To get rid of defects of ordinary vibration damping steel sheets, studies were caned out to improve weldability and thermo-endurance in the baking temperature of cosmetic coatings. It has been shown that weldability can be obtained by adding to the resin layer conductive metal particles by 5 to 40 wt % to the resin layer. The diameter (δ) of Metal particle must satisfy the following equation, with regard to the thickness of the resin layer (T) : T/δ= 1.0 1.2 In addition, new thermosetting resins with both good vibration capability and good thermo-endurance have been developed by using the bridging reaction of curring agents between moleculas of the thermoplastic polyester resin. Based on these new findings, a new manufacturing process of coiled products of conductible vibration damping steel sheets has been established.
