US4035560A
Expired / Lapsed
US
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Method of polymerizing olefins in a fluidized bed
Assignee: Naphtachimie SA
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Filing: 1976-05-24
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Granted: 1977-07-12
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Expires: 1996-05-24
Abstract
Abstract The polymerization of olefins to form polymers having a molecular weight greater than 50,000 wherein the polymerization is carried out in the presence of a catalyst component formed of a compound of a transition metal of the sub-groups IVa, Va and VIa, and a co-catalyst component of at least one organo-metallic compound of a metal from groups II and III of the periodic table, in which the co-catalyst is in the form of a liquid which is separately introduced into the reaction vessel on a carrier formed of an inert porous powder which is impregnated with the co-catalyst.
Inventors
- 👤 Francois Caumartin
- 👤 Laszlo Havas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:34
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/904; Y10S526/905; Y10S526/907
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
A method of producing polymers having a molecular weight generally greater than 50,000 by polymerization of olefins having the formula CH 2 = CHR, in which R is a hydrogen atom or an alkyl radical having from 1 to 8 carbon atoms, in which polymerization the polymer in the course of formation is maintained in a fluidized state by an upward stream of a gaseous mixture containing the olefin or olefins to be polymerized in the presence of a catalytic system formed of a catalyst component in the form of a solid comprising at least one compound of a transition metal from the sub-groups IVa, Va and VIa of the periodic table, and a co-catalyst component formed of at least one organo-metallic compound of a metal of groups II and III of the periodic table, said latter compound being liquid under polymerization conditions and of low volatility, the improvement comprising introducing to co-catalyst component separate and apart from the catalyst component into the polymerization reaction vessel on a carrier formed of an inert porous powder impregnated with co-catalyst.
Claim 2
Independent Claim
178 words
A method of producing polymers having a molecular weight generally greater than 50,000 by polymerization of olefins having the formula CH 2 = CHR, in which R is a hydrogen atom or an alkyl radical having from 1 to 8 carbon atoms, in which polymerization the polymer in the course of formation is maintained in a fluidized state by an upward stream of a gaseous mixture containing the olefin or olefins to be polymerized in the presence of a catalytic system formed of a catalyst component in the form of a solid comprising at least one compound of a transition metal from the sub-groups IVa, Va and VIa of the periodic table, and a co-catalyst component formed of at least one organo-metallic compound of a metal of groups II and III of the periodic table, said latter compound being liquid under polymerization conditions and of low volatility, the improvement comprising introducing to co-catalyst component separate and apart from the catalyst component into the polymerization reaction vessel on a carrier formed of an inert porous powder impregnated with co-catalyst.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1 in which the co-catalyst has a vapor tension below 1 mm of mercury at 80° C.
Claim 4
Dependent Claim
63 words
A method as claimed in claim 1 in which the co-catalyst is formed of one or more liquid organo-aluminum compounds of the general formula AlR' x Y 3 -x , in which R' represents an alkyl group having 4 to 20 carbon atoms, Y an atom of hydrogen or of a halogen, and x is a whole number of from 1 to 3.
Claim 5
Dependent Claim
13 words
A method as claimed in claim 3 in which the halogen is chlorine.
Claim 6
Dependent Claim
40 words
A method as claimed in claim 3 in which the co-catalyst is employed in an amount such that the atomic ratio of aluminum of the co-catalyst to transition metal of the catalyst is within the range of 0.1 to 50.
Claim 7
Dependent Claim
51 words
A method as claimed in claim 1, in which the porous powder carrying the co-catalyst is in the form of the solid particles, the mean diameter of which is between 10 microns and 1 mm, and the porosity of which is such that the proportion of voids is at least 10%.
Claim 8
Dependent Claim
44 words
A method as claimed in claim 1, in which the porous powder carrying the co-catalyst is in the form of a solid inorganic substance selected from the group consisting of dehydrated alumina, silica, an aluminum silicate, a magnesium silicate, calcium carbonate and magnesium carbonate.
Claim 9
Dependent Claim
23 words
A method of claimed in claim 1, in which the porous powder carrying the co-catalyst is in the form of a polymer powder.
Claim 10
Dependent Claim
14 words
A method as claimed in claim 8 in which the polymer is a polyolefin.
Claim 11
Dependent Claim
16 words
A method as claimed in claim 1, in which the catalyst is a compound of titanium.
Claim 12
Dependent Claim
51 words
A method as claimed in claim 1, in which the polymerized olefin is mainly ethylene, polymerization being carried out by starting with a gaseous mixture which may contain up to 90% by volume of hydrogen, the pressure being between 1 and 40 bars and the temperature between 30° and 115° C.
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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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |