Claims
- 1. An insulated electrical conductor comprising an electrically conducting material in combination with an electrically insulating polyolefin composition containing in a homogeneous distribution 0.1 to 4 percent by weight, relative to the total weight of the composition, of an inorganic oxide additive selected from silica, aluminum oxide, aluminum oxide hydrate or aluminum silicate which is absorption-active for heavy metal ions or which binds heavy metal ions in an ion exchange, and which has a particle size of up to 50 microns or an agglomerate size of up to 100 microns, said additive acting upon said polyolefin composition to prevent the formation of water trees when said composition is dielectrically stressed by the presence of an electric field.
- 2. An insulated electrical conductor according to claim 1 wherein the additive is pyrogenic and/or precipitated silica.
- 3. An insulated electrical conductor according to claim 1 wherein the additive is an aluminum oxide or an aluminum oxide hydrate with a large active surface or an aluminum silicate.
- 4. An insulated electrical conductor according to claim 2 wherein the additive is prepared synthetically.
- 5. An insulated electrical conductor according to claim 1 wherein the content of the additive is about 0.5 to 2 percent by weight.
- 6. An insulated electrical conductor according to claim 1 wherein the particle size of the additive is up to 20 um.
- 7. An insulated electrical conductor according to claim 3 wherein the additive is prepared synthetically.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3318988 |
May 1983 |
DEX |
|
Parent Case Info
This application is a continuation of application Ser. No. 613,642 filed May 24, 1984, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (15)
Number |
Date |
Country |
0027300 |
Apr 1981 |
EPX |
2425760 |
Jan 1975 |
DEX |
2523844 |
Dec 1976 |
DEX |
2537283 |
Mar 1977 |
DEX |
2817801 |
Sep 1978 |
DEX |
2754336 |
Jul 1979 |
DEX |
2805875 |
Aug 1979 |
DEX |
2806752 |
Aug 1979 |
DEX |
2911756 |
Oct 1980 |
DEX |
2935224 |
Mar 1981 |
DEX |
2213954 |
Aug 1974 |
FRX |
729669 |
May 1955 |
GBX |
808286 |
Feb 1959 |
GBX |
822498 |
Oct 1959 |
GBX |
1443461 |
Jul 1976 |
GBX |
Non-Patent Literature Citations (1)
Entry |
von Wanswer et al., Kabelisolierungen aus Kunststoff, Kunststoffe 71 (1981) pp. 448-453. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
613642 |
May 1984 |
|