LAMINATE AND CIRCUIT BOARD

摘要

Provided are a laminate including a silver layer on a substrate, in which the silver layer includes a surface in which Kurtosis of a roughness curve satisfies at least one of Condition (i) the change rate of Kurtosis is greater than or equal to 50% under conditions of a temperature of 85° C. and a relative humidity of 85% after 240 hours have elapsed and Condition (ii) the change rate of Kurtosis is greater than or equal to 200% under conditions of a temperature of 85° C. and a relative humidity of 85% after 480 hours have elapsed, and a circuit board in which an electronic component is mounted on the surface of the laminate through a conductive joint portion.

主权项

1. A laminate, comprising:
a silver layer on a substrate, wherein the silver layer includes a surface in which Kurtosis of a roughness curve satisfies at least one of Conditions (i) and (ii) described below, (i) a change rate of Kurtosis is greater than or equal to 50% under conditions of a temperature of 85° C. and a relative humidity of 85% after 240 hours have elapsed, and (ii) a change rate of Kurtosis is greater than or equal to 200% under conditions of a temperature of 85° C. and a relative humidity of 85% after 480 hours have elapsed.