content_image/880163.jpg content_image/880164.jpg content_image/880165.jpg
water-drop test is 10 m A or less. 

[0060] Incidentally, KE-311 (rosin ester: manufactured by ARAKAWA CHEMICAL INDUSTRIES, LTD.) is considered to be composed of an ester of hydrogenated rosin and glycerin represented by the following Structural Formulas (4) to (7). It could be confirmed that, in the case of using KE-311 alone, the current value in the water-drop test becomes higher, and the occurrence of migration cannot be suppressed (Comparative Example 4). 

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Formula (7) 

