US3678095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted derivatives of malonic acid useful as stabilizers
Assignee: Novartis Corp
•
Filing: 1970-07-17
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Granted: 1972-07-18
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Expires: 1990-07-17
Abstract
Abstract Derivatives of malonic acid substituted with groups containing a hindered phenol are disclosed. The compounds are stabilizers suitable for stabilizing numerous substrates of organic material subject to oxidative deterioration, in particular polypropylene. Synergistic combinations of these compounds and dialkyl thiodipropionates are disclosed.
Inventors
- 👤 Martin Dexter
- 👤 John Denon Spivack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:52
CPC Classifications
C; C07; C07C; C07C255/00; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; C08K5/13; C08K5/134; C08K5/1345; C09; C09K; C09K15/00; C09K15/04; C09K15/06; C09K15/08; C10; C10M; C10M3/00; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/287; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/105; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10M2215/00; C10M2215/08; C10M2215/082; C10M2215/16; C10M2215/24; C10M2215/28; C10M2219/00; C10M2219/08; C10M2219/082; C10M2219/085; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10M2227/00; C10M2227/02; C10M2229/00; C10M2229/04; C10M2229/041; C10M2229/043; C10M2229/044
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
9 words
A compound claimed in claim 1 wherein R5 is
Claim 2
Dependent Claim
13 words
A compound claimed in claim 1 wherein R1 and R2 are tertiary butyl.
Claim 3
Dependent Claim
13 words
A compound claimed in claim 2 where R1 and R2 are tertiary butyl.
Claim 4
Dependent Claim
53 words
A compound selected from the group consisting of di-m-methylphenyl-2,2,bis(3'' ,5''-di-t-butyl-4''-hydroxybenzyl) malonate; di-4''-sec-butylphenyl-2,2-bis-(3'''' ,5''''-di-t-butyl-4''''-hydroxybenzyl) malonate; di-4''-isoamylphenyl-2,2-bis (3'''' ,5''''-di-t-butyl-4'''' -hydroxybenzyl)malonate; di-4''-t-hexylbenzyl-2,2,-bis(3'''' ,5''''-di-t-butyl-4''''-hydroxybenzyl) malonate; di-2''-methyl-4''-t-hexylbenzyl-2,2-bis (3'''' ,5''''-di-t-butyl-4''''-hydroxybenzyl) malonate; di-4''-cyclohexylbenzyl-2,2-bis(3'''' ,5''''-di-t-butyl-4''''-hydroxybenzyl) malonate; di-4''-phenylphenyl-2,2-bis (3'''' ,5''''-di-t-butyl-4''''-hydroxybenzyl) malonate; di-4''-t-octylphenyl-2,2-bis(3''''t-butyl-5''''-methyl-4''''-hydroxybenzyl) malonate; di-4''-t-octylphenyl-2,2,bis (3'''' ,5'''' dimethyl-4''''-hydroxybenzyl) malonate; di-4''-t-octylphenyl-2,2-bis (3'''' ,5''''-di-t-butyl-4'''' -hydroxybenzyl) malonate; diphenyl-2,2-bis (3'' 5''-di-t-butyl-4''-hydroxybenzyl) malonate; di-4''di-t-butylphenyl-2,2-bis (3'''' ,5'''' -di-t-butyl-4''''-hydroxybenzyl) malonate.
Claim 5
Dependent Claim
4 words
Di-4'' -t-octylphenyl-2,2-bis-(3'''' ,5''''-di-t-butyl-4''-hydroxybenzyl) malonate.
Claim 6
Dependent Claim
2 words
Diphenyl-2,2-bis(3'',5''-di-t-butyl-4''-hydroxybenzyl) malonate.
Claim 7
Dependent Claim
3 words
Di-4''-t-butylphenyl-2,2-bis-(3'''' ,5''''-di-t-butyl-4''''-hydroxybenzyl) malonate.
References Cited (Backward Citations)
US3112338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |