Claims
- 1. An isoblock polymer of propylene with molecular chains containing isotactic sequences which are separated from one another in each case by one monomer unit of opposite configuration, and 0.5 to 10 mol %, based on the total polymer, of randomly distributed units consisting essentially of units of the formula --(CH.sub.2).sub.4 --, said isotactic sequences being 3 to 50 monomer units in length.
- 2. The isoblock polymer according to claim 1, with molecular chains consisting essentially of isotactic sequences which are separated from one another in each case by one monomer unit of opposite configuration, and containing 0.5 to 10 mol %, based on the total polymer, of randomly distributed units consisting: essentially of units of the formula --(CH.sub.2).sub.4 --, said isoblock polymer having been prepared by polymerizing propylene in the presence of a catalyst comprising a metallocene and an aluminoxane, wherein the metallocene is a bis(indenyl)bis(di-C.sub.1 -C.sub.4 -alkylsilyl)metal dihalide, the metal of said bis(indenyl)bis(di-C.sub.1 -C.sub.4 -alkylsilyl)metal dihalide being a metal of Group IVb of the Periodic Table.
- 3. The isoblock polymer according to claim 2, wherein said metallocene is bis(indenyl)bis(dimethylsilyl)hafnium dichloride or bis(indenyl)bis(dimethylsilyl)-zirconium dichloride.
- 4. A polymer mixture comprising an isoblock polymer according to claim 1.
- 5. A polymer mixture according to claim 4, wherein the polymer mixture is a polypropylene blend.
- 6. A polymer of propylene having a structure containing 0.5 to 10 mol %, based the weight of the polymer, of randomly distributed units consisting essentially of propylene-derived units of the formula --(CH.sub.4).sub.2 --, said isoblock structure being essentially free of syndiotactic and atactic polypropylene chains and the molecular chains of the isoblock polymer consisting essentially of isotactic sequences of 3 to 50 monomer units separated from one another in each ease by one monomer unit of opposite configuration, said polymer of propylene being amorphous or partially crystalline, and, if partially crystalline, having a melting point lower than that of an isotactic polypropylene.
- 7. The polymer of propylene according to claim 6, wherein said polymer has been prepared by polymerizing propylene in the presence of a catalyst comprising a metallocene and an aluminoxane, said metallocene being a bis(indenyl)bis(di-C.sub.1 -C.sub.4 -alkylsilyl)metal dihalide, the metal of said bis(indenyl)bis(di-C.sub.1 -C.sub.4 -alkylsilyl)metal dihalide being a metal of Group IVb of the Periodic Table.
- 8. The polymer of propylene according to claim 7, wherein said metallocene is bis(indenyl)bis(dimethylsilyl)hafnium dichloride or bis(indenyl)bis(dimethylsilyl)zirconium dichloride.
- 9. A polymerized propylene polymer having 0.5 to 10 mol %, based on the total polymer, of randomly-distributed, propylene-derived --(--CH.sub.2 --).sub.4 -- units, said polymer consisting essentially of isotactic polymerized propylene sequences 3 to 50 monomer units in length, said polymerized propylene sequences being separated from one another by one propylene unit of opposite configuration.
- 10. The polymerized propylene polymer according to claim 9, wherein said polymer has been prepared by polymerizing propylene in the presence of a catalyst comprising a metallocene and an aluminoxane, said metallocene being a bis(indenyl)bis(di-C.sub.1 -C.sub.4 -alkylsilyl)metal dihalide, the metal of said bis(indenyl)bis(di-C.sub.1 -C.sub.4 -alkylsilyl)metal dihalide being a metal of Group IVb of the Periodic Table.
- 11. The polymer of propylene according to claim 10, wherein said metallocene is bis(indenyl)bis(dimethylsilyl)hafnium dichloride or bis(indenyl)bis(dimethylsilyl)zirconium dichloride.
- 12. The polymer of propylene according to claim 11, wherein said metallocene is bis(indenyl)bis(dimethylsilyl)hafnium dichloride.
- 13. The polymer as claimed in claim 11, wherein said metallocene is bis(indenyl)bis(dimethylsilyl)zirconium dichloride.
Priority Claims (1)
Number |
Date |
Country |
Kind |
38 26 074.3 |
Jul 1988 |
DEX |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of Ser. No. 08/192,837, now abandoned, which is a continuation-in part of our application Ser. No. 07/978,022, filed Nov. 18, 1992, now abandoned, which was a continuation of application Ser. No. 07/387,218, filed Jul. 28, 1989, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (8)
Number |
Date |
Country |
0069951 |
Jan 1983 |
EPX |
0185918 |
Jul 1986 |
EPX |
0269987 |
Jun 1988 |
EPX |
0269986 |
Jun 1988 |
EPX |
0302424 |
Feb 1989 |
EPX |
0344887 |
Dec 1989 |
EPX |
3726067 |
Feb 1989 |
DEX |
1222892 |
Feb 1971 |
GBX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
192837 |
Feb 1994 |
|
Parent |
387218 |
Jul 1989 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
978022 |
Nov 1992 |
|