Expandable material with improved thermal insulation properties and use thereof
AssigneeSika Technology AG
InventorsDusko Paripovic, Christian Hardt, Jan Spengler, Jean Georges Becker, Achim Kohl
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Abstract
A thermally expandable composition includes at least one polymer P, at least one chemical blowing agent CBA, at least one physical blowing agent PBA composed of expandable microspheres, and at least one filler F. A damping element includes a first layer composed of an expansion material and a second layer composed of an acoustic damping material. The damping element is suitable for providing vibration and/or noise damped systems.
Claims25
A thermally expandable composition comprising:
- a1) at least one polymer P,
- a2) at least one chemical blowing agent CBA,
- a3) at least one physical blowing agent PBA, and
- a4) at least one filler F,
- wherein the at least one physical blowing agent PBA is composed of expandable microspheres, and
- wherein the thermally expandable composition is essentially free of epoxy resins having an average of more than one epoxy group per molecule.
A damping element comprising a first layer composed of an expansion material and a second layer composed of an acoustic damping material,
- wherein the expansion material has an expansion rate of at least 100%, and
- wherein the acoustic damping material comprises:
- b1) a bitumen component BC or a polymer component PC,
- b2) at least one hydrocarbon resin HR,
- b3) optionally at least one wax W,
- b4) optionally at least one plasticizer PL, and
- b5) At least 25 wt.-% based on the total weight of the acoustic damping material, of at least one solid particulate filler PF.
Dependencies are inferred from the claim text.