Patent US4906329A successfully refreshed from Google Patents.
US4906329A
Expired / Lapsed
US
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Flash-drying process for a solvent solution of a polymer or copolymer
Assignee: Mitsui Chemicals Inc
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Filing: 1987-06-16
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Granted: 1990-03-06
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Expires: 2007-06-16
Abstract
Abstract In a flash-drying process which comprises flashing a solvent solution of a polymer or copolymer maintained at an elevated temperature and pressure into a flashing zone maintained at a lower pressure than the pressure of the solvent solution through a means for releasing said elevated pressure, thereby evaporating and separating the solvent from the solvent solution, the improvement wherein an inert stripping agent is fed into a flow of the solvent solution at any point between said pressure-releasing means and said flashing zone.
Inventors
- 👤 Kenichi Tominari
- 👤 Yuzi Miura
- 👤 Kunio Furutachi
- 👤 Yoshihiro Tsukamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:11
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/06; C08F; C08F6/00; C08F6/06; C08F6/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A flash-drying process for removing a solvent from a liquid solution comprising a solvent and an elastomeric polymer or copolymer dissolved in said solvent and said solution having a viscosity of about 10 to about 10,000 centipoises maintained at an elevated temperature and pressure, which comprises flashing said solution into a flashing zone via a pipeline, said flashing zone being provided in connection to the end of said pipeline and being maintained at a lower pressure than the pressure of the solvent solution through a means for releasing said elevated pressure, and feeding an inert stripping agent into the solution at any point between said pressure-releasing means and said flashing zone, thereby evaporating and separating the solvent from the solution.
Claim 2
Dependent Claim
120 words
A flash-drying process for removing a solvent from a liquid solution comprising a solvent and an elastomeric polymer or copolymer dissolved in said solvent and said solution having a viscosity of about 10 to about 10,000 centipoises maintained at an elevated temperature and pressure, which comprises flashing said solution into a flashing zone via a pipeline, said flashing zone being provided in connection to the end of said pipeline and being maintained at a lower pressure than the pressure of the solvent solution through a means for releasing said elevated pressure, and feeding an inert stripping agent into the solution at any point between said pressure-releasing means and said flashing zone, thereby evaporating and separating the solvent from the solution.
Claim 3
Dependent Claim
41 words
The process of claim 1 wherein the inert stripping agent is a member selected from the group consisting of water, steam, nitrogen gas, carbon dioxide gas, hydrocarbons having 1 to 4 carbon atoms and mixtures of at least two of these.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein the elastomeric polymer or copolymer is a polymer or copolymer selected from the group consisting of an ethylene/alpha-olefin copolymer rubber, an ethylene/alpha-olefin/diene copolymer rubber, a propylene/alpha-olefin copolymer rubber and diene rubbers.
Claim 5
Dependent Claim
33 words
The process of claim 1 wherein the amount of the inert stripping agent fed is about 5 mole% to about 300 mole% based on the total amount of the solvent in the solution.
Claim 6
Dependent Claim
32 words
The process of claim 1 wherein the solution is maintained at a temperature of about 100° to about 250° C. and a pressure of about 3 to about 40 kg/cm 2 .G.
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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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |