Stabilized infrared absorbing dispersions

Patent metadata

Field	Value
Publication number	US-10895673-B2
Application number	US-201815887051-A
Country	US
Kind code	B2
Filing date	Feb 2, 2018
Priority date	Dec 11, 2012
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

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 resin comprising:
a polyester material having a processing temperature of at least 250 degrees centigrade;
an infrared light absorbing pigment dispersed in the polyester material, the infrared light absorbing pigment comprising organo-metallic particles, the organo-metallic particles comprising metal and an organic moiety, the metal covalently bonded to one or more atoms of the organic moiety, 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 micrometer in size; and
a dispersant comprising phosphorus;
wherein the resin comprises the pigment in an amount above its solubility limit.

2. The resin 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 resin according to claim 1 , wherein the at least 98% of the organo-metallic particles have a size in a range from 100 nm to 1000 nm.

4. The resin according to claim 1 , wherein the infrared light absorbing pigment comprises copper.

5. The resin according to claim 1 , wherein the infrared light absorbing pigment comprises phthalocyanine moieties.

6. The resin according to claim 1 , wherein the resin comprises 0.01 to 5 wt % infrared light absorbing pigment.

7. The resin according to claim 1 , wherein the resin comprises a phthalocyanine synergist.

8. The resin according to claim 1 , wherein the polyester material has a processing temperature of at least 280 degrees centigrade.

9. The resin according to claim 8 wherein the polyester material comprises polyethylene terephthalate, copolyethylene terephthalate or copolyethylene naphthalate.

10. The resin according to claim 1 , wherein the resin further comprises poly(methyl methacrylate), syndiotactic polystyrene, polycarbonate or polyethylene terephthalate-polycarbonate alloys.

11. A polymer melt comprising:
a polyester material;
an infrared light absorbing pigment dispersed in the polyester material, the infrared light absorbing pigment comprising organo-metallic particles, the organo-metallic particles comprising metal and an organic moiety, the metal covalently bonded to one or more atoms of the organic moiety, 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 micrometer in size; and
a dispersant comprising phosphorus;
wherein the polymer melt is at a temperature of at least 250 degrees centigrade.

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

• G02B5/223 Primary

  containing organic substances, e.g. dyes, inks or pigments · 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

• G09F13/16

  Signs formed of or incorporating reflecting elements or surfaces, e.g. warning signs having triangular or other geometrical shape · CPC title