Patents by Inventor Roberto B. Haag

Roberto B. Haag 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 Ziegler type catalytic system and process for preparing ultra high molecular weight polyethylene
    Patent number: 4983693
    Abstract: Description of the preparation of a Ziegler type catalyst system through impregnation of a special alumina with 0.8-1.0% by weight of titanium derived from a dilute solution of titanium halide in n-hexane, the activator employed being triisobutylaluminum or triethylaluminum at an (Al)/(Ti) molar ratio of 2.5/1 to 80/1 in the catalyst. The catalyst system has high efficiency and yield, and leads to polyethylenes of excellent physical and mechanical properties which make it particularly suitable for use in engineering plastics.
    Type: Grant
    Filed: December 29, 1988
    Date of Patent: January 8, 1991
    Assignees: Petroleo Brasileiro S.A. -Petrobras, Polialden Petroquimica S.A.
    Inventors: Roberto B. Haag, Jaime C. da Silva, Juan R. Q. Abarca, Odyr do Coutto Filho