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US5064918A
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Ziegler-Natta polymerization of styrene monomer
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1991-02-27
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Granted: 1991-11-12
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Expires: 2011-02-27
Abstract
Abstract A process for preparing improved yields of styrene polymers by means of polymerization with a Ziegler-Natta type polymerization catalyst wherein the styrene monomer is first contacted with a hydrogenating agent under hydrogenation conditions such that substantially all phenylacetylene contained in the monomer stream is hydrogenated and thereafter contacting with a Ziegler-Natta catalyst.
Inventors
- 👤 Michael T. Malanga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:14
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A process for preparing improved yields of styrene polymers the steps of the process comprising: a) providing a monomer stream comprising styrene and contaminating amounts of phenylacetylene; b) contacting the monomer stream with a hydrogenating agent under hydrogenation conditions such that substantially all the phenylacetylene is hydrogenated without substantial hydrogenation of styrene; c) contacting the monomer stream with a catalyst comprising a titanium monocyclopentadienyl complex under polymerization conditions, so as to cause at least partial polymerization of styrene; and d) recovering the resulting styrene polymer.
Claim 2
Dependent Claim
85 words
A process for preparing improved yields of styrene polymers the steps of the process comprising: a) providing a monomer stream comprising styrene and contaminating amounts of phenylacetylene; b) contacting the monomer stream with a hydrogenating agent under hydrogenation conditions such that substantially all the phenylacetylene is hydrogenated without substantial hydrogenation of styrene; c) contacting the monomer stream with a catalyst comprising a titanium monocyclopentadienyl complex under polymerization conditions, so as to cause at least partial polymerization of styrene; and d) recovering the resulting styrene polymer.
Claim 3
Dependent Claim
40 words
A process according to claim 1 wherein the hydrogenation is conducted by contacting the monomer stream with a noble metal or reduced copper catalyst in the presence of a hydrogenating agent at a temperature from 20° C. to 45° C.
Claim 4
Dependent Claim
13 words
A process according to claim 2 wherein the hydrogenating agent is hydrogen gas.
Claim 5
Dependent Claim
16 words
A process according to claim 3 wherein the temperature is from 22° C. to 30° C.
Claim 6
Dependent Claim
48 words
A process according to claim 1 wherein the catalyst comprises a titanium monocyclopentadienyl complex compound containing at least one metal-O; metal-C: metal-N: metal-P; metal-S or metal-halogen bond and an organoaluminum compound containing at least one oxygen atom bound to the aluminum atom or located between two aluminum atoms.
Claim 7
Dependent Claim
14 words
A process according to claim 5 wherein the catalyst comprises cyclopentadienyltitanium triisopropoxide and methylaluminoxane.
Claim 8
Dependent Claim
23 words
A process according to claim 1 wherein a mixture of styrene monomer and one or more olefin monomers other than styrene is polymerized.
References Cited (Backward Citations)
US3112301A
Cited
US3105858A
Cited
US4389517A
Cited
US4614729A
Cited
US4680353A
Cited
US4822936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |