# US 2008/0188381 A1 · Particles with high surface charge for crystalline colloidal arrays

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- Number: US 2008/0188381 A1
- Document ID: US20080188381A1
- Status: Published application
- Kind: A1
- Application number: 11/672,237
- Filed: 2007-02-07
- Published: 2008-08-07
- Earliest claimed: 2007-02-07
- Assignees: PPG Industries Ohio, Inc.
- Inventors: Xiangling Xu; Sean Purdy
- Web page: https://patentgrep.com/patent/US20080188381A1

## CPC

- B01J 13/14: Polymerisation; cross-linking
- C08F 212/08: Styrene
- C08F 257/02: on to polymers of styrene or alkyl-substituted styrenes
- C30B 5/00: Single-crystal growth from gels (under a protective fluid C30B27/00)
- C08F 12/30: Sulfur
- C08F 212/30: {Sulfur}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C30B: SINGLE-CRYSTAL GROWTH (by using ultra-high pressure, e.g. for the formation of diamonds, B01J3/06); UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL (zone-refining of metals or alloys C22B); PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE (casting of metals, casting of other substances by the same processes or devices B22D; working of plastics B29; modifying the physical structure of metals or alloys C21D, C22F); SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE (for producing semiconductor devices or parts thereof H10); APPARATUS THEREFOR

## Abstract

A method of preparing a dispersion of polymeric particles is disclosed. Monomers are emulsion polymerized in the presence of an ionic monomer to produce highly charged polymeric particles. At least 50% of the ionic monomer in the dispersion is bound to the polymeric particles.

## Claims

### Claim 1

A method of preparing a dispersion of monodispersed polymeric particles comprising:
dispersing monomers in an emulsion containing an ionic monomer; and
polymerizing the monomers to produce monodispersed polymeric particles wherein at least 50% of the ionic monomer in the dispersion is bound to the polymeric particles.

### Claim 2 (depends on 1)

The method of claim 1, wherein at least 70% of the ionic monomer in the dispersion is bound to the polymeric particles,

### Claim 3 (depends on 1)

The method of claim 1, wherein at least 90% of the ionic monomer in the dispersion is bound to the polymeric particles.

### Claim 4 (depends on 1)

The method of claim 1, wherein said ionic monomer comprises sodium styrene sulfonate.

### Claim 5 (depends on 4)

The method of claim 4, wherein said polymeric particles comprise polystyrene, an acrylic polymer, polyurethane, an alkyd polymer, a polyester, a siloxane-containing polymer, a polysulfide, and/or an epoxy-containing polymer.

### Claim 6 (depends on 1)

The method of claim 1, wherein said polymeric particles comprise polystyrene, an acrylic polymer, polyurethane, an alkyd polymer, a polyester, a siloxane-containing polymer, a polysulfide, and/or an epoxy-containing polymer.

### Claim 7 (depends on 1)

The method of claim 1, wherein said polymeric particles have a core-shell structure.

### Claim 8 (depends on 1)

A method of preparing an ordered periodic array of particles comprising:
preparing a dispersion of particles according to claim 1; and
applying the dispersion onto a substrate, whereby the particles self-align into an ordered periodic array.

### Claim 9 (depends on 8)

The method of claim 8, further comprising coating the array of particles with a matrix and curing the matrix to fix the array of particles within the matrix.

### Claim 10 (depends on 9)

The method of claim 9, wherein the particles comprise polystyrene, an acrylic polymer, polyurethane, an alkyd polymer, a polyester, a siloxane-containing polymer, a polysulfide, and/or an epoxy-containing polymer.

### Claim 11 (depends on 10)

The method of claim 10, wherein the particles have a core-shell structure.

### Claim 12 (depends on 10)

The method of claim 10, wherein the matrix comprises an acrylic polymer, polyurethane, an alkyd polymer, a polyester, a siloxane-containing polymer, a polysulfide, and/or an epoxy-containing polymer.

### Claim 13 (depends on 8)

The method of claim 8, wherein said ionic monomer comprises sodium styrene sulfonate.

### Claim 14 (depends on 1)

A dispersion of monodispersed particles produced according to the method of claim 1.

### Claim 15 (depends on 4)

A dispersion of monodispersed particles produced according to the method of claim 4.

### Claim 16 (depends on 8)

An ordered periodic array of particles produced according to the method of claim 8.

### Claim 17 (depends on 9)

An ordered periodic array of particles produced according to the method of claim 9.

### Claim 18 (depends on 13)

An ordered periodic array of particles produced according to the method of claim 13.

### Claim 19

A dispersion of monodispersed polymeric particles having an ionic monomer bound thereto, said ionic monomer comprising sodium styrene sulfonate.

### Claim 20 (depends on 19)

An ordered periodic array of particles, the particles being produced from the dispersion of claim 19.