Patent EP0423872A2 successfully refreshed from Google Patents.
EP0423872A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Olefin polymerization catalyst
Assignee: Akzo Nobel NV
•
Filing: 1990-10-11
•
Granted: —
•
Expires: 2010-10-11
Abstract
Abstract Silicon or siloxane diols react with dicyclopentadienyl zirconium compounds to form catalytically active compositions. These compositions can be used to polymerize ethylene when combined with methylaluminoxane.
Inventors
- 👤 Andrzej Mieczyslaw Piotrowski
- 👤 Elliot Isaac Band
- 👤 Johst Hermann Burk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:20
CPC Classifications
C; C07; C07F; C07F17/00; 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
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
The reaction product of a silicon of siloxane diol and a dicyclopentadienyl zirconium.
Claim 2
Dependent Claim
13 words
The reaction product of a silicon of siloxane diol and a dicyclopentadienyl zirconium.
Claim 3
Dependent Claim
12 words
A product as claimed in Claim 1 which is admixed with methylaluminoxane.
Claim 4
Dependent Claim
25 words
The product of Claim 1 wherein the silicon diol is of the formula where R is selected from the group consisting of alkyl and aryl.
Claim 5
Dependent Claim
25 words
The product of Claim 1 wherein the siloxane diol is of the formula where R is selected from the group consisting of alkyl and aryl.
Claim 6
Dependent Claim
9 words
The product of Claim 1 which is cyclo-1,3 bis(dicyclopentadienylzirconoxy(IV))-5,7.
Claim 7
Dependent Claim
10 words
The product of Claim 1 which is cyclo-1,7 bis(dicyclopentadienylzirconoxy(IV))-3,5,9,11 tetraphenylsiloxane).
Claim 8
Dependent Claim
9 words
The product of Claim 1 which is cyclo-1,3-bis(dicyclopentadienylzirconoxy(IV))-5,7 bis(diphenylsiloxane).
Claim 9
Dependent Claim
10 words
The product of Claim 1 which is cyclo-1,7 bis(dicyclopentadienylzirconoxy(IV))-3,5,9,11 tetrakis(diphenylsiloxane).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.