US4265805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric light stabilizers containing tetralkyl piperidine moieties
Assignee: Wyeth Holdings LLC
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Filing: 1980-04-01
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Granted: 1981-05-05
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Expires: 2000-04-01
Abstract
Abstract Polymeric polyesters containing a 2,2,6,6-tetralkyl piperidine moiety in the repeating unit are disclosed as light stabilizers for polymers subject to degradation by ultra-violet light.
Inventors
- 👤 Richard W. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:20
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6852; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/60; C07D211/62; C08L; C08L101/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
100 words
A polymer of the formula ##STR6## wherein R 1 is alkylene (C 2 -C 8 ) or cycloalkylene (C 5 -C 6 ); R 2 and R 3 are each alkyl (C 1 -C 8 ) or together with the carbon to which they are attached form a cycloalkyl ring having 5 or 6 carbon atoms; R 4 is hydrogen, hydroxyl, alkoxy (C 1 -C 8 ), or acyloxy (C 1 -C 8 ); R 5 is alkyl (C 1 -C 8 ) or cycloalkyl (C 5 -C 6 ); and, x is an integer from 4 to about 10.
Claim 2
Dependent Claim
100 words
A polymer of the formula ##STR6## wherein R 1 is alkylene (C 2 -C 8 ) or cycloalkylene (C 5 -C 6 ); R 2 and R 3 are each alkyl (C 1 -C 8 ) or together with the carbon to which they are attached form a cycloalkyl ring having 5 or 6 carbon atoms; R 4 is hydrogen, hydroxyl, alkoxy (C 1 -C 8 ), or acyloxy (C 1 -C 8 ); R 5 is alkyl (C 1 -C 8 ) or cycloalkyl (C 5 -C 6 ); and, x is an integer from 4 to about 10.
Claim 3
Dependent Claim
54 words
The polymer of claim 1 wherein R 1 is alkylene (C 2 -C 4 ), R 2 and R 3 are each alkyl (C 1 -C 4 ), R 4 is hydrogen hydroxyl or alkoxy (C 1 -C 4 ), R 5 is alkyl (C 1 -C 3 ), and x is about 6-8.
Claim 4
Dependent Claim
14 words
The polymer of claim 1 wherein R 2 and R 3 are each methyl.
Claim 5
Dependent Claim
10 words
The polymer of claim 3 wherein R 4 is hydroxyl.
Claim 6
Dependent Claim
26 words
The polymer of claim 1 wherein R 1 is ethylene, R 2 and R 3 are methyl, R 4 is hydroxyl, and R 5 is methyl.
Claim 7
Dependent Claim
24 words
A composition comprising a polymer normally subject to degradation by ultraviolet light and an ultraviolet stabilizingly effective amount of a polymer of claim 1.
Claim 8
Dependent Claim
48 words
The composition of claim 6 wherein R 1 is alkylene (C 2 -C 4 ), R 2 and R 3 are each alkyl (C 1 -C 4 ), R 4 is hydrogen or hydroxyl, R 5 is alkyl (C 1 -C 3 ) and x is about 10.
Claim 9
Dependent Claim
14 words
The composition of claim 7 wherein R 2 and R 3 are each methyl.
Claim 10
Dependent Claim
10 words
The composition of claim 8 wherein R 4 is hydroxyl.
Claim 11
Dependent Claim
26 words
The composition of claim 6 wherein R 1 is ethylene, R 2 and R 3 are methyl, R 4 is hydroxyl and R 5 is methyl.
Claim 12
Dependent Claim
27 words
The composition of claim 6 wherein said effective amount is about 0.01% to about 5% by weight of said stabilizer based on the weight of said polymer.
Claim 13
Dependent Claim
11 words
The composition of claim 6 wherein said polymer is a polyolefin.
Claim 14
Dependent Claim
10 words
The composition of claim 12 wherein said polyolefin is polypropylene.
Claim 15
Dependent Claim
26 words
The composition of claim 6, wherein said polymer is selected from the group consisting of polyethylene, a copolymer of ethylene and propylene, and an aromatic polyurethane.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |