Patent ID: 8664286

Claim:
A vibration damping composition comprising an emulsion for vibration damping materials, a foaming agent, and an inorganic pigment, wherein the emulsion for vibration damping materials comprises a particle having a core part formed from an acrylic copolymer (A) and a shell part formed from an acrylic copolymer (B), and the acrylic copolymer (B) forming the shell part is prepared by copolymerizing a monomer component comprising methacrylic acid; wherein the amount of said methacrylic acid is 4% by weight or more and is 20% by weight or less, relative to 100% by weight of the total amount of the monomer component used for preparing the acrylic copolymer (B) comprising methacrylic acid, and wherein the inorganic pigment comprises a flaky inorganic pigment, wherein said flaky inorganic pigment is a pigment forming a layer structure inside a coating film formed from said vibration damping composition of which they are a part, and wherein said flaky inorganic pigment comprises mica, and the amount of the flaky inorganic pigment is 30 to 150 parts by weight relative to 100 parts by weight of the emulsion for vibration damping materials.