Surface-treated fillers for polyester films

Patent metadata

Field	Value
Publication number	US-11873387-B2
Application number	US-201716472856-A
Country	US
Kind code	B2
Filing date	Dec 19, 2017
Priority date	Dec 21, 2016
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A mono or multi-layer polyester film is described. Also described, is a process for producing the mono or multi-layer polyester film, the use of a surface-treated filler material product as a voiding agent in the mono or multi-layer polyester film, and an article including the mono or multi-layer polyester film. Further, use of the mono or multi-layer polyester film is described in packaging products, insulating materials, solar, marine or aviation applications, science, electronic or acoustic applications, wires, cables, radio frequency identifications, flexible circuits, graphic arts, stone paper, holograms, filter products, cosmetic products, household products, imaging, recording media, or industrial products.

First claim

The invention claimed is:

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 20.0 wt.-% to <70 wt.-% and a surface-treated filler material product in an amount ranging from >30 wt.-% to 80.0 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 d 50 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, wherein the treatment layer comprises
i. at least one aliphatic aldehyde and/or a salty reaction product thereof, and/or
ii. at least one mono-substituted succinic anhydride and/or a salty reaction product thereof, wherein the mono-substituted succinic anhydride comprises a succinic anhydride mono-substituted with a substituent that is a linear, branched, aliphatic or cyclic group having a total number of carbon atoms from at least C 2 to C 30 in the substituent, 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 wt.-% to 2.3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material.

2. The mono or multi-layer polyester film of claim 1 , wherein the at least one polyester and surface-treated filler material product comprising layer of the film comprises the surface-treated filler material product in an amount ranging from 30.01 wt.-% to 80.0 wt.-%, based on the total weight of the layer.

3. The mono or multi-layer polyester film of claim 1 , wherein the at least one polyester is selected from the group consisting of polyglycolic acid (PGA), polylactic acid (PLA), polycaprolactone (PCL), polyhydroxybutyrate (PHB), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polyethylene furanoate (PEF), bio-based polyesters, polyester-recycling materials and mixtures thereof.

4. The mono or multi-layer polyester film of claim 1 , wherein the at least one polyester and surface-treated filler material product comprising layer of the film comprises the at least one polyester in an amount ranging from 20.0 wt.-% to 69.99 wt.-%, based on the total weight of the layer.

5. The mono or multi-layer polyester film of claim 1 , wherein the at least one ground calcium carbonate-comprising filler material is a wet or dry ground calcium carbonate-comprising filler material and optionally is a wet ground calcium carbonate-comprising filler.

6. The mono or multi-layer polyester film of claim 1 , wherein the at least one ground calcium carbonate-comprising filler material is natural ground calcium carbonate, precipitated calcium carbonate, modified calcium carbonate, surface-treated calcium carbonate, or a mixture thereof.

7. The mono or multi-layer polyester film of claim 1 , wherein the at least one ground calcium carbonate-comprising filler material has
a) a weight median particle size d 50 from 0.5 μm to 2.5 μm, and/or
b) a top cut particle size d 98 of ≤15 μm, and/or
c) a fineness such that at least 15 wt.-%, of all particles have a particle size of <0.5 μm, and/or
d) a specific surface area (BET) of from 0.5 m 2 /g to 150 m 2 /g, as measured using nitrogen and the BET method according to ISO 9277.

8. The mono or multi-layer polyester film of claim 1 , wherein the treatment layer on the surface of the at least one ground calcium carbonate-comprising filler material comprises at least one aliphatic aldehyde and/or a salty reaction product thereof.

9. The mono or multi-layer polyester film of claim 1 , wherein the surface-treated filler material product comprises the treatment layer in an amount of from 0.2 wt.-% to 2.0 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material.

10. The mono or multi-layer polyester film of claim 1 , wherein the at least one polyester and surface-treated filler material product comprising layer of the film further comprises a thermoplastic polymer.

11. The mono or multi-layer polyester film of claim 10 , wherein the at least one polyester and surface-treated filler material product comprising layer of the film comprises the thermoplastic polymer in a range of from 0.1 wt.-% to 29.9 wt. %, based on the total weight of the layer.

12. The mono or multi-layer polyester film of claim 1 , wherein the film or the at least one polyester and surface-treated filler material product comprising layer, has
a) a density in a range of from 1.8 g/cm 3 to 2.4 g/cm 3 , and/or
b) an opacity of ≥50%.

13. The mono or multi-layer polyester film of claim 1 , wherein the at least one polyester and surface-treated filler material product comprising layer of the film further comprises an inorganic filler material different from the surface-treated filler material product.

14. The mono or multi-layer polyester film of claim 1 , wherein the film or the at least one polyester and surface-treated filler material product comprising layer, comprises an additive selected from the group consisting of light stabilizers, optionally 2-hydroxybenzophenones, 2-hydroxybenzotriazoles, organonickel compounds, salicylic esters, cinnamic ester derivatives, resorcinol monobenzoates, oxanilides, hydroxybenzoic esters, sterically hindered amines and triazines, hydroxy-phenyl-triazin, optical brightener, blue dyes, blue dyes soluble in polyester, antiblocking agents, white pigments and mixtures thereof.

15. The mono or multi-layer polyester film of claim 1 , wherein the film is a cast film, a blown film, a double bubble film or a mono axially oriented polyester film.

16. A process for producing the mono or multi-layer polyester film as defined in claim 1 , the process comprising the steps of:
a) providing a composition comprising at least one polyester and a surface-treated filler material product, and
b) forming a film from the composition of step a),

wherein the surface-treated filler material product comprises
A) at least one ground calcium carbonate-comprising filler material having a weight median particle size d 50 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, wherein the treatment layer comprises:
(i) at least one aliphatic aldehyde and/or a salty reaction product thereof, and/or
(ii) at least one mono-substituted succinic anhydride and/or a salty reaction product thereof, wherein the mono-substituted succinic anhydride comprises a succinic anhydride mono-substituted with a substituent that is a linear, branched, aliphatic or cyclic group having a total number of carbon atoms from at least C 2 to C 30 in the substituent, 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 wt.-% to 2.3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material.

17. The process of claim 16 , wherein the composition provided in step a) is a masterbatch obtained by mixing and/or kneading the at least one polyester and the surface-treated filler material product to form a mixture and continuously pe

Assignees

• Omya Int Ag

Inventors

• Brunner Martin
• Knerr Michael
• Tinkl Michael
• Schulz Karsten Udo

Classifications

• C08K9/04 Primary

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• B29C48/08

  flexible, e.g. films · CPC title

• B29C48/305

  having a wide opening, e.g. for forming sheets · CPC title

• B29C48/914

  Cooling drums · CPC title