Patent ID: 8404351
Filing Date: 2013-03-26
Classification: B32B,Y10T

Abstract:
1. An interlayer film for a laminated glass, comprising: a sound insulation layer 1; a middle layer; and a sound insulation layer 2, being laminated in this order, wherein the sound insulation layer 1, the middle layer and the sound insulation layer 2 each contain a polyvinyl acetal resin and a plasticizer, wherein: an amount of the plasticizer per 100 parts by weight of the polyvinyl acetal resin in the sound insulation layer 1 is different by from 5 to 60 parts by weight from an amount of the plasticizer per 100 parts by weight of the polyvinyl acetal resin in the sound insulation layer 2, the polyvinyl acetal resin contained in sound insulation layer 1 and sound insulation layer 2 contains only an acetal group having 4 carbon atoms as an acetal group, and an amount of acetyl groups in the polyvinyl acetal resin contained in each of the sound insulation layer 1 and the sound insulation layer 2 is larger than an amount of acetyl groups in the polyvinyl acetal resin contained in the middle layer.