To provide a foamable thermoplastic resin composition which not only has good sealing performance, openability and gas barrier properties, but also does not contain a softner, or is excellent in processing moldability even if adding only a small amount of the softner; and to provide a foamed molded body and a synthesized cork using the composition. 密封性、開栓性、ガスバリア性が良好なだけでなく、軟化剤を含有せず、もしくは軟化剤を少量添加しただけでも加工成形性に優れた発泡性熱可塑性樹脂組成物およびこれを用いた発泡成型体、合成コルクを提供すること。 - 特許庁