Patent US4029862A successfully refreshed from Google Patents.
US4029862A
Expired / Lapsed
US
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Olefin polymer chlorination products having improved handling properties and process for their preparation
Assignee: Dow Chemical Co
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Filing: 1976-03-15
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Granted: 1977-06-14
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Expires: 1996-03-15
Abstract
Abstract Olefin polymer chlorination products having improved handling properties are prepared by reacting, in a fluidized-bed state, certain free-flowing, high bulk density linear olefin polymer powders with gaseous chlorine. The olefin polymer powder used is characterized by having a flowability measured as angle of repose in the range of from about 24° to about 28°, a bulk density in the range of from about 25 to about 35 pounds/cubic foot and a surface area in the range of from about 2 to about 4 square meters/gram. The individual particles of the olefin polymer particle are characterized by having particle sizes predominantly in the range of from about 300 to about 600 microns, and porosity sufficient to provide an average free volume within individual particles in the range of from about 20 to about 45 volume percent based on total particle volume.
Inventors
- 👤 Gordon Y. T. Liu
- 👤 Loyd D. Hutchinson
- 👤 S. Douglas Stain, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:59
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
209 words
In the process of chlorinating solid, linear polyethylene with gaseous chlorine while holding said polyethylene in a fluidized bed state, the improvement consisting of: utilizing a polyethylene characterized by having a flowability measured as angle of repose of from about 24° to about 28°, a bulk density in the range of from about 25 to about 35 pounds/cubic foot and a surface area in the range of from about 2 to about 4 square meters/gram, said polyethylene being composed of individual particles having particle sizes predominantly in the range of from about 300 to about 600 microns and a porosity sufficient to provide an average free volume within individual particles in the range of from about 20 to about 45 volume percent based on total particle volume wherein said polyethylene is fluidized in the presence of an inert fluidizing gas to an extent sufficient to provide a value of no greater than 4 wherein said value is obtained by dividing the height of the powder bed in the reactor by the velocity in feet/second of said fluidizing gas and wherein said polyethylene is chlorinated to an extent of up to about 30 percent by weight chlorine by conducting the chlorination reaction at a temperature not exceeding about 80° C.
Claim 2
Dependent Claim
209 words
In the process of chlorinating solid, linear polyethylene with gaseous chlorine while holding said polyethylene in a fluidized bed state, the improvement consisting of: utilizing a polyethylene characterized by having a flowability measured as angle of repose of from about 24° to about 28°, a bulk density in the range of from about 25 to about 35 pounds/cubic foot and a surface area in the range of from about 2 to about 4 square meters/gram, said polyethylene being composed of individual particles having particle sizes predominantly in the range of from about 300 to about 600 microns and a porosity sufficient to provide an average free volume within individual particles in the range of from about 20 to about 45 volume percent based on total particle volume wherein said polyethylene is fluidized in the presence of an inert fluidizing gas to an extent sufficient to provide a value of no greater than 4 wherein said value is obtained by dividing the height of the powder bed in the reactor by the velocity in feet/second of said fluidizing gas and wherein said polyethylene is chlorinated to an extent of up to about 30 percent by weight chlorine by conducting the chlorination reaction at a temperature not exceeding about 80° C.
Claim 3
Dependent Claim
59 words
The process of claim 1 wherein said polymer is chlorinated to an extent of up to about 65 percent by weight chlorine comprising utilization of reaction temperatures not exceeding about 80° C. to provide a chlorine content of up to about 30 percent by weight and thereafter maintaining the reaction temperature from about 60° C. to about 100° C.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |