US5036034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for producing hemiisotactic polypropylene
Assignee: Fina Technology Inc
•
Filing: 1989-10-10
•
Granted: 1991-07-30
•
Expires: 2009-10-10
Abstract
Abstract This invention is for a metallocene compound which can be used in a catalyst system to produce hemiisotactic polymer. The compound is a bridged metallocene compound having dissimilar cyclopentadienyl groups and no bi-lateral symmetry. One example of the compound is isopropylidene(3-methylcyclopentadienyl-1-fluorenyl) zirconium dichloride. The catalyst of this invention can be converted to an ionic metallocene catalyst by an ionizing agent, such as methylaluminoxane. The polymer produced with this catalyst is characterized by having an isotactic structure effecting only every other asymmetric carbon atom. In the case of polypropylene, every other methyl group is on the same side of the principal polymer chain as represented by a Fisher projection. The remaining methyl groups can be either on the same side or on the opposite side of the principal polymer chain. The polymer produced with the catalyst of this invention can be used as a plasticizer.
Inventors
- 👤 John A. Ewen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:05
CPC Classifications
C; C08; C08F; C08F4/00; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C07; C07F; C07F17/00; C08F10/00; C08F10/04; C08F10/06; C08F110/00; C08F110/04; C08F110/06; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65904; C08F4/65912; C08F4/6592; C08F4/65922; C08F4/65927; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A metallocene compound used to make a catalyst to produce hemiisotactic olefin polymers comprising the general formula: R"(CpR.sub.n) (CpR'.sub.m)MHal.sub.2 where Cp is cyclopentadienyl or a substituted cyclopentadienyl, each R and R' is a hydrocarbyl radical having from 1-20 carbon atoms and is the same or different and is selected such that CpR' m is a sterically different ring from CpR n resulting in a lack of bi-lateral symmetry for the compound, R" is a structural bridge imparting stereorigidity to the compound, M is a Group 3, Group 4, Group 5 or Group 6 metal, n is from 0 to 4, m is from 0 to 4 and Hal is a halogen.
Claim 2
Dependent Claim
111 words
A metallocene compound used to make a catalyst to produce hemiisotactic olefin polymers comprising the general formula: R"(CpR.sub.n) (CpR'.sub.m)MHal.sub.2 where Cp is cyclopentadienyl or a substituted cyclopentadienyl, each R and R' is a hydrocarbyl radical having from 1-20 carbon atoms and is the same or different and is selected such that CpR' m is a sterically different ring from CpR n resulting in a lack of bi-lateral symmetry for the compound, R" is a structural bridge imparting stereorigidity to the compound, M is a Group 3, Group 4, Group 5 or Group 6 metal, n is from 0 to 4, m is from 0 to 4 and Hal is a halogen.
Claim 3
Dependent Claim
15 words
A metallocene compound as recited in claim 1 wherein M is titanium, zirconium and hafnium.
Claim 4
Dependent Claim
12 words
A metallocene compound as recited in claim 1 wherein Hal is chlorine.
Claim 5
Dependent Claim
14 words
A metallocene compound as recited in claim 1 wherein the compound is isopropylidene(3-methylcyclopentadienyl-1-fluorenyl)zirconium dichloride.
Claim 6
Dependent Claim
143 words
A metallocene catalyst to produce hemiisotactic olefin polymers comprising: a) a metallocene compound; and b) an ionizing agent; wherein the metallocene compound comprises the general formula: R"(CpR.sub.n (CpR'.sub.m)MHal.sub.2 where Cp is cyclopentadienyl or a substituted cyclopentadienyl, each R and R' is a hydrocarbyl radical having from 1-20 carbon atoms and is the same or different and is selected such that CpR' m is a sterically different ring from CpR n resulting in a lack of bi-lateral symmetry for the compound, R" is a structural bridge imparting stereorigidity to the compound, M is a Group 3, Group 4, Group 5 or Group 6 metal, n is from 0 to 4, m is from 0 to 4 and Hal is a halogen and wherein the ionizing agent converts a neutral metallocene compound to a metallocene cation which operates as a catalyst to produce hemiisotactic polymers.
Claim 7
Dependent Claim
143 words
A metallocene catalyst to produce hemiisotactic olefin polymers comprising: a) a metallocene compound; and b) an ionizing agent; wherein the metallocene compound comprises the general formula: R"(CpR.sub.n (CpR'.sub.m)MHal.sub.2 where Cp is cyclopentadienyl or a substituted cyclopentadienyl, each R and R' is a hydrocarbyl radical having from 1-20 carbon atoms and is the same or different and is selected such that CpR' m is a sterically different ring from CpR n resulting in a lack of bi-lateral symmetry for the compound, R" is a structural bridge imparting stereorigidity to the compound, M is a Group 3, Group 4, Group 5 or Group 6 metal, n is from 0 to 4, m is from 0 to 4 and Hal is a halogen and wherein the ionizing agent converts a neutral metallocene compound to a metallocene cation which operates as a catalyst to produce hemiisotactic polymers.
Claim 8
Dependent Claim
21 words
A metallocene catalyst as recited in claim 5 wherein M is selected from the group consisting of titanium, zirconium and hafnium.
Claim 9
Dependent Claim
12 words
A metallocene catalyst as recited in claim 5 wherein Hal is chlorine.
Claim 10
Dependent Claim
14 words
A metallocene catalyst as recited in claim 5 wherein the compound is isopropylidene(3-methylcyclopentadienyl-1-fluorenyl)zirconium dichloride.
References Cited (Backward Citations)
US4542199A
Cited
US4530914A
Cited
US4841004A
Cited
US4849487A
Cited
US4794096A
Cited
US4892851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |