Patent ID: 8759452

Claim:
A process for the production of a polypropylene composition comprising a propylene homo- or copolymer (A) with a polydispersity index (PI), determined according ISO 6721-1, of at least 5.8 Pa −1 , in an amount of at least 80 wt %; and an inorganic filler (B); wherein the process comprises preparing the propylene homo- or copolymer (A) in one or more reactors wherein in at least one reactor the process comprises the following steps: a) feeding one or more (co)monomers and hydrogen to the reactor, whereby the hydrogen concentration in said reactor is periodically varied; b) preparing the propylene homo- or copolymer (A) in the presence of an olefin polymerization catalyst; and c) withdrawing the propylene homo- or copolymer (A) from said at least one reactor, whereby the following relation is fulfilled: P/Tau>2.0, wherein P is the time of one variation period of the hydrogen concentration in said at least on reactor; and Tau is the average residence time of the polymer in said at least one reactor.