US5120867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon-bridged transition metal compounds
Assignee: Individual
•
Filing: 1991-02-26
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Granted: 1992-06-09
•
Expires: 2011-02-26
Abstract
Abstract Silicon-bridged transition metal compounds and their use as α-olefin polymerization catalysts are disclosed. A chiral silicon-bridged metallocene catalyst polymerizes α-olefins to high isotacity with a minimum of inversions at high rates of catalyst activity. The catalyst is easily made in high yields and readily separated from atactic meso forms.
Inventors
- 👤 Howard C. Welborn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:54
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F17/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/619; C08F4/61912; C08F4/6192; C08F4/61922; C08F4/61927; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/65916; C08F4/6592; C08F4/65922; C08F4/65927; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(3-methylcyclopentadienyl)] zirconium dichloride.
Claim 2
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(3-methylcyclopentadienyl)] zirconium dichloride.
Claim 3
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(indenyl)] zirconium dichloride.
Claim 4
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(indenyl)] zirconium dichloride.
Claim 5
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-methylcyclopentadienyl)] zirconium dichloride.
Claim 6
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-methylcyclopentadienyl)] zirconium dichloride.
Claim 7
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] zirconium dichloride.
Claim 8
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] zirconium dichloride.
Claim 9
Dependent Claim
5 words
Racemic [1,1'-dimethylsilanylene-bis(3-trimethyl silanylcyclopentadienyl)] zirconium dichloride.
Claim 10
Dependent Claim
5 words
Racemic [1,1'-dimethylsilanylene-bis(3-trimethyl silanylcyclopentadienyl)] zirconium dichloride.
Claim 11
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-trimethylsilanylcyclopentadienyl)] zirconium dichloride.
Claim 12
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-trimethylsilanylcyclopentadienyl)] zirconium dichloride.
Claim 13
Dependent Claim
4 words
Racemic [1,1'-(1,1,3,3-tetramethyldisiloxanylene)-bis(4,5,6,7-tetrahydroindenyl)] zirconium dichloride.
Claim 14
Dependent Claim
4 words
Racemic [1,1'-(1,1,3,3-tetramethyldisiloxanylene)-bis(4,5,6,7-tetrahydroindenyl)] zirconium dichloride.
Claim 15
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] zirconium dichloride.
Claim 16
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] zirconium dichloride.
Claim 17
Dependent Claim
4 words
Racemic [1,1'-(2,2-dimethyl-2-silapropylene)-bis(3methylcyclopentadienyl)] zirconium dichloride.
Claim 18
Dependent Claim
4 words
Racemic [1,1'-(2,2-dimethyl-2-silapropylene)-bis(3methylcyclopentadienyl)] zirconium dichloride.
Claim 19
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(3-methylcyclopentadienyl)] hafnium dichloride.
Claim 20
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(3-methylcyclopentadienyl)] hafnium dichloride.
Claim 21
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(indenyl)] hafnium dichloride.
Claim 22
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(indenyl)] hafnium dichloride.
Claim 23
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 24
Dependent Claim
4 words
Racemic [1,1'-dimethylsilanylene-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 25
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-methylcyclopentadienyl)] hafnium dichloride.
Claim 26
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-methylcyclopentadienyl)] hafnium dichloride.
Claim 27
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 28
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 29
Dependent Claim
5 words
Racemic [1,1'-dimethylsilanylene-bis(3-trimethyl silanylcyclopentadienyl)] hafnium dichloride.
Claim 30
Dependent Claim
5 words
Racemic [1,1'-dimethylsilanylene-bis(3-trimethyl silanylcyclopentadienyl)] hafnium dichloride.
Claim 31
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-trimethylsilanylcyclopentadienyl)] hafnium dichloride.
Claim 32
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(3-trimethylsilanylcyclopentadienyl)] hafnium dichloride.
Claim 33
Dependent Claim
4 words
Racemic [1,1'-(1,1,3,3-tetramethyldisiloxanylene)-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 34
Dependent Claim
4 words
Racemic [1,1'-(1,1,3,3-tetramethyldisiloxanylene)-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 35
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 36
Dependent Claim
4 words
Racemic [1,1'-(1,1,2,2-tetramethyldisilanylene)-bis(4,5,6,7-tetrahydroindenyl)] hafnium dichloride.
Claim 37
Dependent Claim
4 words
Racemic [1,1'-(2,2-dimethyl-2-silapropylene)-bis(3-methylcyclopentadienyl)] hafnium dichloride.
Claim 38
Dependent Claim
4 words
Racemic [1,1'-(2,2-dimethyl-2-silapropylene)-bis(3-methylcyclopentadienyl)] hafnium dichloride.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |