US4369274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hindered amine light stabilizers for polymers
Assignee: Wyeth Holdings LLC
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Filing: 1981-07-20
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Granted: 1983-01-18
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Expires: 2001-07-20
Abstract
Abstract Compounds of the formula ##STR1## and polymers thereof are useful as ultraviolet radiation stabilizers for polymers.
Inventors
- 👤 Walter M. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3435; C07; C07D; C07D211/00; C07D211/04; C07D211/06; C07D211/36; C07D211/60; C07D211/62; C07D211/66; C07D211/92; C07D211/94; C08F; C08F26/00; C08F26/02; C08F26/04; C08F26/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
A compound of the formula (I) ##STR7## wherein R 1 represents hydrogen, or C 1 -C 4 alkyl; R 2 represents hydrogen, hydroxy, or C 1 -C 8 alkoxy; R 3 represents hydrogen, C 1 -C 8 alkyl, or benzyl; R 4 and R 5 independently represent C 1 -C 8 alkyl, benzyl, or phenethyl, or together with the carbon to which they are attached form a C 5 -C 10 cycloalkyl; and, R 6 represents hydrogen, C 2 -C 3 hydroxyalkyl, C 1 -C 8 alkyl, hydroxy, or oxyl.
Claim 2
Dependent Claim
90 words
A compound of the formula (I) ##STR7## wherein R 1 represents hydrogen, or C 1 -C 4 alkyl; R 2 represents hydrogen, hydroxy, or C 1 -C 8 alkoxy; R 3 represents hydrogen, C 1 -C 8 alkyl, or benzyl; R 4 and R 5 independently represent C 1 -C 8 alkyl, benzyl, or phenethyl, or together with the carbon to which they are attached form a C 5 -C 10 cycloalkyl; and, R 6 represents hydrogen, C 2 -C 3 hydroxyalkyl, C 1 -C 8 alkyl, hydroxy, or oxyl.
Claim 3
Dependent Claim
19 words
The compound of claim 1 wherein R 3 is hydrogen and R 4 and R 5 are each methyl.
Claim 4
Dependent Claim
32 words
The compound of claim 1 wherein R 1 , R 2 , and R 3 are hydrogen; R 4 and R 5 are each methyl; and R 6 is hydrogen or methyl.
Claim 5
Dependent Claim
11 words
A homopolymer of the compound of claim 1, 2 or 3.
Claim 6
Dependent Claim
18 words
A copolymer comprising the compound of claim 1, 2 or 3 and copolymerized therewith, an ethylenically unsaturated monomer.
Claim 7
Dependent Claim
37 words
A method of stabilizing a polymer which is normally subject to degradation by ultraviolet radiation which comprises incorporating into said polymer an ultraviolet stabilizingly effective amount of a compound or polymer of a compound of claim 1.
Claim 8
Dependent Claim
26 words
The method of claim 6 wherein the stabilizer is incorporated in a concentration of from about 0.2% to 2% based on the weight of the polymer.
Claim 9
Dependent Claim
13 words
The method of claim 6 wherein the polymer being stabilized is a polyolefin.
Claim 10
Dependent Claim
10 words
The method of claim 8 wherein the polyolefin is polypropylene.
Claim 11
Dependent Claim
25 words
The method of claim 6 wherein the stabilizer compound or polymer thereof, R 3 is hydrogen and R 4 and R 5 are each methyl.
Claim 12
Dependent Claim
9 words
The composition produced by the method of claim 6.
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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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |