MULTILAYERED FILM AND LAMINATED GLASS COMPRISING THE SAME

摘要

The present invention relates to a multilayered film comprising: a first external layer including a first polyvinylbutyral resin and a first additive; a second external layer opposed to the first external layer and including a second polyvinylbutyral resin and a second additive; and a middle layer interposed between the first external layer and the second external layer and including a third polyvinylbutyral resin and a third additive. A concentration of the third additive in the middle layer is higher than concentrations of the first additive in the first external layer and the second additive in the second external layer. The multilayered film of the present invention has improved optical properties and relevant adhesion, to be usefully used for laminated glass.