US 5,683,627 AGranted

Curable electroconductive composition

AssigneeTokuyama Corporation

InventorsToshihiro Katayama, Tomomi Okamoto, Toshitsugu Shimamoto

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Abstract

A curable electroconductive composition which comprises (1)(a) a monoglycidyl compound such as cardanolglycidyl ether having 18 to 30 carbon atoms and further having in a molecule thereof an epoxy group, one or more aromatic hydrocarbon groups and an aliphatic hydrocarbon group having 6 to 20 carbon atoms and (b) a crosslinking component such as bisphenol A diglycidyl ether having in a molecule thereof two or more epoxy groups and one or more aromatic hydrocarbon groups, (2) a curing agent, and (3) a copper powder. The curable electroconductive composition does not develop cracks during the curing even when thick electrically conducting cured products are formed such as electrically conducting through-holes in printed wiring board, and the cured product thereof exhibits stable electrically conducting property over extended periods of time.

Claims17

Dependent claims

A curable electroconductive composition which comprises:

(1) an epoxy resin containing (a) a monoglycidyl compound having 18 to 30 carbon atoms and further having in a molecule thereof an epoxy group, one or more aromatic hydrocarbon groups and an aliphatic hydrocarbon group having 6 to 20 carbon atoms, and (b) a crosslinking component having in a molecule thereof two or more epoxy groups and one or more aromatic hydrocarbon groups, the amount of the monoglycidyl compound being from 5 to 60 parts by weight per 100 parts by weight of the crosslinking component;
(2) a curing agent having a reactive group capable of reacting with said epoxy groups in said epoxy resin;
and
(3) a copper powder;
wherein said curing agent is blended in an amount of from 0.3 to 1.3 equivalents per equivalent of the epoxy groups in said epoxy resin as expressed in terms of the equivalents of the reactive groups capable of reacting with said epoxy groups in said epoxy resin, and said copper powder is blended in an amount of from 180 to 750 parts by weight per 100 parts by weight of a total of said epoxy resin and said curing agent.

2 more elements

Dependencies are inferred from the claim text.