| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene blow-molded hollow article which has uniform and fine foamed cells which are not ruptured, has rigidity, and is excellent in thickness uniformity. SOLUTION: The polypropylene blow-molded hollow article is obtained by blow-molding a propylene resin composition comprising a propylene polymer (X) which satisfies the requirements defined in the following (i) to (vi) and a foaming agent (F). (i) MFR is 0.1-20 g/10 minutes. (ii) The ratio (Q factor) of the weight average molecular weight to the number average molecular weight is 3.5-10.5. (iii) The percentage of the component having a molecular weight (M) of 2,000,000 or more is 0.4 wt.% or more and less than 10 wt.%. (iv) In temperature rising elution fractionation (TREF), the component eluted at a temperature of 40°C or less is 3.0 wt.% or less. (v) The isotactic triad molar fraction (mm) is 95% or more. (vi) The rate of strain hardening (λmax) in measurement of elongational viscosity is 6.0 or more. COPYRIGHT: (C)2010,JPO&INPIT |
