US4880854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enhancing color stability to sterilizing radiation of polymer compositions
Assignee: General Electric Co
•
Filing: 1987-12-22
•
Granted: 1989-11-14
•
Expires: 2007-12-22
Abstract
Abstract Compounds having defined triazine functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.
Inventors
- 👤 Roger W. Avakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:56
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K5/00; C08K5/0008; C08K5/005; C08L69/00; C08L69/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
An medical article sufficiently radiated to achieve sterilization, said article comprising an extruded admixture of (a) an aromatic carbonate polymer and (b) an effective amount of a stabilizing compound to inhibit yellowing upon sterilizing radiation exposure, where said compound is tetrakis(methylene(3,5-di-t-butyl-4-hydroxy-hydrocinnamate)methane.
Claim 2
Dependent Claim
41 words
An medical article sufficiently radiated to achieve sterilization, said article comprising an extruded admixture of (a) an aromatic carbonate polymer and (b) an effective amount of a stabilizing compound to inhibit yellowing upon sterilizing radiation exposure, where said compound is tetrakis(methylene(3,5-di-t-butyl-4-hydroxy-hydrocinnamate)methane.
Claim 3
Dependent Claim
14 words
The article of claim 1 wherein said aromatic polycarbonate polymer is a poly(bisphenol-A) carbonate.
Claim 4
Dependent Claim
13 words
The article of claim 1 wherein said aromatic carbonate polymer is a poly(ester-carbonate).
Claim 5
Dependent Claim
11 words
The article of claim 1 which further comprises a polyester resin.
Claim 6
Dependent Claim
17 words
The article of claim 1 which contains 0.01-5.0 weight parts stabilizing compound per 100 weight parts polymer.
Claim 7
Dependent Claim
17 words
The article of claim 1 which contains 0.01-0.50 weight parts stabilizing compound per 100 weight parts polymer.
Claim 8
Dependent Claim
11 words
The article of claim 1 which further comprises a polyestercarbonate resin.
Claim 9
Dependent Claim
48 words
A medical article sufficiently radiated to achieve sterilization, said article comprising an extruded admixture of (a) an aromatic carbonate polymer and (b) an effective amount of a stabilizing compound to inhibit yellowing upon sterilizing radiation exposure, wherein said compound formed from esterifying 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid tri ester with 1,3,5-tris(2-hydroxy-ethyl)-s-triazine-2,4,6(1H,3H,5H)-trione.
Claim 10
Dependent Claim
48 words
A medical article sufficiently radiated to achieve sterilization, said article comprising an extruded admixture of (a) an aromatic carbonate polymer and (b) an effective amount of a stabilizing compound to inhibit yellowing upon sterilizing radiation exposure, wherein said compound formed from esterifying 3,5-di-tert-butyl-4-hydroxyhydrocinnamic acid tri ester with 1,3,5-tris(2-hydroxy-ethyl)-s-triazine-2,4,6(1H,3H,5H)-trione.
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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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |