| 摘要 |
PURPOSE:To obtain the title film of extremely high rigidity and also good in appearance such as transparency by drawing a composition satisfying each specified condition for melting point, crystallization temperature and xylene solubles, comprising a crystalline propylene polymer and a specified amount of nucleating agent. CONSTITUTION:The objective film can be obtained by drawing a composition comprising (A) a crystalline propylene polymer and (B) 0.1wt.ppm-10wt.% (pref. 1000wt.ppm-2wt.%) of a nucleating agent (pref. a polymer from >=6C 3-site branched alpha-olefin or vinylcycloalkane, esp. the latter), and furthermore, if needed, (C) other ingredient(s). Said composition has the following characteristics: melting point: >=160 deg.C (pref. >=164 deg.C, esp. >=166 deg.C); crystallization temperature: >=128 deg.C; 20 deg.C xylene solubles: <=3wt.% (pref. <=2.5wt.%). |
