Stabilized infrared absorbing dispersions

Patent metadata

Field	Value
Publication number	US-9903988-B2
Application number	US-201314651142-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Dec 11, 2012
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A dispersion, a resin containing the dispersion and polymer film formed from the resin are disclosed. The dispersion includes an infrared light absorbing pigment including organo-metallic particles being less than 1.5 micrometer or less than one micrometer in size. The dispersion also includes a dispersant including phosphorus and a polyol.

First claim

What is claimed is:

1. A polymer film comprising
an infrared light absorbing pigment dispersed in a polymer film layer, the infrared light absorbing pigment comprising organo-metallic particles, the infrared light absorbing pigment absorbs at a selected wavelength in a range of 750-1100 nm at least 1.5 times as strongly as in a visible range of 500-560 nm, at least 98% of the organo-metallic particles are less than 1.5 μm in size;
wherein the polymer film comprises a plurality of polyester film layers and a plurality of inner polyester film layers have an average thickness of less than 100 nm;
a dispersant comprising phosphorus; and
wherein the infrared light absorbing pigment comprises copper and phthalocyanine moieties.

2. The polymer film according to claim 1 , wherein the organo-metallic particles comprise Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Pd, Ag, Cd, Ta, W, Pt, or Au.

3. The polymer film according to claim 1 , wherein the polymer film layer comprises 0.02 to 1 wt % infrared light absorbing pigment.

4. The polymer film according to claim 1 , wherein the polymer film layer comprises a phthalocyanine synergist.

Assignees

• 3M Innovative Properties Co

Inventors

• Merrill William W
• Yust David T
• Crain Patrick M
• Sharma Neeraj
• Wu Jung Sheng

Classifications

• H04N23/56

  provided with illuminating means · CPC title

• G06K19/06103

  the marking being embedded in a human recognizable image, e.g. a company logo with an embedded two-dimensional code · CPC title

• G06K19/0614

  the marking being selective to wavelength, e.g. color barcode or barcodes only visible under UV or IR (methods or arrangements for sensing record carriers using a selected wavelength, see G06K7/12) · CPC title

• G09F3/10

  by an adhesive layer · CPC title

• G02B5/12

  Reflex reflectors · CPC title