US3723405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for bonding antioxidants to polymer films
Assignee: AT&T Inc
•
Filing: 1972-04-10
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Granted: 1973-03-27
•
Expires: 1992-04-10
Abstract
Abstract A technique is described for stabilizing polyolefins against degradation attributed to thermal oxidation. The described technique involves bonding a carbene, obtained by the decomposition of 3,5-ditertiarybutylbenzene-1,4-diazooxide, to the alpha olefin.
Inventors
- 👤 M Kaplan
- 👤 P Kelleher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:58
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
Technique in accordance with claim 1 wherein said decomposition is effected by heating the diazooxidepolyolefin mixture to a temperature within the range of 310* - 150* C for a time period ranging from 1 - 2 minutes.
Claim 2
Dependent Claim
33 words
Technique in accordance with claim 1 wherein said decomposition is effected by exposing the polyolefin in contact with the diazooxide to a source of visible light having a wavelength greater than 3,000 A.
Claim 3
Dependent Claim
11 words
Technique in accordance with claim 2 wherein said polyolefin is polyethylene.
Claim 4
Dependent Claim
15 words
Technique in accordance with claim 4 wherein said polyethylene has a density of 0.92 g/cm3.
Claim 5
Dependent Claim
22 words
Stabilized composition of matter comprising a poly alpha olefin having a carbene bonded thereto, said carbene being the decomposition product of 3,5-ditertiarybutylbenzene-1,4-diazooxide.
Claim 6
Dependent Claim
13 words
Composition in accordance with claim 6 wherein said poly alpha olefin is polyethylene.
Claim 7
Dependent Claim
16 words
Composition in accordance with claim 7 wherein said poly alpha olefin is low density branched polyethylene.
References Cited (Backward Citations)
US3658755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |