US3822225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of elastomer stabilization and products therefrom
Assignee: Westvaco Corp
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Filing: 1972-09-14
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Granted: 1974-07-02
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Expires: 1992-09-14
Abstract
Abstract STABILIZING COMPOSITIONS COMPRISING AT LEAST ONE TRIARYL PHOSPHITE, TRIALKYL PHOSPHITE OR MIXTURES THEREOF AND AT LEAST ONE MODIFIED LIGNIN, THE WEIGHT RATIO OF THE PHOSPHITE TO MODIFIED LIGNIN IS FROM 97/3 TO 10/90. THE MODIFIED LIGNINS ARE PRODUCED BY HEAT TREATING LIGNINS IN THE PRESENCE OF A NUCLEOPHILE, SUCH THAT A PORTION OF THE ORIGINAL GUAICYL STRUCTURES ARE CONVERTED TO CATHECHOLS VIA A DEMETHYLATION REACTION. ELASTOMERS MAY BE PROTECTED AGAINST ATMOSPHERIC DEGRADATION BY THE ADDITION THERETO OF 0.01 TO 5.0 PARTS BY WEIGHT, PERFERABLY 0.25 TO 2.0 PARTS, PER 100 PARTS OF ELASTOMER OF THE STABILIZING COMPOSITION.
Inventors
- 👤 D Braddon
- 👤 S Falkehag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:34
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524; C08L; C08L21/00; C08L21/02; C08L7/00; C08L9/00; C08L9/06; C08L9/08; C08L97/00; C08L97/005; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |