| 摘要 |
PURPOSE:To produce the subject composition having excellent vacuum forming property, producible at a low cost, free from influence upon the picture quality of a photographic material and suitable as a packaging material for photosensitive material by compounding a polypropylene resin having a specific melt flow rate with an ethylene/alpha-olefin copolymer resin at a specific ratio. CONSTITUTION:The objective composition is produced by compounding (A) 50-90wt.% of a polypropylene resin having a melt flow rate of 0.1-10g/10min, (B) 10-49.9wt.% of an ethylene/alpha-olefin copolymer resin having a melt flow rate of 0.5-20g/10min and (C) 0.05-5wt.% of a light-shielding black substance (e.g. carbon black or graphite). Preferably, the component A has a flexural modulus of >=8,000kg/cm<2> at 23 deg.C and a Rockwell hardness of >=70R and the component B has a density of 0.910-0.935g/cm<3>, an Olsen rigidity of >=1,500kg/cm<2> and a Shore hardness of >=40D. |
