PROPYLENE-ETHYLENE-1-BUTENE TERPOLYMER AND PRODUCTION METHOD THEREOF

To provide: a low-melting propylene-ethylene-1-butene terpolymer having a good balance between the amount of hexane-soluble matter and transparency; and a production method thereof.SOLUTION: Provided is a propylene-ethylene-1-butene terpolymer characterized in that it satisfies the conditions that 1) an ethylene content is 1.9 to 5.0% by mass and a 1-butene content is 1.1 to 4.0% by mass, 2) a total content of ethylene and 1-butene is 3.0 to 8.0% by mass, 3) a mass ratio of 1-butene content/ethylene content is 0.3 to 1.15, and 4) a melting point (Tm) is 135 to 145°C.SELECTED DRAWING: Figure 1 【課題】ヘキサン可溶分量と透明性のバランスの良い、融点が低いプロピレン・エチレン・１−ブテンターポリマー及びその製造方法を提供する。【解決手段】１）エチレン含量が１．９〜５．０質量％、１−ブテン含量が１．１〜４．０質量％、２）エチレン、１−ブテン含量の総量が３．０〜８．０質量％、３）１−ブテン／エチレン含量の質量比率が０．３〜１．１５、及び４）融点（Ｔｍ）が１３５〜１４５℃、の条件を満たすことを特徴とするプロピレン・エチレン・１−ブテンターポリマー。【選択図】図１