	US 12,486,432 B2
	Composite films with an obscuration area
Uwe Keller, Avon (FR); Martin Steuer, Liederbach (DE); Shinichi Muguruma, Okayama (JP); Hideki Oomoto, Okayama (JP); and Florian Mummy, Frankfurt am Main (DE)
Assigned to Kuraray Europe GmbH, Hattersheim (DE)
Appl. No. 18/028,237
Filed by KURARAY EUROPE GMBH, Hattersheim (DE)
PCT Filed Sep. 24, 2021, PCT No. PCT/EP2021/076320 § 371(c)(1), (2) Date Mar. 24, 2023, PCT Pub. No. WO2022/063962, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 20198614 (EP), filed on Sep. 28, 2020.
Prior Publication US 2023/0332020 A1, Oct. 19, 2023
Int. Cl. B32B 3/10 (2006.01); B32B 7/06 (2019.01); B32B 17/10 (2006.01); C09D 11/102 (2014.01); C09J 7/24 (2018.01)

CPC C09J 7/245 (2018.01) [B32B 7/06 (2013.01); B32B 17/10036 (2013.01); B32B 17/10275 (2013.01); B32B 17/10761 (2013.01); C09D 11/102 (2013.01); B32B 2250/04 (2013.01); B32B 2255/10 (2013.01); B32B 2255/26 (2013.01); B32B 2307/4023 (2013.01); B32B 2307/7376 (2023.05); B32B 2605/00 (2013.01)]

11 Claims

1. A composite film comprising:

a film A containing a polyvinyl acetal and optionally a plasticiser; and

a carrier film,

wherein film A is provided with an obscuration area,

wherein the obscuration area is provided by a printed or coated ink layer on the surface of film A not facing the carrier film,

wherein a surface roughness Rz of the surface of film A to be coated or printed is from 0.1 to 3.0 μm, measured before said surface is coated or printed on, and

wherein a surface roughness Rz of the carrier film on the surface in contact with film A is from 2.0 to 6.0 μm, measured before the carrier film and the film A come into contact.