Making Method For Titania Nanoparticle

Abstract

The present invention relates to a method of manufacturing titania nanoparticles, and specifically to a method of manufacturing titania nanoparticles wherein the particle size is uniform, it is possible to manufacture monodisperse particles without aggregation among particles, a uniform coating can be applied, that is suitable to large-scale production, and that can obtain high-resolution images by maintaining the toner electric charge and electric charge distribution; and the developer included in said titania nanoparticles.

1 . A composition comprising:
 hydrophobized titania nanoparticles produced from dried and sintered titanium hydroxide, the titanium hydroxide being produced by mixing a salt or alkoxide of titania with a solvent and scanning with microwaves to synthesize a titania precursor, then adding an alkaline catalyst to the solvent so as to produce spherical nanoparticles of titanium hydroxide.   
     
     
         2 . The composition of  claim 1 , wherein the titania salt or titania alkoxide comprises one or more compounds selected from the group consisting of titanium oxychloride, titanium chloride, titanium nitrate, titanium sulfate, and C1-C12 titanium alkoxides. 
     
     
         3 . The composition of  claim 1 , wherein the alkaline catalyst comprises at least one of an amine, a hydroxy group, or an aqueous solution of same. 
     
     
         4 . The composition of  claim 1 , wherein the pH of the mixture is maintained between 5 and 10 after the addition of the alkaline catalyst. 
     
     
         5 . The composition of  claim 1 , wherein the spherical nanoparticles are dried over a period of about 4 to about 12 hours at a temperature in the range of from about 100 to about 130° C. after preparatory drying at a temperature in the range of from about 50 to about 70° C. for a period in the range of from about 1 to about 3 hours. 
     
     
         6 . The composition of  claim 1 , wherein the spherical nanoparticles are sintered for a period of from about 1 to about 4 hours at a temperature in the range of from about 600 to about 800° C. 
     
     
         7 . The composition of  claim 1 , further comprising one or more hydrophobization agents chosen from among the group comprising hexamethyldisilazane (HMDS), methyltrimethoxysilane (MTMS), dimethyldiethoxysilane (DMDES), and trimethylethoxysilane (TMES), isopropyl triisostearoyl titanate (KR-TTS), isopropyl dimethaacryl isostearoyl titanate (KR-7), isopropyl tri(dodecyl)benzenesulfonyl titanate(KR-9S), isopropyl tri(dioctyl)pyrophosphato titanate (KR-38S), di(cumyl)phenyl oxoethylene titanate (KR-134S), di(dioctyl)pyrophosphate oxoethylene titanate (KR-138S), neopentyl(diallyl)oxy, and tri(dioctyl)pyro-phosphato titanate (LICA-38). 
     
     
         8 . The composition of  claim 7 , wherein the hydrophobization agent is used in a range of from about 1 to about 20 weight parts with respect to 100 weight parts of solid crystalline titania nanoparticles. 
     
     
         9 . The composition of  claim 1 , wherein the average diameter of said titania nanoparticles is in a range of from about 30 to about 200 nm, and the specific surface area is in a range of from about 20 to about 100 m 2 /g. 
     
     
         11 . The composition of  claim 9 , wherein the titania nanoparticles have a contact angle with respect to water in a range of from about 100 to about 170 ° C. 
     
     
         12 . The composition of  claim 1 , further comprising a carrier.