Claims
- 1. A crystalline propylene polymer composition comprising:
(a) from 10 to 90 weight percent of a crystalline propylene homopolymer composition comprising a first propylene homopolymer and a second propylene homopolymer; and (b) from 90 to 10 weight percent of a crystalline propylene copolymer composition comprising a first propylene copolymer and a second propylene copolymer, the first propylene copolymer and second propylene copolymer comprising from 0.05 to 15 weight percent (based on the total weight of the crystalline propylene polymer composition) of a comonomer; wherein the crystalline propylene polymer composition has a molecular weight distribution (Mw/Mn) in the range of from 2.1 to 10; and wherein the propylene homopolymer composition and the propylene copolymer composition are obtained in separate stages using a single metallocene catalyst system comprising two different metallocene catalyst components.
- 2. The composition of claim 1, wherein the comonomer weight percent is in the range of from 0.1 to 10.0.
- 3. The composition of claim 1, wherein the comonomer is selected from the group consisting of ethylene, 1-butene, 1-pentene, 1-hexene, and 1-octene.
- 4. The composition of claim 1, wherein the weight percent of the crystalline propylene homopolymer composition is from 20 to 80 weight percent.
- 5. The composition of claim 1, wherein the molecular weight distribution is from 2.5 to 7.0.
- 6. The composition of claim 1, wherein the hexane extractables level is less than 2.0 wt % as measured by 21 CFR 177.1520(d)(3)(ii).
- 7. The composition of claim 1, wherein the single metallocene catalyst system further comprises an alkyl alumoxane.
- 8. The composition of claim 1, wherein the single metallocene catalyst system further comprises an alkyl alumoxane and porous support material.
- 9. The composition of claim 1, wherein the two different metallocenes catalyst components are represented by the formula:
- 10. A crystalline propylene polymer composition comprising:
(a) from 10 to 90 weight percent of a isotactic crystalline propylene homopolymer composition comprising a first propylene homopolymer and a second propylene homopolymer, the isotactic crystalline propylene homopolymer composition having a molecular weight distribution of less than 3.0; and (b) from 90 to 10 weight percent of a crystalline propylene copolymer composition comprising a first propylene copolymer and a second propylene copolymer, the first propylene copolymer and second propylene copolymer comprising from 0.05 to 15 weight percent (based on the total weight of the crystalline propylene polymer composition) of a comonomer, the crystalline propylene copolymer composition having a molecular weight distribution of less than 3.0; wherein the crystalline propylene polymer composition has a molecular weight distribution (Mw/Mn) in the range of from 2.1 to 10; and wherein the isotactic crystalline propylene homopolymer composition and crystalline propylene copolymer composition are obtained in separate stages using a single metallocene catalyst system comprising two different metallocene catalyst components.
- 11. A process for preparing a crystalline propylene polymer composition comprising the steps of:
(a) polymerizing propylene in a first stage; (b) copolymerizing propylene and a comonomer in a second stage; and (c) recovering the crystalline propylene polymer composition comprising from 0.05 to 15 weight percent of a comonomer (based on the total weight of the crystalline propylene polymer composition); wherein the steps (a) and (b) are conducted in the presence of a single metallocene catalyst system comprising two different metallocene catalyst components.
- 12. The process of claim 11, wherein the comonomer is selected from the group consisting of ethylene, 1-butene, 1-pentene, 1-hexene, and 1-octene.
- 13. The process of claim 11, wherein the crystalline propylene polymer composition comprises from 0.5 to 8 weight percent of the comonomer (based on the total weight of the crystalline propylene polymer composition).
- 14. The process of claim 11, wherein the crystalline propylene polymer composition comprises from 0.5 to 5 weight percent of the comonomer (based on the total weight of the crystalline propylene polymer composition).
- 15. The process of claim 11, wherein the two different metallocenes catalyst components are represented by the formula:
- 16. The process of claim 11, wherein the single metallocene catalyst system further comprises an alkyl alumoxane activator and porous support material.
- 17. A film comprising a crystalline propylene polymer composition comprising:
a) from 10 to 90 weight percent of a crystalline, isotactic propylene homopolymer composition comprising a first propylene homopolymer and a second propylene homopolymer; and b) from 90 to 10 weight percent of a crystalline propylene copolymer composition comprising a first propylene copolymer and a second propylene copolymer, the first propylene copolymer and second propylene copolymer comprising from 0.05 to 15 weight percent (based on the total weight of the crystalline propylene polymer composition) of a comonomer; wherein the crystalline propylene polymer composition is prepared using a single metallocene catalyst system comprising two different metallocene catalyst components; and wherein the crystalline propylene polymer composition has a molecular weight distribution from 2.1 to 10.
- 18. The film of claim 17, wherein the film is biaxially oriented at least once in at least one direction.
- 19. The film of claims 17, wherein the film is oriented sequentially.
- 20. The film of claims 17, wherein the film is oriented simultaneously.
- 21. A film comprising a crystalline propylene polymer composition comprising:
a) from 10 to 90 weight percent of a crystalline, isotactic propylene homopolymer composition comprising a first propylene homopolymer and a second propylene homopolymer, the crystalline, isotactic propylene homopolymer composition having a molecular weight distribution of less than 3; and b) from 90 to 10 weight percent of a crystalline propylene copolymer composition comprising a first propylene copolymer and a second propylene copolymer, the crystalline propylene copolymer composition having a molecular weight distribution of less than 3, the first propylene copolymer and the second propylene copolymer comprising from 0.05 to 15 weight percent (based on the total weight of the crystalline propylene polymer composition) of a comonomer; wherein the crystalline propylene polymer composition has a molecular weight distribution in the range of from 2.1 to 10.
- 22. The film of claim 21, wherein the film is biaxially oriented at least once in at least one direction.
- 23. The film of claims 21, wherein the film is oriented sequentially or simultaneously.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. Ser. No. 08/916,699, filed Aug. 22, 1997, now abandoned, which claims priority to Provisional Serial No. 60/025,398, filed Sep. 4, 1996, the disclosures of which are incorporated by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60025398 |
Sep 1996 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08916699 |
Aug 1997 |
US |
Child |
10303448 |
Nov 2002 |
US |