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Patent US4945076A successfully refreshed from Google Patents.
US4945076A
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Polymerization catalyst system
Assignee: Akzo Nobel NV
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Filing: 1989-07-28
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Granted: 1990-07-31
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Expires: 2009-07-28
Abstract
Abstract The activity of olefin polymerization catalysts comprising a Group IVB transition metal compound and an aluminoxane can be improved by the addition of a hydroxysiloxane compound.
Inventors
- 👤 Andrzej M. Piotrowski
- 👤 Elliot I. Band
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:05
CPC Classifications
C; C08; C08F; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; C08F4/65922; C08F4/65925; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
27 words
An aluminoxane catalyst component for use in the polymerization of olefins which comprises aluminoxane and an effective amount of a hydroxysiloxane for increased activity for the polymerization.
Claim 2
Dependent Claim
27 words
An aluminoxane catalyst component for use in the polymerization of olefins which comprises aluminoxane and an effective amount of a hydroxysiloxane for increased activity for the polymerization.
Claim 3
Dependent Claim
44 words
A catalyst component as claimed in claim 1 wherein the hydroxysiloxane is of the formula ##STR2## where at least one R is OH and the other R groups are independently selected from --OH, alkyl and aryl and n is from 0 to about 10.
Claim 4
Dependent Claim
14 words
A catalyst component as claimed in claim 1 wherein the hydroxysiloxane is a dihydroxysiloxane.
Claim 5
Dependent Claim
25 words
A catalyst component as claimed in claim 2 wherein the hydroxysiloxane is present at from about 1% to about 10% by weight of the aluminoxane.
Claim 6
Dependent Claim
14 words
A catalyst component as claimed in claim 4 wherein the hydroxysiloxane is a dihydroxysiloxane.
Claim 7
Dependent Claim
13 words
A catalyst component as claimed in claim 5 wherein the hydroxysiloxane is 1,3-dihydroxytetramethyldisiloxane.
Claim 8
Dependent Claim
13 words
A catalyst component as claimed in claim 5 wherein the hydroxysiloxane is 1,3-dihydroxy-1,3-dimethyl-1,3-diphenyldisiloxane.
Claim 9
Dependent Claim
13 words
A catalyst component as claimed in claim 5 wherein the hydroxysiloxane is 1,3-dihydroxy-1,3-tetraphenyldisiloxane.
Claim 10
Dependent Claim
36 words
A catalyst for the polymerization of olefins which comprises a compound of a Group IVB transition metal and an aluminoxane catalyst component which comprises an effective amount of a hydroxysiloxane for increased activity for the polymerization.
Claim 11
Dependent Claim
36 words
A catalyst for the polymerization of olefins which comprises a compound of a Group IVB transition metal and an aluminoxane catalyst component which comprises an effective amount of a hydroxysiloxane for increased activity for the polymerization.
Claim 12
Dependent Claim
43 words
A catalyst as claimed in claim 9 wherein the hydroxysiloxane is of the formula ##STR3## where at least one R is OH and the other R groups are independently selected from --OH, alkyl and aryl and n is from 0 to about 10.
Claim 13
Dependent Claim
28 words
A catalyst as claimed in claim 10 wherein the hydroxysiloxane is a dihydroxysiloxane and is present at from about 1% to about 10%, by weight of the aluminoxane.
Claim 14
Dependent Claim
22 words
A catalyst as claimed in claim 11 wherein the dihydroxysiloxane contains R groups selected from the group consisting of methyl and phenyl.
Claim 15
Dependent Claim
15 words
A catalyst as claimed in claim 11 wherein the Group IVB transition metal is zirconium.
Claim 16
Dependent Claim
38 words
A catalyst as claimed in claim 13 wherein the group IVB transition metal compound is bis(cyclopentadienyl) dichlorozirconium and the hydroxysiloxane is a dihydroxysiloxane which is present at from about 1% to about 10%, by weight of the aluminoxane.
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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |