Patents by Inventor Nicolaas P. Nagtzaam

Nicolaas P. Nagtzaam 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).

  • Device and process for recovering polymer from a solution
    Patent number: 4686279
    Abstract: The invention relates to a device and a process for recovering polymer from a melt or solution containing volatile components. The device consists of an evaporating zone passing, via a metering device, which can function also as a pressure-reducing device, into a devolatilizing extruder. The metering and pressure-reducing device makes it possible also to process highly viscous melts of high-molecular polymers and to fill the extruder screws incompletely so that substantial devolatilization is realized in the extruder.
    Type: Grant
    Filed: March 10, 1986
    Date of Patent: August 11, 1987
    Assignee: Stamicarbon B.V.
    Inventors: Nicolaas P. Nagtzaam, Cornelis Bronke, Albert J. H. Brasz
  • Process for the preparation of polymer melts which are substantially free of volatile components
    Patent number: 4452977
    Abstract: A process for the preparation of alkene polymer melts being substantially free of volatile components comprises introducing an alkene polymer melt having a melt index of less than 4 dg/min and a content of volatile components of less than 10 percent by weight into a cooled degasification extruder and subjecting the melt in the extruder kneading zone to intense cooling under pressure and in the extruder degasification zone to cooling which is less intense than in the kneading zone and under reduced pressure.
    Type: Grant
    Filed: June 8, 1982
    Date of Patent: June 5, 1984
    Assignee: Stamicarbon B.V.
    Inventors: Albert J. H. Brasz, Nicolaas P. Nagtzaam, Cornelis Bronke