US 11,873,388 B2
Surface-treated fillers for polyester films
Michael Knerr, Oftringen (CH); Tazio Fornera, Zofingen (CH); Pierre Blanchard, Reyrieux (FR); Karsten Udo Schulz, Kriens (CH); Martin Brunner, Wallbach (CH); Sulejman Zendeli, Winterthur (CH); and Matthias Welker, Hésingue (FR)
Assigned to OMYA INTERNATIONAL AG, Oftringen (CH)
Appl. No. 17/053,779
Filed by OMYA INTERNATIONAL AG, Oftringen (CH)
PCT Filed May 15, 2019, PCT No. PCT/EP2019/062537
§ 371(c)(1), (2) Date Nov. 8, 2020,
PCT Pub. No. WO2019/224080, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 18173894 (EP), filed on May 23, 2018.
Prior Publication US 2021/0371624 A1, Dec. 2, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08K 9/04 (2006.01); B32B 27/20 (2006.01); B32B 27/36 (2006.01); C08J 5/18 (2006.01); C08K 3/26 (2006.01); B29C 48/08 (2019.01); B29C 55/04 (2006.01); C08J 3/22 (2006.01); B29C 48/00 (2019.01)
CPC C08K 9/04 (2013.01) [B32B 27/20 (2013.01); B32B 27/36 (2013.01); C08J 3/226 (2013.01); C08J 5/18 (2013.01); C08K 3/26 (2013.01); B29C 48/0018 (2019.02); B29C 48/08 (2019.02); B29C 55/04 (2013.01); B32B 2250/244 (2013.01); B32B 2264/104 (2013.01); B32B 2264/303 (2020.08); C08J 2467/02 (2013.01); C08K 2003/265 (2013.01); C08K 2201/005 (2013.01); C08K 2201/006 (2013.01)] 22 Claims
 
1. A mono or multi-layer polyester film, wherein at least one layer of the film comprises at least one polyester in an amount ranging from 70.0 to 99.9 wt.-% and a surface-treated filler material product in an amount ranging from 0.1 to 30.0 wt.-%, based on the total weight of the layer, wherein the surface-treated filler material product comprises
A) at least one ground calcium carbonate-comprising filler material having a weight median particle size d50 in the range from 0.5 μm to 3.0 μm, and
B) a treatment layer on the surface of the at least one ground calcium carbonate-comprising filler material comprising
i. at least one aliphatic aldehyde and/or salty reaction products thereof, and/or
ii. at least one mono-substituted succinic anhydride consisting of succinic anhydride mono-substituted with a group selected from a linear, branched, aliphatic and cyclic group having a total amount of carbon atoms from at least C2 to C30 in the substituent and/or salty reaction products thereof, and/or
iii. at least one polydialkylsiloxane, and/or
iv. mixtures of the materials according to i. to iii., wherein the surface-treated filler material product comprises the treatment layer in an amount of from 0.1 to 2.3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material.