US5744556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas phase polymerization employing unsupported catalysts
Assignee: Univation Technologies LLC
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Filing: 1996-09-13
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Granted: 1998-04-28
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Expires: 2016-09-13
Abstract
Abstract A process for the gas-phase polymerization of polymers which allows for the introduction of an unsupported polymerization catalyst system into the gas-phase reactor, wherein the unsupported polymerization catalyst system comprises (i) a non-volatile materials fraction containing a polymerization catalyst; (ii) a solvent fraction which is at least partially miscible with the non-volatile materials fraction and which is sufficiently volatile to allow for the formation of polymerization catalyst particles when the mixture of the solvent fraction and the non-volatile materials fraction is sprayed into the reactor; (iii) a compressed fluid; and (iv) optionally a slowly vaporizing solvent.
Inventors
- 👤 George Ernest Keller
- 👤 Keith Ernest Carmichael
- 👤 Jean Bowman Cropley
- 👤 Eldon Ronald Larsen
- 👤 Arakalud Venkatapathia Ramamurthy
- 👤 Mark Wilton Smale
- 👤 Timothy Todd Wenzel
- 👤 Clark Curtis Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:37
CPC Classifications
C; C08; C08F; C08F10/00; C08F2/00; C08F2/34; C08F210/00; C08F210/16; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/619; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/943
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A gas-phase polymerization of monomers comprising: a) introducing a monomer or monomers into a gas-phase reactor, b) introducing an unsupported polymerization catalyst system into the gas-phase reactor, wherein the unsupported polymerization catalyst system comprises: (i) a non-volatile materials fraction containing a polymerization catalyst; (ii) a solvent fraction which is at least partially miscible with the non-volatile materials fraction and which is sufficiently volatile to allow for the formation of polymerization catalyst particles when the mixture of the solvent fraction and the non-volatile materials fraction is sprayed into the reactor; (iii) a compressed fluid having a critical temperature between 273K and 505K and in its supercritical condition; and (iv) optionally a slowly vaporizing solvent; and c) recovering the polymer product.
Claim 2
Dependent Claim
119 words
A gas-phase polymerization of monomers comprising: a) introducing a monomer or monomers into a gas-phase reactor, b) introducing an unsupported polymerization catalyst system into the gas-phase reactor, wherein the unsupported polymerization catalyst system comprises: (i) a non-volatile materials fraction containing a polymerization catalyst; (ii) a solvent fraction which is at least partially miscible with the non-volatile materials fraction and which is sufficiently volatile to allow for the formation of polymerization catalyst particles when the mixture of the solvent fraction and the non-volatile materials fraction is sprayed into the reactor; (iii) a compressed fluid having a critical temperature between 273K and 505K and in its supercritical condition; and (iv) optionally a slowly vaporizing solvent; and c) recovering the polymer product.
Claim 3
Dependent Claim
23 words
The polymerization of claim 1 wherein the monomer or monomers are C 2 to C 10 linear or branched alkenes, dialkenes or trialkenes.
Claim 4
Dependent Claim
18 words
The polymerization of claim 2 wherein the monomers are ethene, propene, butene, pentene, hexene, octene or 1,3 butadiene.
Claim 5
Dependent Claim
16 words
The polymerization of claim 1 wherein the catalyst system contains at least one transition metal compound.
Claim 6
Dependent Claim
12 words
The polymerization of claim 4 wherein the catalyst system is a metallocene.
Claim 7
Dependent Claim
19 words
The polymerization of claim 1 wherein the solvent is a normal or branched alkanes less than C 8 .
Claim 8
Dependent Claim
36 words
The polymerization of claim 1 utilizing a slow vaporizing solvent selected from the group consisting of normal alkanes greater than C 8 , branched alkanes greater than C 8 and oxo-alkanes greater than C 2 .
Claim 9
Dependent Claim
28 words
The polymerization of claim 1 wherein the compressed fluid is selected from the group consisting of carbon dioxide, nitrous oxide, ethane, propane, ethene, chlorotrifluoroethane, monofluoromethane, ammonia and xenon.
Claim 10
Dependent Claim
21 words
The polymerization of claim 1 wherein catalyst system is introduced into the reactor at a pressure of less than 10,000 psig.
Claim 11
Dependent Claim
13 words
The polymerization of claim 9 wherein the pressure is less than 3,000 psig.
Claim 12
Dependent Claim
27 words
The polymerization of claim 1 wherein the non-volatile materials fraction is greater than 0.01% by weight and less than 70% by weight of the polymerization catalyst system.
Claim 13
Dependent Claim
17 words
The polymerization of claim 11 wherein the non-volatile materials fraction is greater 1.0% and less than 40%.
Claim 14
Dependent Claim
20 words
The polymerization of claim 1 wherein the solvent fraction in the polymerization catalyst system is less than 95% by weight.
Claim 15
Dependent Claim
23 words
The polymerization of claim 1 wherein the amount of compressed fluid in the polymerization catalyst system is between 1% and 99.99% by weight.
Claim 16
Dependent Claim
23 words
The polymerization of claim 14 wherein the amount of compressed fluid in the polymerization catalyst system is between 5% and 99.9% by weight.
References Cited (Backward Citations)
US4582731A
Cited
US4734451A
Cited
US4734227A
Cited
US4826699A
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JPH01176437A
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US4916108A
Cited
US5326835A
Cited
US5391654A
Cited
US5290827A
Cited
US5317036A
Cited
US5464154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-27 | 2001-10-27 | 2002-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-27 | 2005-10-27 | 2006-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-27 | 2009-10-27 | 2010-04-28 | $7700.00 | Window Closed / Lapsed |