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    • 3. 发明申请
    • POLYETHYLENE FILMS AND METHOD OF MAKING THE SAME
    • 聚乙烯薄膜及其制备方法
    • WO2008124557A1
    • 2008-10-16
    • PCT/US2008/059338
    • 2008-04-04
    • DOW GLOBAL TECHNOLOGIES INC.DESJARDINS, SylvieSPRINGS, MarcHUSTAD, PhillipWIKER, NathanNIETO, JesusKONZE, Wayde
    • DESJARDINS, SylvieSPRINGS, MarcHUSTAD, PhillipWIKER, NathanNIETO, JesusKONZE, Wayde
    • C08J5/18
    • C08F210/16C08J5/18C08J2323/08C08F4/52C08F210/14C08F2500/03C08F2500/12C08F2500/17C08F2500/26
    • The instant invention is a polyethylene film, and method of making the same. The polyethylene film according to instant invention includes at least one heterogeneously branched ethylene/α-olefin copolymer having a density in the range of about 0.910 to about 0.930 g/cm 3 , a molecular weight distribution in the range of about 2.8 to 3.8,, a melt index (I 2 ) in the range of about 0.3 to about 4 g/10 min, and an I 10 /I 2 ratio in the range of 6.5 to about 7.8. The film has a normalized dart impact strength of equal or greater than (6666-7012* density ) g/mil, a normalized tear strength of equal or greater than (440* e -( density -0.915) 2 / 2*(0.00949) 2 ) g/mil, and a haze in the range of 3 to 10 percent. The method of making the polyethylene film according to instant invention includes the following steps: (1) providing at least one heterogeneously branched ethylene/α-olefin copolymer having a density in the range of about 0.910 to about 0.930 g/cm 3 , a molecular weight distribution in the range of about 2.8 to 3.8,, a melt index (I 2 ) in the range of about 0.3 to about 4 g/10 min, and an I 10 /I 2 ratio in the range of 6.5 to about 7.8; (2) processing the heterogeneously branched ethylene/α-olefin copolymer via blown film extrusion process or cast film extrusion process; and (3) thereby forming a film having a normalized dart impact strength of equal or greater than (6666-7012* density ) g/mil, a normalized tear strength of equal or greater than (440* e -( density -0.915) 2 / 2*(0.00949) 2 ) g/mil, and a haze in the range of 3 to 10 percent.
    • 本发明是一种聚乙烯薄膜及其制造方法。 根据本发明的聚乙烯膜包括至少一种密度在约0.910至约0.930g / cm 3范围内的非均匀支化的乙烯/α-烯烃共聚物,分子量分布范围 约2.8至3.8μm,约0.3至约4g / 10min范围内的熔体指数(I 2 S 2 N)和1×10 3 / > 2 <6>范围在6.5至7.8之间。 标准化的落镖冲击强度等于或大于(6666-7012 *密度)g / mil,归一化的撕裂强度等于或大于(440 * e - (密度-0.915)2 / > / 2 *(0.00949)2 / g / mil,雾度在3%至10%的范围内。 根据本发明的制备聚乙烯膜的方法包括以下步骤:(1)提供至少一种密度在约0.910至约0.930g / cm 3范围内的非均匀支化的乙烯/α-烯烃共聚物 在约2.8至3.8的范围内的分子量分布,约0.3至约4g / 10min范围内的熔体指数(I 2 N 2)和I 在6.5至约7.8的范围内的比例为10〜10 / (2)通过吹膜挤出法或流延膜挤出法处理非均匀支化的乙烯/α-烯烃共聚物; (3)由此形成具有等于或大于(6666-7012 *密度)g / mil的标准化飞镖冲击强度的膜,等于或大于(440 * e-(密度-0.915) SUP> 2/2 *(0.00949)2 / g / mil,雾度在3%至10%的范围内。