Kautschuk Gummi Kunststoffe, Vol.56, No.11, 590-594, 2003
Gas-phase EPDM based on metallocene catalysis
A new EPDM Nordel rubber is to the market, representing the fusion of the two latest technologies, gas phase polymerisation with metallocene catalysis. In this paper we look at the character of the polymer and its method of manufacture, in order to understand how it can form a complementary product range to the existing solution polymer, Nordel IP, made also with metallocene catalyst. The introductory product range of 5 polymers is described, with two of them selected to show comparisons of critical compound and vulcanisate properties against comparable solution polymerised grades. The first, MG NDR 47085, is a traditional high viscosity semicrystalline type which has been optimised to meet modern test specifications. The second, MG NDR 47130 is the first of a new class of very high viscosity polymers designed to give similar physical properties when containing even higher levels of extension of filler and oil, than traditional polymers.
Keywords:EPDM;gas phase polymerisation;solution polymerisation;metallocene catalyst;Mooney viscosity;mixing time;tensile strength;compression set