US4581290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulation I
Assignee: Siemens AG
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Filing: 1984-12-12
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Granted: 1986-04-08
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Expires: 2004-12-12
Abstract
Abstract The invention relates to electrical insulation material of a polyolefin composition with a phosphate additive which prevents the formation of so-called water trees. The phosphate additive may be a water-soluble alkali or earth-alkali phosphate and/or a hydrolysable phosphoric acid ester (RO)3PO, wherein at least one of the substituents R is an aliphatic radical and the remaining substituents may be hydrogen or an aliphatic radical. 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 05:01
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C; C08; C08K; C08K3/00; C08K3/32; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
An insulated electrical conductor comprising: an electrically conducting metal and an electrically insulating polyolefin composition covering the metal, the composition containing a phosphate additive selected from the group consisting of from about 1% to about 10% by weight, relative to the weight of the composition, of water-soluble alkali or earth-alkali phosphates, from about 0.1% to about 5% by weight, relative to the weight of the composition, of a hydrolysable phosphoric acid ester of the formula (RO) 3 PO and a combination thereof, wherein R is hydrogen or an alkyl radical, provided that at least one R group is always an alkyl radical, and provided that no co-crosslinking phosphoric ester and no inorganic ammonium salts are present; said phosphate additive acting upon said polyolefin composition to prevent the formation of water trees when the conductor is dielectrically stressed by the presence of an electric field.
Claim 2
Dependent Claim
144 words
An insulated electrical conductor comprising: an electrically conducting metal and an electrically insulating polyolefin composition covering the metal, the composition containing a phosphate additive selected from the group consisting of from about 1% to about 10% by weight, relative to the weight of the composition, of water-soluble alkali or earth-alkali phosphates, from about 0.1% to about 5% by weight, relative to the weight of the composition, of a hydrolysable phosphoric acid ester of the formula (RO) 3 PO and a combination thereof, wherein R is hydrogen or an alkyl radical, provided that at least one R group is always an alkyl radical, and provided that no co-crosslinking phosphoric ester and no inorganic ammonium salts are present; said phosphate additive acting upon said polyolefin composition to prevent the formation of water trees when the conductor is dielectrically stressed by the presence of an electric field.
Claim 3
Dependent Claim
15 words
A conductor according to claim 1, wherein the phosphate additive is present in water-free form.
Claim 4
Dependent Claim
14 words
A conductor according to claim 1, wherein the phosphate additive is a sodium phosphate.
Claim 5
Dependent Claim
16 words
A conductor according to claim 1 wherein the additive is a water-soluble alkali or earth-alkali phosphate.
References Cited (Backward Citations)
US3974132A
Cited
JPS5245647A
Cited
US4206260A
Cited
US4198310A
Cited
US4219607A
Cited
US4223071A
Cited
US4325850A
Cited
GB2057454A
Cited
US4337188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |