C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
334/22, 334/28,
C25D 13/06 (2006.01) C25D 13/12 (2006.01) H01G 4/12 (2006.01) H01G 4/14 (2006.01) H01G 4/38 (2006.01) H01L 41/083 (2006.01) H05K 1/00 (2006.01) H05K 1/02 (2006.01) H05K 1/03 (2006.01)
Patent
CA 2020367
ABSTRACT OF THE DISCLOSURE A multi-layered ceramic element which comprises a plurality of films or thin plates of ceramic and a plurality of inner electrodes which are alternatively arranged in layers, wherein the ends of the inner electrodes are exposed at side end faces of the multi-layered assembly and only the exposed portions of the inner electrodes and the ceramic surface in the vicinity of the exposed portions of the electrodes are covered with an insulating layer which comprises a polyimide resin having repeating units represented by the following general formula (I): Image ( I ) wherein X represents a tetravalent group selected from the group consisting of tetravalent phenyl groups; tetravalent biphenyl groups; and tetravalent polyphenyl and polybiphenyl groups in which at least one of either the phenyl groups or biphenyl groups are bonded through at least one member selected from the group consisting of O, CO, S, SO2, CH2, C(CH3)2 and C(CF3)2 and Y represents a bivalent group selected from the group consisting of phenylene groups; biphenylene groups; bivalent polyphenyl and polybiphenyl groups in which at least one pf either the phenyl groups or biphenyl groups are bonded through at least one member selected from the group consisting of 0, CO, S, SO2, CH2, C(CH3)2 and C(CF3)2; alkylene groups; and xylylene groups and optionally an insulating filler, as well as a method for producing the multi-layered ceramic element.
Hagimura Atsushi
Inage Ikuo
Nakajima Mutsuo
Nishihara Kunio
Fetherstonhaugh & Co.
Hagimura Atsushi
Inage Ikuo
Mitsui Toatsu Chemicals Inc.
Nakajima Mutsuo
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