The same procedures as in Example 12 were conducted except that a 0.2% by weight aqueous solution of the benzoimidazole compound represented by formula (4), wherein R6 was C8 H17 and R7 was a hydrogen atom, was used, and that a TAB (tape automated bonding) which had been pretreated with an aqueous hydrochloric acid solution and had a pitch of 0.25 mm was used.