Patent ID: 8268440

Claim:
A steel plate-reinforcing material for giving vibration-damping performance to a steel plate comprising a restricted layer and a thermosetting foamed viscoelasticity layer, the thermosetting foamed viscoelasticity layer comprises tackifiers, a fiber and an inorganic filler wherein the tackifiers include a terpene resin, an aliphatic petroleum resin and an aromatic petroleum resin, and wherein the fiber is selected from the group consisting of a polyester fiber and a combination of polyester fiber and glass fiber; an amount of said fiber is from 1 to 10% by weight; and wherein the steel plate-reinforcing material has an impact resistance after preservation for 30 days at 35° C. and 85% Relative Humidity, such that no peeling, floating or aberration occurs when the material is subjected to impact from 30 mm distance at an 80° angle or greater for 1 time.