US3721704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esters of (dialkyl-4-hydroxy-phenyl)malonic acid and related compounds
Assignee: Novartis Corp
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Filing: 1967-02-17
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Granted: 1973-03-20
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Expires: 1987-02-17
Abstract
Abstract Derivatives of malonic acid substituted with groups containing a hindered phenol are disclosed. A preferred compound is di-noctadecyl-2,2-bis-(3'',5''-di-t-butyl-4''-hydroxybenzyl) malonate. 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
- 👤 M Dexter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
C; C07; C07C; C07C255/00; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; C08K5/16; Y; Y10; Y10S; Y10S524/00; Y10S524/925; Y10S524/929
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
17 words
A Compound as claimed in claim 1 wherein A is alkylene of one to six carbon atoms.
Claim 2
Dependent Claim
19 words
A compound as claimed in claim 1 wherein R1 and R2 are alkyl or one to eight carbon atoms.
Claim 3
Dependent Claim
37 words
A bis(3,5-dialkyl-4-hydroxybenzyl) malonic ester of the formula wherein R1 and R2 are alkyl radicals having from one to 18 carbon atoms and R'', R'''', R'''''', and R are alkyl radicals having from one to nine carbon atoms.
Claim 4
Dependent Claim
18 words
A compound as claimed in claim 3 wherein R5 is alkyl of one to four carbon atoms or
Claim 5
Dependent Claim
14 words
A compound as claimed in claim 5 wherein R1 and R2 are tertiary butyl.
Claim 6
Dependent Claim
36 words
A compound as claimed in claim 5 wherein n is O; Y and Y1 are and R3 and R4 independently are alkyl of one to 24 carbon atoms and alkylthioalkyl; R5 is and A is methylene.
Claim 7
Dependent Claim
11 words
A compound as claimed in claim 1 which is diethyl-2,2-bis-(3'',5''di-t-butyl-4-hydroxybenzyl) malonate.
Claim 8
Dependent Claim
11 words
A compound as claimed in claim 1 which is dimethyl-2,2-bis-(3'',5''di-t-butyl-4-hydroxybenzyl) malonate.
Claim 9
Dependent Claim
12 words
A compound as claimed in claim 1 which is di-n-octadecyl-2, 2-bis-(3'',5''-di-t-butyl-4''-hydroxybenzyl) malonate.
Claim 10
Dependent Claim
12 words
A compound as claimed in claim 1 which is diethyl-2-butyl-2, 2-bis-(3'',5''-di-t-butyl-4-hydroxybenzyl) malonate.
Claim 11
Dependent Claim
12 words
A compound as claimed in claim 1 which is ethyl-2,2-bis-(3'', 5''-di-t-butyl-4-hydroxybenzyl) acetoacetate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |