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US4052364A
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Bis(hydroxy-di-tert.butylphenyl)-alkanoic acid esters
Assignee: Hoechst AG
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Filing: 1975-01-30
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Granted: 1977-10-04
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Expires: 1995-01-30
Abstract
Abstract Bis(hydroxyphenyl)-alkanoic acid esters the phenyl radicals of which are alkylated twice are prepared by alkylation of corresponding compounds carrying one alkyl radical at the nucleus, using isobutylene as alkylating agent. The alkanoic acid esters are obtained in crystalline form and are suitable as stabilizers for polyolefins.
Inventors
- 👤 Yani Christidis
- 👤 Otto Mauz
- 👤 Eberhard Prinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:03
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; C08K5/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
A crystalline bis(hydroxy-di-tert-butylphenyl)-alkanoic acid diester of the formula I ##STR3## in which x is zero or a whole number in the range of from 1 to 8 and y is a whole number in the range of from 2 to 18.
Claim 2
Dependent Claim
41 words
A crystalline bis(hydroxy-di-tert-butylphenyl)-alkanoic acid diester of the formula I ##STR3## in which x is zero or a whole number in the range of from 1 to 8 and y is a whole number in the range of from 2 to 18.
Claim 3
Dependent Claim
29 words
A method of stabilizing a polyolefin which comprises incorporating therein from 0.005 to 5% by weight of said polyolefin of a bis(hydroxy-di-tert-butylphenyl)-alkanoic acid diester as defined in claim 1.
Claim 4
Dependent Claim
17 words
A polyolefinic thermoplastic material containing an effective amount of the compound of claim 1 as a stabilizer.
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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |