Patent ID: 11873388
Assignee: OMYA INTERNATIONAL AG
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
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.