Patent US3897388A successfully refreshed from Google Patents.
US3897388A
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US
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Antioxidant comprising a hydroxy aromatic compound containing sulfur and organic phosphite
Assignee: Raychem Corp
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Filing: 1973-10-11
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Granted: 1975-07-29
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Expires: 1993-10-11
Abstract
Abstract An improved antioxidant composition, especially suitable for irradiated or fire-retardant plastics, comprising a mixture of a hydroxy aromatic compound containing sulfur and organic phosphite compounds.
Inventors
- 👤 Bernard J Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:58
CPC Classifications
C; C08; C08L; C08L101/00; C08K; C08K5/00; C08K5/36; C08K5/49; C08K5/51; C08K5/52; C08L85/00; C08L85/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
AN ANTIOXIDANT COMPOSITION SUITABLE FOR USE WITH POLYMERS SUBJECT TO OXIDATE DEGRADATION, ESPECIALLY IRRADIATED AND FIRE RETARDANT PLASTICS, COMPRISING A MIXTURE OF HYDROXY AROMATIC COMPOUNDS CONTAINING SULFUR SELECTED FROM THE GROUP CONSISTING OF OLIGOMERS OF 4,4''-THIOBIS (6-T-BUUTYL-MCRESOL) OR THE REACTION PRODUCT OF PHOSPHORUS OXYCHLORIDE AND 4,4'' THIOBIS (6-T-BUTYL-M-CRESOL) AND AN ORGANIC PHOSPHITE COMPOUND OF THE GENERAL FORMUL (ROP(OR'')2)NPR,WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, SUBSTITUTED ALKYL, ARYL AND SUBSTITUTED ARYL AND R'' IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL,SUBSTITUTED ALKYL, ARYL AND SUBSTITUTED ARYL WHEREIN N ISAN INTEGER FROM 1 TO 3 AND X IS 0 OR 1.
Claim 2
Dependent Claim
103 words
AN ANTIOXIDANT COMPOSITION SUITABLE FOR USE WITH POLYMERS SUBJECT TO OXIDATE DEGRADATION, ESPECIALLY IRRADIATED AND FIRE RETARDANT PLASTICS, COMPRISING A MIXTURE OF HYDROXY AROMATIC COMPOUNDS CONTAINING SULFUR SELECTED FROM THE GROUP CONSISTING OF OLIGOMERS OF 4,4''-THIOBIS (6-T-BUUTYL-MCRESOL) OR THE REACTION PRODUCT OF PHOSPHORUS OXYCHLORIDE AND 4,4'' THIOBIS (6-T-BUTYL-M-CRESOL) AND AN ORGANIC PHOSPHITE COMPOUND OF THE GENERAL FORMUL (ROP(OR'')2)NPR,WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, SUBSTITUTED ALKYL, ARYL AND SUBSTITUTED ARYL AND R'' IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL,SUBSTITUTED ALKYL, ARYL AND SUBSTITUTED ARYL WHEREIN N ISAN INTEGER FROM 1 TO 3 AND X IS 0 OR 1.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein at least one OR or OR'' is a derivative of pentaerythritol.
Claim 4
Dependent Claim
11 words
The composition of claim 1 wherein the organic phosphite is distearylpentaerylthitoldiphosphite.
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein the organic phosphite is diisodecyl pentaerythritol diphosphite.
Claim 6
Dependent Claim
12 words
The composition of claim 1 wherein the organic phosphite has the formula:
Claim 7
Dependent Claim
17 words
The composition of claim 1 wherein the organic phosphite is a polymeric phosphite of the general formula:
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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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |