US4458044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulation II
Assignee: Siemens AG
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Filing: 1983-01-27
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Granted: 1984-07-03
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Expires: 2003-01-27
Abstract
Abstract The invention relates to electrical insulation material of a polyolefin composition containing an additive which prevents the formation of so-called water trees. Barbituric acid compounds are the additives and include barbituric acid, 2-thiobarbituric acid or substituted barbituric or thiobarbituric acid derivatives. The electrical insulation according to the invention is suited particularly for use in cables and wires.
Inventors
- 👤 Hans-Joachim Henkel
- 👤 Norbert Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:36
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462; C08K5/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
An electrical insulation material with an additive for preventing the formation of water trees, which comprises: a polyolefin composition with a barbituric acid compound additive selected from barbituric acid, 2-thiobarbituric acid or a barbituric acid derivative having the formula: ##STR2## wherein: X is oxygen or sulfur, R is hydrogen or alkyl, and R 1 and R 2 are each independently selected from hydrogen, alkyl alkenyl, cycloalkyl, cycloalkenyl or aryl.
Claim 2
Dependent Claim
69 words
An electrical insulation material with an additive for preventing the formation of water trees, which comprises: a polyolefin composition with a barbituric acid compound additive selected from barbituric acid, 2-thiobarbituric acid or a barbituric acid derivative having the formula: ##STR2## wherein: X is oxygen or sulfur, R is hydrogen or alkyl, and R 1 and R 2 are each independently selected from hydrogen, alkyl alkenyl, cycloalkyl, cycloalkenyl or aryl.
Claim 3
Dependent Claim
28 words
An electrical insulation material according to claim 1, wherein the additive content is approximately between 0.5 and 5% by weight, relative to the total weight of the invention.
Claim 4
Dependent Claim
22 words
An electrical insulation material according to claim 1, wherein the additive is 5-stearyl barbituric acid, barbital, allobarbital, phenobarbital, cyclobarbital, methylphenobarbital or hexobarbital.
Claim 5
Dependent Claim
24 words
An electrical insulation material according to claim 1, which is used to insulate cable or wire carrying a voltage greater than about 10 kV.
References Cited (Backward Citations)
US4185007A
Cited
US4282333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |