Patents by Inventor Piergiorgio Bonardelli

Piergiorgio Bonardelli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the preparation of curable fluoroelastomers and products so obtained
    Patent number: 4745165
    Abstract: Process for the preparation of curable fluoroelastomers comprising reacting form 35 to 80 mol % of vinylidene fluoride, from 15 to 35 mol % of hexafluoropropene, from 0 to 30 mol % of another comonomer selected from fluoroolefins and/or perfluorovinyl ethers and from 0.01 to 1 mol % of a brominated fluorovinyl ether having general formula:CF.sub.2 BR--(R.sub.f).sub.n --O--CF.dbd.CF.sub.2wherein R.sub.f is a fluorinated alkylene radical containing from 1 to 9 carbon atoms and n can be either 0 or 1, in the presence of a known polymerization initiator for fluoroelastomers, and of small amounts of a chain-transfer agent having general formula:R--(CF.sub.2 Br).sub.mwherein m is either 1 or 2; when m is 1, R can be either bromine or a perfluoroalkyl radical of 2 to 4 carbon atoms containing a bromine atom bonded to a secondary carbon atom; and when m is 2, R is an alkylene radical of up to 4 carbon atoms containing a bromineatom bonded to a secondary carbon atom.
    Type: Grant
    Filed: July 7, 1986
    Date of Patent: May 17, 1988
    Assignee: Ausimont S.p.A.
    Inventors: Vincenzo Arcella, Giulio Brinati, Piergiorgio Bonardelli, Giulio Tommasi
  • Process for preparing unsaturated fluoroelastomers
    Patent number: 4742126
    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.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: May 3, 1988
    Assignee: Ausimont S.p.A.
    Inventors: Giovanni Moggi, Piergiorgio Bonardelli, Graziella Chiodini, Stefano Conti
  • Process for preparing vinylidene fluoride homopolymers and its copolymers
    Patent number: 4739024
    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.
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: April 19, 1988
    Assignee: Montefluos S.p.A.
    Inventors: Giovanni Moggi, Alessandra Caratto, Piergiorgio Bonardelli, Claudio Monti
  • Fluoroelastomeric compositions based on vinylidene fluoride, containing small amounts of chlorotrifluoroethylene, having a high adhesion to metals in the vulcanized state
    Patent number: 4612351
    Abstract: Fluoroelastomeric compositions based on vinylidene fluoride, having a high adhesion to metals in the vulcanized state, and characterized in that they contain small amounts of chlorotrifluoroethylene which is present as a comonomer of an elastomeric copolymer of vinylidene fluoride.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: September 16, 1986
    Assignee: Montedison S.p.A.
    Inventors: Gerardo Caporiccio, Enrico Monza, Piergiorgio Bonardelli, Giovanni Moggi, Gianna Cirillo