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US4035311A
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Electrical insulating compositions based on olefin polymers
Assignee: BASF SE
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Filing: 1976-08-23
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Granted: 1977-07-12
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Expires: 1996-08-23
Abstract
Abstract The present invention relates to electrical insulating compositions based on olefin polymers and a specific azomethine containing a naphthalene nucleus and serving to increase the long-term dielectric strength. The insulating compositions of the invention are particularly suitable for cables, especially high-tension cables.
Inventors
- 👤 Franz Feichtmayr
- 👤 Johannes Schlag
- 👤 Peter Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:51
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C; C08; C08K; C08K5/00; C08K5/16; C08K5/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
Electrical insulating compositions based on olefin polymers and containing thermally stable agents for increasing the long-term dielectric strength, wherein the said agent for increasing the longterm dielectric strength is a compound of the general formula ##STR5## where m denotes an integer of from 0 to 2, X denotes a group of the formula --CH═N--, R denotes methyl, hydroxyl, methoxy or ethoxy, R' denotes a C 2-8 -alkyl group, a cyclohexyl group or a group of the formula ##STR6## where p denotes an integer of from 0 to 4, R" denotes a C 1-6 -alkyl group or a C 1-6 -alkoxy group, provided that when p denotes an integer of from 2 to 4 the groups R" are the same or different and the total number of carbon atoms in said groups R" does not exceed 18.
Claim 2
Dependent Claim
136 words
Electrical insulating compositions based on olefin polymers and containing thermally stable agents for increasing the long-term dielectric strength, wherein the said agent for increasing the longterm dielectric strength is a compound of the general formula ##STR5## where m denotes an integer of from 0 to 2, X denotes a group of the formula --CH═N--, R denotes methyl, hydroxyl, methoxy or ethoxy, R' denotes a C 2-8 -alkyl group, a cyclohexyl group or a group of the formula ##STR6## where p denotes an integer of from 0 to 4, R" denotes a C 1-6 -alkyl group or a C 1-6 -alkoxy group, provided that when p denotes an integer of from 2 to 4 the groups R" are the same or different and the total number of carbon atoms in said groups R" does not exceed 18.
References Cited (Backward Citations)
US3674695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |