摘要 |
PURPOSE:To obtain the subject composition comprising specific propylene polymer and a specific phenolic stabilizer in a specified ratio, excellent in thermal stability for a long period, and useful for sheets, etc. CONSTITUTION:This composition comprises (A) 100 pts.wt. of propylene polymer, (B) 0.001-10 pts.wt. of a phenolic stabilizer such as 2,6-di-t-butyl-4-methylphenol, and further preferably (C) 0.001-10 pts.wt. of a compound such as an organic phosphite stabilizer or a thioether stabilizer. The propylene polymer A has a MFR of 0.1-500g/10min, a stereoregularity index [M5] value of 0.970-0.995 determined by an equation I from the absorption strengths of Pmmmm Pw in the <13>C-NMR spectrum of boiling heptane-insoluble components, a stereoregularity index [M3] value of 0.0020-0.0050 determined by an equation II from the absorption strengths of Pmmrm, Pmrmr, Pmrrr, Prmrr, Prmmr, Prrrr, Pw in the <13>C-NMR spectrum of boiling hepthane-insoluble components, and a boiling heptane- insoluble component crystallinity of >=60%. |