Durable extruded dyed polyester films

Patent metadata

Field	Value
Publication number	US-9630384-B2
Application number	US-201514640056-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Mar 7, 2014
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

The present disclosure relates to dyed polyester films whose color remains stable after prolonged exposure to UV radiation and to methods of making such dyed polyester films.

First claim

We claim:

1. An optically clear window film comprising
a clear first outer layer comprising polyethylene terephthalate (PET),
a core layer comprising PET and one or more dyes chosen from Pigment Yellow 147, Pigment Red 177, Pigment Blue 60, Pigment Black 31, Pigment Red 149, and Pigment Red 122, and
a clear second outer layer comprising PET,
wherein the one or more dyes are dissolved in the PET of the core layer,
wherein the window film is fade-resistant after more than 300 MJ/m 2 of total irradiance integrated over the band 295 nm to 385 nm and time.

2. The window film as claimed in claim 1 , wherein window film has a ΔEab* value of less than 6 after more than 300 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time.

3. The window film as claimed in claim 1 , wherein the ΔVLT of the window film is less than 5 after more than 300 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time.

4. The window film as claimed in claim 1 , wherein each of the first and second outer layers comprises no added dyes and no added pigments.

5. The window film as claimed in claim 1 , wherein the total concentration the dyes in the core layer is from 0.01 weight percent to 15 weight percent with respect to the composition of the core layer.

6. The window film as claimed in claim 1 , further comprising a clear hardcoat layer and/or a pressure-sensitive adhesive layer.

7. The window film as claimed in claim 1 , further comprising slip particles in at least one of the first or second outer layers.

8. The window film as claimed in claim 1 , wherein the haze of the window film is below 5%.

9. The window film as claimed in claim 1 , wherein each of the first and second outer layers, independently of each other, further comprises one or more UV stabilizers, and wherein the core layer further comprises one or more UV stabilizers.

10. The window film as claimed in claim 1 , wherein the first outer layer, the core layer, and the second outer layer are coextruded.

Assignees

• 3M Innovative Properties Co

Inventors

• Haak Christopher A
• Zoborowski Joseph M

Classifications

• B29K2995/0055

  Resistive to light · CPC title

• B32B2605/006

  Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings · CPC title

• C08K5/3465

  condensed with carbocyclic rings · CPC title

• C08K5/18

  with aromatically bound amino groups · CPC title

• C08L67/03

  the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings · CPC title