| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer intermediate layer reducing the level of outside noise passed through a laminated glass as a final product.SOLUTION: A poly(vinyl butyral) multilayer intermediate layer reduces sound volume passed through a panel and on the other hand, and also supplies a colored region in a gradient region, in use of a multilayer glass panel-type one. Sound effect is attained by using two or more polymer sheets which have different compositions and are combined as a single multilayer intermediate layer. At least one gradient region of each layer includes the colored region. The colored region has a total alkali titer concentration lower than the total alkali titer of a transparent region of a layer where the colored region is formed, by at least 4 titer concentration. |
