US4950724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension polymerization of vinyl aromatic monomers to polymer having high syndiotacticity
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1988-09-27
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Granted: 1990-08-21
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Expires: 2008-09-27
Abstract
Abstract Vinyl aromatic polymers having stereo regular structure of high syndiotacticity are prepared utilizing coordination catalysts in a suspension polymerization process.
Inventors
- 👤 Michael T. Malanga
- 👤 Thomas H. Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:25
CPC Classifications
C; C08; C08F; C08F4/00; C08F12/00; C08F12/02; C08F12/04; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A process for the coordination catalyzed polymerization of vinyl aromatic monomers comprising forming a suspension of a vinyl aromatic monomer and an inert liquid comprising a fluorinated aliphatic or aromatic organic compound that is a nonsolvent for the monomer and the resulting polymer; contacting the suspended monomer with a suitable coordination catalyst under polymerization conditions so as to form a vinyl aromatic polymer having syndiotacticity as measured by 13 C NMR of 50 percent or greater; and recovering the resulting polymer.
Claim 2
Dependent Claim
81 words
A process for the coordination catalyzed polymerization of vinyl aromatic monomers comprising forming a suspension of a vinyl aromatic monomer and an inert liquid comprising a fluorinated aliphatic or aromatic organic compound that is a nonsolvent for the monomer and the resulting polymer; contacting the suspended monomer with a suitable coordination catalyst under polymerization conditions so as to form a vinyl aromatic polymer having syndiotacticity as measured by 13 C NMR of 50 percent or greater; and recovering the resulting polymer.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein the nonsolvent has a solubility parameter of 4 to 7.
Claim 4
Dependent Claim
24 words
A process according to claim 1 wherein the inert liquid is selected from the group consisting of fluorinated and fluorochlorinated aliphatic and aromatic compounds.
Claim 5
Dependent Claim
15 words
A process according to claim 1 wherein the inert liquid is a perfluorinated aliphatic compound.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein the inert liquid is perfluoro(methylcyclohexane), perfluorohexane, perfluorodecalin, or perfluorooctane.
Claim 7
Dependent Claim
25 words
A process according to claim 1 wherein the coordination catalyst comprises the reaction product of a metallocene complex of a transition metal and an aluminoxane.
Claim 8
Dependent Claim
30 words
A process according to claim 6 wherein the coordination catalyst comprises the reaction product of a monocyclopentadienyl titanium trialkoxide having 1 to 6 carbons in the alkyl group and polymethylaluminoxane.
Claim 9
Dependent Claim
14 words
A process according to claim 1 wherein the suspension additionally comprises a suspending aid.
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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |