INTERMEDIATE FILM FOR SOUND INSULATING LAMINATED GLASS

摘要

PURPOSE:To offer an intermediate film for sound insulating laminated glass which prevents reduction of TL value by relaxing the coincidence effect without damaging the basic characteristics required for laminated glass and stably shows excellent sound insulating performance in a wide temp. range for a long period. CONSTITUTION:The intermediate film for sound insulating laminated glass of the above film consists of laminated films of two kinds of resin films (A), (B). These films consist of polyvinyl-acetals obtd. from two kinds of aldehydes having 6-10 carbon number and 1-4 carbon number. Or the film consists of a mixture of these two polyvinyl-acetal resins.