Patent ID: 7842395
Filing Date: 2010-11-30
Classification: B32B,Y10T

Abstract:
1. A poly(vinyl butyral) interlayer comprising: a single poly(vinyl butyral) sheet, including: a first plasticized poly(vinyl butyral) layer having a first gradient region and a first clear region; a second plasticized poly(vinyl butyral) layer having a second gradient region and a second clear region; a third plasticized poly(vinyl butyral) layer having a third gradient region and a third clear region; wherein the amount of plasticizer in said second layer is at least 10 parts per hundred greater than the amount of plasticizer in said first layer, and wherein said first layer and said second layer each have a residual acetate content of less than 5 mol percent; wherein the amount of plasticizer in said second layer is at least 10 parts per hundred greater than the amount of plasticizer in said third layer, and wherein said third layer and said second layer each have a residual acetate content of less than 5 mol percent; wherein at least one of said first gradient region, said second gradient region and said third gradient region has a colored region; and, wherein said colored region has a total alkaline titer that is at least 4 titers less than the total alkaline titer of the clear region of the layer in which it is formed.