US4020264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline polyolefins and production thereof
Assignee: Mitsubishi Chemical Corp
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Filing: 1971-12-20
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Granted: 1977-04-26
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Expires: 1991-12-20
Abstract
Abstract Crystalline polyolefins of high molecular weight and high crystallinity are produced in high yields by polymerizing an olefin in the presence of a catalytic system comprising a combination of an organoaluminum compound and a modified titanium composition which has been prepared by milling together a halogen compound of titanium of a valence lower than the maximum valence (e.g. titanium trichloride) and an alpha , beta -unsaturated carboxylate ester.
Inventors
- 👤 Junichi Hotta
- 👤 Masaki Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:39
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/906
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
61 words
A process for producing crystalline propylene polymers which comprises polymerizing propylene in the presence of a catalytic system comprising, in combination, (1) an organoaluminum compound and (2) a modified titanium composition prepared by mill processing for at least one hour (a) a titanium trichloride and (b) methyl methacrylate, the weight ratio of compound (b) to compound (a) being 0.01 to 0.3:1.
Claim 2
Dependent Claim
61 words
A process for producing crystalline propylene polymers which comprises polymerizing propylene in the presence of a catalytic system comprising, in combination, (1) an organoaluminum compound and (2) a modified titanium composition prepared by mill processing for at least one hour (a) a titanium trichloride and (b) methyl methacrylate, the weight ratio of compound (b) to compound (a) being 0.01 to 0.3:1.
Claim 3
Dependent Claim
77 words
A process for producing crystalline propylene polymers as claimed in claim 1 in which said organoaluminum compound is at least one compound representable by the general formula Al R n X 3 -n , wherein R is a member selected from the group consisting of alkyl and aralkyl groups, X is a member selected from the group consisting of halogens and alkoxy groups, and n is any one of the numerical values 3, 2, 1.5, and 1.
Claim 4
Dependent Claim
36 words
A process for producing crystalline propylene polymers as claimed in claim 1 in which the ratio by weight of the quantities of said compounds (1) and (2) is of the order of from 0.5 to 20:1.
Claim 5
Dependent Claim
26 words
A process for producing crystalline propylene polymers as claimed in claim 1 in which said ratio of compound (b) to compound (a) is 0.03 to 0.2:1.
Claim 6
Dependent Claim
23 words
A process for producing crystalline propylene polymers as claimed in claim 1 in which the polymerization is carried out in a gas phase.
Claim 7
Dependent Claim
38 words
A process for producing crystalline propylene polymers as claimed in claim 1 in which the polymerization is carried out in the presence of at least one inert solvent selected from the group consisting of aliphatic, and aromatic hydrocarbons.
Claim 8
Dependent Claim
27 words
A process for producing crystalline propylene polymers as claimed in claim 1 in which the polymerization is carried out in a medium consisting essentially of liquefied propylene.
Claim 9
Dependent Claim
20 words
A process for producing crystalline propylene polymers as claimed in claim 1 in which said crystalline propylene polymers are homopolypropylenes.
Claim 10
Dependent Claim
78 words
A process for producing crystalline propylene-ethylene copolymers each having ethylene contents less than 10% by weight of the copolymer which comprises copolymerizing propylene and ethylene in the presence of a catalytic system, comprising in combination, (1) an organoaluminum compound and (2) a modified titanium composition prepared by mill processing for a period of at least 1 hour (a) a titanium trichloride and (b), methyl methacrylate, the weight ratio of compound (b) to compound (a) being 0.01 to 0.3:1.
Claim 11
Dependent Claim
78 words
A process for producing crystalline propylene-ethylene copolymers each having ethylene contents less than 10% by weight of the copolymer which comprises copolymerizing propylene and ethylene in the presence of a catalytic system, comprising in combination, (1) an organoaluminum compound and (2) a modified titanium composition prepared by mill processing for a period of at least 1 hour (a) a titanium trichloride and (b), methyl methacrylate, the weight ratio of compound (b) to compound (a) being 0.01 to 0.3:1.
Claim 12
Dependent Claim
75 words
A process for producing crystalline copolymers as claimed in claim 9 in which said organoaluminum compound is at least one compound representable by the general formula AlR n X 3 -n , wherein R is a member selected from the group consisting of alkyl and aralkyl groups, X is a member selected from the group consisting of halogens and alkoxy groups, and n is any one of the numerical values 3, 2, 1.5, and 1.
Claim 13
Dependent Claim
35 words
A process for producing crystalline copolymers as claimed in claim 9 in which the ratio by weight of the quantities of said compounds (1) and (2) is of the order of from 0.5 to 20:1.
Claim 14
Dependent Claim
25 words
A process for producing crystalline copolymers as claimed in claim 9 in which said ratio of compound (b) to compound (a) is 0.03 to 0.2:1.
Claim 15
Dependent Claim
22 words
A process for producing crystalline copolymers as claimed in claim 9 in which the polymerization is carried out in a gas phase.
Claim 16
Dependent Claim
37 words
A process for producing crystalline copolymers as claimed in claim 9 in which the polymerization is carried out in the presence of at least one inert solvent selected from the group consisting of aliphatic, and aromatic hydrocarbons.
Claim 17
Dependent Claim
27 words
A process for producing crystalline propylene polymers as claimed in claim 9 in which the polymerization is carried out in a medium consisting essentially of liquefied propylene.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |