发明名称 |
Method for improving impulse breakdown strength of electrical insulating materials. |
摘要 |
<p>The present invention provides a method for improving the impulse breakdown strength of an electrically insulating material which is characterized by employing, as the electrical insulating material, a copolymer of a styrene series monomer and ethylene or a combination of ethylene and another ethylenically unsaturated monomer, or a composition in which the copolymer is blended with an ethylene series polymer, the copolymer being prepared by introducing, into a reaction system, the styrene series monomer selected from the group of styrene and single-ring substituted styrenes, ethylene or the combination of ethylene and the ethylenic unsaturated monomer and a polymerization initiator, the latter being introduced thereinto separately from at least the styrene series monomer, and subjecting these monomers to a high-pressure radical copolymerization under a polymerization pressure of 500 to 4,000 kg/cm<Sup>2</Sup> at a polymerization temperature of 50 to 400°C, the aforesaid polymer or composition satisfying the following (a) and (b):
<UnorderedLists id="ula01" listStyle="none"><ListItem>(a) the content of the styrene series monomer in the copolymer or the composition being within the range of 0.01 to 1 mol%; and</ListItem><ListItem>(b) the crystallinity of the copolymer or the composition being 30% or more in accordance with X-ray diffraction.</ListItem></UnorderedLists></p> |
申请公布号 |
EP0180797(A2) |
申请公布日期 |
1986.05.14 |
申请号 |
EP19850112789 |
申请日期 |
1985.10.09 |
申请人 |
NIPPON PETROCHEMICALS COMPANY, LIMITED |
发明人 |
ORIKASA, YUICHI;KOJIMA, SHINJI;INOUE, TAKASHI;YAMAMOTO, KAORU;SATO, ATSUSHI;KAWAKAMI, SHIGENOBU |
分类号 |
C08L23/00;C08F210/02;C08L7/00;C08L21/00;C08L23/04;C08L33/00;C08L33/02;C08L101/00;H01B3/44;(IPC1-7):H01B3/44 |
主分类号 |
C08L23/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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