MULTILAYER FILM AND INTERMEDIATE FILM FOR LAMINATED GLASS FORMED OF SAME

摘要

A multilayer film which has a layer (X) that contains a polyvinyl acetal (I) having an acetalization degree of 55-80% by mole and a content of a vinyl ester monomer unit of 0.1-1.5% by mole and a layer (Y) that contains a polyvinyl acetal (II) having an acetalization degree of 70-85% by mole and a content of a vinyl ester monomer unit of 5-15% by mole, and wherein both the polyvinyl acetal (I) and the polyvinyl acetal (II) satisfy formulae (1) and (2). (A - B)/A < 0.60 (1) 0.50 × 10-3 ≤ b ≤ 1.00 × 10-2 (2) Consequently, there can be provided a film which has sufficient sound absorption performance, reduced inclusion of foreign substances (unsolved contents) and excellent recyclability, while being suppressed in coloration caused by heating.