DISPERSIONS OF ENCAPSULATED PARTICLES AND METHODS FOR THEIR PRODUCTION AND USE

• US 20110223220A1
• Filed: 03/15/2010
• Published: 09/15/2011
• Est. Priority Date: 03/15/2010
• Status: Abandoned Application

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Hung, Cheng-Hung, Vanier, Noel R.
• Application Number:
  US12/723,829
• Publication Number:
  US 20110223220A1
• Time in Patent Office: Days
• US Class Current: 424/401
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 32/90 Carbides
• CPC Class Codes: C01B 32/991 Boron carbide
• CPC Class Codes: C01B 33/14 Colloidal silica, e.g. dispersions, gels, sols
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C04B 2235/3418 Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint glass constituents C04B2235/36
• CPC Class Codes: C04B 2235/3821 Boron carbides
• CPC Class Codes: C04B 2235/5409 expressed by specific surface values
• CPC Class Codes: C04B 2235/5445 submicron sized, i.e. from 0,1 to 1 micron
• CPC Class Codes: C04B 2235/5454 nanometer sized, i.e. below 100 nm
• CPC Class Codes: C04B 35/6264 Mixing media, e.g. organic solvents
• CPC Class Codes: C04B 35/62665 Flame, plasma or melting treatment
• CPC Class Codes: C04B 35/62805 Oxide ceramics
• CPC Class Codes: C04B 35/62897 Coatings characterised by their thickness
• CPC Class Codes: C09C 1/3054 Coating
• CPC Class Codes: C09C 3/063 Coating

Abstract

Disclosed are dispersions of encapsulated particles and methods for their production and use. These dispersions include encapsulated particles and a liquid medium in which the encapsulated particles are dispersed. The encapsulated particles include a carrier particle and an encapsulant deposited on the carrier particle. The liquid medium and the encapsulant are selected so as to be capable of reacting with each other to form a reaction product having a boiling point of no more than 300° C. at atmospheric pressure.

Claims

1. A dispersion comprising:

(a) encapsulated particles comprising;

(i) a carrier particle comprising a surface; and

(ii) an encapsulant deposited on the surface of the carrier particle; and

(b) a liquid medium in which the encapsulated particles are dispersed,

wherein the liquid medium and the encapsulant are selected so as to be capable of reacting with each other to form a reaction product having a boiling point of no more than 300°

C. at atmospheric pressure.

2. The dispersion of claim 1, wherein the encapsulant comprises ultrafine particles.

3. The dispersion of claim 1, wherein the encapsulant forms a continuous layer on the carrier particle.

4. The dispersion of claim 1, wherein the carrier particle has a particle size of no more than 400 nanometers.

5. The dispersion of claim 1, wherein the carrier particle comprises an oxide.

6. The dispersion of claim 5, wherein the oxide comprises SiO₂.

7. The dispersion of claim 1, wherein the carrier particle comprises a carbide.

8. The dispersion of claim 7, wherein the carbide comprises B₄C.

9. The dispersion of claim 1, wherein the reaction product has a boiling point of no more than 200°

C. at atmospheric pressure.

10. The dispersion of claim 9, wherein the reaction product has a boiling point of no more than 70°

C. at atmospheric pressure.

11. The dispersion of claim 1, wherein the encapsulant comprises an oxoacid.

12. The dispersion of claim 11, wherein the encapsulant comprises B₂O₃ and/or P₂O₅.

13. The dispersion of claim 11, wherein the liquid medium comprises a hydroxyl containing compound.

14. The dispersion of claim 13, wherein the hydroxyl containing compound comprises a C₁-C₄ monoalcohol.

15. The dispersion of claim 1, further comprising a stabilizing agent.

16. A dispersion comprising:

(a) encapsulated ultrafine particles comprising;

(i) a carrier particle comprising a surface; and

(ii) an encapsulant comprising B₂O₃ and/or P₂O₅ deposited on the surface of the carrier particle; and

(b) a liquid medium in which the encapsulated particles are dispersed and comprising a C₁-C₄ monoalcohol.

17. A method for making a dispersion of ultrafine particles in a liquid medium, the method comprising reacting a liquid medium with encapsulated ultrafine particles to form a reaction product that has a boiling point of no more than 300°

C. at atmospheric pressure.

18. The method of claim 17, wherein the reaction takes place in the presence of a stabilizing agent.

19. The method of claim 17, further comprising removing the reaction product from the dispersion.

20. The method of claim 17, wherein the encapsulated ultrafine particles comprise an encapsulant comprising B₂O₃ and/or P₂O₅ and the liquid medium comprises a C₁-C₄ monoalcohol.