▎ 摘　　要

NOVELTY - Film, comprises an optical film sequentially comprising from top to bottom a first protective layer (1), a first reflective layer (2), a first base material layer (3), a polymer dispersed liquid crystal layer (4), a second base material layer (5), a second reflective layer (6) and a second protective layer (7), where the thickness of the first reflective layer and the second reflective layer are respectively 1-10 µm, the thickness of the first substrate layer and the second substrate layer are respectively 10-200 µm, the thickness of the first protective layer and the second protective layer are respectively 1-10 µm. USE - The film is useful for preventing bird collision. ADVANTAGE - The film can be distinguished when attached on the glass, and hence avoids the occurrence of bird collision event, has improved reflectivity without affecting the visual effect of the human, and ensures privacy function. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the film, comprising: (i) preparing coating material of the first reflective layer and the second reflective layer, where the components of the coating material comprise polymerizable liquid crystal material, chiral agent, photoinitiator and solvent; (ii) respectively coating the coating material on the first base material layer and the second base material layer, drying, and curing to form the first reflective layer on the first base material layer and second reflective layer on the second base material layer; (iii) coating and forming the first protective layer on the first reflective layer to form a first pre-processed film, and coating the second protective layer on the second reflective layer to form a second pre-processed film; and (iv) respectively bonding the first base material layer of the first pre-processed film, and the second base material layer of the second pre-processed film to the two ends of the polymer dispersed liquid crystal, and curing. DESCRIPTION OF DRAWING(S) - The drawing shows a structural schematic diagram of film for preventing bird collision. 1First protective layer 2First reflective layer 3First base material layer 4Polymer dispersed liquid crystal layer 5Second base material layer 6Second reflective layer 7Second protective layer