| abstract |
(57) [Summary] [Object] To provide an interlayer film for laminated glass, which is excellent in sound insulation and has little optical distortion. [Structure] Polyvinyl butyral resin (a) (degree of acetalization: 60.2 mol%, amount of acetyl group: 11.9 mol%) 5 The kneaded product obtained by adding 0 g and 25 g of triethylene glycol di-2-ethylbutyrate was press-molded to give 0.15. A layer (A) having a thickness of mm is formed. A kneaded product obtained by adding 50 g of polyvinyl butyral resin (b) (acetalization degree: 66.3 mol%, acetyl group amount: 0.9 mol%) and 20 g of triethylene glycol di-2-ethylbutyrate was press-molded. A layer (B) having a thickness of 0.08 mm is formed. Layers (B) / layers (A) / layers (B) are laminated so that the pressure is 12 kg / cm 2 and the temperature is 135 ° C. in an autoclave. Press-bonded with, the interlayer film is layer (B) / layer (A) / layer (B) A transparent laminated glass having a structure of (layer thickness ratio: 0.15 / 0.08 / 0.15) is obtained. |