| 摘要 |
The present invention provides an emulsion for vibration damping materials which stably exhibits excellent vibration damping property in a wide temperature range and exhibits excellent mechanical stability and which can be preferably used in various applications where a coating vibration damping material is used. The emulsion for vibration damping materials of the present invention is an emulsion for vibration damping materials, including an emulsion obtainable by emulsion polymerization of a monomer component, wherein the emulsion has a storage modulus value of 5.0x107 to 8.0x108 Pa at 20° C. and a storage modulus value of 1.0x105 to 5.0x106 Pa at 50° C., the emulsion has a loss modulus value of 4.0x107 to 4.0x108 Pa at 20° C. and a loss modulus value 1.0x105 to 7.0x106 Pa at 50° C., the emulsion has a maximum peak of a loss tangent of 1.3 or more in a range from 20 to 50° C., and a vibration damping composition including the emulsion has an aggregation ratio of 0.01 or less, the aggregation ratio being measured by a mechanical stability test in accordance with JIS K6828:1996.
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