US 12,319,037 B2
Transparent polymer film with discoloration compensation
Jochen Münster, Zielebach (CH); and Adrian Wyss, Münsingen (CH)
Assigned to Klöckner Pentaplast GMBH, Heiligenroth (DE)
Filed by KLÖCKNER PENTAPLAST GMBH, Heiligenroth (DE)
Filed on Nov. 1, 2023, as Appl. No. 18/386,083.
Application 18/386,083 is a continuation of application No. 17/978,570, filed on Nov. 1, 2022, granted, now 11,858,241.
Application 17/978,570 is a continuation of application No. 17/059,340, granted, now 11,584,112, issued on Feb. 21, 2023, previously published as PCT/EP2019/063231, filed on May 22, 2019.
Claims priority of application No. 10 2018 112 817.7 (DE), filed on May 29, 2018.
Prior Publication US 2024/0083151 A1, Mar. 14, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. B32B 27/20 (2006.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01); C08J 5/18 (2006.01); C08K 5/00 (2006.01)
CPC B32B 27/20 (2013.01) [B32B 27/08 (2013.01); B32B 27/304 (2013.01); C08J 5/18 (2013.01); C08K 5/0041 (2013.01); B32B 2250/24 (2013.01); B32B 2250/40 (2013.01); B32B 2307/4026 (2013.01); B32B 2307/412 (2013.01); B32B 2307/732 (2013.01); B32B 2439/40 (2013.01); C08J 2327/08 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A single-layer or multilayer transparent film comprising one or more polymeric materials and one or more dyes,
wherein the film has CIE color values a* and b* of −7≤a*≤0 and −15≤b*≤0 and an optical transmission T of 60%≤T≤95%,
wherein the film comprises a blister film produced by thermoforming,
wherein the film comprises at least one supplementary dye, and
wherein a ratio of an integrated absorption of the one or more dyes in a wavelength range from 520 to 600 nm to an integrated absorption of the at least one supplementary dye in the wavelength range from 520 to 600 nm is from 4:1 to 1:1.