radical; X.sub.1 and X.sub.2 are, independently from each other, F or CF.sub.3 ; and their homopolymers and copolymers, in particular thermoprocessable copolymers as defined above.

Abstract: Fluoroelastomers comprising, by mole:(a) from 33 to 75% of tetrafluoroethylene (TFE);(b) from 15 to 45% of a perfluorovinylether (PVE);(c) from 10 to 22% of vinylidene fluoride (VDF).They are endowed with high resistance to polar solvents and to bases, excellent compression set also at high temperatures, low Tg and good processability.They result particularly suitable for the manufacture of sealing elements (O-rings) for plants intended to the production of methylterbutylether (MTBE).

Abstract: 1) Disclosed herein are new fluorine-containing compounds having polyacetalic structure, of general formula:[Rf.sub.m --CH.sub.2 O(CH.sub.2 O).sub.c --CH.sub.2 --.brket close-st..sub.n (I)where:Rf=a perfluorooxyalkylene chain having Mn from 500 to 5,000;m=4-25;c=1-10;n=2-100.2) A process for preparing them which comprises carrying out the polycondensation of diols having formula:HORfOH (II)with formaldehyde, in mass or in the presence of solvents, in an acid medium. The compounds of formula (I) can be oligomeric compounds (polymerization degree x.sub.n from 2 to about 20) or polymeric compounds (x.sub.n from about 20 to about 100). They exhibit a high stability to heat and to chemical agents, and Tg values slightly different from the ones of the diols utilized for preparing them.

Abstract: New fluoroelastomers are described, having iodine atoms in terminal position and monomeric units in the chain deriving from an iodinated olefin of formula:CHR.dbd.CH--Z--CH.sub.2 CHR--I (I)wherein: R is --H or --CH.sub.3 ; Z is a (per)fluoroalkylene radical C.sub.1 -C.sub.18, linear or branched, optionally containing one or more ether oxygen atoms, or a (per)fluoropolyoxyalkylene radical.These products, upon peroxide curing, require extremely short post-curing treatments (around 30-60 minutes at 180.degree.-230.degree. C.) and are characterized by compression set values lower than 25% (measured on O-rings at 200.degree. C. for 70 hours according to ASTM Standard D395 Method B).

Abstract: Coatings based on perfluoropolyethers terminated with acrylic groups and containing ethoxylic groups as a connecting bridge between the fluorinated part and the (meth)acrylic group.

Abstract: The invention relates to a process for obtaining copolymers of tetrafluoroethylene with one or more perfluorinated monomers having ethylenic unsaturation, said copolymers having only carboxylic or carboxylate groups as unstable end groups, by polymerization in aqueous emulsion in the presence of a dispersing agent. The process is characterized in that CHF.sub.2 --CH.sub.3 is used as chain transfer agent, and an inorganic peroxidic compound is used as initiator. The carboxylic or carboxylate groups are successively transformed into stable groups of the --CF.sub.2 H type by known stabilizing treatments.

Abstract: A multifilament yarn of a thermoplastic polymer based on tetrafluoroethylene, having high mechanical strength and dimensional stability at high temperatures (200.degree.-250.degree. C.), is prepared by melt extrusion through a die characterized by a hole density comprised between 10 and 150 holes/cm.sup.2 and provided with a cooling system of the emerging yarn of high efficiency and uniformity. The multifilament yarn can be subsequently drawn to obtain a fiber with even further improved tensile strength and modulus.

Abstract: Fluorinated thermoplastic elastomers comprising monomeric units deriving from 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 or different from each other, are H or alkyls C.sub.1 -C.sub.5 ; Z is an alkylene or cycloalkylene radical C.sub.1 -C.sub.18, linear or branched, optionally containing oxygen atoms, preferably at least partially fluorinated, or a (per)fluoropolyoxyalkylene radical.