THERMOPLASTIC ELASTOMER COMPOSITION FOR PRE-EXPANSION COMPRISING AN ELASTOMER AND A PHYSICAL EXPANSION AGENT

摘要

The invention relates to a pre-expansion elastomeric thermoplastic composition comprising at least 10% by weight of one or more elastomers and heat-expandable polymeric particles encapsulating a heat-expandable fluid.The invention also relates to a process for preparing an expanded elastomeric thermoplastic composition comprising the following steps: injection into a mold or addition in an extruder die of the elastomeric pre-expansion composition according to the invention, then heating the elastomeric composition of pre-expansion at a temperature above the expansion temperature of the heat-expandable polymeric particles, preferably greater than 160 ° C. The invention also relates to an expanded elastomeric thermoplastic composition obtainable by the process. Finally, the subject of the invention is a sealing lip used in home appliances. transport industry and in the building industry.