Patent US4340533A successfully refreshed from Google Patents.
US4340533A
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Novel stabilizers
Assignee: Sankyo Co Ltd
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Filing: 1980-09-29
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Granted: 1982-07-20
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Expires: 2000-09-29
Abstract
Abstract 2,2,6,6-Tetramethylpiperidine derivatives of the formula: ##STR1## wherein m is 0, 1 or 2, R 1 is hydrogen, methyl, ethyl, phenoxymethyl or phenyl and R 2 is C1-C8 alkyl, are excellent stabilizers for synthetic polymers.
Inventors
- 👤 Jean Rody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:30
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/46; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
2,2,6,6-Tetramethylpiperidine derivatives having the formula ##STR4## wherein m is 0, 1 or 2, R 1 is hydrogen, methyl, ethyl, phenoxymethyl or phenyl, and R 2 is C 1 -C 8 alkyl.
Claim 2
Dependent Claim
31 words
2,2,6,6-Tetramethylpiperidine derivatives having the formula ##STR4## wherein m is 0, 1 or 2, R 1 is hydrogen, methyl, ethyl, phenoxymethyl or phenyl, and R 2 is C 1 -C 8 alkyl.
Claim 3
Dependent Claim
9 words
A compound as claimed in claim 1 being 1-{2-[3-(3,5-di-tert.-butyl-4-hydroxy-phenyl)-propionyloxy]-ethyl}-4-[3-(3,5-di-tert.-butyl-4-hydroxy-phenyl)-propionyloxy]-2,2,6,6-tetramethyl-piperidine.
Claim 4
Dependent Claim
15 words
Stabilized synthetic polymer compositions containing a 2,2,6,6-tetramethylpiperidine derivative as defined in claim 1 or 2.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |