US4199474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for polymerizing olefins
Assignee: BP Chimie SA
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Filing: 1978-02-09
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Granted: 1980-04-22
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Expires: 1998-02-09
Abstract
Abstract A process for producing titanium-trichloride based catalyst comprising reducing titanium tetrachloride in excess with an organo-aluminum compound in the presence of 2 to 5 mols per mol of organo-aluminum of one or more aliphatic ethers having the formula R'--O--R" in which R' and R" are alkyl groups containing 1 to 5 carbon atoms and maturing the formed precipitate at a temperature within the range of 80°-115° C., said catalyst being useful with an organo-metallic co-catalyst in the polymerization of olefins.
Inventors
- 👤 Stylianos Sandis
- 👤 Jean C. Bailly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:46
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
247 words
In a process for the production of solid catalyst based on titanium trichloride used in the polymerization of alpha-olefins, wherein titanium tetrachloride is reduced by an organoaluminum compound to form a precipitate and then the precipitate is matured in the presence of its formation media, the improvement comprising reducing the titanium tetrachloride with the organo-aluminum compound such that: the ratio between the number of mols of titanium tetrachloride and the number of organic gram equivalents of the organo-aluminum compound is from 1.2 to 1.8; the organo-aluminum compound comprises a compound having the formula AlR n X 3-n , in which R is an alkyl, cycloalkyl, aryl or aralkyl group containing from 1 to 12 carbon atoms, X is a hydrogen atom or a halogen atom, and n is an integer or a fraction capable of being of any value of from 1 to 3; the process is performed in the presence of from 2 to 5 mols of organo-aluminum compound, of one or more aliphatic ethers having the formula R'--O--R" in which R' and R" are alkyl group containing from 1 to 5 carbon atoms in which the organo-aluminum compound is admixed with at least a part of the ether prior to admixture with the titanium tetrachloride; the reduction of the titanium tetrachloride is performed at -10° to 80° C.; maturing of the precipitate is performed at from 80° to 115° C. for a period of from 15 minutes to 24 hours and recovering the solid catalyst.
Claim 2
Dependent Claim
247 words
In a process for the production of solid catalyst based on titanium trichloride used in the polymerization of alpha-olefins, wherein titanium tetrachloride is reduced by an organoaluminum compound to form a precipitate and then the precipitate is matured in the presence of its formation media, the improvement comprising reducing the titanium tetrachloride with the organo-aluminum compound such that: the ratio between the number of mols of titanium tetrachloride and the number of organic gram equivalents of the organo-aluminum compound is from 1.2 to 1.8; the organo-aluminum compound comprises a compound having the formula AlR n X 3-n , in which R is an alkyl, cycloalkyl, aryl or aralkyl group containing from 1 to 12 carbon atoms, X is a hydrogen atom or a halogen atom, and n is an integer or a fraction capable of being of any value of from 1 to 3; the process is performed in the presence of from 2 to 5 mols of organo-aluminum compound, of one or more aliphatic ethers having the formula R'--O--R" in which R' and R" are alkyl group containing from 1 to 5 carbon atoms in which the organo-aluminum compound is admixed with at least a part of the ether prior to admixture with the titanium tetrachloride; the reduction of the titanium tetrachloride is performed at -10° to 80° C.; maturing of the precipitate is performed at from 80° to 115° C. for a period of from 15 minutes to 24 hours and recovering the solid catalyst.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1, which is performed in a liquid saturated aliphatic hydrocarbon.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1 which includes the step of carrying out the process with agitation.
Claim 5
Dependent Claim
42 words
A process as claimed in claim 1 which comprises effecting reduction of the titanium tetrachloride by mixing the reagents at a temperature of from -40° to -10° C., then heating the resulting mixture at a temperature of from -10° to 80° C.
Claim 6
Dependent Claim
64 words
A process as claimed in any one of claims 1 to 4, which comprises first preparing, at a temperature of from -40° to 50° C., a mixture of ether and organo-aluminum compound, such that the ratio between the number of mols of ether and the number of mols of organo-aluminum compound is from 0.30 to 5, then introducing such mixture into the titanium tetrachloride.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 which includes the step of washing the catalyst after maturing, by means of an inert solvent.
Claim 8
Dependent Claim
135 words
A catalyst system comprising the catalysts prepared in accordance with claim 1 in association with co-catalysts comprising organo-metallic compounds of the metals of groups II and III of the periodic table of elements, such that organo-aluminum compounds having the mean formula AlR m IV X 3-m , in which R IV represents an alkyl radical having from 1 to 12 carbon atoms, X represents a hydrogen atom or a halogen atom, and m represents an integer or a fraction which can be of any value of from 1 to 3, for polymerization or co-polymerization, under a pressure lower than 40 bars and at a temperature of from 40° to 150° C., of olefins having the formula CH 2 =CHR"' in which R"' represents hydrogen or an alkyl radical having from 1 to 8 carbon atoms.
Claim 9
Dependent Claim
11 words
The catalysts prepared in accordance with the process of claim 1.
Claim 10
Dependent Claim
35 words
A process as claimed in claim 1 in which the ratio between the number of mols of titanium tetrachloride and the number of gram equivalents of the organo-aluminum compound is within the range of 1.3-1.6.
Claim 11
Dependent Claim
19 words
A process as claimed in claim 1 in which the halogen atom is an atom of chlorine or bromine.
Claim 12
Dependent Claim
18 words
A process as claimed in claim 1 in which n is a number or fraction of from 1.5-3.
Claim 13
Dependent Claim
27 words
A process as claimed in claim 1 in which the reduction of the titanium tetrachloride is carried out at a temperature within the range of 10-60° C.
Claim 14
Dependent Claim
22 words
A process as claimed in claim 1 in which the precipitate is matured at a temperature within the range of 90°-110° C.
Claim 15
Dependent Claim
22 words
A process as claimed in claim 1 in which the precipitate is matured for a period of time of from 1-4 hours.
Claim 16
Dependent Claim
22 words
A process as claimed in claim 5 in which the mixture is prepared at a temperature within the range of 0°-30° C.
Claim 17
Dependent Claim
17 words
A process as claimed in claim 5 in which the mixture is prepared in an inert solvent.
Claim 18
Dependent Claim
30 words
A process as claimed in claim 5 in which the titanium tetrachloride into which the mixture is introduced in diluted with a liquid saturated hydrocarbon or ether or mixtures thereof.
Claim 19
Dependent Claim
16 words
A process as claimed in claim 6 in which the inert solvent is a saturated hydrocarbon.
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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) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |