| 摘要 |
PURPOSE:To obtain an electrically conductive paste having excellent adhesion, flexibility and electrical conductivity stability and a high curing rate, by blending a urethane prepolymer contg. no unsaturated double bond, a polyhydric alcohol and an electrically conductive powder. CONSTITUTION:An electrically conductive paste contains a urethane prepolymer contg. no unsaturated double bond, a polyhydric alcohol contg. no unsaturated double bond and an electrically conductive powder. The urethane prepolymer contg. no unsaturated double bond is one wherein terminal active isocyanate groups are blocked with an active hydrogen-contg. compd. The ratio (NCO/OH) of the isocyanate group released from the urethane prepolymer to the hydroxyl group in said polyhydric alcohol is in the range of 1.0-1.2 equivalents. As the urethane prepolymer, those wherein terminal active isocyanate groups are blocked with an active hydrogen-contg. compd. are preferred.
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