| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition having high heat resistance, flexibility and high transparency, and to provide a molding using the same.SOLUTION: Provided is a thermoplastic resin composition comprising 90-99.5 parts.wt. of a propylene-ethylene block copolymer [I] satisfying the following (i) through (v) and 0.5-10 parts.wt. of a thermoplastic elastomer [II] immiscible with [I] (the combined sum of both is 100 parts.wt.): (i) that it is obtained by consecutively polymerizing, by using a metallocenic catalyst, 30-95 wt.% of (A) a component consisting of propylene alone or a propylene-ethylene random copolymer having an ethylene content of 7 wt.% or below at the first step and 70-5 wt.% of (B) a propylene-ethylene random copolymer component having an ethylene content higher than that of the component (A) by 3-20 wt.% at the second step, (ii) that the MFR is 0.5-100 g/10 min, (iii) that the melting peak temperature (Tm) is 110 to 150°C, (iv) that the molecular weight distribution (Mw/Mn) is 1.5-4, and (v) that a tanδ curve in a temperature-loss tangent curve possesses a single peak at 0°C or below. |
