Heat expandable foam
AssigneeSika Technology AG
InventorsLeslie Michele Wolschleger, Jena Mabilia, Sascha Pasula
Life of this patent
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Abstract
A composition for an expandable sealant including at least one polymeric material selected from the group consisting of low density polyethylenes (LDPE), linear low density polyethylenes (LLPDE), ethylene vinyl acetate (EVA), ethylene methacrylate (EMA), and ethylene-butyl acrylate (EnBA); and a chemical blowing agent, wherein the composition is substantially free of a cross-linking agent.
Claims3
A method comprising sealing, baffling or reinforcing a cavity or hollow structure of a land-, water-, or air-vehicle and/or a cavity of a building such that the transmission of noise, vibrations, humidity, and/or heat is reduced, and/or the object surrounding said cavity is mechanically strengthened with an expansible sealant or baffle component, the component comprising:
- a polymeric material selected from the group consisting of low density polyethylenes (LDPE), linear low density polyethylenes (LLPDE), ethylene vinyl acetate (EVA), ethylene methacrylate (EMA), ethylene-butyl acrylate (EnBA), and mixtures thereof, the polymeric material having:
- a logarithmic value of a tangent of loss modulus divided by storage modulus (log(tan δ)) in a range of from −0.2 to 0.2, and
- a logarithmic value of complex viscosity (log(η*)) in a range of from 3 to 4, the log(tan δ) and the log(η*) being determined according to ASTM D4440-15;
- a chemical blowing agent selected from the group consisting of 4,4′-oxybis(benzenesulfonylhydrazide) and sodium bicarbonate;
- and
- optionally a carrier element;
- wherein the component is substantially free of a cross-linking agent.
Dependencies are inferred from the claim text.