| 摘要 |
PURPOSE:To obtain the subject coating, containing metallic gold powder, a specific resol type phenolic resin, a saturated or an unsaturated fatty acid (metallic salt thereof) and carbon black, having good electric conductivity, and excellent in adhesion of films onto insulating substrates, solderability, etc. CONSTITUTION:A coating which is a paste for forming piezoelectric buzzer electrodes is obtained by blending (A) 100pts.wt. mixture composed of (i) 85-96wt.% metallic gold powder and (ii) 15-4wt.% resol type phenolic resin establishing the relations between respective transmittances of (l/n) = 0.8-1.2, (m/n) = 0.8-1.2, (b/a) = 0.8-1.2 and (c/a) = 1.2-1.5 when the infrared transmittances of a 2-monosubstitution product, a 2,4-disubstitution product, a 2,4,6-trisubstitution product, methylol group, dimethylene ether and phenyl group measured by infrared spectroscopy are (l), (m), (n), (a), (b) and (c) with (B) 0.1-8pts.wt. (un)saturated fatty acid (metallic salt thereof) and (C) carbon black. |
