申请人:Kuraray Co., Ltd.
公开号:EP3064352A1
公开(公告)日:2016-09-07
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.
提供了一种多层薄膜,包括一层(X),该层含有聚乙烯醇缩醛(I),其缩醛度为 55 至 80 摩尔%,乙烯基酯单体单元含量为 0.1 至 1.5 摩尔%,粘度平均聚合度为 1,400 至 5,000 度;以及一层(Y),该层含有聚乙烯醇缩醛(II),其缩醛度为 70 至 85 摩尔%。5 mol%,平均聚合粘度为 1,400 至 5,000 度;以及一层 (Y),该层含有聚乙烯醇缩醛 (II),其缩醛度为 70 至 85 mol%,乙烯基酯单体单元含量为 5 至 15 mol%,平均聚合粘度为 1,400 至 5,000 度,其中多层膜满足式 (1) 和 (2):(A-B)/A < 0.80 (1)和 1.00 × 10-2 < (b/y)/(a/x) < 2.00 × 10-1 (2)。因此,本发明提供的薄膜具有足够的吸音性、耐加热着色性、减少异物(未溶解物质)和出色的可回收性。