Patents by Inventor Andrea De Toffol

Andrea De Toffol 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).

  • Patent number: 6875499
    Abstract: A thermoplastic material composite panel, comprising a transparent thermoplastic base layer, light conducting, having a thickness generally in the range 3-40 mm, and a light diffusing layer, having a thickness generally in the range 10-1500 micron, placed on one face of the base layer, said diffusing layer being characterized in that it contains barium sulphate in amount by weight, expressed as per cent ratio on the total weight of the diffusing layer, in the range 0.01-2%, the barium sulphate having average particle sizes in the range 0.1-50 micron, the composite sizes being-greater than or equal to 10 cm.
    Type: Grant
    Filed: January 19, 2000
    Date of Patent: April 5, 2005
    Assignee: Elf Atochem S.A.
    Inventors: Andrea De Toffol, Alberto Luca Stasi
  • Patent number: 4404338
    Abstract: Process for preparing copolymers of vinyl-aromatic monomers with ethylenically unsaturated nitriles having a very low content of unreacted residual monomers, consisting in adding to the polymerization dispersion, containing a compound capable of giving free radicals, and in the final step of the polymerization process, from 0.2 to 2% by weight of a comonomer which is reactive towards the unreacted monomers.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: September 13, 1983
    Assignee: Montedison S.p.A.
    Inventors: Andrea De Toffol, Nicola Anfossi, Gianfranco Veroli
  • Patent number: 4357270
    Abstract: Rubbery polymer latexes are agglomerated by mixing them with another latex containing:(1) a polymer, different from that present in the latex to be agglomerated and less lipophilic than the latter, selected from (a) homopolymers of alkyl acrylates and methacrylates in which the alkyl has from 1 to 12 carbon atoms, and (b) copolymers of ethylenically unsaturated monomers capable of forming water-insoluble homopolymers, and(2) a non-ionic surfactant consisting of an addition product of ethylene oxide.The agglomerating latex is added in quantities corresponding to 0.1-20 parts by weight of solid polymer and to 0.0001-0.2 parts by weight of surfactant per 100 parts by weight of the rubbery polymer present in the latex to be agglomerated.A particular use of the agglomerated rubbery polymer latexes is in the production of ABS resins.
    Type: Grant
    Filed: November 26, 1980
    Date of Patent: November 2, 1982
    Assignee: Montedison S.p.A.
    Inventors: Roberto Pippa, Andrea De Toffol, Agostino Lepori, Luigi Mara