Patent US5081258A successfully refreshed from Google Patents.
US5081258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bisbenzotriazoleureas as UV stabilizers for polymers
Assignee: Invista North America LLC
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Filing: 1989-05-05
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Granted: 1992-01-14
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Expires: 2009-05-05
Abstract
Abstract A hydroxyphenyl-benzotriazole bisurea UV light stabilizer for organic polymers and a process for making it are provided. The stabilizer is particularly useful for spandex polymer yarns that are subjected to solvent scouring. A preferred stabilizer of the invention is a bisurea formed by reacting methylene-bis(4-phenylisocyanate) with 2-[2-hydroxy-3-(1,1-dimethylethyl)-5-(N-aminoethyl)propionamid-phenyl]-2H-benzotriazole.
Inventors
- 👤 Akitsugu Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:07
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C07D249/20; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3472; C08K5/3475
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
An ultraviolet-light stabilizer for organic polymers, the stabilizer being a bisurea compound of the structural formula (I) ##STR6## wherein R denotes a divalent group which remains after removal of the two isocyanate groups of an organic diisocyanate and is selected from the group consisting of bis(p-phenylene)methane, bis(4cyclohexylene)methane, 3,3,5-trimethyl-5-methylene-cyclohexyl and tolylene, R 1 is a saturated hydrocarbon chain of 2 or 3 carbon atoms and R 2 is a 3-(2H-benzotriazol-2-yl)-4-hydroxy-5-(1,1-dimethyl)benzenepropanoyl group.
Claim 2
Dependent Claim
70 words
An ultraviolet-light stabilizer for organic polymers, the stabilizer being a bisurea compound of the structural formula (I) ##STR6## wherein R denotes a divalent group which remains after removal of the two isocyanate groups of an organic diisocyanate and is selected from the group consisting of bis(p-phenylene)methane, bis(4cyclohexylene)methane, 3,3,5-trimethyl-5-methylene-cyclohexyl and tolylene, R 1 is a saturated hydrocarbon chain of 2 or 3 carbon atoms and R 2 is a 3-(2H-benzotriazol-2-yl)-4-hydroxy-5-(1,1-dimethyl)benzenepropanoyl group.
Claim 3
Dependent Claim
16 words
A stabilizer in accordance with claim 1 wherein R is bis(p-phenylene)methane and R 1 is --CH2--CH2--.
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) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |