US3714135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of homopolymers or copolymers of ethylene
Assignee: BASF SE
•
Filing: 1970-09-16
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Granted: 1973-01-30
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Expires: 1990-09-16
Abstract
Abstract Production of homopolymers or copolymers of ethylene by homopolymerization of ethylene or copolymerization of mixtures of ethylene and other monomers at superatmospheric pressure and elevated temperature under the influence of a free radical generating polymerization initiator with or without a polymerization regulator. The initiator used is a mixture of (a) an initiator having a halflife of ten to 30 hours at 50* C and (b) an initiator having a halflife of 0.2 to 10 hours at 50*C, the halflife at 50*C of initiator (a) being at least twice as long as that of initiator (b). Polymers having a high molecular weight and a low degree of branching are obtained in a fairly high yield.
Inventors
- 👤 H Pfannmueller
- 👤 F Urban
- 👤 H Gropper
- 👤 V Gierth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:48
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
223 words
A process for the production of a homopolymer or copolymer of ethylene by homopolymerization of ethylene or by copolymerization of a mixture of 100 molar proportions of ethylene and up to 100 molar proportions of at least one other ethylenically unsaturated monomer which has from three to twenty carbon atoms and which is copolymerizable with ethylene at a pressure of from 800 to 7,000 atmospheres and a temperature of from 150* to 260* C under the influence of a free radical generating polymerization initiator and with or without a polymerization regulator, wherein there is used as the polymerization initiator in an amount of from 2 to 1, 000 ppm molar (with reference to the whole amount of monomers used) a mixture of a. a free radical generating polymerization initiator which has a halflife of from 10 to 30 hours at 50* C and b. a free radical generating polymerization initiator which has a halflife of from 12 minutes to 10 hours at 50* C, with the provisos that I. the halflife of the polymerization initiator (a) at 50* C is at least twice that of the polymerization initiator (b) and II. the amount of (a) or (b) in the mixture of polymerization initiators is not less than 10 percent molar in either case (with reference to the total molecular amount of the mixture).
Claim 2
Dependent Claim
223 words
A process for the production of a homopolymer or copolymer of ethylene by homopolymerization of ethylene or by copolymerization of a mixture of 100 molar proportions of ethylene and up to 100 molar proportions of at least one other ethylenically unsaturated monomer which has from three to twenty carbon atoms and which is copolymerizable with ethylene at a pressure of from 800 to 7,000 atmospheres and a temperature of from 150* to 260* C under the influence of a free radical generating polymerization initiator and with or without a polymerization regulator, wherein there is used as the polymerization initiator in an amount of from 2 to 1, 000 ppm molar (with reference to the whole amount of monomers used) a mixture of a. a free radical generating polymerization initiator which has a halflife of from 10 to 30 hours at 50* C and b. a free radical generating polymerization initiator which has a halflife of from 12 minutes to 10 hours at 50* C, with the provisos that I. the halflife of the polymerization initiator (a) at 50* C is at least twice that of the polymerization initiator (b) and II. the amount of (a) or (b) in the mixture of polymerization initiators is not less than 10 percent molar in either case (with reference to the total molecular amount of the mixture).
Claim 3
Dependent Claim
15 words
A process as claimed in claim 1 carried out at from 165* to 235* C.
Claim 4
Dependent Claim
28 words
A process as claimed in claim 1 wherein the amount of initiator used is from 3 to 200 ppm molar based on the total amount of monomers used.
Claim 5
Dependent Claim
38 words
A process as claimed in claim 1 wherein the amount of each of the polymerization initiators in the mixture of (a) and (b) is at least 25 percent molar based on the total molecular amount of the mixture.
Claim 6
Dependent Claim
17 words
A process as claimed in claim 1 wherein initiator (a) is bis-2,4-dichlorobenzoyl peroxide, tert-butyl perpivalate or 2,2''-azobis-(2,4-dimethylvaleronitrile).
Claim 7
Dependent Claim
18 words
A process as claimed in claim 1 wherein initiator (b) is acetylcyclohexanesulfonyl peroxide, bis-(4-tert-butylcyclohexyl) peroxydicarbonate or diisopropyl aeroxydicarbonate.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |