| abstract |
A random 1-butene/ethylene copolymer, suitable for use in the production of molded articles, has the following characteristics (A) to (F):(A) it comprises 50 to 99 moles % of the 1-butene component and 50 to 1 mole% of the ethylene component,(B) it has an intrinsic viscosity [η], measured in decalin at 135°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 to 130°C,(D) it has a crystallinity, measured by X-ray diffractometry, of from 1 to 60%,(E) the amount [W<sub>1</sub> in % by weight] of that portion of it which is soluble in boiling acetate is not more than 2%, and(F) the amount [W<sub>2</sub> 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°C is 5 x [η]<sup>-1.2</sup> or less. |