Thermally expandable preparations

摘要

The subject matter of the present application is a thermally expandable preparation that can be pumped at application temperatures below 70°C, containing (a) at least one first epoxy resin E1 that has an epoxy equivalent weight of no more than 280 g/eq and a viscosity of no more than 1250 Pa*s at 25°C, (b) at least one second epoxy resin E2 that has an epoxy equivalent weight of at least 300 g/eq and a viscosity of no more than 250 Pa*s at 25°C, (c) at least one hardener that can be thermally activated, (d) at least one propellant that can be thermally activated, and (e) at least 1 wt% of organic fibres having a fibre length of 0.2 mm to 10 mm.