INTERLAYER FOR LAMINATED GLASS, AND LAMINATED GLASS

摘要

Provided is an interlayer for laminated glass, said interlayer making it possible to increase the flexural rigidity of laminated glass and increase the sound insulation properties of laminated glass. An interlayer for laminated glass according to the present invention is provided with first, second, and third layers that include a polyvinyl acetal resin and a plasticizer, wherein: the content ratio of polyvinyl acetal resin hydroxyl groups in the first layer is lower than the content ratios of polyvinyl acetal resin hydroxyl groups in the second and third layers; if the absolute values for the differences between the content ratios of polyvinyl acetal resin hydroxyl groups in the second and third layers and the content ratio of polyvinyl acetal resin hydroxyl groups in the first layer are termed XA and XB, the absolute values XA and XB are 9-11 mol%, inclusive; and if the content of the plasticizer in the interlayer with respect to 100 parts by weight of the polyvinyl acetal resin in the interlayer is termed Y, Y ≤ -1.68XA+56 and Y ≤ -1.68XB+56 are satisfied.