Durable printable label film

Patent metadata

Field	Value
Publication number	US-12404401-B2
Application number	US-202217889765-A
Country	US
Kind code	B2
Filing date	Aug 17, 2022
Priority date	Aug 18, 2021
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

Embodiments relate to a film comprising a base layer comprising a biaxially oriented polypropylene (BOPP); a coating layer comprising a polyester, an acrylic, and a crosslinker; and a primer; wherein the film has a haze change, measured according to ASTM D1003, before exposure to boiling water for 30 minutes and after exposure to boiling water for 30 minutes of 4 units or less.

First claim

What is claimed is:

1. A film comprising:
a base layer comprising a biaxially oriented polypropylene (BOPP);
a coating layer comprising a polyester, an acrylic, and a crosslinker; and
a primer;

wherein the film has a haze change, measured according to ASTM D1003, before exposure to boiling water for 30 minutes and after an exposure to boiling water for 30 minutes of 4 units or less;
wherein according to FTIR the film has a first absorbance at a first wavelength of 1380 cm −1 higher than a second absorbance at a second wavelength of 1150 cm −1 and a third absorbance at a third wavelength of a 1450 cm −1 wavelength; and
wherein the third absorbance is higher than a fourth absorbance at a fourth wavelength of 1730 cm −1 .

2. The film of claim 1 , wherein the primer is included in the coating layer.

3. The film of claim 1 , wherein the primer produces a higher adhesion between the base layer and the coating layer under moist, warm and sterilization conditions as compared to a comparable film having a composition as that of the film but not containing the primer.

4. The film of claim 1 , wherein the film has a high crystallinity in a range of about 90-99% isotactic index.

5. The film of claim 1 , wherein the base layer comprises a print receptive layer, a core layer, and an adhesive receptive layer.

6. The film of claim 5 , wherein the core layer comprises polypropylene.

7. The film of claim 5 , wherein the print receptive layer comprises a first component for wettability of a coating adhesive and a second component to form an affinity with the BOPP of the core layer.

8. The film of claim 7 , wherein the first component comprises maleic anhydride grafted polypropylene (MAH-g-PP).

9. The film of claim 5 , wherein the print receptive layer comprises maleic anhydride grafted polypropylene (MAH-g-PP), homopolymer polypropylene (HOPP), or a copolymer polypropylene (COPP).

10. The film of claim 5 , wherein the adhesive receptive layer comprises a copolymer polypropylene (COPP) and HOPP.

11. The film of claim 5 , wherein the base layer comprises about 2% to about 4% by weight of the print receptive layer, about 92% to about 96% by weight of the core layer, and about 2% to about 4% by weight of the adhesive receptive layer, wherein all weights are based on a total weight of the base layer.

12. The film of claim 1 , wherein the film further comprises a barrier layer comprising maleic anhydride and a polyolefin.

13. The film of claim 12 , wherein an adhesive layer is between the barrier layer and a core layer.

14. The film of claim 13 , wherein the adhesive layer comprises maleic anhydride and a polyolefin.

15. The film of claim 1 , wherein the coating layer comprises polyurethane.

16. The film of claim 1 , wherein the primer comprises polyurethane.

17. The film of claim 1 , wherein the crosslinker comprises carbodiimide, melamine or aziridine.

18. The film of claim 1 , wherein the film further comprises silica particles.

19. The film of claim 1 , wherein the film is configured to be printable using an ink.

20. The film of claim 19 , wherein the ink is selected from a waterborne ink, a UV borne ink, or a solvent borne ink.

Assignees

• Toray Plastics America Inc

Inventors

• Paolilli Tracy
• Cloutier Joshua
• Abe Yu

Classifications

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• B32B2519/00

  Labels, badges · CPC title

• B32B2307/518

  bi-axially · CPC title

• B32B2307/704

  Crystalline · CPC title

• B32B2307/75

  Printability · CPC title