Patent ID: 7214433

Claim:
A laminate article comprising (A) two layers of soft plasticized polyvinylbutyral interlayer sheet having a T g in the range of from about 32° C. to about 35° C., and (B) a stiff polyvinylbutyral interlayer sheet, wherein the stiff polyvinylbutyral interlayer sheet: (i) has a T g of from about 35° C. to about 60°°C.; (ii) is positioned between the two layers of soft polyvinylbutyral sheet; and (iii) comprises a bleaching compound in an amount of from about 0.01 to about 0.85 pph, based on weight of polyvinyl alcohol used in the preparation of the polyvinylbutyral used to prepare the stiff polyvinylbutyral interlayer sheet.