Petroleo Brasileiro S.a. - Petrobras

Polialden Petroquimica S.a.

Roberto Barcala Haag

Jaime Correia Da Silva

Dellyo Ricardo Dos Santos Alvares

Juan Raul Abarca

Odyr Do Coutto Filho

A fiber and a process for obtaining same from a high-modulus polyethylene, extrudable in state-of-the-art equipment and in the absence of previous solubilization in any kind of organic solvent is described, the process comprising providing such a polyethylene, introducing it in a state-of-the-art extruder, extruding it according to a temperature pattern, obtaining an extrudate that is directed to a cooling bath to have its temperature reduced, then directing the extrudate to a first stretcher where it is stretched or drawn into a fiber of improved tenacity, at a first velocity v, then heating the fiber at nearly 90&#xb0; C. and then directing said fiber to a second stretcher to be drawn at a final velocity v, wherein v&#x3c;v, at a draw ratio of 2/1 until 65/1. The tenacity of the polyethylene fiber obtained by the said process attains at least 4 gf/den, which makes it useful to naval and offshore applications.

Fiber and process for obtaining same from high-modulus, extrudable polyethylene

Process of making a fiber

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.

Process for preparing a Ziegler type catalytic system and process for

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Rio de Janeiro, Brazil

Roberto Barcala Haag