Patent US4117219A successfully refreshed from Google Patents.
US4117219A
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Process for producing stabilized polyolefins
Assignee: Mitsubishi Chemical Corp
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Filing: 1977-08-01
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Granted: 1978-09-26
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Expires: 1997-08-01
Abstract
Abstract A process for producing stabilized polyolefins comprising adding an epoxide to a polyolefin slurry obtained through polymerization of α-olefins in the presence of a catalyst containing a halide of a transition metal and an organoaluminum compound to render the catalyst remaining in the polymer inactive, and then subjecting the polyolefin slurry after the above inactivation treatment to an evaporation treatment. The process is extremely simple and results in polyolefins and molded products which are highly stable against discoloration and heat.
Inventors
- 👤 Genjiro Kakogawa
- 👤 Tetsumi Suzuki
- 👤 Nobuaki Goko
- 👤 Koji Mukuraguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:45
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A process for producing a stabilized polyolefin, consisting essentially of the steps of: adding an epoxide of 2 to 8 carbon atoms to a polyolefin slurry obtained through polymerization of an α-olefin in the presence of a catalyst containing a halide of a transition metal and an organoaluminum compound ahd having a catalytic efficiency of more than 5,000 to render the catalyst remaining in the polymer inactive; and then evaporating volatile materials from the polyolefin slurry after the inactivation treatment.
Claim 2
Dependent Claim
80 words
A process for producing a stabilized polyolefin, consisting essentially of the steps of: adding an epoxide of 2 to 8 carbon atoms to a polyolefin slurry obtained through polymerization of an α-olefin in the presence of a catalyst containing a halide of a transition metal and an organoaluminum compound ahd having a catalytic efficiency of more than 5,000 to render the catalyst remaining in the polymer inactive; and then evaporating volatile materials from the polyolefin slurry after the inactivation treatment.
Claim 3
Dependent Claim
13 words
The process as defined in claim 1, wherein the epoxide is propylene oxide.
Claim 4
Dependent Claim
33 words
The process as defined in claim 1, wherein the amount of the epoxide to that of the catalyst component in the polyolefin slurry is less than about 15 : 1 by molar ratio.
Claim 5
Dependent Claim
25 words
The process as defined in claim 1, wherein the epoxide is added to the polyolefin slurry prior to the removal of the unreacted monomer therefrom.
Claim 6
Dependent Claim
24 words
The process as defined in claim 1, wherein the epoxide is added to the polyolefin slurry after the removal of the unreacted monomer therefrom.
Claim 7
Dependent Claim
29 words
The process as defined in claim 1, wherein the inactivation treatment is carried out at a temperature of between about 70° C and the melting point of the polymer.
Claim 8
Dependent Claim
18 words
The process as defined in claim 6, wherein the temperature is between about 80° C and 100° C.
Claim 9
Dependent Claim
22 words
The process as defined in claim 1, wherein the inactivation treatment is effected for a time between about 10 and 60 minutes.
Claim 10
Dependent Claim
19 words
The process as defined in claim 1, wherein the evaporation treatment is effected by a flashing or purging treatment.
Claim 11
Dependent Claim
21 words
The process as defined in claim 1, wherein the polymerization of the α-olefins is effected in the presence of a diluent.
Claim 12
Dependent Claim
18 words
The process as defined in claim 10, wherein the diluent is a liquid monomer used for the polymerizaton.
Claim 13
Dependent Claim
12 words
The process as defined in claim 1, wherein the α-olefin is propylene.
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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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |