US4039472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing the particle size of as formed polyethylene or ethylene copolymer
Assignee: BP Corp North America Inc
•
Filing: 1975-11-14
•
Granted: 1977-08-02
•
Expires: 1995-11-14
Abstract
Abstract The particle size of as formed polyethylene or ethylene copolymer containing up to about twenty percent of a C 3 to C 8 olefin can be increased by using a high yield, solid catalyst component prepared from (1) a magnesium alkoxide, (2) a titanium (IV) or vanadium (V) chloride, chloroalkoxide or alkoxide, (3) an alkylaluminum compound, and (4) hydrogen chloride. The particle size of as formed polymer can be increased substantially using the hydrogen-chloride-prepared catalyst component, compared to the particle size of polymer made using a similar catalyst component prepared without the use of hydrogen chloride, when either is employed with an alkylaluminum compound promoter in a slurry or vapor phase polymerization process at moderate polymerization temperatures and pressures.
Inventors
- 👤 Glen R. Hoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:52
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
211 words
A catalyst for polymerizing ethylene or ethylene containing a small amount of polymerizable C 3 to C 8 olefin comprising: a. a solid catalyst component made between above about ambient to about 150° C. from (1) a lower alkyl, magnesium dialkoxide, (2) a transition metal compound which is at least one lower alkyl, titanium (IV) or vanadium (V) alkoxide, alkoxychloride or chloride, (3) a lower alkyl, alkylaluminum compound which is a trialkylaluminum, a dialkylaluminum chloride or an alkylaluminum dichloride, and (4) hydrogen chloride, using a mol ratio, said alkylaluminum compound to said transition metal compound, between about two-tenths and ten and a mol ratio, hydrogen chloride to said alkylaluminum compound, of greater than one, said component containing as a percentage of the support weight between one-tenth and 15 weight percent of the transition metal calculated as the metal; and b. a promoter which is a trialkylaluminum, a dialkylaluminum hydride, or a dialkylaluminum chloride wherein said component is made either (i) by reacting said magnesium dialkoxide with said transition metal compound, reacting the product thereof with said alkylaluminum compound and thereafter treating with said hydrogen chloride, or (ii) by together reacting said magnesium dialkoxide, said transition metal compound and said alkylaluminum compound and thereafter treating the product thereof with said hydrogen chloride.
Claim 2
Dependent Claim
211 words
A catalyst for polymerizing ethylene or ethylene containing a small amount of polymerizable C 3 to C 8 olefin comprising: a. a solid catalyst component made between above about ambient to about 150° C. from (1) a lower alkyl, magnesium dialkoxide, (2) a transition metal compound which is at least one lower alkyl, titanium (IV) or vanadium (V) alkoxide, alkoxychloride or chloride, (3) a lower alkyl, alkylaluminum compound which is a trialkylaluminum, a dialkylaluminum chloride or an alkylaluminum dichloride, and (4) hydrogen chloride, using a mol ratio, said alkylaluminum compound to said transition metal compound, between about two-tenths and ten and a mol ratio, hydrogen chloride to said alkylaluminum compound, of greater than one, said component containing as a percentage of the support weight between one-tenth and 15 weight percent of the transition metal calculated as the metal; and b. a promoter which is a trialkylaluminum, a dialkylaluminum hydride, or a dialkylaluminum chloride wherein said component is made either (i) by reacting said magnesium dialkoxide with said transition metal compound, reacting the product thereof with said alkylaluminum compound and thereafter treating with said hydrogen chloride, or (ii) by together reacting said magnesium dialkoxide, said transition metal compound and said alkylaluminum compound and thereafter treating the product thereof with said hydrogen chloride.
Claim 3
Dependent Claim
17 words
The catalyst of claim 1 wherein (a) is effected in the presence of an inert liquid diluent.
Claim 4
Dependent Claim
13 words
The catalyst of claim 1 wherein said promoter is a lower alkyl, trialkylaluminum.
Claim 5
Dependent Claim
13 words
The catalyst of claim 2 wherein said promoter is a lower alkyl, trialkylaluminum.
Claim 6
Dependent Claim
13 words
The catalyst of claim 3 wherein said alkylaluminum compound is an alkylaluminum dichloride.
Claim 7
Dependent Claim
13 words
The catalyst of claim 4 wherein said alkylaluminum compound is an alkylaluminum dichloride.
Claim 8
Dependent Claim
19 words
The catalyst of claim 5 wherein said transition metal compound is at least a lower alkyl, titanium (IV) alkoxide.
Claim 9
Dependent Claim
19 words
The catalyst of claim 6 wherein said transition metal compound is at least a lower alkyl, titanium (IV) alkoxide.
Claim 10
Dependent Claim
12 words
The catalyst of claim 7 wherein said magnesium dialkoxide is magnesium diethoxide.
Claim 11
Dependent Claim
12 words
The catalyst of claim 8 wherein said magnesium dialkoxide is magnesium diethoxide.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |