Aqueous dispersions

Patent metadata

Field	Value
Publication number	US-2025270373-A1
Application number	US-202519061324-A
Country	US
Kind code	A1
Filing date	Feb 24, 2025
Priority date	Feb 28, 2024
Publication date	Aug 28, 2025
Grant date	—

Abstract

Conductive aqueous dispersions for application as coatings, and methods for producing conductive aqueous dispersions are provided. In an embodiment, a method for producing a conductive aqueous dispersion includes mixing water, solvent, and binder to form a homogenous mixture. Further, the method includes adding carbon nanotubes to the homogenous mixture and mixing at high shear to form the dispersion.

First claim

What is claimed is:

1 . A method for producing a conductive aqueous dispersion, the method comprising:
mixing water, solvent, and binder to form a homogenous mixture; and adding carbon nanotubes to the homogenous mixture and mixing at high shear to form the dispersion.

2 . The method of claim 1 wherein the carbon nanotubes are conductive, and wherein the dispersion includes from about 5 to about 20% conductive material based on total binder solids.

3 . The method of claim 1 wherein the carbon nanotubes are conductive, and wherein the dispersion includes from about 10 to about 15% conductive material based on total binder solids.

4 . The method of claim 1 wherein the dispersion is formed with a carbon nanotube content of about 0.5 to about 2.5 wt. %, based on the total weight of the dispersion.

5 . The method of claim 1 wherein the dispersion is formed with a carbon nanotube content of about 1.0 to about 1.8 wt. %, based on the total weight of the dispersion.

6 . The method of claim 1 wherein the dispersion is formed by:
grafting a first acrylic resin component and a polyester resin component to one another; and
grafting a second acrylic resin component and a urethane resin component to one another.

7 . The method of claim 1 , wherein the dispersion is formed with:
a total acrylic resin content of about 5 to 8.2 wt. %; a total polyester resin content of about 1 to about 6.2 wt. %; a total urethane resin content of up to about 3.7 wt. %

8 . The method of claim 1 wherein the dispersion is formed with a binder content of about 16 to about 33 wt. %, based on the total weight of the dispersion.

9 . The method of claim 1 wherein the binder comprises:
acrylic resin;
polyester resin;
urethane resin; and
melamine formaldehyde resin.

10 . The method of claim 1 , wherein the dispersion is formed with:
an acrylic resin content of about 5 to 8.2 wt. %; a polyester resin content of about 1 to about 6.2 wt. %; a urethane resin content of about 0.0 to 3.7 wt. %; and a melamine formaldehyde resin content of about 2.5 to about 2.8 wt. %; based on the total weight of the dispersion.

11 . The method of claim 1 , further comprising mixing filler with the water, solvent, and binder to form the homogenous mixture.

12 . The method of claim 11 , wherein the filler is magnesium silicate.

13 . The method of claim 11 , wherein the dispersion is formed with a filler content of about 5 to about 10 wt. %, based on the total weight of the dispersion.

14 . The method of claim 1 , further comprising mixing defoamer with the water, solvent, and binder to form the homogenous mixture.

15 . The method of claim 14 , wherein the dispersion is formed with a defoamer content of about 0.2 to about 0.5 wt. %, based on the total weight of the dispersion.

16 . The method of claim 1 , further comprising mixing neutralizing agent with the water, solvent, and binder to form the homogenous mixture.

17 . The method of claim 16 , wherein the neutralizing agent is amine.

18 . The method of claim 16 , wherein the dispersion is formed with a neutralizing agent content of about 0.05 to about 0.25 wt. %, based on the total weight of the dispersion.

19 . A conductive aqueous dispersion comprising:
water; solvent; binder; and carbon nanotubes; wherein the carbon nanotubes are conductive, and wherein the dispersion includes from about 5 to about 20% conductive material based on total binder solids.

20 . The conductive aqueous dispersion of claim 19 , wherein the dispersion has:
a carbon nanotube content of about 0.5 to about 2.5 wt. %, based on the total weight of the dispersion; a water content of about 50 to about 70 wt. %, based on the total weight of the dispersion; a solvent content of about 4 to about 8 wt. %, based on the total weight of the dispersion; and a binder content of about 16 to about 33 wt. %, based on the total weight of the dispersion.

Assignees

• Axalta Coating Systems Ip Co

Inventors

• Istivan Stephen
• Flosbach Carmen
• Houze Eric C
• Laplante Sylas

Classifications

• C09D167/00

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• C08L61/28

  with melamine · CPC title

• C09D133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08F220/14

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C08L75/04

  Polyurethanes · CPC title