| (19) |
 |
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(11) |
EP 0 443 855 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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10.06.1992 Bulletin 1992/24 |
| (43) |
Date of publication A2: |
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28.08.1991 Bulletin 1991/35 |
| (22) |
Date of filing: 21.02.1991 |
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| (51) |
International Patent Classification (IPC)5: H01B 3/44 |
|
| (84) |
Designated Contracting States: |
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DE FR GB |
| (30) |
Priority: |
22.02.1990 JP 41974/90
02.08.1990 JP 205621/90
|
| (71) |
Applicant: Yamamoto, Shigeru |
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Kamakura-shi,
Kanagawa-ken (JP) |
|
| (72) |
Inventor: |
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- Yamamoto, Shigeru
Kamakura-shi,
Kanagawa-ken (JP)
|
| (74) |
Representative: Kyle, Diana et al |
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Elkington and Fife
Prospect House
8 Pembroke Road
Sevenoaks, Kent TN13 1XR
Sevenoaks, Kent TN13 1XR (GB) |
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| |
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| (54) |
Polymer material improved in its electric insulation properties |
(57) The content of spherulites of polyethylene resins is reduced by contact of the polyethylene
resin while it is molten with lithium carbonate which is in a subdivided form and
is dispersed in the molten polyethylene resin or which is in a form of a block and
is removed from the polyethylene resin after the contact. The dispersed lithium carbonate
can be removed with the reduced spherulite content preserved.