| abstract |
(57) [Summary] (Modified) [Purpose] To provide an aqueous solution type pre-flux protective agent that forms a chemical conversion film with excellent rust resistance, heat resistance, moisture resistance and chemical resistance on the metal surface of printed wiring boards. . [Structure] A compound represented by the following formula, and a metal surface protecting agent containing the compound as an active ingredient. (In the formula, R 1 , R 2 , and R 5 are alkylene groups). R 3 , R 4 , R 6 , and R 7 represent hydrogen, a lower alkyl group, or a halogen atom. a, b, h show the integer of 0-4. c and d show the integer of 0-10. e shows the integer of 1-10. f and g represent an integer of 0 to 1. ) |