Patents by Inventor Wilhelmus G. Duyzings

Wilhelmus G. Duyzings 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 thermoplastic with high monomer conversion
    Patent number: 4871802
    Abstract: The invention relates to a process for the preparation of a thermoplastic consisting of a vinylaromatic compound, acrylonitril and a butadiene rubber, by means of a two-step polymerization reaction characterized in that 0.1-10 wt. % of the butadiene rubber based on the entire composition, is replaced by an acrylate rubber in the second step. The process results in a decreased concentration of residual monomers.
    Type: Grant
    Filed: February 9, 1988
    Date of Patent: October 3, 1989
    Assignee: Stamicarbon B.V.
    Inventors: Wilhelmus G. Duyzings, Lambert Van Lumig
  • Process for the preparation of a copolymer of .alpha.-methylstyrene
    Patent number: 4340723
    Abstract: An improved process for the preparation of copolymers of .alpha.-methylstyrene and other co-monomers such as acrylonitrile styrene, methyl methacrylate and the like, wherein a substantially water-immiscible softener is employed, particularly prior to coagulation of the latex formed of the copolymer, whereby an improved product of higher bulk density and easier to employ in a subsequent processing is obtained.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: July 20, 1982
    Assignee: Stamicarbon, B.V.
    Inventors: Wilhelmus G. Duyzings, Jozef L. M. van der Loos, Jan Tijssen