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POLYETHYLENE COMPOSITION AND FILM HAVING HIGH STIFFNESS, OUTSTANDING SEALABILITY AND HIGH PERMEABILITY
POLYETHYLENE COMPOSITION AND FILM HAVING HIGH STIFFNESS, OUTSTANDING SEALABILITY AND HIGH PERMEABILITY
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机译:聚乙烯组合物和膜具有高的刚度,具有出色的稳定性和高渗透性
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摘要
A polyethylene composition includes a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of 2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 15,000 to 100,000, a molecular weight distribution Mw/Mn of 2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of 2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 10 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of ≥200 MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of ≤90° C. (at a film thickness of about 2 mil), an area of hot tack window (AHTW) of ≥160 Newtons·C° (at a film thickness of about 2 mil) and an oxygen transmission rate (OTR) of ≥600 cm3 per 100 inch2 (at a film thickness of about 1 mil).
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机译:聚乙烯组合物包括第一聚乙烯,该第一聚乙烯是重均分子量为70,000至250,000的乙烯共聚物,分子量分布M w Sub> / M n Sub>为<2.3 ,第二种聚乙烯为重均分子量为15,000至100,000的乙烯共聚物或均聚物,分子量分布M w Sub> / M n Sub>为>,第三聚乙烯是乙烯共聚物或均聚物,其重均分子量为70000至250000,分子量分布M w Sub> / M n Sub>为> 2.3,其中第一聚乙烯比第二聚乙烯或第三聚乙烯具有更多的短支链。聚乙烯组合物在CEF分析中的可溶分数为至少10重量%。由聚乙烯组合物制成的膜可具有≥200MPa的纵向1%正割模量(在约1 mil的膜厚度下),≤90°C的密封起始温度(SIT)(在约0.1 mil的膜厚度下) 2密耳),≥160牛顿·C°的热粘性窗口(AHTW)面积(膜厚约2密耳),透氧率(OTR)≥600 cm 3 Sup>每100英寸 2 Sup>(薄膜厚度约为1 mil)。
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