In situ assembled crystalline colloidal arrays

Patent metadata

Field	Value
Publication number	US-2016297993-A1
Application number	US-201514682420-A
Country	US
Kind code	A1
Filing date	Apr 9, 2015
Priority date	Apr 9, 2015
Publication date	Oct 13, 2016
Grant date	—

Abstract

A dispersion of monodisperse similarly charged particles, the monodisperse particles having a maximum particle size dispersity of 10% and each particle having a surface with a minimum surface charge density of 1 μC/cm 2 and comprising pendant steric stabilizing groups.

First claim

The invention claimed is:

1 . A dispersion of monodisperse similarly charged particles, said monodisperse particles having a maximum particle size dispersity of 10% and each particle having a surface with a minimum surface charge density of 1 μC/cm 2 and comprising pendant steric stabilizing groups.

2 . The dispersion of claim 1 , wherein said pendant steric stabilizing groups comprise polymeric residues having a backbone chain of at least 10 atoms.

3 . The dispersion of claim 2 , wherein said pendant steric stabilizing groups comprise residues of polypropylene glycol, polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, poly(hydroxyethyl(meth)acrylate), poly(hydroxypropyl(meth)acrylate), polyacrylic acid, methacrylic acid, polyacrylamide, and/or poly(N-substituted acrylamide) and/or copolymers thereof.

4 . The dispersion of claim 1 , wherein said dispersion comprises a solvent.

5 . The dispersion of claim 4 , wherein said solvent comprises water and/or an organic compound.

6 . The dispersion of claim 1 , wherein at least some of said particles comprise a shell defining a hollow core.

7 . A coating composition comprising:
monodisperse particles, said particles each having a surface with a minimum surface charge density of 1 μC/cm 2 and comprising pendant steric stabilizing groups; and a resinous binder.

8 . The coating composition of claim 7 , further comprising a solvent.

9 . The coating composition of claim 7 , wherein the particles are self-assembled in crystalline colloidal arrays.

10 . The coating composition of claim 7 , wherein said pendant steric stabilizing groups comprise residues of polypropylene glycol, polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, poly(hydroxyethyl(meth)acrylate), poly(hydroxypropyl(meth)acrylate), polyacrylic acid, methacrylic acid, polyacrylamide, and/or poly(N-substituted acrylamide) and/or copolymers thereof.

11 . The coating composition of claim 7 , wherein the resinous binder comprises melamine resin.

12 . A method of applying a layer containing a crystalline colloidal array onto a substrate comprising:
depositing onto at least a portion of a substrate a composition comprising monodisperse particles, said monodisperse particles each having a surface, said surfaces bearing the same charge and having pendant steric stabilizing groups, wherein the monodisperse particles self-assemble into a crystalline colloidal array.

13 . The method of claim 12 wherein the particle surfaces have a minimum charge density of 1 μC/cm2.

14 . The method of claim 12 wherein said pendant steric stabilizing groups comprise residues of polypropylene glycol, polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, poly(hydroxyethyl(meth)acrylate), poly(hydroxypropyl(meth)acrylate), polyacrylic acid, methacrylic acid, polyacrylamide, and/or poly(N-substituted acrylamide) and/or copolymers thereof.

15 . The method of claim 12 wherein the coating composition further comprises a resinous binder.

16 . A method of coating a substrate comprising:
depositing onto at least a portion of a substrate the dispersion of particles of claim 1 to form a crystalline colloidal array layer; and depositing another coating composition onto at least a portion of the crystalline colloidal array layer.

17 . The method of claim 16 wherein the other coating composition is a clearcoat composition.

18 . The method of claim 16 further comprising depositing a first coating composition onto the substrate portion and depositing the dispersion of particles onto at least a portion of the first coating composition.

19 . The method of claim 16 wherein dispersion of particles further comprises a resinous binder.

20 . The method of claim 16 wherein said step of depositing the dispersion of particles comprises spraying the dispersion of particles.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Vanier Noel R
• Xu Xiangling
• Olson Kurt G
• Bohn Justin
• Donnelly John

Classifications

• C09D133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• C09D179/04 Primary

  Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• C09D7/00

  Features of coating compositions, not provided for in group C09D5/00 (driers C09F9/00); Processes for incorporating ingredients in coating compositions · CPC title

• C09D5/02 Primary

  Emulsion paints {including aerosols} · CPC title