Patents by Inventor Klaas Ijntema

Klaas Ijntema 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 degradation of (co)polymers of propylene
    Patent number: 4556695
    Abstract: A process for the degradation of (co)polymers using as degradants chlorinated 1,1,2,2-tetramethyl-1,2-diphenyl ethane (chlorinated bicumyl) and/or derivatives thereof carrying alkyl substituents in the aromatic nuclei. The present degradants generally are mixtures of bicumyls having varying degrees of chlorination. They may be employed in combination with usual antioxidants and/or UV-stabilizers and display higher activity than bicumyl itself.
    Type: Grant
    Filed: June 25, 1984
    Date of Patent: December 3, 1985
    Assignee: Akzo N.V.
    Inventor: Klaas Ijntema