Boehmites as fillers in polyolefins
Publication Date: 2005-Nov-02
The IP.com Prior Art Database
Madelein Kleyn: ATTORNEY [+5]
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.
Piet Makhubela1, Niall Marshall2, Olaf Torno3, Udo Wahner1
1Sasol Polymers, Polymer Technology Centre, Box, 72, Modderfontein 1645,
2Sasol Wax, Polymer Additives,
PO Box1, Sasolburg, 1947,
Germany, Anckelmannsplatz 1, 20537
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.
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)....