US4739015A
Expired / Lapsed
US
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Process for producing propylene block copolymer
Assignee: Mitsui Chemicals Inc
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Filing: 1985-09-12
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Granted: 1988-04-19
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Expires: 2005-09-12
Abstract
Abstract A process for producing a propylene block copolymer in the presence of a highly stereospecific olefin polymerization catalyst which comprises producing a crystalline polymer or copolymer of propylene in a first stage and random-copolymerizing propylene and another alpha-olefin in a mole ratio of from 10:90 to 90:10 in the presence of the propylene polymer or copolymer in a second stage; wherein in the random copolymerization, 0.0001 to 0.5 mole, per gram atom of aluminum in the catalyst, of an oxygen-containing compound being gaseous in a standard condition or 0.001 to 1 mole, per gram atom of aluminum in the catalyst, of an active hydrogen-containing compound being liquid or solid in a standard condition is fed into the random-copolymerization reaction system.
Inventors
- 👤 Akinori Toyota
- 👤 Norio Kashiwa
- 👤 Haruyuki Koda
- 👤 Matsunao Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:56
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A process for producing a propylene block copolymer in the presence of a highly stereospecific olefin polymerization catalyst wherein the olefin polymerization catalyst is a catalyst comprising a halogen-containing titanium catalyst component and an organoaluminum compound catalyst component, which comprises producing crystalline polymer or copolymer of propylene in a first stage and random-copolymerizing propylene and another alpha-olefin in a mole ratio of from 10:90 to 90:10 in the presence of the propylene polymer or copolymer in a second stage; wherein in the random copolymerization, 0.0001 to 0.5 mole, per gram atom of aluminum in the catalyst, of an oxygen-containing compound being gaseous in a standard condition is fed into a random-copolymerization reaction system.
Claim 2
Dependent Claim
113 words
A process for producing a propylene block copolymer in the presence of a highly stereospecific olefin polymerization catalyst wherein the olefin polymerization catalyst is a catalyst comprising a halogen-containing titanium catalyst component and an organoaluminum compound catalyst component, which comprises producing crystalline polymer or copolymer of propylene in a first stage and random-copolymerizing propylene and another alpha-olefin in a mole ratio of from 10:90 to 90:10 in the presence of the propylene polymer or copolymer in a second stage; wherein in the random copolymerization, 0.0001 to 0.5 mole, per gram atom of aluminum in the catalyst, of an oxygen-containing compound being gaseous in a standard condition is fed into a random-copolymerization reaction system.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the oxygen-containing compound is selected from the group consisting of oxygen, carbon monoxide, carbon dioxide, nitrogen monoxide, sulfur dioxide and carbonyl sulfide.
Claim 4
Dependent Claim
63 words
The process of claim 1 wherein the first stage is carried out at a temperature of about 40° to about 150° C. and a pressure of about 1 to about 200 kg/cm 2 -G, and the second stage is carried out at a temperature of about 40° to about 160° C. and a pressure of about 1 to about 200 kg/cm 2 -G.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the other alpha-olefin is selected from the group consisting of ethylene and alpha-olefins having 4 to 10 carbon atoms.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the mole ratio of propylene to the other alpha-olefin is from 20:80 to 80:20.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein the oxygen-containing compound is selected from the group consisting of oxygen, carbon monoxide, carbon dioxide and carbonyl sulfide.
Claim 8
Dependent Claim
37 words
The process of claim 1 wherein from 0.001 to 0.2 mole, per gram atom of aluminum in the catalyst, of the oxygen-containing compound which is gaseous in the standard condition is fed into the random-copolymerization reaction system.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the oxygen-containing compound is oxygen.
Claim 10
Dependent Claim
32 words
The process of claim 1 wherein the oxygen-containing compound is added to the crystalline propylene polymer or copolymer containing the polymerization catalyst from the first stage prior to initiation of the random-copolymerization.
Claim 11
Dependent Claim
37 words
The process of claim 1 which is a continuous polymerization process wherein the random-copolymerization in the second stage is carried out in the vapor phase and the oxygen-containing compound is continuously fed into the random-copolymerization reaction system.
Claim 12
Dependent Claim
35 words
The process of claim 1 wherein the other alpha-olefin is ethylene or an alpha-olefin having 4 to 10 carbon atoms and the mole ratio of propylene to the other alpha-olefin is from 20:80 to 80:20.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |