US4496661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency catalyst for polymerizing olefins
Assignee: Dow Chemical Co
•
Filing: 1983-10-24
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Granted: 1985-01-29
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Expires: 2003-10-24
Abstract
Abstract Compositions exhibiting high catalytic activity in the polymerization of α-olefins are prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and/or a titanium tetrahalide such as titanium tetrachloride and a titaniumoxydihalide such as titaniumoxydichloride, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts provide higher efficiencies and a broader molecular weight distribution than those catalysts employing either of the titanium compounds alone.
Inventors
- 👤 Randall S. Shipley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:16
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
In a catalytic reaction product of (A) a tetravalent titanium compound; (B) an organomagnesium component; and (C) a halide source, however if either component (B) or (C) does not contain sufficient quantities of aluminum, then (D) an organoaluminum compound is also present, said catalytic reaction product having atomic ratios of Mg:Ti is from about 0.1:1 to about 500:1; Al:Ti is from about 0.1:1 to about 500:1; excess X:Al is from about 0.0001:1 to about 5:1; the improvement which comprises employing as the tetravalent titanium compound, a mixture of at least one of (a) a tetrahydrocarbyloxytitanium compound or (b) a titanium tetrahalide with (c) a titaniumoxydihalide in a molar ratio of (a+b):(c) of from about 0.1:1 to about 10:1; and wherein excess X is the amount of excess halide above that which would be theoretically required to convert the magnesium compound to the dihalide.
Claim 2
Dependent Claim
143 words
In a catalytic reaction product of (A) a tetravalent titanium compound; (B) an organomagnesium component; and (C) a halide source, however if either component (B) or (C) does not contain sufficient quantities of aluminum, then (D) an organoaluminum compound is also present, said catalytic reaction product having atomic ratios of Mg:Ti is from about 0.1:1 to about 500:1; Al:Ti is from about 0.1:1 to about 500:1; excess X:Al is from about 0.0001:1 to about 5:1; the improvement which comprises employing as the tetravalent titanium compound, a mixture of at least one of (a) a tetrahydrocarbyloxytitanium compound or (b) a titanium tetrahalide with (c) a titaniumoxydihalide in a molar ratio of (a+b):(c) of from about 0.1:1 to about 10:1; and wherein excess X is the amount of excess halide above that which would be theoretically required to convert the magnesium compound to the dihalide.
Claim 3
Dependent Claim
102 words
A catalytic reaction product of claim 1 wherein the halide source contains aluminum; the tetrahydrocarbyloxytitanium compound is represented by the empirical formula Ti(OR) 4 wherein each R is independently an alkyl group or an aryl group having from 1 to about 20 carbon atoms; the titanium tetrahalide is titaniumtetrachloride and the titaniumoxydihalide is titaniumoxydichloride; the molar ratio of (a+b):(c) is from about 0.2:1 to about 5:1; and wherein the catalytic reaction product has the following atomic ratios Mg:Ti is from about 0.3:1 to about 100:1; Al:Ti is from about 1:1 to about 200:1; excess X:Al is from about 0.002:1 to about 2:1.
Claim 4
Dependent Claim
86 words
A catalytic reaction product of claim 2 wherein the halide source is an alkylaluminum halide; the R groups in the formula for the titanium compounds are alkyl groups having from about 1 to about 10 carbon atoms and the molar ratio of (a+b):(c) is from about 0.33:1 to about 3:1; and wherein the catalytic reaction product has the following atomic ratios Mg:Ti is from about 0.5:1 to about 75:1; Al:Ti is from about 5:1 to about 100:1; excess X:Al is from about 0.01:1 to about 1:1.
Claim 5
Dependent Claim
15 words
A catalytic reaction product of claim 3 wherein the organomagnesium component is a dihydrocarbyl magnesium.
Claim 6
Dependent Claim
23 words
A catalytic reaction product of claim 4 wherein the dihydrocarbyl magnesium is n-butyl-sec-butyl magnesium, di-n-hexyl magnesium, ethyl-n-butyl magnesium, diisopropyl magnesium or ethyl-n-hexyl magnesium.
Claim 7
Dependent Claim
42 words
A catalytic reaction product of claim 3 wherein the organomagnesium component is a complex of a dialkyl magnesium and a trialkyl aluminum wherein the atomic ratio of Mg:Al in said complex is within the range of from about 0.3:1 to about 1000:1.
Claim 8
Dependent Claim
15 words
A catalytic reaction product of claim 6 wherein the complex is di-n-butyl magnesium.1/6 triethyl aluminum.
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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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |