Patent US4617366A successfully refreshed from Google Patents.
US4617366A
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Process for manufacturing ethylene terpolymers and ethylene copolymers
Assignee: Orkem SA
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Filing: 1985-08-22
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Granted: 1986-10-14
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Expires: 2005-08-22
Abstract
Abstract A process for the manufacture of radical ethylene terpolymers or copolymers comprising moieties derived from an alkyl (meth)acrylate and/or moieties derived from maleic anhydride by copolymerizing, in the presence of at least one free-radical initiator, a mixture of ethylene, (meth)acrylate and/or maleic anhydride in a device incorporating a primary compressor, the delivery pressure of which is between 200 and 300 bars, connected to a secondary compressor which is connected directly to a polymerization reactor, fresh ethylene being fed at the intake of the said primary compressor and said copolymerization being carried out in the said polymerization reactor under a pressure of between 1,000 and 2,500 bars and a temperature of between 140° and 280° C., wherein at least one the alkyl (meth)acrylate and/or maleic anhydride is fed directly into the said polymerization reactor. The process of the invention has the advantage of not requiring a homogenization device before the entry of the monomers into the reactor.
Inventors
- 👤 Pierre Gloriod
- 👤 Joel Audureau
- 👤 Maurice Pellegrini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:11
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/02; Y; Y02; Y02P; Y02P30/00; Y02P30/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
157 words
A process for the manufacture of radical ethylene terpolymers comprising 50 to 99.2% by weight of moieties derived from ethylene, 0.5 to 40% by weight of moieties derived from an alkyl (meth)acrylate and 0.3 to 10% by weight of moieties derived from maleic anhydride by copolymerizing, in the presence of at least one free-radical initiator, a mixture of ethylene, an alkyl (meth)acrylate and maleic anhydride, in a device comprising a primary compressor, the delivery pressure of which is between 200 and 300 bars, connected to a secondary compressor which is connected directly to a polymerization reactor, fresh ethylene being fed at the intake of the said primary compressor and said copolymerization being carried out in the said polymerization reactor under a pressure of between 1,000 and 2,500 bars and at a temperature of between 140° and 280° C., wherein at least one of the alkyl (meth)acrylate and maleic anhydride is fed directly into the said polymerization reactor.
Claim 2
Dependent Claim
157 words
A process for the manufacture of radical ethylene terpolymers comprising 50 to 99.2% by weight of moieties derived from ethylene, 0.5 to 40% by weight of moieties derived from an alkyl (meth)acrylate and 0.3 to 10% by weight of moieties derived from maleic anhydride by copolymerizing, in the presence of at least one free-radical initiator, a mixture of ethylene, an alkyl (meth)acrylate and maleic anhydride, in a device comprising a primary compressor, the delivery pressure of which is between 200 and 300 bars, connected to a secondary compressor which is connected directly to a polymerization reactor, fresh ethylene being fed at the intake of the said primary compressor and said copolymerization being carried out in the said polymerization reactor under a pressure of between 1,000 and 2,500 bars and at a temperature of between 140° and 280° C., wherein at least one of the alkyl (meth)acrylate and maleic anhydride is fed directly into the said polymerization reactor.
Claim 3
Dependent Claim
24 words
A process according to claim 1, wherein the alkyl (meth)acrylate and maleic anhydride are introduced directly into the said reactor at the same time.
Claim 4
Dependent Claim
30 words
A process according to claim 2, wherein the alkyl (meth)acrylate and maleic anhydride are introduced in the form of a solution of maleic anhydride and alkyl (meth)acrylate in a solvent.
Claim 5
Dependent Claim
24 words
A process according to one of claims 2 and 3, wherein additional alkyl (meth)acrylate is fed at the intake of the said secondary compressor.
Claim 6
Dependent Claim
24 words
A process according to one of claims 2 and 3, wherein additional maleic anhydride is fed at the intake of the said secondary compressor.
Claim 7
Dependent Claim
30 words
A process according to claim 1, wherein maleic anhydride is fed directly into the said reactor and the alkyl (meth)acrylate is fed at the intake of the said secondary compressor.
Claim 8
Dependent Claim
30 words
A process according to claim 1, wherein the alkyl (meth)acrylate is fed directly into the said reactor and maleic anhydride is fed at the intake of the said secondary compressor.
Claim 9
Dependent Claim
120 words
A process for the manufacture of radical ethylene copolymers comprising moieties derived from a comonomer selected from an alkyl (meth)acrylate and maleic anhydride, by copolymerizing, in the presence of at least one free-radical initiator, a mixture of ethylene and comonomer in a device comprising a primary compressor, the delivery pressure of which is between 200 and 300 bars, connected to a secondary compressor, which is connected directly to a polymerization reactor, fresh ethylene being fed at the intake of the said primary compressor and said copolymerization being carried out in the said polymerization reactor under a pressure between 1,000 and 2,500 bars and a temperature between 140° and 280° C., wherein the comonomer is fed directly into the said reactor.
Claim 10
Dependent Claim
120 words
A process for the manufacture of radical ethylene copolymers comprising moieties derived from a comonomer selected from an alkyl (meth)acrylate and maleic anhydride, by copolymerizing, in the presence of at least one free-radical initiator, a mixture of ethylene and comonomer in a device comprising a primary compressor, the delivery pressure of which is between 200 and 300 bars, connected to a secondary compressor, which is connected directly to a polymerization reactor, fresh ethylene being fed at the intake of the said primary compressor and said copolymerization being carried out in the said polymerization reactor under a pressure between 1,000 and 2,500 bars and a temperature between 140° and 280° C., wherein the comonomer is fed directly into the said reactor.
Claim 11
Dependent Claim
37 words
A process according to claim 8, wherein the comonomer is an alkyl (meth) acrylate the concentration of which in the copolymer is between 0.5 and 40% by weight, the ethylene concentration being 60 to 99.5% by weight.
Claim 12
Dependent Claim
37 words
A process according to claim 8, wherein the said comonomer is maleic anhydride, the concentration of which in the copolymer is between 0.3 and 10% by weight, the concentration of ethylene being 90 to 99.7% by weight.
References Cited (Backward Citations)
US3926925A
Cited
GB2091745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |