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 wherein the soft layer comprises a blend of a first poly(vinyl butyral) resin, a second poly(vinyl butyral) resin and a plasticizer; at least one stiffer layer comprising a third poly(vinyl butyral resin) and a plasticizer, wherein the polymer interlayer has a damping loss factor (η) (as measured by Mechanical Impedance Measurement according to ISO 16940) of at least about 0.16 measured at two or more different temperatures selected from 10° C., 20° C. and 30° C.

主权项

1. A polymer interlayer having improved sound insulation, the polymer interlayer comprising:
at least one soft layer wherein the soft layer comprises a blend of two or more poly(vinyl butyral) resins comprising: a first poly(vinyl butyral) resin having a first residual hydroxyl content and a first glass transition temperature (Tg); a second poly(vinyl butyral) resin having a second residual hydroxyl content and a second glass transition temperature (Tg), wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 1.0 weight percent; a plasticizer, wherein the first poly(vinyl butyral) resin, the second poly(vinyl butyral) resin and the plasticizer are mixed and melt-extruded to form the at least one soft layer; at least one stiffer layer comprising a third poly(vinyl butyral) resin having a third residual hydroxyl content; and a plasticizer, wherein the difference between the third residual hydroxyl content and at least one of the first residual hydroxyl content and the second residual hydroxyl content is at least 2.5 weight percent.