| abstract |
An interlayer film for laminated glass that enhances the sound insulation of the laminated glass is provided. An interlayer film for laminated glass according to the present invention includes a first layer containing a polyvinyl acetal resin and a plasticizer, and a second layer. In the phase diagram of three values of the acetalization degree X, the acetylation degree Y, and the hydroxyl group content Z in the polyvinyl acetal resin in the first layer 2, the acetalization degree X, the acetylation degree Y, and the hydroxyl group content The ratio Z is the first coordinate A ((X) :( Y) :( Z) = 70 mol%: 30 mol%: 0 mol%) and the second coordinate B ((X) :( Y)), respectively. : (Z) = 34 mol%: 30 mol%: 36 mol%) and the third coordinates C ((X) :( Y) :( Z) = 94 mol%: 0 mol%: 6 mol%) 4 in the region R1 surrounded by a line L1 connecting four coordinates D ((X) :( Y) :( Z) = 100 mol%: 0 mol%: 0 mol%) in this order. Value. [Selection] Figure 1 |