Patent ID: 8197929

Claim:
An aliphatic polyester based resin reflection film comprising: an aliphatic polyester based resin; and a fine powder filler, wherein the fine powder filler has a refractive index of 1.6 or more, wherein a content of the fine powder filler is 10 mass parts or more and 60 mass parts or less per 100 mass parts of the aliphatic polyester based resin composition comprising the fine powder filler and the aliphatic polyester based resin, wherein the aliphatic polyester based resin is a polylactic, acid based resin having a compositional ratio of D-lactic acid to L-lactic acid such that D-lactic acid:L-lactic acid=99.5:0.5 to 95:5 or D-lactic acid:L-lactic acid=0.5:99.5 to 5:95, wherein the film has pores therein at a porosity of 5% or more and 50% or less, and wherein the aliphatic polyester based resin has a refractive index of less than 1.50, and wherein the film has an average reflectance of 95% or more at a wavelength in the range of 420 nm to 700 nm.