Interlayer film for laminated glass and laminated glass
The present invention provides an interlayer film for laminated glass which has excellent sound insulating properties even when the thickness is reduced, and also hardly causes optical unevenness. An interlayer film for laminated glass includes at least one layer A containing a thermoplastic elastomer, wherein the shear storage modulus of the layer A at 70° C. as measured by performing a dynamic viscoelasticity test at a frequency of 1,000 Hz in accordance with ASTM D4065-06 is 1 MPa or more, and a layer having a higher shear storage modulus than the layer A is provided on at least one surface of the layer A, and at least one surface of the interlayer film for laminated glass is in a state of having been shaped.
1. An interlayer film for laminated glass, comprising at least one layer A containing a thermoplastic elastomer, wherein
the shear storage modulus of the layer A at 70° C. as measured by performing a dynamic viscoelasticity test at a frequency of 1,000 Hz in accordance with ASTM D4065-06 is 1 MPa or more, and a layer having a higher shear storage modulus than the layer A is provided on at least one surface of the layer A, and
at least one surface of the interlayer film for laminated glass is in a state of having been shaped.
2. The interlayer film for laminated glass according to claim 1 , wherein the elastic limit of the layer A at 20° C. is 4 N or more.
3. The interlayer film for laminated glass according to claim 1 , wherein the height of an embossed portion of the shaped surface is from 10 to 150 μm.
4. The interlayer film for laminated glass according to claim 1 , wherein the peak maximum in tan δ as measured for the layer A by performing a dynamic viscoelasticity test at a frequency of 1,000 Hz in accordance with ASTM D4065-06 appears in the range of −10 to 30° C.
5. The interlayer film for laminated glass according to claim 1 , wherein the height of the peak maximum in tan δ as measured for the layer A by performing a dynamic viscoelasticity test at a frequency of 1,000 Hz in accordance with ASTM D4065-06 is 1.3 or more.
6. The interlayer film for laminated glass according to claim 1 , wherein as the layer having a higher shear storage modulus than the layer A, a layer B containing a thermoplastic resin is provided.
7. The interlayer film for laminated glass according to claim 6 , wherein the content of a plasticizer in the layer B is 50 parts by mass or less with respect to 100 parts by mass of the thermoplastic resin.
8. The interlayer film for laminated glass according to claim 6 , wherein the thermoplastic resin in the layer B is a polyvinyl acetal resin.
9. The interlayer film for laminated glass according to claim 6 , wherein the thermoplastic resin in the layer B is an ionomer resin.
10. The interlayer film for laminated glass according to claim 1 , wherein a laminated glass in which the interlayer film for laminated glass is sandwiched between two glasses with the total thickness of the glasses being 4 mm or less has a sound transmission loss at 4,000 Hz as measured under the conditions of ASTM E 90-09 of 37 dB or more.
11. The interlayer film for laminated glass according to claim 1 , wherein the thermoplastic elastomer is composed of a hard segment block and a soft segment block, and the hard segment block is a polystyrene block or a polymethyl methacrylate block.
12. The interlayer film for laminated glass according to claim 1 , further comprising a heat shielding material in at least one of the layers constituting the interlayer film for laminated glass.
13. The interlayer film for laminated glass according to claim 1 , wherein a laminated glass in which the interlayer film for laminated glass is sandwiched between two clear glasses with the total thickness of the glasses being 4 mm or less has a visible light transmittance of 70% or more and an average transmittance of infrared light in the wavelength range of 800 to 1,100 nm of 70% or less.
14. The interlayer film for laminated glass according to claim 1 , wherein a laminated glass in which the interlayer film for laminated glass is sandwiched between two green glasses with the total thickness of the glasses being 4 mm or less has a visible light transmittance of 70% or more and an average transmittance of infrared light in the wavelength range of 800 to 1,100 nm of 32% or less.
15. The interlayer film for laminated glass according to claim 1 , further comprising a heat shielding material,
wherein the heat shielding material is at least one material selected from tin-doped indium oxide, antimony-doped tin oxide, zinc antimonate, metal-doped tungsten oxide, a phthalocyanine compound, aluminum-doped zinc oxide, and lanthanum hexaboride.
16. The interlayer film for laminated glass according to claim 15 , wherein the metal-doped tungsten oxide is cesium-doped tungsten oxide.
17. The interlayer film for laminated glass according to claim 1 , wherein a UV absorber is contained in at least one of the layers constituting the interlayer film for laminated glass.
18. The interlayer film for laminated glass according to claim 17 , wherein the UV absorber is at least one compound selected from the group consisting of a benzotriazole-based compound, a benzophenone-based compound, a triazine-based compound, a benzoate-based compound, a malonic ester-based compound, and an oxalic anilide-based compound.
19. The interlayer film for laminated glass according to claim 1 , wherein a laminated glass in which the interlayer film for laminated glass is sandwiched between two glasses with the total thickness of the glasses being 4 mm or less has a haze of 5 or less.
20. A laminated glass, comprising the interlayer film for laminated glass according to claim 1 disposed between two glasses.