Abstract: To provide a vibration damping composition: excellent in vibration damping property and thermal drying property in a wide temperature range; and sufficiently suppressing sagging of a vibration damping coating film on the vertical surface; and therefore useful for vibration damping materials of various structures. 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 at least one of the acrylic copolymers (A) and (B) is prepared by copolymerizing a monomer component comprising methacrylic acid.

Abstract: The present invention relates to an emulsion for vibration damping materials, including an emulsion obtainable by emulsion polymerization of a monomer component, wherein the emulsion is obtainable by emulsion polymerization using an anionic emulsifier and/or a reactive emulsifier, and emulsion particles have an average particle diameter of 100 to 450 nm, and an emulsion for vibration damping materials, comprising acrylic emulsion particles each having a core part and a shell part, wherein the acrylic emulsion particles are obtainable by polymerizing a monomer component including a monomer having a Q value of 0.6 to 1.4 and an e value of ?0.4 to ?1.2.

Abstract: The present invention provides an emulsion composition for a vibration damper, which has heating and drying properties high enough to form an excellent coating film which can exhibit excellent damping without swelling during drying by heating, and an emulsion composition for a vibration damper, which can exhibit basic performances demanded in vibration dampers, in particular, markedly superior anti-sagging even under the condition of high humidity or a thick film where the coating film may sag in conventional technologies, and thus can be useful in vibration dampers of various structures. The emulsion composition for a vibration damper includes an emulsion obtainable by emulsion polymerization of monomer components, the emulsion composition containing 0.5 to 20% by mass of a film-forming agent with a weight average molecular weight of 100 to 20000 in 100% by mass of the emulsion composition.

Abstract: 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 5.0×107 to 8.0×108 Pa at 20° C. and a storage modulus value of 1.0×105 to 5.0×106 Pa at 50° C., the emulsion has a loss modulus value of 4.0×107 to 4.0×108 Pa at 20° C. and a loss modulus value 1.0×105 to 7.0×106 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.

Abstract: To provide a vibration damping composition: excellent in vibration damping property and thermal drying property in a wide temperature range; and sufficiently suppressing sagging of a vibration damping coating film on the vertical surface; and therefore useful for vibration damping materials of various structures. 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 at least one of the acrylic copolymers (A) and (B) is prepared by copolymerizing a monomer component comprising methacrylic acid.

Abstract: The present invention has an object to provide at least one of the following (1) to (3). (1) To provide the following emulsion for vibration damping materials: it is excellent in vibration damping property, drying property, and mechanical stability; it can improve skinning property of the coating film surface; and it can form an excellent coating film which hardly collapses, for example, hardly sags, even if the emulsion is coated on the vertical surface and dried by heating at a high temperature. (2) To provide the following emulsion for vibration damping materials: it is excellent in vibration damping property and thermal drying property; it is hardly changed with time; it can improve the stability or dispersibility of the composition; and it can form a coating film exhibiting excellent vibration damping property even if the emulsion is coated on an inclined object.

Abstract: To provide an emulsion for vibration damping materials: excellent in vibration damping property in a wide temperature range, thermal drying property, and film-forming property at low temperatures; and sufficiently suppressing sagging of a vibration damping coating film on the vertical surface; and therefore useful for vibration damping materials of various structures. An emulsion for vibration damping materials, comprising a particle having: a core part formed from an acrylic copolymer (A); and a shell part formed from an acrylic copolymer (B) , wherein at least one of the acrylic copolymer (A) and the particle having the core part and the shell part has a weight average molecular weight of 20000 to 250000.

Abstract: To provide an emulsion for vibration damping materials particularly excellent in vibration damping property in a wide temperature range, and therefore useful for vibration damping materials of various structures. An emulsion for vibration damping materials, comprising an acrylic copolymer prepared by copolymerizing a monomer component comprising a polar group-containing monomer, wherein the polar group-containing monomer has a SP value (solubility coefficient) of 10.0 or more and 14.0 or less; and An emulsion for vibration damping materials, comprising an acrylic copolymer prepared by copolymerizing a monomer component comprising a polar group-containing monomer, wherein the polar group-containing monomer is acrylonitrile, and the polar group-containing monomer is less than 10% by weight relative to 100% by weight of the total monomer component.

Abstract: To provide an emulsion for vibration damping materials: excellent in vibration damping property in a wide temperature range, drying property, and mechanical stability; and capable of improving skinning property of the coating film surface. An emulsion for vibration damping materials, comprising an emulsion produced using an anionic emulsifier, wherein the anionic emulsifier is at least one selected from the group consisting of polyoxyethylene alkyl ether sulfate ester salts, alkyl diphenyl ether disulfonates, and alkenyl disuccinates, and a use amount of the anionic emulsifier is 1.0 part or more relative to 100 parts by weight of a total amount of a monomer component used for producing the emulsion.

Abstract: A water-based emulsion for vibration damper is provided for the formation of an excellent vibration damper. In an aspect, the emulsion for vibration damper contains a particle including a core part formed of an acrylic copolymer (A) and a shell part formed of an acrylic copolymer (B) which covers the core part, the glass transition point of the acrylic copolymer (B) being not lower than ?9° C., and the difference between the glass transition point of the acrylic copolymer (B) and the glass transition point of the acrylic copolymer (A) being not less than 20° C.

Abstract: A water-based emulsion for vibration damper is provided for the formation of an excellent vibration damper. In an aspect, the emulsion for vibration damper contains a particle including a core part formed of an acrylic copolymer (A) and a shell part formed of an acrylic copolymer (B) which covers the core part, the glass transition point of the acrylic copolymer (B) being not lower than ?9° C., and the difference between the glass transition point of the acrylic copolymer (B) and the glass transition point of the acrylic copolymer (A) being not less than 20° C.

Abstract: It is an object of the present invention to provide the paint composition for thermal drying which is favorable as material forming a thick film since it can develop an excellent thermal drying characteristics.