Patent US2461678A successfully refreshed from Google Patents.
US4882380A
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Process for the production of impact polypropylene copolymers
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1987-07-07
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Granted: 1989-11-21
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Expires: 2007-07-07
Abstract
Abstract A process for the production of a product comprising ethylene/propylene copolymer incorporated into a matrix of propylene homopolymer or copolymer comprising the following steps: (a) contacting propylene or propylene and at least one alpha-olefin having 2 to 8 carbon atoms, and hydrogen, wherein the alpha-olefin is present in a ratio of about 0.01 to about 0.06 mole of alpha-olefin per mole of propylene and the hydrogen is present in a ratio of about 0.001 to about 0.45 mole of hydrogen per mole of combined propylene and alpha-olefin, with a catalyst comprising (i) a catalyst precursor, which includes titanium, magnesium, chlorine, and an electron donor; (ii) a hydrocarbylaluminum cocatalyst; and (iii) a selectivity control agent, which is different from the electron donor, in a first reactor in such a manner that a mixture of a homopolymer of propylene or a copolymer of propylene and alpha-olefin together with active catalyst is produced; (b) passing the mixture from step (a) into a second reactor; and (c) adding to the second reactor: (i) a sufficient amount of ethylene and propylene to provide ethylene/propylene copolymer in an amount of about 20 percent to about 45 percent by weight, based on the weight of the product, said ethylene and propylene being introduced in a ratio of about 10 to about 100 moles of ethylene per mole of propylene; and (ii) hydrogen in a mole ratio of about 0.1 to about 1.0 mole of hydrogen per mole of combined ethylene and propylene; and (d) effecting the copolymerization of ethylene and propylene in the second reactor in such a manner that the product is produced.
Inventors
- 👤 Harold K. Ficker
- 👤 William G. Sheard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:17
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/06; C08F297/00; C08F297/06; C08F297/08; C08F297/083; C08F210/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
273 words
A process for the production of a product comprising ethylene/propylene copolymer incorporated into a matrix of propylene homopolymer or copolymer comprising the following steps carried out in the gas phase: (a) contacting propylene or propylene and at least one alpha-olefin having 2 to 8 carbon atoms, and hydrogen, wherein the alpha-olefin is present in a ratio of about 0.01 to about 0.06 mole of alpha-olefin per mole of propylene and the hydrogen is present in a ratio of about 0.001 to about 0.45 mole of hydrogen per mole of combined propylene and alpha-olefin, with a catalyst comprising (i) a catalyst precursor, which includes titanium, magnesium, chlorine, and an electron donor; (ii) a hydrocarbyaluminum cocatalyst; and (iii) a selectivity control agent, which is different from the electron donor, in a first reactor in such a manner that a mixture of a homopolymer of propylene or a copolymer of propylene and alpha-olefin together with active catalyst is produced; (b) passing the mixture from step (a) into a second reactor; and (c) adding to the second reactor: (i) a sufficient amount of ethylene and propylene to provide ethylene/propylene copolymer in an amount of about 20 percent to about 45 percent by weight, based on the weight of the product, said ethylene and propylene being introduced in a ratio of about 10 to about 50 moles of ethylene per mole of propylene; and (ii) hydrogen in a mole ratio of about 0.1 to about 1.0 mole of hydrogen per mole of combined ethylene and propylene; and (d) effecting the copolymerization of ethylene and propylene in the second reactor in such a manner that the product is produced.
Claim 2
Dependent Claim
273 words
A process for the production of a product comprising ethylene/propylene copolymer incorporated into a matrix of propylene homopolymer or copolymer comprising the following steps carried out in the gas phase: (a) contacting propylene or propylene and at least one alpha-olefin having 2 to 8 carbon atoms, and hydrogen, wherein the alpha-olefin is present in a ratio of about 0.01 to about 0.06 mole of alpha-olefin per mole of propylene and the hydrogen is present in a ratio of about 0.001 to about 0.45 mole of hydrogen per mole of combined propylene and alpha-olefin, with a catalyst comprising (i) a catalyst precursor, which includes titanium, magnesium, chlorine, and an electron donor; (ii) a hydrocarbyaluminum cocatalyst; and (iii) a selectivity control agent, which is different from the electron donor, in a first reactor in such a manner that a mixture of a homopolymer of propylene or a copolymer of propylene and alpha-olefin together with active catalyst is produced; (b) passing the mixture from step (a) into a second reactor; and (c) adding to the second reactor: (i) a sufficient amount of ethylene and propylene to provide ethylene/propylene copolymer in an amount of about 20 percent to about 45 percent by weight, based on the weight of the product, said ethylene and propylene being introduced in a ratio of about 10 to about 50 moles of ethylene per mole of propylene; and (ii) hydrogen in a mole ratio of about 0.1 to about 1.0 mole of hydrogen per mole of combined ethylene and propylene; and (d) effecting the copolymerization of ethylene and propylene in the second reactor in such a manner that the product is produced.
Claim 3
Dependent Claim
31 words
The process defined in claim 1 wherein alpha-olefin is present in the first reactor in a ratio of about 0.015 to about 0.04 mole of alpha olefin per mole of propylene.
Claim 4
Dependent Claim
34 words
The process defined in claim 1 wherein the hydrogen is present in the first reactor in a ratio of about 0.004 to about 0.1 mole of hydrogen per mole of combined propylene and alpha-olefin.
Claim 5
Dependent Claim
11 words
The process defined in claim 2 wherein the alpha-olefin is ethylene.
Claim 6
Dependent Claim
36 words
The process defined in claim 1 wherein a sufficient amount of ethylene and propylene is added to the second reactor to provide ethylene/propylene copolymer in an amount of about 25 to about 30 percent by weight.
Claim 7
Dependent Claim
34 words
The process defined in claim 1 wherein the hydrogen is introduced into the second reactor in a mole ratio of about 0.1 to about 0.4 mole of hydrogen per mole of ethylene and propylene.
Claim 8
Dependent Claim
42 words
The process defined in claim 1 wherein the electron donor and the selectivity control agent are selected from the group consisting of ethers, mono- or polycarboxylic acid esters, ketones, phenols, amines, amides, imines, nitriles, silanes, phosphines, phosphates, stilbenes, arsines, phosphoramides, and alcoholates.
Claim 9
Dependent Claim
22 words
The process defined in claim 1 wherein the electron donor is ethyl benzoate and the selectivity control agent is para-ethoxy ethyl benzoate.
Claim 10
Dependent Claim
38 words
The process defined in claim 1 wherein the electron donor is a polycarboxylic acid ester containing two coplanar ester groups attached to adjacent carbon atoms and the selectivity control agent is a silicon compound containing a silicon-oxygen-carbon linkage.
Claim 11
Dependent Claim
55 words
The process defined in claim 9 wherein the atomic ratio of aluminum in the cocatalyst to silicon in the silicon compound is in the range of about 0.5:1 to about 100:1 and the atomic ratio of said aluminum to the titanium in the catalyst precursor is in the range of about 5:1 to about 300:1.
Claim 12
Dependent Claim
10 words
The product produced by the process defined in claim 1.
Claim 13
Dependent Claim
10 words
The product produced by the process defined in claim 9.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |