| 摘要 |
PURPOSE: An agricultural film for protecting damage by disease and insect pest is provided, by increasing the ratio of blue light/UV and thereby suppressing the sporulation of fungi. CONSTITUTION: A film comprises three or more layers, for example an outer layer, a middle layer and an inner layer, wherein one or more layers among the layers contain 0.1-1.0 percent by weight of blue emitting agent being bis benzoazoles such as 2,2-(1,2-ethylenediyldi-4,1-phenylene)bisbenzoxazole. Preferably the blue emitting agent is contained in the outer layer and/or the middle layer. The resin of the outer layer is preferably ethylene vinyl acetate(EVA) (The melting index (MI) is 0.1-1.0 g/10min, and the content of vinyl acetate(VA) is 0.5-10 %), or low density polyethylene(LDPE) (The MI is 0.1-2.0 g/10min, and the density is 0.920-0.928 g per square meter). The resin of the middle layer and the inner layer is preferably EVA whose MI is 0.1-2.0 g/10min and that the content of VA is 3-20%. Preferably the layers contains additional additives, for example the outer layer contains an anti blocking agent and antioxidant, the middle layer contains a misting agent, an antioxidant and a UV stabilizer, and the inner layer contains a misting agent, an antioxidant and a UV stabilizer.
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