Patent US3876554A successfully refreshed from Google Patents.
US3876554A
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Organotin chromate polymerization catalyst
Assignee: Chemplex Co
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Filing: 1973-11-08
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Granted: 1975-04-08
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Expires: 1993-11-08
Abstract
Abstract A catalyst system for the polymerization of at least one 1-olefin comprising a mixture of a bis-trihydrocarbyltinchromate essentially of the formula: And cocatalytic amounts of an alkyl aluminum compound of the formula R.sub.a AlX.sub.b in each of which formula each R is a hydrocarbyl radical containing from 1 to about 14 carbon atoms and all R''s are the same or different, X is a halogen or an alkoxy group, a is an integer of 1-3, b is an integer of 0-2 and the sum of a and b is 3. The disclosure also includes the method of polymerizing at least one such olefin which comprises contacting the olefin under polymerizing conditions with the above catalyst system.
Inventors
- 👤 Thomas J Pullukat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:13
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
A CATALYST SYSTEM FOR THE POLYMERIZATION OF AT LEAST ONE 1-OLEFIN CONSISTING ESSENTIALLY OF AN ORGANOTIN CHROMATE ESSENTIALLY OF THE FORMULA:
Claim 2
Dependent Claim
21 words
A CATALYST SYSTEM FOR THE POLYMERIZATION OF AT LEAST ONE 1-OLEFIN CONSISTING ESSENTIALLY OF AN ORGANOTIN CHROMATE ESSENTIALLY OF THE FORMULA:
Claim 3
Dependent Claim
20 words
The catalyst system of claim 1 wherein said mixture is adsorbed on an insoluble, inorganic material having high surface area.
Claim 4
Dependent Claim
15 words
The catalyst system of claim 1 wherein said chromate is in an inert organic solvent.
Claim 5
Dependent Claim
17 words
The catalyst system of claim 1 wherein said system has an Al--Cr ratio of 2 to 30:1.
Claim 6
Dependent Claim
17 words
The catalyst system of claim 1 wherein said system has an Al--Cr ratio of 4 to 15:1.
Claim 7
Dependent Claim
11 words
The catalyst system of claim 1 wherein said chromate is bis(trimethyltin)chromate.
Claim 8
Dependent Claim
11 words
The catalyst system of claim 1 wherein said chromate is bis(triethyltin)chromate.
Claim 9
Dependent Claim
11 words
The catalyst system of claim 1 wherein said chromate is bis(triphenyltin)chromate.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |