US4152502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium-modified silyl chromate catalysts for ethylene polymerization
Assignee: Union Carbide Corp
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Filing: 1978-04-12
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Granted: 1979-05-01
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Expires: 1998-04-12
Abstract
Abstract A catalyst for the preparation of ethylene polymers having higher melt indexes comprises a silyl chromate deposited on a silica support containing both aluminum and titanium.
Inventors
- 👤 Isaac J. Levine
- 👤 Frederick J. Karol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:15
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
In the method for the catalytic polymerization of ethylene alone or the copolymerization of ethylene with α-olefins containing 3 to 6 carbon atoms, the improvement which comprises using as a catalyst an amount of a silyl chromate having the formula: ##STR2## wherein each R is a hydrocarbyl radical containing from 1 to about 14 carbon atoms, deposited onto a high surface area silica support, said support previously heat-treated to a temperature of about 500°-1000° C., containing both aluminum and titanium wherein there is no subsequent activation step.
Claim 2
Dependent Claim
87 words
In the method for the catalytic polymerization of ethylene alone or the copolymerization of ethylene with α-olefins containing 3 to 6 carbon atoms, the improvement which comprises using as a catalyst an amount of a silyl chromate having the formula: ##STR2## wherein each R is a hydrocarbyl radical containing from 1 to about 14 carbon atoms, deposited onto a high surface area silica support, said support previously heat-treated to a temperature of about 500°-1000° C., containing both aluminum and titanium wherein there is no subsequent activation step.
Claim 3
Dependent Claim
10 words
Method claimed in claim 1 wherein the α-olefin is propylene.
Claim 4
Dependent Claim
10 words
Method claimed in claim 1 wherein the α-olefin is 1-hexene.
Claim 5
Dependent Claim
10 words
Method claimed in claim 1 wherein the α-olefin is 1-butene.
Claim 6
Dependent Claim
26 words
Method claimed in claim 1 wherein the catalyst also contains up to about 10% by weight of a fluoridation agent based on the weight of silica.
Claim 7
Dependent Claim
32 words
Method claimed in claim 5 wherein the amount of aluminum present is about 0.2 to about 1% by weight, calculated as Al 2 O 3 , based on the weight of silica.
Claim 8
Dependent Claim
46 words
Method claimed in claim 1 wherein the catalyst contains about 0.2 to about 1% by weight of aluminum calculated as Al 2 O 3 , and 2 to about 20% by weight of titanium, calculated as TiO 2 , all based on the weight of silica.
Claim 9
Dependent Claim
40 words
Method claimed in claim 7 wherein the silyl chromate is bis-triphenylsilyl chromate and is present in an amount sufficient to afford about 0.05 to about 2.0 weight % of chromium, calculated as Cr, based on the total weight of catalyst.
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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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |