| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin compsn. for gas-assisted injection molding which, while maintaining impact resistance, rigidity, moldability, and lightweight properties, can eliminate poor appearance, such as uneven gloss, can eliminate the need to conduct secondary surface treatment, such as painting, and has excellent productivity by using an ethylene/propylene block copolymer. SOLUTION: This resin compsn. for gas-assisted injection molding comprises: (A) 90 to 50 wt.% ethylene/propylene block copolymer having an MFI of 1 to 60 g/10 min; and (B) 10 to 50 wt.% high density polyethylene having a density of not less than 950 kg/m<3> , the relationship between the melt viscosityηPP of the component A and the melt viscosityηPE of the component B being represented by the formula: 0.5<(ηPE/ηPP)<2.5 (wherein the melt viscosity is a measured value at a temp. of 220 deg.C and a shear rate of 1.22×10<3> sec<-1> ). |
