Patents Assigned to Ausimont S.p.A.
  • Imide-aromatic peroxyacids as bleaching agents
    Patent number: 5520844
    Abstract: Bleaching agents constituted by at least one imidearomatic (poly)peroxyacid, having the formula (I): ##STR1## wherein A represents a residue of a substituted or unsubstituted benzene or naphthalene ring, R is a hydrogen atom, a lower alkyl group, an OH group, a COOH group, a COOOH group or a COOR' group wherein R' represents a C.sub.1 -C.sub.5 alkyl group, and n is an integer from 1 to 5.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: May 28, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Carlo Venturello, Claudio Cavallotti, Fulvio Burzio
  • (Co)polymerization process in aqueous emulsion of fluorinated olefinic monomers
    Patent number: 5516863
    Abstract: Radical (co)polymerization process of fluorinated olefinic monomers, optionally in association with one or more non-fluorinated olefins, in which the monomers are (co)polymerized in aqueous emulsion, in the presence of a hydrogenated chain transfer agent selected from hydrogen, aliphatic hydrocarbons and fluorohydrocarbons C.sub.1 -C.sub.20 and of a branched chain aliphatic alcohol C.sub.3 -C.sub.12 characterized by a ratio between the number of hydroxyl groups and the number of methyl groups lower than or equal to 0.5.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: May 14, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Julio A. Abusleme, Patrizia Maccone, Pasqua Colaianna
  • Process for preparing thermoplastic hydrogen-containing fluoropolymers
    Patent number: 5510435
    Abstract: Cyclopentanes alkyl-substituted with one or more C.sub.1 -C.sub.6 alkyls are used as chain transfer agents in (co)polymerization reactions carried out, either in suspension or in aqueous emulsion, at low temperatures, comprised between -30.degree. and +30.degree. C., for preparing thermoplastic hydrogen-containing fluoropolymers , such as for instance ethylene/chlorotrifluoroethylene and ethylene/tetrafluoroethylene copolymers, or homopolymers and copolymers of vinylidenefluoride. They are transfer agents having high efficiency, which are liquid and thus can be easily handled and dosed, non-toxic, yielding alkyl end groups of high thermal stability.
    Type: Grant
    Filed: March 16, 1995
    Date of Patent: April 23, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Julio A. Abusleme, Sheldon J. Kirsch
  • Fluorinated polymers containing perfluoropolyoxyalkylene sequences and having thermoplastic elastomeric properties
    Patent number: 5508380
    Abstract: Fluorinated polymers having thermoplastic elastomeric properties comprising in the macromolecule perfluoropolyoxyalkylene sequences of formula:--CF.sub.2 O--(CF.sub.2 CF.sub.2 O).sub.m --(CF.sub.2 O).sub.n --CF.sub.2 --(I)where m/n=0.2+5, are obtained through polycondensation with suitable perfluoropolyoxyalkylene condensation monomers corresponding to formula (I), functionalized with suitable reactive groups and having a functionality at least equal to 1.97, preferably at least equal to 1.99.Such polymers are characterized by an average molecular weight at least 50%, preferably at least 100%, higher than that of the corresponding polymers obtained starting from perfluoropolyoxyalkylenes corresponding to formula (I) having a functionality not higher than 1.96.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: April 16, 1996
    Assignee: Ausimont, S.p.A.
    Inventors: Stefano Turri, Giuseppe Gianotti, Marinella Levi, Claudio Tonelli
  • Polymerization process in aqueous emulsion of fuluorinated olefinic monomers
    Patent number: 5498680
    Abstract: In a process of (co)polymerization in aqueous emulsion of fluorinated olefinic monomers it is added to the reaction medium a microemulsion of fluoropolyoxyalkylenes having hydrogenated end groups and/or hydrogenated repetitive units. A remarkable reduction in the reaction induction period is so obtained, with formation of a product with improved mechanical properties and higher thermal and chemical resistance.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: March 12, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Julio A. Abusleme, Patrizia Maccone
  • Perfluorodioxoles, the preparation process thereof, and homopolymers and copolymers obtained therefrom
    Patent number: 5498682
    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: July 1, 1994
    Date of Patent: March 12, 1996
    Assignee: Ausimont, S.p.A.
    Inventors: Walter Navarrini, Vito Tortelli, Pasqua Colaianna, Julio A. Abusleme
  • Process for decreasing the build up of inorganic incrustations on textiles and detergent composition used in such process
    Patent number: 5496494
    Abstract: A process for decreasing the build-up of inorganic incrustations on textiles deriving from water hardness and due to repeated washing cycles with detergent compositions comprises the addition to the washing bath of a non-reducing carbohydrate and/or non-reducing carbohydrate derivative as co-builder.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: March 5, 1996
    Assignees: Ausimont S.p.A., Cerestar Holding B.V.
    Inventors: Fulvio Burzio, Roland Beck
  • Perfluorodioxoles, the preparation process thereof, and homopolymers and copolymers obtained therefrom
    Patent number: 5495028
    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: June 6, 1995
    Date of Patent: February 27, 1996
    Assignee: Ausimont, S.p.A.
    Inventors: Walter Navarrini, Vito Tortelli, Pasqua Colaianna, Julio A. Abusleme
  • Process for preparing perfluoropolyethers
    Patent number: 5488181
    Abstract: Process for preparing peroxidic perfluoropolyethers by oxidation of tetrafluoroethylene with oxygen, in liquid phase comprising a solvent and in the presence of a chemical initiator, at a pressure between 2 and 15 absolute atm and operating with a molar ratio of the tetrafluoroethylene to the chemical initiator higher than 35. The process allows to increase the molecular weight of the perfluoropolyethers at the same content of peroxidic oxygen.
    Type: Grant
    Filed: November 16, 1994
    Date of Patent: January 30, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Giuseppe Marchionni, Pier A. Guarda, Maurizio Paganin
  • Process for separating phthalimido-peroxycaproic acid from solutions in organic solvents
    Patent number: 5487818
    Abstract: A process for separating phthalimido-peroxycaproic acid (PAP) from solutions in organic solvents, wherein the organic solvents have a solubility in water equal to or lower to 10% by weight, is provided. The process employs the following steps:(a) dispersing the solution in an aqueous medium to form a suspension;(b) bubbling an inert gas into the resulting suspension; and(c) recovering PAP from the suspension.
    Type: Grant
    Filed: August 4, 1994
    Date of Patent: January 30, 1996
    Assignee: Ausimont S.p.A.
    Inventors: Claudio Cavallotti, Claudio Troglia, Roberto Garaffa
  • Multilayer structures of fluorinated and non-fluorinated thermoplastic polymers
    Patent number: 5480721
    Abstract: Multilayer structures comprising at least a fluorinated thermoplastic and a non-fluorinated thermoplastic wherein the adhesive intermediate layer comprises a fluorinated thermoplastic, a non-fluorinated thermoplastic and an ionomer which comprises copolymers having reactive groups salified or not; the amount of reactive groups in the ionomer copolymer being preferably higher than 3% by weight, in general between 8-35%.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: January 2, 1996
    Assignee: Ausimont, S.p.A.
    Inventors: Massimo Pozzoli, Giandomenico Vita, Larry L. Chapoy
  • Fluorine-containing compounds having polyacetalic structure, and process for preparing them
    Patent number: 5476918
    Abstract: 1) New fluorine-containing compounds having polyacetalic structure, of general formula:(I)[Rf.sub.m --CH.sub.2 O(CH.sub.2 O).sub.c --CH.sub.2 ].sub.nwhere: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:(II) HORfOHwith 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.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: December 19, 1995
    Assignee: Ausimont, S.p.A.
    Inventors: Ferdinando Danusso, Ezio Strepparola, Marinella Levi, Claudio Tonelli, Stefano Turri
  • Coatings based on polyesters from perfluoropolyethers
    Patent number: 5476721
    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: April 28, 1994
    Date of Patent: December 19, 1995
    Assignee: Ausimont, S.p.A.
    Inventors: Giovanni Simeone, Fabrizio Mutta, Angelo Locaspi, Claudio Tonelli
  • Thermoplastic polyesters containing perfluoropolyoxyalkylene sequence
    Patent number: 5476910
    Abstract: Fluorinated thermoplastic elastomers having a block structure:--[--R.sub.f --H.sub.1 --H.sub.2 --H.sub.1 --]--where --R.sub.f -- is a perfluoropolyoxyalkylene sequence of formula:--CF.sub.2 O--(CF.sub.2 CF.sub.2 O).sub.m --(CF.sub.2 O).sub.n --CF.sub.2 --with m/n=0.2.div.5, H.sub.1 and H.sub.2, equal or different from each other, are bivalent radicals having arylene, alkylarylene, alkylene or cycloalkylene structure, optionally containing fluorine and/or other heteroatoms selected among oxygen, sulphur, nitrogen. Such products are obtainable by utilizing a perfluoropolyoxyalkylene diol having a functionality at least equal to 1.97, preferably at least equal to 1.99, and are characterized by a tensile strength at 23.degree. C. at least 50% higher than that of the corresponding polyesters obtained starting from perfluoropolyoxyalkylene diols having a functionality not higher than 1.96.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: December 19, 1995
    Assignee: Ausimont, S.p.A.
    Inventors: Stefano Turri, Giuseppe Gianotti, Marinella Levi, Claudio Tonelli
  • Process for purifying 1,1,1-trifluoro-2-fluoroethane
    Patent number: 5475168
    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 the presence of chrome oxide (Cr.sub.2 O.sub.3) in substantially crystalline form.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: December 12, 1995
    Assignee: Ausimont S.p.A.
    Inventors: Antonio Masiero, Paolo Cuzzato, Letanzio Bragante
  • Process for preparing vinylidenefluoride polymers
    Patent number: 5473030
    Abstract: Object of the present invention is a process for preparing vinylidenefluoride (VDF) polymers which comprises polymerizing VDF, optionally in association with other fluorinated oiefins in an aqueous medium in the presence of a radical initiator and of 1,1,1-trifluoro-2,2-dichloroethane (HCFC-123) as chain transfer agent.A final product with very good colour characteristics (appearance), substantially devoid of discoloration effects at high temperatures, is so obtained.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: December 5, 1995
    Assignee: Ausimont S.p.A.
    Inventors: Vincenzo Arcella, Bradley Kent, Patrizia Maccone, Giulio Brinati
  • Method for inhibiting the degradation of hydrochlorofluorocarbons utilized as foaming agents in the preparation of foamed polyurethanes and polyisocyanurates
    Patent number: 5464882
    Abstract: The invention relates to a method for inhibiting the degradation by dehydrohalogenation of hydrochlorofluorocarbons, such as for example the mixture of 123 and 123a, used as foaming agents during the formation reaction of foamed polyurethanes or polyisocyanurates starting from polyols and polyisocyanates. Prior to the reaction starting, a little amount of a stabilizing substance selected from the group consisting of nitromethane, nitroethane and 1-nitropropane is added to the reaction medium.
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: November 7, 1995
    Assignee: Ausimont S.p.A.
    Inventors: Giampiero Basile, Ezio Musso, Claudio Tonelli, Sauro Girolomoni
  • Thermoprocessable copolymers of tetrafluoroethylene
    Patent number: 5463006
    Abstract: The invention relates to new thermoprocessable tetrafluoroethylene copolymers particularly suitable for coating electric cables by melt extrusion. These copolymers consist of:(a) from 0.5 to 13% by weight of perfluoromethylvinylether;(b) from 0.05 to 3% by weight of one or more monomers selected in particular classes of linear perfluoroalkylvinylethers containing one or more ether oxygen atoms, of perfluorovinylethers containing a cycle having 6 atoms and having one or more ether oxygen atoms, and of alphafluoroalkylethylenes;(c) tetrafluoroethylene, in such an amount that the sum of the percentages of the various monomers is equal to 100% by weight.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: October 31, 1995
    Assignee: Ausimont, S.p.A.
    Inventors: Julio A. Abusleme, Pasqua Colaianna
  • Multifilament yarns of thermoplastic polymers based on tetrafluoroethylene, and drawn multifilament yarns obtained therefrom
    Patent number: 5460882
    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 drawn multifilament yarn with even further improved tensile strength and modulus.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: October 24, 1995
    Assignee: Ausimont S.p.A.
    Inventors: Giandomenico Vita, Giuseppe Ajroldi, Mario Miani
  • Rotating stirring device
    Patent number: 5460447
    Abstract: A rotating stirring device, particularly for mixing heterogeneous systems in mechanical stirred reactors, is fit to be joined to a drive shaft coaxial with respect to the device rotation axis. The device includes a plurality of extended and substantially C-shaped stirring elements symmetrically arranged with respect to the rotation axis and joined to each other at respective ends corresponding with the rotation axis. Such a device permits a very efficient material exchange among different phases to be obtained and to remain substantially constant with an increase in the volume of the mass being stirred. The device is also characterized by a high mixing homogeneity and particularly low shear stress values.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: October 24, 1995
    Assignee: Ausimont S.p.A.
    Inventors: Hua Wu, Vincenzo Arcella