Patent US4450098A successfully refreshed from Google Patents.
US4450098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a polymerization catalyst and preparation of ethylene polymers with this catalyst
Assignee: Stamicarbon BV
•
Filing: 1982-08-05
•
Granted: 1984-05-22
•
Expires: 2002-08-05
Abstract
Abstract Process for preparing and treating a chromium-containing catalyst so that when the catalyst is activated the risk of explosion is substantially reduced. The catalyst comprises a complex of chromium and optionally other transition metal complexes reacted with one or more organometallic compounds of a metal of group II or III of the periodic table, which metal contains hydrocarbyl groups of 1-20 carbon atoms. The reaction product is applied to an inert inorganic support to form the catalyst component which is deactivated by treatment with oxygen or an alcohol to modify or replace residual hydrocarbyl groups. The catalyst component may be activated to form the catalyst by heating in the range 200°-1200° C. The catalyst is used to catalyze a polymerization of alpha-olefins.
Inventors
- 👤 Lambertus J. M. A. VAN DE Leemput
- 👤 Godefridus A. H. Nooijen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:13
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A process for preparing a chromium-containing catalyst component which, upon activation with heat at a temperature of from 200° to 1200° C. will effect the polymerization of alpha-olefins, which process comprises: a. applying to an inert inorganic support the reaction product of (1) a chromium compound, with (2) one or more group II or III metal hydrocarbyl compounds, wherein the hydrocarbyl groups contain 1-20 carbon atoms; and b. thereafter treating the product of step (a) with an atmosphere containing molecular oxygen at a temperature less than 100° C., or an organic compound containing one or more hydroxygroups reactive with the hydrocarbyl groups of said product to decompose the reactive hydrocarbylgroups thereon.
Claim 2
Dependent Claim
111 words
A process for preparing a chromium-containing catalyst component which, upon activation with heat at a temperature of from 200° to 1200° C. will effect the polymerization of alpha-olefins, which process comprises: a. applying to an inert inorganic support the reaction product of (1) a chromium compound, with (2) one or more group II or III metal hydrocarbyl compounds, wherein the hydrocarbyl groups contain 1-20 carbon atoms; and b. thereafter treating the product of step (a) with an atmosphere containing molecular oxygen at a temperature less than 100° C., or an organic compound containing one or more hydroxygroups reactive with the hydrocarbyl groups of said product to decompose the reactive hydrocarbylgroups thereon.
Claim 3
Dependent Claim
14 words
Process of claim 1 wherein the oxygen is derived from a stream of air.
Claim 4
Dependent Claim
15 words
Process of claim 1 wherein said organic compound containing an oxygen atom is an alcohol.
Claim 5
Dependent Claim
11 words
Process of claim 3 wherein the alcohol contains 1-3 carbon atoms.
Claim 6
Dependent Claim
9 words
Process of claim 4 wherein the alcohol is methanol.
Claim 7
Dependent Claim
31 words
Process for preparing a supported chromium-containing catalyst for the polymerization of alpha-olefins wherein the catalyst component of claim 1 is heated at a temperature from 200°-1200° C. in a non-reducing atmosphere.
Claim 8
Dependent Claim
10 words
The catalyst component formed by the process of claim 1.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |