US 12,479,005 B2
Functional film and method for producing same
Ryuji Hashimoto, Tokyo (JP); Toshihito Shimizu, Tokyo (JP); and Junya Yamada, Tokyo (JP)
Assigned to Dai Nippon Printing Co., Ltd., Tokyo (JP)
Appl. No. 18/565,645
Filed by DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
PCT Filed Jun. 10, 2022, PCT No. PCT/JP2022/023552
§ 371(c)(1), (2) Date Nov. 30, 2023,
PCT Pub. No. WO2022/260182, PCT Pub. Date Dec. 15, 2022.
Claims priority of application No. 2021-098273 (JP), filed on Jun. 11, 2021; application No. 2021-098276 (JP), filed on Jun. 11, 2021; and application No. 2022-070391 (JP), filed on Apr. 21, 2022.
Prior Publication US 2024/0139771 A1, May 2, 2024
Int. Cl. G02B 1/14 (2015.01); B05D 7/00 (2006.01)
CPC B05D 7/546 (2013.01) [G02B 1/14 (2015.01); B05D 2201/02 (2013.01); B05D 2401/40 (2013.01); B05D 2601/22 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A functional film comprising:
a substrate containing an acetyl cellulose resin;
a primer layer containing a filler and disposed on the substrate; and
a functional layer containing a filler and disposed on the primer layer,
wherein the substrate has a permeation layer adjacent to the primer layer and formed by permeation of a resin contained in the primer layer into part of the substrate, and the permeation layer has a thickness of 0.1 μm or more and 3.5 μm or less;
the primer layer has a thickness of 0.1 μm or more and 1.0 μm or less;
the filler in the primer layer and the filler in the functional layer are silica particles having an average particle size of 20 nm or more and 80 nm or less;
the filler in the primer layer has a density of ⅓ or more and ¾ or less of a density of the filler in the functional layer; and
the primer layer and the functional layer each contain a resin, and the primer layer has the same resin component as the functional layer.