US4104247A
Expired / Lapsed
US
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Method for stabilizing an olefin polymer
Assignee: Mitsubishi Chemical Corp
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Filing: 1977-04-06
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Granted: 1978-08-01
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Expires: 1997-04-06
Abstract
Abstract A method for stabilizing an olefin polymer which comprises treating an olefin polymer containing residual catalyst with at least one treating agent selected from the group consisting of an ester of a monohydric alcohol, a dioxane compound and an aluminic ester compound thereby to improve the color of the olefin polymer, the olefin polymer being obtained by polymerizing olefins in the presence of a Ziegler type catalyst.
Inventors
- 👤 Koich Kato
- 👤 Saburo Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:56
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/15; C08K5/156; C08K5/1575
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
58 words
A method for stabilizing a polymer selected from the group consisting of a homopolymer or a copolymer of propylene produced by olefin polymerization using a Ziegler type catalyst which comprises treating a polymer selected from the group consisting of a homopolymer or a copolymer of propylene, containing residual catalyst therein, with an aluminic ester as a treating agent.
Claim 2
Independent Claim
58 words
A method for stabilizing a polymer selected from the group consisting of a homopolymer or a copolymer of propylene produced by olefin polymerization using a Ziegler type catalyst which comprises treating a polymer selected from the group consisting of a homopolymer or a copolymer of propylene, containing residual catalyst therein, with an aluminic ester as a treating agent.
Claim 3
Dependent Claim
29 words
The method as claimed in claim 1, wherein said treating of the polymer and the treating agent is conducted with the polymer in a molten state using an extruder.
Claim 4
Dependent Claim
26 words
The method as claimed in claim 2, wherein said treating of the polymer is conducted at a temperature ranging from about 200° to about 270° C.
Claim 5
Dependent Claim
30 words
The method as claimed in claim 1, wherein the amount of said treating agent ranges from about 0.01 to about 10% by weight based on the weight of said polymer.
Claim 6
Dependent Claim
26 words
The method as claimed in claim 4, wherein said amount ranges from about 0.25 to about 5% by weight based on the weight of said polymer.
Claim 7
Dependent Claim
45 words
The method as claimed in claim 1, wherein said aluminic ester treating agent is an aluminum alkoxide represented by the chemical formula Al(OR) 3 or RA1(OR) 2 , wherein R represents an alkyl group or an aryl group each having up to 20 carbon atoms.
Claim 8
Dependent Claim
21 words
The method as claimed in claim 6, wherein said aluminic ester is an aluminum trialkoxide of the formula Al(OR) 3 .
Claim 9
Dependent Claim
34 words
The method as claimed in claim 1, wherein the concentration of the Ziegler type catalyst component in the polymer ranges from about 1 to about 200 ppm based on the weight of the polymer.
Claim 10
Dependent Claim
34 words
The method as claimed in claim 8, wherein the concentration of the Ziegler type catalyst component in the polymer ranges from about 10 to about 100 ppm based on the weight of the polymer.
Claim 11
Dependent Claim
27 words
The method as claimed in claim 1, wherein said polymer is a copolymer of propylene with ethylene having an ethylene content of 15 weight percent or less.
Claim 12
Dependent Claim
19 words
The method as claimed in claim 6, wherein R represents an alkyl group having 1 to 6 carbon atoms.
Claim 13
Dependent Claim
68 words
The method as claimed in claim 1, wherein said aluminic ester is selected from the group consisting of aluminum trimethoxide, aluminum triethoxide, aluminum tri-n-propoxide, aluminum tri-iso-propoxide, aluminum tri-n-butoxide, aluminum tri-tert-butoxide, aluminum trioctoxide, methyl aluminum dimethoxide, methylaluminum diethoxide, methyl aluminum dipropoxide, methyl aluminum dibutoxide, methyl aluminum dipentoxide, methyl aluminum hexoxide, ethyl aluminum dimethoxide, ethyl aluminum diethoxide, ethyl aluminum dibutoxide, propyl aluminum dimethoxide, propyl aluminum dipropoxide or propyl aluminum dihexoxide.
Claim 14
Dependent Claim
21 words
The method as claimed in claim 6, wherein said aluminic ester is an aluminum dialkoxide of the formula RA1(OR) 2 .
Claim 15
Dependent Claim
54 words
The method as claimed in claim 13, wherein said aluminic ester is selected from the group consisting of methyl aluminum demethoxide, methylaluminum diethoxide, methyl aluminum dipropoxide, methyl aluminum dibutoxide, methyl aluminum dipentoxide, methyl aluminum dihexoxide, ethyl aluminum dimethoxide, ethyl aluminum diethoxide, ethyl aluminum dibutoxide, propyl aluminum dimethoxide, propyl aluminum dipropoxide or propyl aluminum dihexoxide.
Claim 16
Dependent Claim
33 words
The method as claimed in claim 14, wherein said aluminic ester is selected from the group consisting of aluminum trimethoxide, aluminum triethoxide, aluminum tri-n-propoxide, aluminum tri-iso-propoxide, aluminum tri-n-butoxide, aluminum tri-tert-butoxide or aluminum trioctoxide.
References Cited (Backward Citations)
US2930783A
Cited
GB832996A
Cited
US3236805A
Cited
US3240750A
Cited
US3280058A
Cited
US3271339A
Cited
US3190852A
Cited
US3226351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |