| 摘要 |
The present invention relates to a hot-expandable or -expanded mastic composition which can be used for the structural reinforcement of a hollow metal body, to a process for preparing this composition, to such a hollow body and to a use of this composition. The invention applies in particular to body panels for motor vehicles, airborne vehicles and space vehicles. An expandable or expanded mastic composition according to the invention is based on at least one epoxy resin, and it also comprises at least one block copolymer chosen from the group consisting of copolymers of formula SBM and of formula MAM, where S, B, M and A respectively denote polymeric blocks predominantly derived from a vinylaromatic monomer, from a conjugated diene monomer, from methyl methacrylate and from an alkyl acrylate or methacrylate.
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