US3627728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaryl-p-phenylenediamine stabilizers for peroxide-cured polyethylene
Assignee: EIDP Inc
•
Filing: 1968-12-04
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Granted: 1971-12-14
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Expires: 1988-12-04
Abstract
Abstract In a process for producing cross-linked polyethylene by (1) mixing polyethylene with 1 to 10 parts of a tertiary organic peroxide and (2) heating the mixture to effect cross-linking, the improvement of adding to the mixture before the cross-linking step about from 0.25 to 2 parts of a stabilizer which is an N,N''diaryl-p-phenylenediamine, all parts being by weight per 100 parts of polyethylene. A preferred diamine stabilizer weightper is that prepared by condensing 1 mole of hydroquinone with at least 2 moles of an amine mixture consisting of 75 to 90 percent by weight of o-toluidine and 25 to 10 percent by weight of technical mixed xylidines.
Inventors
- 👤 Antonio H Fernandes
- 👤 Charles E Mccormack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:30
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08K5/16; C08K5/17; C08K5/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3247161A
Cited
US3238176A
Cited
US3507826A
Cited
US3296189A
Cited
US3513124A
Cited
US3432460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |