US5064918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 14:18
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)
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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 |