| 摘要 |
<p>A crystalline random propylene copolymer composition comprising (i) a crystalline random propylene copolymer comprising 99 to 85 mole % of propylene and 1 to 15 mole % of an alpha-olefin other than propylene and (ii) a random 1-butene copolymer comprising ethylene and 1-butene, the weight ratio of the copolymer (i) to the copolymer (ii) being in the range of from 5:95 to 90:10, said random 1-butene copolymer (ii) satisfying the following conditions: (A) it comprises 1 to 50 mole % of the ethylene component and 50 to 99 mole % of the 1-butene component, (B) it has an intrinsic viscosity [ eta ], measured in decalin at 135 DEG C., of from 0.5 to 6 dl/g, (C) it has a melting point [Tm], measured by a differential scanning calorimeter, of from 30 DEG to 130 DEG C., (D) it has a crystallinity, measured by X-ray diffractometry, of from 1 to 60%, (E) the amount [W1 in % by weight] of that portion of it which is soluble in boiling methyl acetate is not more than 2%, and (F) the amount [W2 in % by weight] of that portion of it which is soluble in a 1:1 by volume mixture of acetone and n-decane at 10 DEG C. is less than 5x[ eta ]-1.2.</p> |
