Patents by Inventor Reinard J. M. Steeman

Reinard J. M. Steeman 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 preparation of a homogeneous thermoplastic polymer
    Patent number: 4921906
    Abstract: The invention relates to a process for the preparation of a thermoplastic polymer on the basis of an alkenyl aromatic monomer, an unsaturated dicarboxylic anhydride, and, optionally, a rubber, characterized in that the monomers and/or solution thereof are/is reacted in at least two reaction zones that are in open connection with each other at the top and at the bottom, the reaction mixture being circulated through the reaction zones by means of a mixing device and/or a conveying device.Using the process, a homogeneous product of constant composition is obtained.
    Type: Grant
    Filed: May 27, 1988
    Date of Patent: May 1, 1990
    Assignee: Stamicarbon B.V.
    Inventors: Peter J. N. Meyer, Reinard J. M. Steeman
  • Process for the preparation of a thermoplastic polymer
    Patent number: 4772671
    Abstract: A process for the preparation of a thermoplastic polymer on the basis of an alkenyl-aromatic monomer and an unsaturated dicarboxylic acid comprises the addition of 10 to 100 ppm relative to the polymer wt. % of an acid during polymerization. Suitable acids that can be applied are carboxylic acids, and sulphur- and /or phosphorus-containing acids or their mixtures.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: September 20, 1988
    Assignee: Stamicarbon B.V.
    Inventors: Reinard J. M. Steeman, Peter J. N. Meyer