US4125699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene-propylene rubbery copolymer
Assignee: JSR Corp
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Filing: 1977-05-17
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Granted: 1978-11-14
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Expires: 1997-05-17
Abstract
Abstract A linear ethylene-propylene random rubbery copolymer composed of 78 to 85 mole% of an ethylene unit and 15 to 22 mole% of a propylene unit and having a Mooney viscosity (ML 1+4 , 100° C) of 30 to 50 and a molecular weight distribution corresponding to a Q value of 3.5 to 5.5. The rubbery copolymer may further contain a nonconjugated diene unit in an amount of 4 mole% or less based on the total amount of the ethylene, propylene and nonconjugated diene units. The ethylene-propylene copolymer or ethylene-propylene-nonconjugated diene copolymer affords a cable coating material having improved processability, and when blended with polyethylene or polypropylene, gives a blend having good flowability.
Inventors
- 👤 Akira Yamamoto
- 👤 Masao Shiraishi
- 👤 Masakatu Isozumi
- 👤 Masato Yoshikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:51
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08F210/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A linear ethylene-propylene random rubbery copolymer composed of 78 to 85 mole% of an ethylene unit and 15 to 22 mole% of a propylene unit and having a Mooney viscosity (ML 1+4 , 100° C.) of 30 to 50 and a molecular weight distribution corresponding to a Q value of 3.5 to 5.5.
Claim 2
Dependent Claim
53 words
A linear ethylene-propylene random rubbery copolymer composed of 78 to 85 mole% of an ethylene unit and 15 to 22 mole% of a propylene unit and having a Mooney viscosity (ML 1+4 , 100° C.) of 30 to 50 and a molecular weight distribution corresponding to a Q value of 3.5 to 5.5.
Claim 3
Dependent Claim
34 words
The rubbery copolymer of claim 1 which further includes a nonconjugated diene unit in an amount of 4 mole% or less based on the total amount of the ethylene, propylene and nonconjugated diene units.
Claim 4
Dependent Claim
28 words
The rubbery copolymer of claim 2 wherein the nonconjugated diene is a member selected from the group consisting of 1,4-hexadiene, 1,5-cyclooctadiene, methyltetrahydroindene, ethyltetrahydroindene, dicyclopentadiene, 2-methyl-norbornadiene, 5-methylene-2-norbornene and 5-ethylidene-2-norbornene.
Claim 5
Dependent Claim
20 words
The rubbery copolymer of claim 1 which contains a cyclohexane-insoluble gel in an amount of up to 27% by weight.
Claim 6
Dependent Claim
134 words
In a process which comprises reacting propylene with ethylene in the presence of a reaction solvent and a catalyst composed of an organoaluminum compound and a vanadium compound to produce an ethylene-propylene rubbery copolymer composed of 78 to 85 mole% of an ethylene unit and 15 to 22 mole% of a propylene unit, the improvement wherein the catalyst is composed of an organoaluminum compound and a vanadic acid ester of the general formula VO(OR).sub.n X.sub.3-n wherein R is an alkyl group containing 6 to 12 carbon atoms, n is an integer of 1 to 3, and X is chlorine or bromine, the aluminum/vanadium atomic ratio being 2 to 6, and the amount of the catalyst being 0.6 × 10 -3 to 2.0 × 10 -3 gram-atom, as vanadium, per liter of the reaction solvent.
Claim 7
Dependent Claim
134 words
In a process which comprises reacting propylene with ethylene in the presence of a reaction solvent and a catalyst composed of an organoaluminum compound and a vanadium compound to produce an ethylene-propylene rubbery copolymer composed of 78 to 85 mole% of an ethylene unit and 15 to 22 mole% of a propylene unit, the improvement wherein the catalyst is composed of an organoaluminum compound and a vanadic acid ester of the general formula VO(OR).sub.n X.sub.3-n wherein R is an alkyl group containing 6 to 12 carbon atoms, n is an integer of 1 to 3, and X is chlorine or bromine, the aluminum/vanadium atomic ratio being 2 to 6, and the amount of the catalyst being 0.6 × 10 -3 to 2.0 × 10 -3 gram-atom, as vanadium, per liter of the reaction solvent.
Claim 8
Dependent Claim
75 words
The process of claim 5 wherein the ethylene and propylene are reacted with a nonconjugated diene thereby to form a terpolymer composed of 78 to 85 mole% of an ethylene unit and 15 to 22 mole% of a propylene unit, both being based on the total amount of the ethylene and propylene units, and 4 mole% or less, based on the total amount of the ethylene, propylene and nonconjugated diene units, of a nonconjugated diene.
Claim 9
Dependent Claim
30 words
The process of claim 5 wherein the organoaluminum compound is a member selected from the group consisting of alkylaluminum sesquihalides, dialkylaluminum monohalides, and mixtures of dialkylaluminum monohalides and monoalkylaluminum dihalides.
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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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |