Patents by Inventor YVONNE FRENTZEN

YVONNE FRENTZEN 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 a melt-processable polyamide composition
    Publication number: 20060194941
    Abstract: The invention relates to a process for preparing a melt-processable polylactam by contacting caprolactam monomer with an anionic polymerization catalyst chosen from the group consisting of magnesium-lactamates and magnesium-lactamate forming compounds and acyllactam, polymerizing said monomer and contacting the resulting polylactam with a protic compound. The resulting polylactam has a good meltstability and a low degree of branching.
    Type: Application
    Filed: February 11, 2004
    Publication date: August 31, 2006
    Inventors: Albert Van Geenen, Cornelia Bronsaer, Yvonne Frentzen, Stanislaus Mutsers, Nicolaas Janssen
  • Process for preparing a melt-processable polyamide composition
    Publication number: 20060173156
    Abstract: The invention relates to a process for preparing a melt-processable polylactam by contacting caprolactam monomer with an anionic polymerization catalyst, polymerizing said monomer and contacting the resulting polylactam with a protic compound. The anionic polymerization catalyst is chosen from the group consisting of alkali-earth-metal-lactamates and alkali-earth-metal-lactamate forming compounds and the protic compound has a pKa larger than 14. The resulting polylactam has a good melt-stability and very low cyclic dimer content.
    Type: Application
    Filed: February 11, 2004
    Publication date: August 3, 2006
    Inventors: Albert Van Geenen, Cornelia Bronsaer, Yvonne Frentzen, Stanislaus Mutsers, Nicolaas Janssen
  • PROCESS FOR THE SEPARATION OF A KETOXIME OR ALDOXIME FROM AN AMIDE
    Publication number: 20020005343
    Abstract: The invention relates to a process for the separation of a ketoxime or aldoxime from a ketoxime- or aldoxime-containing amide mixture in which the ketoxime or aldoxime is separated from the amide mixture by means of distillation.
    Type: Application
    Filed: January 7, 1999
    Publication date: January 17, 2002
    Inventors: YVONNE FRENTZEN, NICOLAAS HAASEN, HENRICUS F.W. WOLTERS