| 摘要 |
PROBLEM TO BE SOLVED: To provide a green soldering resist ink composition containing a blue colorant having transparency (brightness) and heat resistance even when mixed and used with a yellow colorant and using a colorant having neither dioxin-generating halogen nor amine-leaching azo group and to provide a printed wiring board with a coating film of the composition. SOLUTION: The soldering resist ink composition uses both a halogen-free blue colorant and a halogen-free yellow colorant, wherein heat-treated aluminum phthalocyanine blue is used as the blue colorant and a colorant having no azo group is used as the yellow colorant. |
