Patent ID: 9573329
Date: 2017-02-21
CPC Classifications: B29D,B29K,B32B,C03C,C08J,C08K,C09J

Claim:
1. An interlayer comprising: a first resin layer comprising a first poly(vinyl acetal) resin and a first plasticizer; and a second resin layer adjacent to said first resin layer, wherein said second resin layer comprises a second poly(vinyl acetal) resin and a second plasticizer, wherein said second poly(vinyl acetal) resin comprises at least 0.5 weight percent of residues of an aldehyde having a refractive index of at least 1.421 based on the total weight of the aldehyde residues of said second poly(vinyl acetal) resin, wherein said second poly(vinyl acetal) resin further comprises at least 10 weight percent of residues of at least one other aldehyde selected from the group consisting of n-butyraldehyde, iso-butyraldehyde, 2-ethylhexanal, based on the total weight of aldehyde residues of said second poly(vinyl acetal) resin, and wherein the refractive index of said first resin layer is not more than 0.010 higher than the refractive index of said second resin layer and wherein said interlayer has a damping loss factor (as measured by ISO 16940) of at least 0.10 at 20° C.