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Patent US5045577A successfully refreshed from Google Patents.
US5045577A
Expired / Lapsed
US
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Process for the preparation of heat-stable olefin polymers
Assignee: BASF Corp
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Filing: 1989-06-21
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Granted: 1991-09-03
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Expires: 2009-06-21
Abstract
Abstract The addition of hindered amines in combination with a phosphorus-III-ester to the polymerization of olefins on spherical Ziegler-Natta catalysts effects a thermo-oxidative stabilization of the prepared polymers. Phenolic antioxidants may be used additionally.
Inventors
- 👤 Rolf Mulhaupt
- 👤 Paul Dubs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:20
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08F; C08F10/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
66 words
A process for the preparation of olefin polymers stable to heat and oxidation by polymerization on a solid catalyst obtained by reaction of an aluminium alkyl with a solid product comprising a magnesium dihalide in active form and a titanium compound, which process comprises adding to the polymerization zone at least one 2,2,6,6-tetramethylpiperidine compound as a stabilizer and at least one phosphorus-III ester as a costabilizer.
Claim 2
Dependent Claim
66 words
A process for the preparation of olefin polymers stable to heat and oxidation by polymerization on a solid catalyst obtained by reaction of an aluminium alkyl with a solid product comprising a magnesium dihalide in active form and a titanium compound, which process comprises adding to the polymerization zone at least one 2,2,6,6-tetramethylpiperidine compound as a stabilizer and at least one phosphorus-III ester as a costabilizer.
Claim 3
Dependent Claim
21 words
A process according to claim 1, which comprises adding as the additional co-stabilizer an antioxidant of the sterically hindered phenol type.
Claim 4
Dependent Claim
16 words
A process according to claim 1, wherein the catalyst comprises at least one electron donor compound.
Claim 5
Dependent Claim
15 words
A process according to claim 3, wherein the electron donor is a carboxylic acid ester.
Claim 6
Dependent Claim
22 words
A process according to claim 3, wherein the electron donor used is an organic silicon compound having at least one Si--O--C bond.
Claim 7
Dependent Claim
20 words
A process according to claim 1, wherein the magnesium dihalide is magnesium dichloride and the titanium compound is titanium tetrachloride.
Claim 8
Dependent Claim
30 words
A process according to claim 1, wherein the stabilizer used is a compound the molecule of which contains both at least one 2,2,6,6-tetramethylpiperidine group and at least one s-triazine group.
Claim 9
Dependent Claim
22 words
A process according to claim 7, wherein the stabilizer used is a compound of formula ##STR19## wherein n is 4 to 10.
Claim 10
Dependent Claim
28 words
A process according to claim 1, wherein the co-stabilizer used is a phosphorus-III ester which contains at least one group P--O--Ar, Ar being a monoalkylphenyl or dialkylphenyl radical.
Claim 11
Dependent Claim
13 words
A process according to claim 1, wherein the co-stabilizer used is tris-(2,4-di-tert-butylphenyl) phosphite.
Claim 12
Dependent Claim
12 words
A process according to claim 1, wherein the co-stabilizer used is tetrakis-(2,4-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite.
Claim 13
Dependent Claim
15 words
A process according to claim 2, wherein octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate is used as the additional co-stabilizer.
Claim 14
Dependent Claim
13 words
A stabilized polyolefin which has been prepared by the process of claim 1.
Claim 15
Dependent Claim
7 words
A stabilized polypropylene according to claim 13.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |