Patents by Inventor Roberto Biaggi

Roberto Biaggi 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).

  • Production of vinyl chloride polymer
    Patent number: 4324878
    Abstract: A process for producing vinyl chloride polymer which comprises polymerizing vinyl chloride monomer in aqueous suspension, in the presence of a free radical catalyst, a primary suspending agent apt to control the granulometric distribution of the particles of PVC obtained, as well as a secondary suspending agent consisting of partially hydrolyzed polyvinyl acetate having a saponification number between 520 and 600 and a viscosity, measured in a 4% methanol solution at 20.degree. C., between 0.5 and 2 cps.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: April 13, 1982
    Assignee: Sigma Italiana Prodotti Chimici S.p.A.
    Inventors: Roberto Biaggi, Massimo Quintini