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发明授权
CN105848894B 多层薄膜和包含其的夹层玻璃用中间膜 失效 - 权利终止

多层薄膜和包含其的夹层玻璃用中间膜
摘要：
一种多层薄膜，其具有：含有缩醛化度为55～80摩尔％、乙烯基酯单体单元的含量为0.1～1.5摩尔％且粘均聚合度为1400～5000的聚乙烯醇缩醛(I)的层(X)、以及含有缩醛化度为70～85摩尔％、乙烯基酯单体单元的含量为5～15摩尔％且粘均聚合度为1400～5000的聚乙烯醇缩醛(II)的层(Y)，并且满足下述式(1)和(2)：(A‑B)/A＜0.80(1)1.00×10‑2＜(b/y)/(a/x)＜2.00×10‑1(2)。由此，可提供具有充分的吸音性、由加热导致的着色少、异物(不溶解成分)少且再循环性也优异的薄膜。
摘要（英）：

There is provided a multilayer film comprising a layer (X) containing a polyvinyl acetal (I) having an acetalization degree of 55 to 80 mol%, a content of a vinyl ester monomer unit of 0.1 to 1.5 mol% and a viscosity-average degree of polymerization of 1,400 to 5,000; and a layer (Y) containing a polyvinyl acetal (II) having an acetalization degree of 70 to 85 mol%, a content of a vinyl ester monomer unit of 5 to 15 mol% and a viscosity-average degree of polymerization of 1,400 to 5,000, wherein the multilayer film satisfies formulas (1) and (2): (A-B)/A < 0.80 (1) and 1.00 × 10 -2 < (b/y)/(a/x) < 2.00 × 10 -1 (2). There is thus provided a film which exhibits sufficient sound-absorbability, resistance to coloration by heating, reduction in foreign materials (undissolved materials) and excellent recyclability.

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