US4380608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing propylene-ethylene block copolymer
Assignee: Mitsubishi Chemical Corp
•
Filing: 1982-02-10
•
Granted: 1983-04-19
•
Expires: 2002-02-10
Abstract
Abstract A propylene-ethylene block copolymer in the presence of a catalyst comprises as main components, a solid titanium-containing catalytic component and an organoaluminum compound having the formula AIRm1Cl3-m (R1 represents a C1-20 hydrocarbon moiety; and m is 3>/=m>1.5) by producing a homopolymer of propylene or a propylene-ethylene copolymer by polymerizing propylene or both propylene and ethylene at a vapor phase propylene concentration of 90 mol % or higher based on the sum of propylene and ethylene in a first step and producing a propylene-ethylene block copolymer by copolymerizing propylene and ethylene at a vapor phase propylene concentration of less than 90 mol % based on the sum of propylene and ethylene in the presence of the polymer resulted in the first step and the catalyst in a second step is produced by newly adding an aluminum compound having the formula AlRn2X3-n (R2 represents a C1-20 hydrocarbon moiety; X represents a halogen atom and n is 1.5>/=n>/=0) to the components for the copolymerization in the second step.
Inventors
- 👤 Masayoshi Hasuo
- 👤 Yoshinori Suga
- 👤 Hisashi Kitada
- 👤 Yasuo Maruyama
- 👤 Junichi Gotoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:28
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
178 words
In a continuous process for producing a propylene-ethylene block copolymer in the presence of a catalyst comprising as main components, a solid titanium-containing catalyst component and an organoaluminum compound having the formula AlR.sub.m.sup.1 Cl.sub.3-m (R 1 represents a C 1-20 hydrocarbon moiety; and m is 3≧m>1.5) by producing a homopolymer of propylene or a propylene-ethylene copolymer by polymerizing propylene or both propylene and ethylene at a vapor phase propylene concentration of 90 mol % or higher based on the sum of propylene and ethylene in a first step and producing a propylene-ethylene block copolymer by copolymerizing propylene and ethylene at a vapor phase propylene concentration of less than 90 mol % based on the sum of propylene and ethylene in the presence of the polymer resulting from the first step and the catalyst in a second step, an improvement characterized by newly adding an aluminum compound having the formula AlR.sub.n.sup.2 X.sub.3-n (R 2 represents a C 1-20 hydrocarbon moiety; X represents a halogen atom and n is 1.5≧n≧0) to the components for the copolymerization in the second step.
Claim 2
Dependent Claim
178 words
In a continuous process for producing a propylene-ethylene block copolymer in the presence of a catalyst comprising as main components, a solid titanium-containing catalyst component and an organoaluminum compound having the formula AlR.sub.m.sup.1 Cl.sub.3-m (R 1 represents a C 1-20 hydrocarbon moiety; and m is 3≧m>1.5) by producing a homopolymer of propylene or a propylene-ethylene copolymer by polymerizing propylene or both propylene and ethylene at a vapor phase propylene concentration of 90 mol % or higher based on the sum of propylene and ethylene in a first step and producing a propylene-ethylene block copolymer by copolymerizing propylene and ethylene at a vapor phase propylene concentration of less than 90 mol % based on the sum of propylene and ethylene in the presence of the polymer resulting from the first step and the catalyst in a second step, an improvement characterized by newly adding an aluminum compound having the formula AlR.sub.n.sup.2 X.sub.3-n (R 2 represents a C 1-20 hydrocarbon moiety; X represents a halogen atom and n is 1.5≧n≧0) to the components for the copolymerization in the second step.
Claim 3
Dependent Claim
80 words
The process for producing the block copolymer according to claim 1 wherein said solid titanium-containing catalytic component comprises titanium trichloride, an aluminum halide compound having the formula AlR.sub.p.sup.3 X.sub.3-p (R 3 represents a C 1-20 hydrocarbon moiety; X represents a halogen atom; and p is 0≦p≦2) at an atomic ratio of Al to Ti of titanium trichloride of 0.15 or less; and a chelating agent at a molar ratio of the chelating agent to titanium trichloride of 0.001 or more.
Claim 4
Dependent Claim
41 words
The process for producing the block copolymer according to claim 1 wherein said solid titanium-containing catalytic component is obtained by precipitation at 150° C. or lower from a liquid containing titanium trichloride dissolved in the presence of an ether or thioether.
Claim 5
Dependent Claim
46 words
The process for producing the block copolymer according to claim 1 wherein said solid titanium-containing catalytic component is obtained by reducing titanium tetrachloride with an organoaluminum compound or aluminum metal and treating the resulting solid titanium trichloride by a chelating agent treatment and a halide treatment.
Claim 6
Dependent Claim
41 words
The process for producing the block copolymer according to claim 1 wherein a molar ratio of said aluminum compound added in the second step to said organoaluminum compound used in the first step is in a range of 0.01 to 0.50.
Claim 7
Dependent Claim
31 words
The process for producing the block copolymer according to claim 1 wherein said aluminum compound is added in a form of a complex with an electron donor in the second step.
Claim 8
Dependent Claim
35 words
The process for producing the block copolymer according to claim 1 wherein said aluminum compound is added in a form of a mixture of said aluminum compound and an electron donor in the second step.
References Cited (Backward Citations)
US3732335A
Cited
US4334041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |