The invention relates to a biaxially oriented polypropylene (BOPP) film comprising a propylene homopolymer or propylene-ethylene copolymer having an ethylene content of at most 1.0 wt % based on the propylene-ethylene copolymer having an Mw/Mn in the range from 5.0 to 12, wherein Mw stands for the weight average molecular weight and Mn stands for the number average weight and wherein Mw and Mn are measured according to ASTM D6474-12, an XS in the range from 1.0 to 6.0 wt %, wherein XS stands for the amount of xylene solubles which are measured according to ASTM D 5492-10, a melt flow rate in the range of 1 to 10 dg/min as measured according to IS01133 (2.16 kg/230° C.) and a crystal size distribution as indicated by a height/width ratio of the highest peak of the first cooling curve of at least 0.70 W/g° C. as determined by ASTM D3418-08 using a heating and cooling rate of 10° C./min.
本发明涉及一种双向拉伸聚
丙烯(B
OPP)薄膜,该薄膜由
丙烯均聚物或
丙烯-
乙烯共聚物组成,其
乙烯含量最多为 1.0 wt %(基于
丙烯-
乙烯共聚物),Mw/Mn 在 5.0 至 12 之间,其中 Mw 代表重量平均分子量,Mn 代表数均分子量,其中 Mw 和 Mn 根据 ASTM D6474-12 测量;XS 在 1.0 至 6.0 wt % 之间,其中 XS 代表二
甲苯溶质量,根据 ASTM D 5492-10 测量;熔体流动速率在 1 至 10 dg/min 之间。其中,XS 代表二
甲苯溶质的量,根据 ASTM D 5492-10 测量;熔体流动速率在 1 至 10 dg/min 范围内,根据 IS01133 测量(2.16 kg/230°C);晶体尺寸分布,根据 ASTM D3418-08 测定,第一冷却曲线最高峰的高度/宽度比至少为 0.70 W/g°C,加热和冷却速率为 10° C./min。