Patent ID: 8771458

Claim:
A method of making a wiring board, comprising: measuring an apparent melt viscosity of a thermotropic liquid crystal polymer of a thermotropic liquid crystal polymer film on a lot to lot basis; and if the measured apparent melt viscosity of a lot is not in the range of from 1×10 4 to 2×10 5 Pa-s at a temperature from 240 to 350° C., heat treating the thermotropic liquid crystal polymer film of the lot not in the range to adjust the apparent melt viscosity of the thermotropic liquid crystal polymer of the heat treated lot to a value in the range of from 1×10 4 to 2×10 5 Pa-s, at a temperature from 240 to 350° C.; then laminating the thermotropic liquid crystal polymer film on a wiring board material having one layer, containing an exposed electroconductive circuit; and hot pressing the thermotropic liquid crystal polymer film and the wiring board material having one layer together to provide the wiring board; wherein a temperature of the hot pressing is a temperature in the range from 240 to 350° C., and the apparent melt viscosity is measured at a frequency of 1 Hz.