Patent ID: 8017533

Claim:
A steel plate reinforcing sheet comprising: a restricting layer and a reinforcing layer, wherein the reinforcing layer comprises a foam composition comprising: a rubber comprising a styrene butadiene random copolymer, an aromatic epoxy resin, a foaming agent, a rubber cross-linking agent comprising sulfur, a tackifier, and an epoxy resin curing agent; wherein the foam composition comprises about 30 to about 70 parts by weight of the rubber and about 70 to about 30 parts by weight of aromatic epoxy resin per 100 parts by weight of total of the rubber and aromatic epoxy resin, about 1 to about 20 parts by weight of sulfur and about 10 to about 200 parts by weight of tackifier per 100 parts by weight of total of the rubber and aromatic epoxy resin, and about 0.5 to about 10 parts by weight of foaming agent per 100 parts by weight of total of the rubber and aromatic epoxy resin, wherein a total thickness of the restricting layer and reinforcing layer is not more than 3.5 mm, and wherein the steel plate reinforcing sheet has adhesion of not less than 2.0N/25 mm at 5° C. to an oiled, cold-rolled steel plate and the steel plate reinforcing sheet has bending strength of not less than 18N after heating the steel plate reinforcing sheet at 160° C. for twenty minutes.