Patents by Inventor Marcel Puyn

Marcel Puyn 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 preparing polycarbonate
    Patent number: 6555646
    Abstract: A process for quenching a catalyst used in the manufacture of polycarbonate by melt polycondensation of a dihydroxy compound and a diester. The process includes adding a quencher composition to an intermediate polycarbonate to deactivate residual catalyst. The quencher composition includes a compound having at least one sulfonic acid group and at least one amino group.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: April 29, 2003
    Assignee: General Electric Company
    Inventors: Andre Volkers, Marcel Puyn, Ralph Stevens
  • PROCESS FOR PREPARING POLYCARBONATE
    Publication number: 20030055202
    Abstract: A process for quenching a catalyst used in the manufacture of polycarbonate by melt polycondensation of a dihydroxy compound and a diester. The process includes adding a quencher composition to an intermediate polycarbonate to deactivate residual catalyst. The quencher composition includes a compound having at least one sulfonic acid group and at least one amino group.
    Type: Application
    Filed: August 30, 2001
    Publication date: March 20, 2003
    Inventors: Andre Volkers, Marcel Puyn, Ralph Stevens
  • Process for preparing polycarbonate
    Patent number: 6504000
    Abstract: A method for preparing polycarbonates by melt polycondensation of a dihydroxy compound and a diarylcarbonate compound in the presence of an alkaline catalyst is described. A branching quencher compound is added to an intermediate polycarbonate produced by the melt polycondensation reaction in an amount effective to inhibit or prevent the formation of branching species during a subsequent finishing process. Adding the branching quencher compound to the product of the melt polycondensation reaction produces finished polycarbonates with reduced branching species, high ductility and impact strength.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: January 7, 2003
    Assignee: General Electric Company
    Inventors: Andre Volkers, Marcel Puyn
  • Process for preparing polycarbonate
    Patent number: 6495654
    Abstract: A process for quenching a catalyst used in the manufacture of polycarbonate by melt polycondensation of a dihydroxy compound and a diester. The process includes adding a sulfonic acid ester quencher to the polycarbonate and extruding the polycarbonate, wherein the amount of sulfonic acid ester added to the polycarbonate is effective to reduce the amount of branching species generated during extrusion of the polycarbonate to less than 100 parts per million. The catalyst used in the melt polycondensation reaction is selected from the group consisting of sodium dihydrogen phosphite, cesium dihydrogen phosphate and disodium magnesium ethylenediaminetetraacetic acid.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: December 17, 2002
    Assignee: General Elecrric Company
    Inventors: Andre Volkers, Marcel Puyn