| 摘要 |
Polypropylene waxes having good crystallinity and good processing properties can be obtained by solution polymerisation at a temperature above 110 DEG C if the polymerisation is carried out in the presence of a catalyst system prepared from an alkoxymagnesium compound, a tetravalent titanium compound, a silicon compound and an organoaluminium compound. The polypropylene waxes prepared by the process are hard, tough, colourless, non-tacky, thermostable, readily grindable products having an isotacticity, determined by IR spectroscopy, of greater than 70% and a melt viscosity of from 50 to 4000 mPa.s, measured at 170 DEG C. The waxes are suitable, for example, as base materials for pigment preparation, for scratchproofing of printing inks, for matting surface coating materials (paints, lacquers, enamels, varnishes), as assistants (auxiliaries) in the processing of plastics, for example as lubricants and release agents, as a formulation component in phototoners, and as melting point elevators. |
