Laminated reflective film having reduced alkali metal or alkaline earth metal to polyvinyl alcohol resin ratio
Abstract:
To provide a laminated reflective film having excellent discoloration resistance and adhesion between refractive index layers.A laminated reflective film including a substrate and a reflective layer including a high refractive index layer and a low refractive index layer disposed on the substrate, wherein at least one of the high refractive index layer and the low refractive index layer includes a polyvinyl alcohol resin, metal oxide particles, and a first metal ion formed of an alkali metal ion and/or an alkaline earth metal ion, and the content ratio of the first metal ion represented by the following Formula (1): content ⁢ ⁢ ratio ⁢ ⁢ of ⁢ ⁢ first ⁢ ⁢ metal ⁢ ⁢ ion = content ⁢ ⁢ of ⁢ ⁢ first ⁢ ⁢ metal ⁢ ⁢ ion content ⁢ ⁢ of ⁢ ⁢ polyvinyl ⁢ ⁢ alcohol ⁢ ⁢ resin × 100 ( 1 ) is 1.25 or less.
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