Patent ID: 7982575

Claim:
An electrical insulating member for an ignition coil including a primary coil and a secondary coil, the electrical insulating member comprising: an insulating material being a base material; and a reactive agent being an additive added to the insulating material for causing dehydration-decomposition, wherein the insulating member comprises: a high-voltage tower member connected with at least one of a primary spool, a secondary spool, a coil case, the primary spool being wound with the primary coil, the secondary spool being wound with the secondary coil, the coil case accommodating the primary coil and the secondary coil, and the high-voltage tower member accommodating a high-voltage terminal electrically conducted with a high-voltage side end of the secondary coil; and a joint member connecting the high-voltage tower member with the plug mount member, the high-voltage tower member and the joint member are formed of polyphenylene sulphide resin as the base material, a content of the reactive agent is 5 percent or greater by weight of total of the insulating member, and the reactive agent is adapted to absorb corona heat caused in the electrical insulating material and to cool the electrical insulating material.