Patents by Inventor Sjef Berndsen

Sjef Berndsen 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).

  • Polycarbonate with reduced color
    Patent number: 7645851
    Abstract: A method of making polycarbonate includes the steps of forming polycarbonate by a melt transesterification method using an activated diaryl carbonate, and compounding the polycarbonate with a phosphorus-containing compound that has an abstractable proton or hydrolyzable group. The phosphorus-containing compound is compounded with the polycarbonate in an amount sufficient to result in an improvement in the color properties of the polycarbonate as compared to pellets formed from the same polycarbonate without addition of the phosphorus-containing compound.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: January 12, 2010
    Assignee: Sabic Innovative Plastics IP B.V.
    Inventors: Sjef Berndsen, Hans Peter Brack, Bernd Jansen, Edward Kung, Daniel Lowery, Patrick Joseph McCloskey, Dennis Karlik, Gerardo Hidalgo Llinas
  • Method for making molded polycarbonate articles with improved color
    Patent number: 7541420
    Abstract: A method for preparing a molded article includes the steps of (a) obtaining a polycarbonate resin and (b) molding the polycarbonate resin. The polycarbonate resin is made by a transesterification reaction using an activated diaryl carbonate such that the polycarbonate is susceptible to the formation of internal ester linkages (IEL). The method occurs with the proviso that the polycarbonate resin, the molding conditions or both are selected to control the amount of IEL formed during the molding process to a level of less than 0.4 mol %.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: June 2, 2009
    Assignee: Sabic Innovative Plastics IP B.V.
    Inventors: Sjef Berndsen, Hans Peter Brack, Bernd Jansen, Jan Henk Kamps, Edward Kung, Daniel Lowery, Patrick Joseph McCloskey, Paul Michael Smigelski, Jr., Dennis Willemse
  • Method for Making Molded Polycarbonate Articles with Improved Color
    Publication number: 20080004407
    Abstract: A method for preparing a molded article includes the steps of (a) obtaining a polycarbonate resin and (b) molding the polycarbonate resin. The polycarbonate resin is made by a transesterification reaction using an activated diaryl carbonate such that the polycarbonate is susceptible to the formation of internal ester linkages (IEL). The method occurs with the proviso that the polycarbonate resin, the molding conditions or both are selected to control the amount of IEL formed during the molding process to a level of less than 0.4 mol %.
    Type: Application
    Filed: March 20, 2007
    Publication date: January 3, 2008
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Sjef Berndsen, Hans-Peter Brack, Bernd Jansen, Jan Henk Kamps, Edward Kung, Daniel Lowery, Patrick Joseph McCloskey, Paul Michael Smigelski, Dennis Willemse
  • Polycarbonate with Reduced Color
    Publication number: 20080004379
    Abstract: A method of making polycarbonate includes the steps of forming polycarbonate by a melt transesterification method using an activated diaryl carbonate, and compounding the polycarbonate with a phosphorus-containing compound that has an abstractable proton or hydrolyzable group. The phosphorus-containing compound is compounded with the polycarbonate in an amount sufficient to result in an improvement in the color properties of the polycarbonate as compared to pellets formed from the same polycarbonate without addition of the phosphorus-containing compound.
    Type: Application
    Filed: March 20, 2007
    Publication date: January 3, 2008
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Sjef Berndsen, Hans Peter Brack, Bernd Jansen, Dennis Karlik, Edward Kung, Daniel Lowery, Patrick Joseph McCloskey