Soft matte non-silicone film

Patent metadata

Field	Value
Publication number	US-12533870-B2
Application number	US-202318529157-A
Country	US
Kind code	B2
Filing date	Dec 5, 2023
Priority date	Jul 7, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

The present invention relates to a polymeric film, which may have but is not limited to Biaxially oriented polyester, polypropylene & polylactic acid that has a soft-touch matte coating applied via an in-line coating process. This film also has an increased coefficient of friction of this surface, with a total thickness from 5 to 80 μm. The film of this invention has excellent suitability as external packaging bags with an excellent matte appearance and soft haptic feel which, when the bags are stacked A side to A side (A side being coated), are not subject to slippage between the same. At the same time, this film has also low friction with metal, so it is easy to handle the film in the film making process which contributes to the excellent productivity.

First claim

What is claimed is:

1 . A film, comprising:
a layer comprising a core layer comprising a biaxially stretched layer comprising a polyester and a top layer on the core layer, wherein the top layer comprises urethane particles, polyvinyl pyrrolidone (PVP), and a crosslinker; and wherein the film further comprises a coating of a formulation comprising of a hot melt adhesive, wherein the hot melt adhesive has a cohesive split of approximately 50/50% within the film when approximately 1 gm of the film is coated with approximately 1/16 inch wide, approximately 0.25 g melt beads of the hot melt adhesive at approximately 370° F.

2 . The film of claim 1 , wherein a surface gloss of the film measured on the top layer at about 60° according to ASTM D523 is equal to about 4 to about 12.

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

4 . The film of claim 3 , wherein the polyurethane is in an amount of about 10 wt. % to about 40 wt. % based on total weight of the formulation.

5 . The film of claim 1 , wherein the PVP has a Fikentscher K value in a range of about 17 to about 90.

6 . The film of claim 1 , wherein the formulation further comprises a wax.

7 . The film of claim 6 , wherein the wax is in an amount of about 0.5 wt. % to about 3.5 wt. % of total weight of the formulation.

8 . The film of claim 1 , wherein the top layer further comprises silica.

9 . The film of claim 1 , wherein the top layer is free of silicone.

10 . The film of claim 1 , wherein the film further comprises a skin layer, wherein, the core layer is sandwiched between the top layer and the skin layer.

11 . The film of claim 1 , wherein the film has a haze greater than about 75% and less than about 90% as measured according ASTM D1003.

12 . The film of claim 10 , wherein a first composition of the skin layer and a second composition of the core layer are different.

13 . The film of claim 1 , wherein the film further comprises an adhesive layer.

14 . The film of claim 2 , wherein the surface gloss is less than about 10.

15 . The film of claim 1 , wherein the urethane particles have an average aspect ratio equal to or greater than about 1.5.

16 . The film of claim 1 , wherein the core layer further comprises crystalline propylene homopolymers and/or high crystalline polypropylene homopolymers (HCPP).

17 . The film of claim 1 , wherein the urethane particles comprise an aliphatic water-borne polyurethane.

18 . The film of claim 1 , wherein the film has a coefficient of static (μs) and a dynamic friction (μd) in a range of about 0.3 to about 1.0 as measured according to ASTM D1894.

19 . The film of claim 18 , wherein the film has a total thickness of about 5 μm to about 80 μm.

20 . The film of claim 1 , wherein the formulation further comprises a surfactant in an amount of about 0.1 wt. % to about 0.6 wt. %.

Assignees

• Toray Plastics America Inc

Inventors

• Paolilli Tracy
• Cloutier Joshua
• Abe Yu
• Hogan Samuel

Classifications

• B32B2307/746

  Slipping, anti-blocking, low friction · CPC title

• B32B2307/7376

  Thickness · CPC title

• B32B2307/518

  bi-axially · CPC title

• B32B2307/408

  Matt, dull surface · CPC title

• B32B2307/406

  Bright, glossy, shiny surface · CPC title