Patent ID: 8841359

Claim:
A method for producing an elastomer composition (C) having no thermoplasticity which comprises a matrix of a thermoplastic resin (A) in which a dispersed phase of an elastomer component (B) is finely dispersed to form an island-in-sea structure, wherein volume ratios of the thermoplastic resin (A) and the elastomer component ( 3 ) satisfy the following formula (I): φ d/φm>ηd/ηm (I) where φd and ηd, respectively, indicate a volume ratio and a melt viscosity of the elastomer component (B) and φm and ηm, respectively, indicate a volume ratio and a melt viscosity of the thermoplastic resin (A), said method comprising: mixing and shaping a thermoplastic resin (A), an elastomer component (B) and a plasticizer (D) in a ratio satisfying the following formulae (II) and (III): φ d /(φ m+φ 1)×(η n/ηd )<1 (II) η ml/ηd= 0.8-1.2 (III) wherein φd and ηd, respectively, indicate a volume ratio and a viscosity of the elastomer component (B), φm indicates a volume ratio of the thermoplastic resin (A), φ1 indicates a volume ratio of the plasticizer (D) and ηml indicates a melt viscosity of a mixture of the thermoplastic resin (A) and the plasticizer (D); and, then, removing the plasticizer (D) by evaporation, extraction or migration.