US4500682A
Expired / Lapsed
US
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High melt-viscoelastic polypropylene for post-processed sheets and for blow molding
Assignee: JNC Corp
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Filing: 1983-05-18
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Granted: 1985-02-19
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Expires: 2003-05-18
Abstract
Abstract A polypropylene (PP) having a superior post-processability and blow moldability is provided, which PP is obtained by polymerizing propylene at multiple stages using a catalyst comprising a TiCl 3 composition, an organoaluminum compound and a molecular weight (M.W.) modifier, the resulting final polymer comprising a higher M.W. portion and a lower M.W. portion having a melt flow index of 0.03 to 2.0 g/10 min., and between this index and a melt flow index (10.2 kg/10 minutes, 230° C.) as measured under 5 times the load applied in the measurement of the former melt flow index, there being a relationship log HMI≧0.922 log MI+1.44, and the final polymer consisting of 40 to 60 weight % of a PP portion corresponding to the higher M.W. portion and 60 to 40 weight % of a PP portion corresponding to the lower M.W. portion.
Inventors
- 👤 Hiromasa Chiba
- 👤 Kenjiro Obama
- 👤 Shunji Kawazoe
- 👤 Takahiro Oka
- 👤 Akihiro Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:41
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/04; C08F10/06; C08F2/00; C08F110/00; C08F110/04; C08F110/06; C08F210/00; C08F210/04; C08F210/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
188 words
A polypropylene for post-processed sheets and for blow molding which is characterized in that (1) said polypropylene is obtained by polymerizing propylene at multiple stages by the use of a catalyst comprising a titanium trichloride composition and an organoaluminum compound and a molecular weight modifier; (2) the resulting final polymer comprising a higher molecular weight portion and a lower molecular weight portion has a melt flow index (MI) of 0.03 to 2.0 g/10 minutes, and between this melt flow index and a melt flow index (HMI) (10.2 kg/10 minutes, 230° C.) as measured under 5 times the load applied in the measurement of the former melt flow index, there is a relationship log HMI≧0.922 log MI+1.44 (1); and (3) said final polymer consists of 40 to 60% by weight of a polypropylene portion corresponding to said higher molecular weight portion and 60 to 40% by weight of a polypropylene portion corresponnding to said lower molecular weight portion, the intrinsic viscosity of the higher molecular weight portion, [η] H , and that of the lower molecular weight portion N L , having the relationship: 3.0≦[η] H -[η] L ≦6.5.
Claim 2
Dependent Claim
188 words
A polypropylene for post-processed sheets and for blow molding which is characterized in that (1) said polypropylene is obtained by polymerizing propylene at multiple stages by the use of a catalyst comprising a titanium trichloride composition and an organoaluminum compound and a molecular weight modifier; (2) the resulting final polymer comprising a higher molecular weight portion and a lower molecular weight portion has a melt flow index (MI) of 0.03 to 2.0 g/10 minutes, and between this melt flow index and a melt flow index (HMI) (10.2 kg/10 minutes, 230° C.) as measured under 5 times the load applied in the measurement of the former melt flow index, there is a relationship log HMI≧0.922 log MI+1.44 (1); and (3) said final polymer consists of 40 to 60% by weight of a polypropylene portion corresponding to said higher molecular weight portion and 60 to 40% by weight of a polypropylene portion corresponnding to said lower molecular weight portion, the intrinsic viscosity of the higher molecular weight portion, [η] H , and that of the lower molecular weight portion N L , having the relationship: 3.0≦[η] H -[η] L ≦6.5.
Claim 3
Dependent Claim
38 words
A polypropylene according to claim 1 wherein propylene is copolymerized with ethylene at at least one of said multiple stages and the ethylene content in said final polymer is in the range of 1 to 15% by weight.
Claim 4
Dependent Claim
188 words
A process for producing a polypropylene for post-processed sheets and for blow molding which is characterized in that propylene is polymerized at multiple stages by the use of a catalyst comprising a titanium trichloride composition and an organoaluminum compound and a molecular weight modifier, to obtain a final polymer comprising a higher molecular weight portion and a lower molecular weight portion, this final polymer having a melt flow index (MI) of 0.03 to 2.0 g/10 minutes, and between this melt flow index and a melt flow index (HMI) (10.2 kg/10 minutes, 230° C.) as measured under 5 times the load applied in the measurement of the former melt flow index, there being a relationship log HMI≧0.922 log MI+1.44 (1), and said final polymer consisting of 40 to 60% by weight of a polypropylene portion corresponding to said higher molecular weight portion and 60 to 40% by weight of a polypropylene portion corresponding to said lower molecular portion, the intrinsic viscosity of the higher molecular weight portion, [η] H , and that of the lower molecular weight portion N L , having the relationship: 3.0≦[η] H -[η] L ≦6.5.
Claim 5
Dependent Claim
188 words
A process for producing a polypropylene for post-processed sheets and for blow molding which is characterized in that propylene is polymerized at multiple stages by the use of a catalyst comprising a titanium trichloride composition and an organoaluminum compound and a molecular weight modifier, to obtain a final polymer comprising a higher molecular weight portion and a lower molecular weight portion, this final polymer having a melt flow index (MI) of 0.03 to 2.0 g/10 minutes, and between this melt flow index and a melt flow index (HMI) (10.2 kg/10 minutes, 230° C.) as measured under 5 times the load applied in the measurement of the former melt flow index, there being a relationship log HMI≧0.922 log MI+1.44 (1), and said final polymer consisting of 40 to 60% by weight of a polypropylene portion corresponding to said higher molecular weight portion and 60 to 40% by weight of a polypropylene portion corresponding to said lower molecular portion, the intrinsic viscosity of the higher molecular weight portion, [η] H , and that of the lower molecular weight portion N L , having the relationship: 3.0≦[η] H -[η] L ≦6.5.
Claim 6
Dependent Claim
42 words
A process for producing a polypropylene according to claim 3 wherein propylene is copolymerized with ethylene at at least one of said multiple stages and the ethylene content in said final polymer is in the range of 1 to 15% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |