PROPYLENE-BASED RESIN SHEET

摘要

PROBLEM TO BE SOLVED: To obtain a propylene-based resin sheet having excellent balance among scratch resistance on the surface, transparency and low-temperature impact resistance, provided with high-frequency weld characteristics by increasing a dielectric dissipation factor. SOLUTION: This propylene-based resin sheet is obtained from 50-99 wt.% of a polypropylene-based composition and 1-50 wt.% of an ethylene-based copolymer. The polypropylene-based composition is composed of a crystalline polypropylene component and a copolymer component of propylene and anα-olefin, the copolymer component has <=6.5 dl/g intrinsic viscosity [η]RC, the ratio of [η]RC/[η]PP of the intrinsic viscosity of the copolymer component to the intrinsic viscosity [η]PP of the crystalline propylene component is 0.6-1.2. When the weight of the crystalline polypropylene component is WPP and the weight of the copolymer component is WRC, the product ([η]RC/[η]PP)×(WPP/ WRC) is in a range of 0.2-4.5. The ethylene-based copolymer is 60-90 cal/cm3 cohesive energy density and the peak value of dielectric dissipation factor is 5.0×10-3 (100 kHz).