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发明公开
CN109153803A 涂布膜和由其形成的包装 无效 - 驳回

涂布膜和由其形成的包装
摘要：
本发明提供涂布膜和由这类膜形成的包装。在一个方面中，涂布膜包含：(a)膜，所述膜包含(i)第一层，所述第一层包含70至100重量％的密度为0.930g/cm3或更小并且峰值熔点小于126℃的聚乙烯；(ii)第二层，所述第二层包含60至100重量％的密度为0.905至0.970g/cm3并且峰值熔点在100℃至135℃范围内的聚乙烯；和(iii)在所述第一层与所述第二层之间的至少一个内层，所述内层包含40至100重量％的密度为0.930至0.970g/cm3并且峰值熔点在120℃至135℃范围内的聚乙烯，其中所述聚乙烯是中密度聚乙烯或高密度聚乙烯；以及(b)在所述膜的所述第二层的外表面上的包含交联聚氨酯的涂层，其中所述涂层基本上不含异氰酸酯基团。在一些实施例中，所述涂布膜当在至少230°F温度下经历W-折叠测试时是耐热的，和/或在60°下具有至少70个单位的光泽度。
摘要（英）：

The invention provides coated films and packages formed from such films. In one aspect, a coated film comprises (a) a film comprising (i) a first layer comprising from 70 to 100 percent by weight of apolyethylene having a density 0.930 g/cm3 or less and a peak melting point of less than 126 DEG C; (ii) a second layer comprising from 60 to 100 percent by weight polyethylene having a density of 0.905 to 0.970 g/cm3 and a peak melting point in the range of 100 DEG C to 135 DEG C; and (iii) at least one inner layer between the first layer and the second layer comprising from 40 to 100 percent byweight of a polyethylene having a density from 0.930 to 0.970 g/cm3 and a peak melting point in the range of 120 DEG C to 135 DEG C, wherein the polyethylene is a medium density polyethylene or a highdensity polyethylene; and (b) a coating on an outer surface of the second layer of the film comprising a crosslinked polyurethane, wherein the coating is substantially free of isocyanate groups. In some embodiments, the coated film is thermally resistant when subjected to a W-fold test at a temperature of at least 230 DEG F, and/or has a gloss of at least 70 units at 60 degrees.

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