Patents by Inventor Ernst E. G. Kloosterman

Ernst E. G. Kloosterman 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 production of polyamide-6 from epsilon-caprolactam
    Patent number: 6528614
    Abstract: The invention relates to a process for the production of polyamide-6 by polymerization of &egr;-caprolactam with full re-use of extracted caprolactam and oligomers. The extract is not subjected to a pretreatment for reduction of the cyclic dimer content. By carrying out the polymerization in two steps, the first at an elevated pressure, but lower than the vapor pressure of the reaction mixture supplied, and the second at approximately atmospheric or reduced pressure, the cyclic dimer content of the polymerizate leaving the second polymerization step is kept at a constant level. The process offers a high degree of flexibility in terms of production capacity and composition and proportion of recycled lactam in the lactam feed for the polymerization.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: March 4, 2003
    Assignee: DSM N.V.
    Inventors: Ernst E. G. Kloosterman, Albert A. A. Van Geenen, Cornelis C. L. Van Der Sluijs, Erik E. R. Peerlkamp, Theo T. K. Schulpen, Ronald R. J. H. Hoenen
  • Process for the production of polyamide-6 from epsilon-caprolactam
    Publication number: 20010047075
    Abstract: The invention relates to a process for the production of polyamide-6 by polymerization of &egr;-caprolactam with full re-use of extracted caprolactam and oligomers. The extract is not subjected to a pretreatment for reduction of the cyclic dimer content. By carrying out the polymerization in two steps, the first at an elevated pressure, but lower than the vapor pressure of the reaction mixture supplied, and the second at approximately atmospheric or reduced pressure, the cyclic dimer content of the polymerizate leaving the second polymerization step is kept at a constant level. The process offers a high degree of flexibility in terms of production capacity and composition and proportion of recycled lactam in the lactam feed for the polymerization.
    Type: Application
    Filed: March 23, 2001
    Publication date: November 29, 2001
    Inventors: Ernst E.G. Kloosterman, Albert A.A. Van Geenen, Cornelis C.L. Van Der Sluijs, Erik E.R. Peerlkamp, Theo T.K. Schulpen, Ronald R.J.H. Hoenen