INTERLAYER FOR LAMINATED GLASS AND LAMINATED GLASS
There are provided an interlayer for laminated glass having a multilayer structure, capable of sufficiently suppressing generation of air bubbles and increase of area of air bubbles when the interlayer is made into a laminated glass. The interlayer for laminated glass includes alternately laminated at least one skin layer and two or more core layers, the skin layer having a storage modulus of 1.0×10 6 Pa or more measured by a dynamic viscoelasticity test under conditions of a frequency of 1 Hz, a swing angle gamma of 0.01% and a temperature of 20° C., and the core layers having a storage modulus of less than 1.0×10 6 Pa, wherein a value of a product of a value obtained by averaging thicknesses (mm) of the respective core layers and a thickness (mm) of the whole interlayer for laminated glass is 0.15 or more.
1 : An interlayer for laminated glass, comprising
alternately laminated at least one skin layer and two or more core layers,
wherein the skin layer having has a storage modulus of 1.0×10 6 Pa or more measured by a dynamic viscoelasticity test under conditions of a frequency of 1 Hz, a swing angle gamma of 0.01% and a temperature of 20° C., and the core layers each has a storage modulus of less than 1.0×10 6 Pa measured by the same dynamic viscoelasticity test under the same conditions,
wherein a value of a product of a value obtained by averaging thicknesses by mm of the respective core layers and a thickness by mm of the whole interlayer for laminated glass is 0.15 or more.
2 : The interlayer according to claim 1 , wherein both of
a distance from a surface on a side of one principal surface of the interlayer of the core layer being farthest from the one principal surface to the one principal surface of the interlayer, and
a distance from a surface on a side of another principal surface of the interlayer of the core layer being farthest from the another principal surface to the another principal surface of the interlayer are 0.6 to 5.0 mm.
3 : The interlayer according to claim 1 , which has a thickness of 0.8 to 5.2 mm.
4 : The interlayer according to claim 1 , wherein each of two outermost layers of the interlayer comprises the skin layer.
5 : The interlayer according to claim 1 , comprising
three or more core layers.
6 : The interlayer according to claim 1 , wherein a value obtained by subtracting the storage modulus of the core layer from the storage modulus of the skin layer is in a range of 2.0×10 6 Pa to 3.0×10 7 Pa.
7 : The interlayer according to claim 1 , wherein a thickness ratio of the thickness of the whole interlayer to the thickness of each core layer is 11 or more.
8 : The interlayer according to claim 1 , wherein a thickness ratio of the thickness of the whole interlayer to the thickness of each core layer is 15 or more.
9 : A laminated glass, comprising:
a pair of glass plates facing each other; and
the interlayer according to claim 1 sandwiched between the pair of glass plates.