US4000357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene with oxygen and organic initiators
Assignee: Union Carbide Corp
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Filing: 1974-08-29
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Granted: 1976-12-28
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Expires: 1994-08-29
Abstract
Abstract Ethylene is polymerized alone, or with other comonomers, under high pressure with oxygen and two or more organic initiators in a tubular reactor for the purposes of increasing the conversion of monomer to polymer and to produce polymer which has a low hexane extractables content, and which has, in the form of film, improved optical properties.
Inventors
- 👤 John P. Marano, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:06
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
186 words
In a process for producing film grade polymer of ethylene having improved optical properties and a low hexane extractables fraction in a tubular reactor under high pressure conditions in the presence of chain transfer agent and a plurality of free radical initiators, the improvement which comprises conducting said process in a reactor having a length to diameter ratio of >1000, and wherein the length of the tubular reactor, in feet, between the point in the tubular reactor at which the initiation temperature of a first organic free radical initiator is reached and the point in the tubular reactor at which the peak temperature of a second organic free radical initiator is reached is ##EQU3## wherein W = the monomer pumping rate, in pounds per hour, and D = the inner diameter of the reactor tube, in inches, and in the presence of, as said initiators, molecular oxygen, at least one said first organic free radical initiator having a 10 hour half life temperature of <123° C. and at least one said second organic free radical initiator having a 10 hour half life temperature of >133° C.
Claim 2
Dependent Claim
186 words
In a process for producing film grade polymer of ethylene having improved optical properties and a low hexane extractables fraction in a tubular reactor under high pressure conditions in the presence of chain transfer agent and a plurality of free radical initiators, the improvement which comprises conducting said process in a reactor having a length to diameter ratio of >1000, and wherein the length of the tubular reactor, in feet, between the point in the tubular reactor at which the initiation temperature of a first organic free radical initiator is reached and the point in the tubular reactor at which the peak temperature of a second organic free radical initiator is reached is ##EQU3## wherein W = the monomer pumping rate, in pounds per hour, and D = the inner diameter of the reactor tube, in inches, and in the presence of, as said initiators, molecular oxygen, at least one said first organic free radical initiator having a 10 hour half life temperature of <123° C. and at least one said second organic free radical initiator having a 10 hour half life temperature of >133° C.
Claim 3
Dependent Claim
10 words
A process as in claim 1 for producing ethylene homopolymer.
Claim 4
Dependent Claim
37 words
A process as in claim 2 in which said first organic initiator has a 10 hour half life temperature of <79° C. and said second organic initiator has a ten hour half life temperature of >160° C.
Claim 5
Dependent Claim
15 words
A process as in claim 3 in which said first organic initiator comprises tertiary-butyl-peroxy-2-ethyl hexanoate.
Claim 6
Dependent Claim
15 words
A process as in claim 4 in which said second organic initiator comprises tertiary-butyl hydroperoxide.
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |