Patent US4360675A successfully refreshed from Google Patents.
US4360675A
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Homopolymers and copolymers of vinyl ethers of polyalkylpiperidinols and their use as stabilizers for plastics
Assignee: Novartis Corp
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Filing: 1981-10-15
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Granted: 1982-11-23
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Expires: 2001-10-15
Abstract
Abstract Homopolymers and copolymers of vinyl ethers of the formula I <IMAGE> (I) in which R is hydrogen or methyl and R1 is hydrogen C1-C8-alkyl, benzyl, allyl or C1-C2-acyl, are effective stabilizers for plastics, especially to protect them against photochemical degradation. The monomeric vinyl ethers of the formula I are novel compounds, which can be prepared from the corresponding piperidinols by vinylation by means of acetylene or by transvinylation by means of vinyl ethers or vinyl esters.
Inventors
- 👤 Erwin Nikles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:54
CPC Classifications
C; C08; C08F; C08F16/00; C08F16/12; C08F16/14; C08F16/28; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/40; C07D211/44; C07D211/46; C08L; C08L101/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A vinyl ether of the formula I ##STR3## in which R is hydrogen or CH 3 and R 1 is hydrogen, C 1 -C 8 -alkyl, benzyl, allyl, formyl or acetyl.
Claim 2
Dependent Claim
31 words
A vinyl ether of the formula I ##STR3## in which R is hydrogen or CH 3 and R 1 is hydrogen, C 1 -C 8 -alkyl, benzyl, allyl, formyl or acetyl.
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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |