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US4663299A
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Preparation of spherical magnesium alkoxide particles
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1986-07-14
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Granted: 1987-05-05
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Expires: 2006-07-14
Abstract
Abstract A process for preparing spherical particles of a compound with the general formula Mg(OR) 2-a (OR') a is disclosed. In the process R is an alkyl group with from 2 to 8 carbon atoms, R' is an alkyl group with from 1 to 7 carbon atoms and a is a number of from 0 to 0.5. The process comprises preparing a homogeneous solution of a compound Mg(OR) 2 in an aliphatic alcohol with the general formula R'OH, spray-drying the solution at a temperature of from 15° to 85° C., suspending the spray-dried solid particles in an aliphatic alcohol with the formula ROH in which R is the same alkyl group as present in the said compound Mg(OR) 2 , heating the suspension in order to remove an alcohol with the formula R'OH from the liquid phase by distillation and separating the solid particles from the liquid phase.
Inventors
- 👤 John C. Chadwick
- 👤 Jacob C. v. d. Sar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:40
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
A process for preparing spherical particles of a compound with the general formula Mg(OR) 2-a (OR') a in which R is an alkyl group with from 2 to 8 carbon atoms, R' is an alkyl group with from 1 to 7 carbon atoms and a is a number of from 0 to 0.5, which process comprises: (a) preparing a homogeneous solution of a compound Mg(OR) 2 in an aliphatic alcohol with the general formula R'OH, (b) spray-drying the resulting solution at a temperature of from 15° to 85° C. therein forming solid particles, (c) suspending the spray-dried solid particles in an aliphatic alcohol with the formula ROH in which R is the same alkyl group as present in the said compound Mg(OR) 2 , (d) heating the resulting suspension in order to remove an alcohol with the formula R'OH from the liquid phase by distillation, and (e) separating the solid particles from the liquid phase.
Claim 2
Dependent Claim
155 words
A process for preparing spherical particles of a compound with the general formula Mg(OR) 2-a (OR') a in which R is an alkyl group with from 2 to 8 carbon atoms, R' is an alkyl group with from 1 to 7 carbon atoms and a is a number of from 0 to 0.5, which process comprises: (a) preparing a homogeneous solution of a compound Mg(OR) 2 in an aliphatic alcohol with the general formula R'OH, (b) spray-drying the resulting solution at a temperature of from 15° to 85° C. therein forming solid particles, (c) suspending the spray-dried solid particles in an aliphatic alcohol with the formula ROH in which R is the same alkyl group as present in the said compound Mg(OR) 2 , (d) heating the resulting suspension in order to remove an alcohol with the formula R'OH from the liquid phase by distillation, and (e) separating the solid particles from the liquid phase.
Claim 3
Dependent Claim
18 words
The process of claim 1, in which the alkyl R is ethyl and the alkyl R' is methyl.
Claim 4
Dependent Claim
21 words
The process of claim 1 in which the spray-drying is carried out at a temperature of from 30° to 70° C.
Claim 5
Dependent Claim
84 words
A process for preparing an olefin polymerization catalyst component which comprises halogenating the spherical particles produced with the process of claim 1 with a halide of tetravalent titanium in the presence of a halohydrocarbon and an electron donor, the halogenation optionally being preceded by converting the spherical Mg-alkoxide particles into a compound with the formula Mg(OR) 2-b X b , in which b is a number of from 0.3 to 1.8 and X is halogen, by reacting with a halogenating agent other than titaniumhalide.
Claim 6
Dependent Claim
18 words
The process of claim 4, in which the electron donor is an alkylester of an aromatic carboxylic acid.
Claim 7
Dependent Claim
37 words
The process of claim 4 in which the catalyst component is subjected to a subsequent reaction with titanium tetrachloride at a temperature of from 60° to 136° C., optionally in the presence of an organic acid halide.
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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |