abstract |
The present invention relates to a pre-expanded elastomeric thermoplastic composition comprising at least 10% by weight of one or more elastomers and heat-expandable polymer particles encapsulating a heat-expandable fluid. The present invention also relates to a method for preparing an expanded elastomeric composition, comprising the steps of:-injecting the pre-expanded elastomeric composition according to the invention into a die or into an extruder die, and then-injecting the pre-expanded elastomeric composition Heating to a temperature above the expansion temperature of the heat-expandable polymer particles, preferably above 160°C. The present invention also relates to an expanded elastomeric thermoplastic composition obtainable by the above-described method. Finally, the invention also relates to a sealing lip for use in the transport industry and in the construction sector. |