A method to produce very stiff polypropylene

The invention relates to a copolymer or a method for producing a propylene homopolymer, comprising the following steps: (i) one or more monomer feed to the propylene and argon, and can be to The reactor, ethylene by the variation of the feed to The reactor, in(ii) is at the presence of catalyst, a propylene homopolymer or copolymer the first component in the reactor, Wherein(iii) the first component in the reactor, WhereinAnd (b) a propylene homopolymer or copolymer the second component in the reactor, R2, wherein the melt flow rate of the propylene homopolymer or copolymer MFR (2.16kg, 230℃) is higher than the first of the melt flow rate MFR (2.16kg,) 230℃.