Patent ID: 6861470

Claim:
A process for producing a thermoplastic elastomer composition comprising the steps of: mixing a rubber composition (A) and a thermoplastic resin (B) under conditions of the following equations (I) and (II): (φ A /φ B )×(η B /η A )<1.0 (I) 0.8<(η A /η B )<1.2 (II) wherein φ A : volume fraction of rubber composition (A), φ B : volume fraction of resin (B), η A : melt viscosity of rubber composition (A), η B : melt viscosity of resin (B) to form a composition (C); and mixing the resultant composition (C) and a rubber composition (D) under conditions of the following equations (III) and (IV): (φ D /φ C )×(η C /η D )<1.0 (III) 0.8<(η C /η D )<1.2 (IV) wherein φ D : volume fraction of rubber composition (D), φ C : volume fraction of composition (C), η D : melt viscosity of rubber composition (D), η C : melt viscosity of composition (C)).