| CPC B32B 17/10761 (2013.01) [B32B 17/10 (2013.01); B32B 17/10036 (2013.01); B32B 2307/542 (2013.01)] | 7 Claims |
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1. An interlayer film for laminated glass having an average storage modulus (G′) at 110 to 150° C. measured at a frequency of 1 Hz in a shear mode of 15000 Pa or less, having a first glass transition temperature (Tg1) counted from the low temperature side in a temperature range of −50 to 150° C. of −50 to −19° C. and having an adhesive strength of 0.3 N/mm2 or more as measured in a cross peeling test performed under the following conditions on a cross peeling test sample obtained by carrying out, in order, a first process, a second process, and a third process,
wherein, in the first process, an interlayer film for laminated glass having a length of 15 mm and a width of 15 mm, a clear float plate glass having a thickness of 1.8 mm, a length of 25 mm, and a width of 100 mm in accordance with JIS 3202, and a polycarbonate plate glass having a thickness of 2 mm, a length of 25 mm and a width of 100 mm in accordance with JIS K6735 are provided, and the clear float plate glass and the polycarbonate plate glass are laminated in a cross shape via the interlayer film for laminated glass,
wherein, in the second process, using a spacer having the same thickness as the interlayer film for laminated glass so that the thickness of the interlayer film for laminated glass is constant, the clear float plate glass and the polycarbonate plate glass laminated via the interlayer film for laminated glass are temporarily bonded for 3 minutes under conditions of 60° C. and 0.1 MPa in a vacuum laminator,
wherein, in the third process, the temporarily bonded clear float plate glass and polycarbonate plate glass are then subjected to main pressure-bonding for 1 hour under conditions of 80° C. and 0.5 MPa; and
wherein, in the cross peeling test, a maximum load (N) when the polycarbonate plate glass is peeled from the clear float plate glass in a direction perpendicular to an adhesive surface at a rate of 10 mm/min at 23° C. is measured, and that measured maximum load (N) is taken as the adhesive strength.
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