MULTILAYER INTERLAYER HAVING SOUND DAMPING PROPERTIES OVER A BROAD TEMPERATURE RANGE.

摘要

A polymer interlayer having improved sound insulation is disclosed. The polymer interlayer comprises at least one soft layer comprising a polyvinyl butyral) resin composition having a dispersity in composition of at least 0.40 and a plasticizer; and a stiff layer comprising a polyvinyl butyral) resin composition and a plasticizer; wherein the polymer interlayer has a damping loss factor (?·) (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.15 measured at two or more different temperatures selected from 10°C, 20°C and 30°C.