| abstract |
Ziegler-Natta catalyst system, contains (a) a titanium-containing solid component derived from a titanium compound, a magnesium compound, a halogenating agent and an electron donor, (b) an aluminium compound and (c) an organosilicon compound of formula R<1>R<2>Si(OR<3>)2 (I) as additional electron donor, in which R<1> = 1-10C alkyl or 3-8C cycloalkyl; R<2> = 2,4,4,6,6-pentamethylheptyl; R<3> = 1-8C alkyl. Also claimed is (i) a process for the production of polymers from 2-10C alk-1-enes by polymerisation for 1-10 hours at 20-150 degrees C and 1-100 bar in presence of this catalyst system; (ii) polymers of 2-10C alk-1-enes obtained by this process; and (iii) film, fibres and mouldings obtained from these polymers. |