Patent ID: 7886871

Claim:
An interlayer film for a laminated glass, which comprises at least a pair of protection layers and a sound-insulating layer sandwiched between the pair of the protection layers, and which has a wedge shape as a cross-sectional shape, a wedge angle θ of 0.1 to 0.7 mrad, the maximum thickness of 2000 μm or thinner, and the minimum thickness of 400 μm or thicker, the minimum thickness of the sound-insulating layer being 20 μm or thicker, and wherein the sound-insulating layer is selected from the group consisting of 1) a layer which comprises 40 to 80 parts by weight of a plasticizer to 100 parts by weight of a polyvinyl acetal resin having an acetalization degree of 70 to 85% by mole, 2) a layer which comprises 40 to 80 parts by weight of a plasticizer to 100 parts by weight of a polyvinyl acetal resin having an acetal group having 4 to 5 carbon atoms and having an acetylation degree of 4% by mole or more, and 3) a layer which comprises 40 to 80 parts by weight of a plasticizer to 100 parts by weight of a polyvinyl acetal resin having an acetal group having 6 to 10 carbon atoms.