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Abstract

Use of isotactic polypropylene homopolymers or copolymers in processes in which the polypropylene solidifies from a melt, wherein for enhanced speed of solidification of the polypropylene the polypropylene has a melt temperature and a crystallisation temperature not more than 50.degree. C. less than the melt temperature resulting from the polypropylene having been produced using a metallocene catalyst component having the general formula: R'(C.sub.p R.sub.1 R.sub.2 R.sub.3)(C.sub.p 'R.sub.n ')MQ.sub.2. C.sub.p and C.sub.p ' are a substituted cyclopentadienyl ring, and a sybstituted or unsubstituted fluorenyl ring, respectively. R' is a structural bridge; R.sub.1 is a substituent on the cyclopentadienyl ring distal to the bridge. The distal substituent comprises a bulky group of the formula XR*.sub.a; X is chosen from Group IVA. M is a Group IVB transition metal or vanadium and each Q is hydrocarbyl having 1 to 20 carbon atoms or is a halogen.

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First Claim