Patents Assigned to Ausimont S.p.A.
  • Process for preparing 1,1,1,2-tetrafluoroethane
    Patent number: 5608125
    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.
    Type: Grant
    Filed: July 25, 1995
    Date of Patent: March 4, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Paolo Cuzzato, Antonio Masiero
  • Process for preparing tetrafluoroethylene copolymers with other perfluorinated monomers
    Patent number: 5608020
    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.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 4, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Pasqua Colaianna, Julio A. Abusleme, Natalino D. Fanti
  • Fluorinated thermoplastic elastomers having superior mechanical and elastic properties, and preparation process thereof
    Patent number: 5605971
    Abstract: Fluorinated thermoplastic elastomers comprising monomeric units deriving from at least an iodinated olefin of formula:CX.sub.2 .dbd.CX--R.sub.f --CHR--I (I)wherein:X is --H, --F, or --CH.sub.3 ; R is --H or --CH.sub.3 ; R.sub.f is a (per) fluoroalkylene radical, linear or branched, optionally containing one or more ether oxygen atoms, or a (per) fluoropolyoxyalkylene radical.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: February 25, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Vincenzo Arcella, Giulio Brinati, Margherita Albano, Vito Tortelli
  • Process for imparting oil- and water-repellency to textile fibres, skin, leather and the like
    Patent number: 5602225
    Abstract: A process is described for imparting oil- and water-repellency to textile fibers, skin, leather and the like, wherein a composition comprising a functionalized (per)fluoropolyoxyalkylene with silane groups and a phosphoric monoester derived from a (per)fluoropolyoxyalkylene is applied on said materials. As dispersing agent, an hydrophilic organic solvent (for instance an alcohol), optionally in admixture with water can be used. Limpid, stable and easily dilutable formulations are thus obtained, which are capable of imparting very good properties both of oil- and water-repellency. Such properties keep for a long time also after washing both in water by means of detergents and by dry cleaning with organic solvents.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: February 11, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Laura Montagna, Mauro Scapin, Padmanabhan Srinivasan
  • Phosphazene derivatives and use of same as stabilizers for oils and greases based on perfluoropolyethers
    Patent number: 5602270
    Abstract: New phosphazene derivatives, fully substituted by aromatic groups and perfluoropolyethereal chains, are utilized as stabilizers for oils and greases based on perfluoropoyethers. Such derivatives inhibit the degradation process affecting the perfluoropolyethereal chains when these are subjected to high temperatures in an oxidizing atmosphere and in the presence of metals, such as for example aluminium, titanium, vanadium and their alloys, or steels.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: February 11, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Paolo Odello, Walter Navarrini, Richard D. Chambers, Costante Corti
  • Process for isomerizing 1,1,2-trifluoro-1,2-dichloroethane to 1,1,1-trifluoro-2,2-dichloroethane
    Patent number: 5600037
    Abstract: 1,1,2-trifluoro-1,2-dichloroethane (Al23a) is isomerized to 1,1,1-tri-fluoro-2,2-dichloroethane (Al23) by contacting it with AlF.sub.3 at temperatures ranging from 180.degree. to 400.degree. C. Advantageously, it is operated with mixtures of Al23a with Al23 and/or other chlorofluorocarbons coming from the preparation of Al23 by hydrofluorination of perchloroethylene.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: February 4, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Paolo Cuzzato, Letanzio Bragante, Antonio Masiero
  • Ethylene copolymers with tetrafluoroethylene and/or chlorotrifluorethylene having improved mechanical properties at high temperatures
    Patent number: 5597880
    Abstract: Copolymers comprising:(A) from 30 to 70% by moles of ethylene;(B) from 30 to 70% by moles of a fluorinated monomer selected from tetrafluoroethylene, chlorotrifluoroethylene, or their mixtures;(C) from 0.1 to 10% by moles with respect to the total amount of monomers (A) and (B), of a fluorodioxol having the formula: ##STR1## wherein R.sub.F is a perfluoroalkyl having from 1 to 5 carbon atoms; X.sub.1 and X.sub.2, equal to or different from each other, are --F or --CF.sub.3 ; Z is selected from --F, --H, --Cl.
    Type: Grant
    Filed: January 4, 1996
    Date of Patent: January 28, 1997
    Assignee: Ausimont S.p.A.
    Inventors: Julio A. Abusleme, Pasqua Colaianna
  • Fluorinated polymers and copolymers containing cyclic structures
    Patent number: 5589557
    Abstract: Polymers and copolymers of one or more fluorinated dienes of structure CFX.sup.1 .dbd.CX.sup.2 --O--CX.sup.3 X.sup.4 --O--CX.sup.2 .dbd.CX.sup.1 F, wherein X.sup.1 and X.sup.2 are F, Cl or H, and X.sup.3 and X.sup.4 are F or CF.sub.3, wherein said dienes essentially form cyclic repetitive units, the comonomers used for preparing copolymers being ethylene unsaturated fluorinated compounds.Processes for preparing the fluorinated dienes having said structure which comprise the reaction in solution between one halogenated olefin and one hypofluorite CX.sup.3 X.sup.4 (OF).sub.2, wherein X.sup.3 and X.sup.4 are F or CF.sub.3, and the dehalogenation or dehydrohalogenation of the linear adduct between one hypofluorite molecule and two olefin molecules. The polymers and copolymers of the invention are particularly suitable for preparing coatings for applications at high temperatures.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: December 31, 1996
    Assignee: Ausimont, S.p.A.
    Inventors: Walter Navarrini, Vito Tortelli, Alessandro Zedda
  • Coatings based on polyesters from perfluoropolyethers
    Patent number: 5589552
    Abstract: Coatings obtainable from crosslinkable polyesters resins based on perfluoropolyethers obtainable from hydroxy-terminated PFPE, with acid anhydride and/or a diacid, a polyol with functionality higher than 2 and optionally in mixtures of diols having a functionality of 2, the resins being also even 70% weight/weight soluble in xylene.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: December 31, 1996
    Assignee: Ausimont, S.p.A.
    Inventors: Giovanni Simeone, Fabrizio Mutta, Angelo Locaspi, Claudio Tonelli
  • Process for delignifying raw cellulosic material impregnated with monopersulphuric acid
    Patent number: 5587049
    Abstract: A process for delignifying raw cellulose which comprises a preliminary treatment for impregnating raw cellulose with a monopersulphuric acid solution, a successive filtration without washing with recycle of the filtered liquid to the first step, and a treatment, at low temperature and in alkaline solution at a pH higher than 9, of the previously impregnated raw cellulose in order to permit the reaction of the monopersulphuric acid with the lignin contained in the raw cellulose.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: December 24, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Fausto Marzolini, Giulio Calmanti, Gianpiero Sacchi
  • Fluoroelastomers comprising monomeric units deriving from a bis-olefin
    Patent number: 5585449
    Abstract: New fluoroelastomers are described, 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.Such products are endowed with improved processability, especially during calendering of the vulcanization mixture, along with superior mechanical and workability properties during extrusion and injection molding, with a very good mold release.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: December 17, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Vincenzo Arcella, Giulio Brinati, Margherita Albano, Vito Tortelli
  • Polyvinylidenefluoride having high mechanical properties and high thermochemical stability and the preparation process thereof
    Patent number: 5583190
    Abstract: A polyvinylidenefluoride (PVDF) having high mechanical properties both at room temperature and at high temperatures, having very good processability and high thermochemical resistance to dehydrofluorination, is prepared by means of a polymerization process of vinylidenefluoride in aqueous emulsion at a temperature comprised between 95.degree. and 120.degree. C., in the presence of a chain transfer agent. In this way it is possible to obtain, using non-hazardous peroxidic initiators (for instance diterbutylperoxide), a PVDF particularly suitable for applications where high mechanical and thermochemical resistance properties are required, such as for instance the manufacture of articles for chemical industry (pipes, valves, fittings, tanks, heat exchangers, membranes, flanges, etc.).
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: December 10, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Giulio Brinati, Vincenzo Arcella, Margherita Albano
  • Perfluorodioxoles, the preparation process thereof, and homopolymers and copolymers obtained therefrom
    Patent number: 5571932
    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.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: November 5, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Walter Navarrini, Vito Tortelli, Pasqua Colaianna, Julio A. Abusleme
  • Process for reducing the back migration in mechanical vacuum pumps operating with perfluoropolyether oils
    Patent number: 5571780
    Abstract: The invention relates to a process for reducing the back migration of the most volatile fractions of perfluoropolyethers during the operation of mechanical vaccum-generating pumps which utilize perfluoropolyethers: use is made of perfluoropolyethers containing not more than 0.1% by weight of fractions having a molecular weight lower than or equal to 1,500 and not more than 1.3% by weight of fractions having a molecular weight lower than or equal to 1,800.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: November 5, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Rossella Silvani, Valerio Carsetti, Casimiro Pace, Padmanabhan Srinivasan
  • (co)polymerization process in suspension for preparing hydrogen containing thermoplastic fluoropolymers
    Patent number: 5569728
    Abstract: The invention relates to a (co)polymerization process in suspension for preparing hydrogen containing thermoplastic fluoropolymers, such as for instance ethylene/chlorotrifluoro-ethylene or ethylene/tetrafluoroethylene copolymers, or vinylidenefluoride homopolymers or copolymers, wherein bis-dichlorofluoroacetylperoxide (CFCl.sub.2 --CO--O).sub.2 (DCFAP) is used as polymerization initiator. From such process products endowed with high thermal stability, remarkably higher than that obtainable using bis-trichloroacetylperoxide (TCAP), are obtained.
    Type: Grant
    Filed: March 16, 1995
    Date of Patent: October 29, 1996
    Assignee: Ausimont, S.p.A.
    Inventors: Julio A. Abusleme, Piero Gavezotti
  • Process for purifying 1,1,1-trifluoro-2-fluoroethane
    Patent number: 5563305
    Abstract: 1,1,1-trifluoro-2-fluoroethane (CFC 134a) is purified from 1,1-difluoro-2-chloroethylene (CFC 1122) by reacting a mixture comprising said compounds with hydrofluoric acid, at temperatures from 200.degree. C. to 450.degree. C., in one presence of chrome oxide (Cr.sub.2 O.sub.3) in substantially crystalline form.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: October 8, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Antonio Masiero, Paolo Cuzzato, Letanzio Bragante
  • Process for separating HF from its mixtures with hydrochlorofluorocarbons 123 and/or 124
    Patent number: 5560899
    Abstract: The invention relates to a process for separating HF contained in liquid mixtures comprising HCFC 123 and/or 124. The mixtures, enriched in C.sub.2 Cl.sub.4 up to a content of such compound of 20-75% by weight, is subjected to a treatment for separating liquid phases, thereby obtaining an acid phase very rich in Hf and an organic phase impoverished in HF, which is subjected to a flash, so obtaining a liquid phase containing 123, 124 and C.sub.2 Cl.sub.4, having a very low HF content, and a gas phase enriched in HF. As an alternative to flash, a separation in a distillation column can be carried out.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: October 1, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Giampaolo Solinas, Giampiero Basile
  • Multifilament yarns of thermoplastic polymers based on tetrafluoroethylene, and fibers obtained therefrom
    Patent number: 5552219
    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.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: September 3, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Giandomenico Vita, Giuseppe Ajroldi, Mario Miani
  • Compositions consisting of hydrogenated fluorocarbons
    Patent number: 5543071
    Abstract: Nearly azeotropic compositions consisting of hydrogenated fluorocarbons, suitable as freezing mixture in conditioning plants, essentially consisting of:(A) from 38 to 53% by weight of R22;(B) from 34 to 56% by weight of R124 and/or R124A;(C) from 2 to 13.5% by weight of R600 and/or R600A.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: August 6, 1996
    Assignee: Ausimont S.P.A.
    Inventors: Giampiero Basile, Ezio Musso
  • Imido-derivative peroxycarboxylic acids
    Patent number: 5536434
    Abstract: This invention relates to imido-derivative peroxycarboxylic acids having the formula I: ##STR1## wherein R and R.sub.1, which may be the same or different, represent hydrogen atoms, alkyl groups, or, taken together with the carbon atoms to which they are linked, give rise to a cyclic aliphatic ring, all of them being optionally substituted; the . . . symbol indicates a simple or an olefinic bond; R.sub.2 represents a hydrogen atom, an alkyl group, or an OH group, and n is an integer different from 0; the process for their preparation and their use as bleaching agents.
    Type: Grant
    Filed: October 20, 1989
    Date of Patent: July 16, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Carlo Venturello, Claudio Cavallotti, Elena Bencini, Maria A. Sasso