INTERLAYER FILM FOR LAMINATED GLASS AND LAMINATED GLASS Russian patent published in 2019 - IPC C03C27/12 B32B17/10 

FIELD: laminated products or materials.

SUBSTANCE: invention relates to an interlayer film for laminated glass. Interlayer film comprises at least two resin layers laid on top of one another. Layer has a large number of fine recesses and a large number of fine protrusions on at least one surface. Each resin layer comprises a first surface layer and a second surface layer. Interlayer film is maintained at 23 °C and relative humidity (RH) 30 % for three hours. Method then includes incision with a microtome at 23 °C and relative humidity of 30 % in the horizontal direction of the interlayer film in the area distant from the side of the first surface layer, 80-90 mcm from the interface between the first surface layer and the resin layer in contact with the inner side of the first surface layer and then in the area, distant, on the side of the second surface layer, 50 mcm from the cut surface to prepare resin film 1. Film 1 has a thickness of 50 mcm, after maintenance at a temperature of 23 °C and relative humidity of 30 % for three hours has surface roughness (Rz) when measured by the method in accordance with JIS B-0601 (1994) less than 2.5 mcm.

EFFECT: technical result is reduction of optical distortion.

7 cl, 4 dwg, 1 tbl