Claims
- 1. A polypropylene comprising at least 10 alternating blocks of syndictactic sequence and isotactic sequence, wherein the realative frequency of the sequence in the polypropylene is in the range 1:3 to 3:1, as determined by the ratio of mmmm pentads to rrrr pentads in 13C NMR spectroscopy.
- 2. A polypropylene according to claim 1, wherein the relative frequency of the sequences is approximately 1:1.
- 3. A polypropylene according to claim 1, wherein the syndiotactic and isotactic sequences each have an average sequence length in the range 5 to 20.
- 4. A polypropylene according to claim 3, wherein the average sequence length is in the range 5 to 10.
Priority Claims (1)
Number |
Date |
Country |
Kind |
98111334 |
Jun 1998 |
EP |
|
Parent Case Info
This is a Divisional Application of application Ser. No. 09/336,350, filed Jun. 18, 1999 now U.S. Pat. No. 6,184,318.
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5334677 |
Razavi et al. |
Aug 1994 |
|
5892078 |
Göres et al. |
Apr 1999 |
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0742227 |
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Jan 1998 |
EP |