Patent ID: 7572858
Filing Date: 2009-08-11
Classification: C08J,C08L

Abstract:
1. Process for the preparation of a thermoplastic elastomer comprising the steps of: (a) performing a first dynamic vulcanization stage by melt-mixing a1) at least one elastomer, a2) a first thermoplastic polymer, and a3) a first curing agent under dynamic vulcanization conditions to form a partially vulcanized rubber concentrate, and thereafter (b) performing a second dynamic vulcanization stage by melt-mixing (b1) the partially vulcanized rubber concentrate formed according to step (a) with an added amount of (b2) a second thermoplastic polymer and (b3) a second curing agent under dynamic vulcanization conditions to form the thermoplastic elastomer, wherein the first curing agent a3) and the second curing agent b3) are each independently selected from the group consisting of phenolic resins, siloxane compounds, peroxides, sulfur, sulfurous compounds and mixtures thereof.