Highly viscous, largely amorphous polyolefin

1. A polyolefin comprising the following monomer units:

a) not more than 25% by weight of units which are derived from ethene,

b) not more than 75% by weight of units which are derived from propene and

c) from 5 to 100% by weight of units which are derived from an α-olefin having 4 to 20 carbon atoms,

the polyolefin having the following parameters:

d) a weight-average molecular weight in the range of from 70 000 to 10 000 000 g/mol,

e) a polydispersity in the range of from 4 to 60,

f) a melt viscosity, measured by oscillation rheometry at a shear rate of 1 Hz at 190° C., in the range of from 100 000 to 100 000 000 mPa·s,

g) a needle penetration in the range of from 3 to 70·0.1 mm,

h) an enthalpy of fusion in the range of from 2 to 100 J/g,

i) a glass transition temperature T g in the range of from −15° C. to −80° C., and

j) a final melting point of the crystalline fraction in the range of from 85 to 175° C.

2. The polyolefin according to claim 1 , wherein the weight-average molecular weight is from 100 000 g/mol to 10 000 000 g/mol.

3. The polyolefin according to claim 1 , produced by a process comprising polymerizing α-olefin monomers in the presence of a TiCl 3 .(AlCl 3 ) n mixed catalyst, n being from 0.2 to 0.5, and a trialkylaluminum compound cocatalyst with a molar ratio of mixed catalyst to cocatalyst of from 1:1 to 1:10.

4. The polyolefin according to claim 1 , wherein said polyolefin has an alpha value in the range of from 0.5 to 0.9.

5. A polyolefin composition comprising the following components:

I. from 0.1 to 99.9% by weight of the polyolefin according to claim 1 , and

II. from 99.9 to 0.1% by weight of at least one polyolefin selected from the group consisting of ethylene polymer, isotactic polypropylene polymer, syndiotactic polypropylene polymer, isotactic poly-1-butene and syndiotactic poly-1-butene,

wherein the weight percents are based on the total combined weight of components I and II.

6. The polyolefin composition according to claim 5 , wherein component II is a mixture of an ethylene polymer and a polyolefin selected from the group consisting of isotactic polypropylene polymer, syndiotactic polypropylene polymer, isotactic poly-1-butene and syndiotactic poly-1-butene.

7. A molding material for producing shaped articles comprising the polyolefin composition according to claim 5 .

8. A molding material for producing shaped articles comprising the following components:

I. from 0.1 to 50% by weight of the polyolefin according to claim 1 , and

II. from 99.9 to 50% by weight of an isotactic or syndiotactic propylene polymer,

wherein the weight percents are based on the total combined weight of components I and II.

9. A process for producing a shaped article comprising molding the molding material of claim 8 into said shaped article.

10. A process for producing a sealing sheet comprising molding the molding material of claim 8 into said sealing sheet.

11. A shaped article produced by the process according to claim 9 .

12. A sealing sheet produced by the process according to claim 10 .

13. A process for producing a shaped article comprising molding the polyolefin composition of claim 5 into said shaped article.

14. A process for producing a sealing sheet comprising molding the polyolefin composition of claim 5 into said sealing sheet.

15. A shaped article produced by the process according to claim 13 .

16. A sealing sheet produced by the process according to claim 14 .

17. A process for producing a shaped article comprising molding the polyolefin of claim 1 into said shaped article.

18. A process for producing a sealing sheet comprising molding the polyolefin of claim 1 into said sealing sheet.

19. A shaped article produced by the process according to claim 17 .

20. A sealing sheet produced by the process according to claim 18 .

21. The polyolefin according to claim 1 , wherein units derived from ethene are present.

22. The polyolefin according to claim 3 , wherein polymerizing is carried out at a temperature of 70 to 220° C.