US4211731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorene phosphonites and thiophosphonites as antioxidants for organic materials
Assignee: Fidelity Union Bank
•
Filing: 1978-09-11
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Granted: 1980-07-08
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Expires: 1998-09-11
Abstract
Abstract Fluorene phosphonites and thiophosphonites of the formula, ##STR1## in which each R, independently, is alkyl or optionally substituted phenyl, each Y, independently, is oxygen or sulphur, and n is zero or 1, are useful as antioxidants. Organic materials, which are susceptible to the degradative effects of oxygen, are treated with one or more of such compounds e.g. by incorporation into the body of the organic material, in order to be stabilized against such effects.
Inventors
- 👤 Kurt Hofer
- 👤 Rudolf Moesch
- 👤 Guenther Tscheulin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:03
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5313; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/48; C07F9/4808; C07F9/4841; C07F9/485
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A compound of formula, ##STR13## in which each R, independently, is (C 1-18 )alkyl; unsubstituted phenyl; or phenyl substituted by 1 to 4 substituents selected from (C 1-9 )alkyl, chloro and bromo, with the provisos that: (1) the maximum number of alkyl substituents is three, said alkyl substituents having an aggregate of carbon atoms not exceeding 12; and (2) the maximum number of substituents selected from chloro and bromo is one; each Y, independently, is oxygen or sulfur; and n is 0 or 1.
Claim 2
Dependent Claim
84 words
A compound of formula, ##STR13## in which each R, independently, is (C 1-18 )alkyl; unsubstituted phenyl; or phenyl substituted by 1 to 4 substituents selected from (C 1-9 )alkyl, chloro and bromo, with the provisos that: (1) the maximum number of alkyl substituents is three, said alkyl substituents having an aggregate of carbon atoms not exceeding 12; and (2) the maximum number of substituents selected from chloro and bromo is one; each Y, independently, is oxygen or sulfur; and n is 0 or 1.
Claim 3
Dependent Claim
56 words
A compound according to claim 1, of formula, ##STR14## in which each R', independently, is unsubstituted phenyl; or phenyl substituted by 1 or 2 (C 1-9 )alkyl groups, said alkyl groups having an aggregate of carbon atoms not exceeding 12; all Y''s are the same and are oxygen or sulfur; and n is 0 or 1.
Claim 4
Dependent Claim
63 words
A compound according to claim 1, of formula, ##STR15## in which all R"'s are the same and are (C 12-18 ) alkyl; unsubstituted phenyl; or phenyl substituted by 1 to 3 (C 1-9 )alkyl groups, said alkyl groups having an aggregate of carbon atoms not exceeding 12; all Y''s are the same and are oxygen or sulfur; and n is 0 or 1.
Claim 5
Dependent Claim
85 words
A compound according to claim 2, of formula, ##STR16## in which all R 1 's are the same and are hydrogen or tertiary-(C 4-8 )alkyl, all R 2 's are the same and are hydrogen or (C 1-8 )alkyl, and n is zero or 1, with the provisos (i) that the aggregate of the carbon atoms in R 1 and R 2 on each phenyl group does not exceed 12, and (ii) that the R 2 's are in equivalent positions on the benzene nuclei.
Claim 6
Dependent Claim
9 words
A compound according to claim 4, of formula, ##STR17##
References Cited (Backward Citations)
US3825629A
Cited
US3903208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |