This invention provides metal oxide particles surface-treated with a hydrophobicity-imparting agent, methods of making such, and toner compositions comprising the same.

Claims

51 · 3 independent · depth 4

51 granted claims

›1.independentA particle composition comprising metal oxide particles surface-treated in a basic aqueous dispersion with a first hydrophobicity-imparting agent, whi…+16

›2.↳ 1The composition of claim 1, wherein the first hydrophobicity-imparting agent is a trialkoxysilane compound.d2+1

›4.↳ 1The composition of claim 1, wherein the metal oxide particles are surface-treated with a second hydrophobicity-imparting agent.d2+3

›8.↳ 1The composition of claim 1, wherein the surface-treated metal oxide particles have an average particle size of about 300 nm or less.d2

›9.↳ 1The composition of claim 1, wherein the surface-treated metal oxide particles have a BET surface area of about 80 m2/g or less.d2

›10.↳ 1The composition of claim 1, wherein the surface-treated metal oxide particles have a tap density of about 290 g/L to about 650 g/L.d2

›11.↳ 1The composition of claim 1, wherein the metal oxide particles have a true density of about 1.7 g/cm3 to about 2.0 g/cm3.d2

›12.↳ 1The composition of claim 1, wherein the metal oxide particles have a true density of about 2.0 g/cm3 to about 2.3 g/cm3.d2

›13.↳ 1The composition of claim 1, wherein a solid-state Si nuclear magnetic resonance spectrum of the surface-treated metal oxide particles exhibits a ratio…d2

›14.↳ 1The composition of claim 1, wherein the metal oxide particles are colloidal silica particles.d2+1

›16.↳ 1The composition of claim 1, wherein the basic aqueous dispersion has a pH of about 8 to about 11.d2

›17.↳ 1The composition of claim 1, wherein the surface-treated metal oxide particles have an average particle size of about 20 nm to about 300 nm, and wherei…d2

›18.independentA toner composition comprising toner particles and metal oxide particles surface-treated in a basic aqueous dispersion with a first hydrophobicity-imp…+16

›19.↳ 18The toner composition of claim 18, wherein the first hydrophobicity-imparting agent is a trialkoxysilane compound.d2+1

›21.↳ 18The toner composition of claim 18, wherein the metal oxide particles are surface-treated with a second hydrophobicity-imparting agent.d2+3

›25.↳ 18The toner composition of claim 18, wherein the surface-treated metal oxide particles have an average particle size of about 300 nm or less.d2

›26.↳ 18The toner composition of claim 18, wherein the surface-treated metal oxide particles have a BET surface area of about 80 m2/g or less.d2

›27.↳ 18The toner composition of claim 18, wherein the surface-treated metal oxide particles have a tap density of about 290 g/L to about 650 g/L.d2

›28.↳ 18The toner composition of claim 18, wherein the metal oxide particles have a true density of about 1.7 g/cm3 to about 2.0 g/cm3.d2

›29.↳ 18The toner composition of claim 18, wherein the metal oxide particles have a true density of about 2.0 g/cm3 to about 2.3 g/cm3.d2

›30.↳ 18The toner composition of claim 18, wherein the metal oxide particles are colloidal silica particles.d2+1

›32.↳ 18The toner composition of claim 18, wherein a solid-state Si nuclear magnetic resonance spectrum of the surface-treated metal oxide particles exhibits …d2

›33.↳ 18The toner composition of claim 18, wherein the basic aqueous dispersion has a pH of about 8 to about 11.d2

›34.↳ 18The toner composition of claim 18, wherein the surface-treated metal oxide particles have an average particle size of about 20 nm to about 300 nm, and…d2

›35.independentA method of preparing hydrophobic surface-treated metal oxide particles comprisingn(a) providing an aqueous dispersion of non-aggregated metal oxide p…+16

›36.↳ 35The method of claim 35, wherein the first hydrophobicity-imparting agent is a trialkoxysilane compound.d2+1

›38.↳ 35The method of claim 35, wherein part (b) further comprises combining the dispersion with a second hydrophobicity-imparting agent.d2+5

›42.↳ 35The method of claim 35, wherein the agglomerate particle size of the hydrophobic surface-treated metal oxide particles is reduced after the dispersion…d2

›43.↳ 35The method of claim 35, wherein the dispersion is prepared by mixing an aqueous metal oxide dispersion with a water-miscible organic solvent, before c…d2

›46.↳ 35The method of claim 35, wherein the reaction mixture is maintained at a temperature between about 40° C. and about 80° C. for about 1 hour or longer.d2

›47.↳ 35The method of claim 35, wherein the dispersion comprises between about 10 wt. % and about 45 wt. % metal oxide particles.d2

›48.↳ 35The method of claim 35, wherein the metal oxide particles are colloidal silica particles.d2+1

›50.↳ 35The method of claim 35, wherein the aqueous dispersion has a pH of about 8 to about 11.d2

›51.↳ 35The method of claim 35, wherein the hydrophobic surface-treated metal oxide particles have an average particle size of about 20 nm to about 300 nm, an…d2

Classifications

6 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B82Y30/00

Section C — Chemistry; metallurgy

C09C3/12
C01B33/14
C09C1/30

Section G — Physics

G03G9/097
G03G9/113

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8.3 y

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Examiner

Ronak Patel

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Priority chain

2 priority documents

Priority

15 Sep 2006

earliest claimed

›Priority documents — 2

Type	Document	Date
provisional	US 60844828	15 Sep 2006
related publication	US 20080070146 A1	20 Mar 2008

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