Low emissive coating compositions for camouflage, and products therefrom

Patent metadata

Field	Value
Publication number	US-12344767-B2
Application number	US-201917622966-A
Country	US
Kind code	B2
Filing date	Jun 28, 2019
Priority date	Jun 28, 2019
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

The present disclosure relates to a composition for providing a camouflage coating, the composition including an aqueous polyolefin binder dispersion; a low-emissive pigment; and a matting agent. The matting agent is a thermoplastic polymer matting agent. The disclosure further relates to a method of producing a low-emissive textile product using such a composition, as well as low-emissive textile products and camouflage products produced using the composition.

First claim

The invention claimed is:

1. A composition comprising:
a non-oxidized polyolefin binder dispersion;
a low-emissive pigment comprising a metal powder or metal flake; and
a matting agent;
wherein the matting agent is selected from the group consisting of hollow thermoplastic polymer microspheres, micronized polyolefin waxes, and calcium carbonate core and hydroxyapatite shell, wherein the matting agents defined in that when a test composition consisting of the matting agent and the non-oxidized polyolefin binder dispersion only is coated to an aluminium substrate to provide a test substrate, the resulting test substrate demonstrates an increase in average emissivity (Eavg) in the wavelength intervals 3-5 μm and 8-12 μm that is less than 0.15 as compared to a reference substrate consisting of an aluminium substrate coated with the on-oxidized polyolefin binder dispersion only;
wherein the said test composition comprises matting agent in quantities sufficient to ensure that the test substrate has a gloss value of less than 2 when measured at both 60° and 85° in accordance with the method as defined in ISO 2813:2014.

2. The composition according to claim 1 , wherein the matting agent is an expanded hollow thermoplastic polymer microsphere having a D50 particle size of from about 20 to about 30 μm.

3. The composition according to claim 1 , wherein the matting agent is an unexpanded hollow thermoplastic polymer microsphere-having a D50 particle size of from about 10 to about 20 μm.

4. The composition according to claim 1 , wherein the low-emissive pigment is an aluminium powder or aluminium flake.

5. The composition according to claim 1 , wherein the low-emissive pigment is treated to reduce specular reflection in the visible spectral range.

6. The composition according to claim 5 , wherein the low-emissive pigment is coated with a coating comprising a white pigment selected from the group consisting of titanium dioxide, barium sulfate, zinc oxide and zinc sulphide.

7. The composition according to claim 1 , further comprising a coloured pigment having low absorption in the thermal spectral range.

8. The composition according to claim 1 , wherein the non-oxidized polyolefin dispersion is a non-oxidized ethylene copolymer dispersion.

9. A method of producing a low-emissive textile product, the method comprising the steps of:
i) providing a textile substrate; and
ii) treating the textile substrate with a composition according to claim 1 .

10. The low-emissive textile product, produced by a method according to claim 9 , wherein the low-emissive textile product is a camouflage net, shelter or screen; or wherein the low-emissive textile product is a camouflaged garment.

11. A camouflage product comprising a low-emissive coating layer, the low-emissive coating layer comprising:
a non-oxidized polyolefin binder dispersion;
a low-emissive pigment comprising a metal powder or metal flake; and
a matting agent;
wherein the matting agent is selected from the group consisting of hollow thermoplastic polymer microspheres, micronized polyolefin waxes, and calcium carbonate core and hydroxyapatite shell, wherein the matting agents defined in that when a test composition consisting of the matting agent and the non-oxidized polyolefin binder dispersion only is coated to an aluminium substrate to provide a test substrate, the resulting test substrate demonstrates an increase in average emissivity (Eavg) in the wavelength intervals 3-5 μm and 8-12 μm that is less than 0.15 as compared to a reference substrate consisting of an aluminium substrate coated with the on-oxidized polyolefin binder dispersion only;
wherein the said test composition comprises matting agent in quantities sufficient to ensure that the test substrate has a gloss value of less than 2 when measured at both 60° and 85° in accordance with the method as defined in ISO 2813:2014.

12. The camouflage product according to claim 11 , wherein the low emissive coating layer comprises about 40% to about 50% of the non-oxidized polyolefin binder; about 10% to about 15% of the low-emissive pigment; and about 0.5% to about 12% of the matting agent, wherein all percentages are expressed in dry weight relative to the total dry weight of the coating layer.

13. The camouflage product according to claim 11 , wherein the coating layer has a gloss value of less than 2 when measured at a measurement angle of 85° using the method of ISO 2813:2014.

14. The camouflage product according to claim 11 , wherein the camouflage product is a camouflage net, shelter or screen; or wherein the camouflage product is a mobile camouflage; or a camouflaged garment.

Assignees

• Saab Ab

Inventors

• Kling Daniel
• Olovsson Ann-Sofie
• Boström Björn

Classifications

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C08K2003/0812

  Aluminium · CPC title

• C08K9/10

  Encapsulated ingredients · CPC title

• C08K7/22

  Expanded, porous or hollow particles · CPC title

• C09D7/42

  Gloss-reducing agents · CPC title