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Boehmites as fillers in polyolefins Disclosure Number: IPCOM000130709D
Publication Date: 2005-Nov-02
Document File: 4 page(s) / 2M

Publishing Venue

The Prior Art Database

Related People

Madelein Kleyn: ATTORNEY [+4]

Related Documents

EP1580223: PATAPP


The invention provides an alumina boehmite powder coating, coating the boehmite particles with a wax, and mixing the wax coated boehmite particles with a polyolefin polymer. Preferably the polymer is a homopolymer in the form of pellets.

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Boehmites as fillers in polyolefins

Piet Makhubela1, Niall Marshall2, Olaf Torno3, Udo Wahner1

1Sasol Polymers, Polymer Technology Centre, Box, 72, Modderfontein 1645,

South Africa

2Sasol Wax, Polymer Additives,

PO Box


, Sasolburg, 1947,

South Africa



, Anckelmannsplatz 1, 20537




1.              Background

In recent years substantial resources have been devoted to the development of fillers in order to enhance polymer properties. In particular, research has focused on nanocomposite materials.

This disclosure reports on the use of boehmitic aluminas in polyolefins.

2.              Experimental

Various alumina, Disperal ® 20, Disperal ® HP 22, Disperal ® 40, Disperal ® HP 40 and Disperal ® 60 were extruded with a polypropylene powder. The amount of Disperal ® compounded with the polypropylene polymer varied from 1 to 15% (by weight). Subsequently, the mixture was injection moulded in order to generate test specimens for mechanical tests. Mechanical properties were determined according to ISO methods. The experimental data reported in this disclosure refers to polymer composite materials obtained from a base polypropylene compounded with 5 % boehmitic alumina.

3.              Results and discussion

Commercially, boehmitic aluminas are available in the form of agglomerates with micrometer dimensions as shown for Disperal ® 40 by scanning electron microscopy (SEM) (see Figure 1). Transmission electron microscopy (TEM) pictures of the polymer composite feature well dispersed boehmitic aluminas with nanometer dimensions in the polymer as shown for Disperal ® 40 in polypropylene (see Figure 2)....