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Patent US4755546A successfully refreshed from Google Patents.
US4755546A
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Stabilized olefin polymers
Assignee: Borg Warner Corp
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Filing: 1985-03-06
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Granted: 1988-07-05
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Expires: 2005-03-06
Abstract
Abstract Thermal stabilization of olefin polymers, particularly polypropylene. Stabilization is accomplished by means of an ester of a pentaerythritol monoacetal. The ester contains a phenolic group.
Inventors
- 👤 Ingenuin Hechenbleikner
- 👤 William P. Enlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:28
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/156; C08K5/1575
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
An olefin polymer composition comprising an olefin polymer and a minor stabilizing effective amount of an ester of a pentaerythritol monoacetal having the structure ##STR3## where R is alkyl, cycloalkyl or aralkyl having 3-10 carbon atoms, R 1 is alkyl of 1-6 carbon atoms, R 2 is lower alkyl or hydrogen, X is alkylphenyl or (hydroxyphenyl)alkyl, and n is 0-3.
Claim 2
Dependent Claim
60 words
An olefin polymer composition comprising an olefin polymer and a minor stabilizing effective amount of an ester of a pentaerythritol monoacetal having the structure ##STR3## where R is alkyl, cycloalkyl or aralkyl having 3-10 carbon atoms, R 1 is alkyl of 1-6 carbon atoms, R 2 is lower alkyl or hydrogen, X is alkylphenyl or (hydroxyphenyl)alkyl, and n is 0-3.
Claim 3
Dependent Claim
25 words
An olefin polymer composition comprising polypropylene and a minor stabilizing effective amount of the ester acetal of claim 1 wherein X is an aromatic group.
Claim 4
Dependent Claim
25 words
An olefin polymer composition comprising polypropylene and a minor stabilizing effective amount of the ester acetal of claim 1 wherein X is a phenolic group.
Claim 5
Dependent Claim
25 words
An olefin polymer composition comprising polypropylene and a minor stabilizing effective amount of the ester acetal of claim 1 wherein X is an alkylphenyl group.
Claim 6
Dependent Claim
22 words
An olefin polymer composition comprising polypropylene and a minor stabilizing effective amount of the ester acetal of claim 1 and a dialkylthiodipropionate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |