Hydrophobic-treated metal oxide
a metal oxide and hydrophobic technology, applied in the field of hydrophobic treatment of metal oxide, can solve the problems of inefficiency or difficulty in direct treatment of metal oxide particles in aqueous dispersion or other problems
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example 1
[0069]This example demonstrates the effect of the free alkali metal cation content of the treated metal oxide particles on the tribocharge of toner compositions comprising the treated metal oxide particles.
[0070]Two treated silica compositions (Compositions 1A and 1B) were prepared as follows: 100 g of the silica dispersion indicated in Table 2 was added to the reaction vessel. HMDZ was added to the dispersion in the amount indicated in Table 2, and the mixture was stirred rapidly at 50-55° C. at a rate such that the vortex of the dispersion extended at least to the top of the agitator blade. The mixture was allowed to react for 8 hours. The mixture was then poured into a glass dish and dried in a forced-air oven at 120-130° C.
[0071]The carbon content of the dried particles before and after extraction with toluene is presented in Table 2. Extraction was a Soxhlet extraction using 0.5-2 g of silica and approximately 100 ml toluene.
[0072]Toner compositions were prepared using the trea...
example 2
[0074]This example demonstrates the effect of the free alkali metal cation content of the treated metal oxide particles on the tribocharge of toner compositions comprising the treated metal oxide particles.
[0075]Three treated silica particle compositions (Compositions 2A-2C) were prepared as follows: 100 g of deionized water was added to 100 g of the silica dispersion indicated in Table 3 to reduce the concentration of silica to about 20 wt. %. In a separate beaker, 3.6 g OTES was dissolved in 90 mL of isopropyl alcohol (IPA) and then added to the silica dispersion with continuous agitation. The reaction mixture was continuously stirred and heated to 70-75° C. for 8 hours.
[0076]Compositions 2A and 2B were then cooled to room temperature, poured into a glass dish, and dried in a forced-air oven at 120-130° C. Composition 2C was cooled to room temperature, and 10% acetic acid was then added to the reaction mixture to reduce the pH to about 6. The treated silica of Composition 2C was t...
example 3
[0081]This example demonstrates the treatment of metal oxide particles with a first hydrophobicity-imparting agent and a second hydrophobicity-imparting agent.
[0082]Three treated silica compositions (Compositions 3A-3C) were prepared as follows: 100 g of deionzed water was added to 100 g of the silica dispersion indicated in Table 5 to reduce the concentration of silica to about 20 wt. %.
[0083]Compositions 3A and 3B were treated as follows: 3.2 g HMDZ was added to the dispersion, and the reaction mixture was stirred rapidly at 50-55° C. at a rate such that the vortex of the dispersion extended at least to the top of the agitator blade. The mixture was allowed to react for 5 hours. In a separate beaker, 2.2 g OTES was dissolved in 90 mL of isopropyl alcohol (IPA) and then added to the reaction mixture with continuous agitation. The temperature of the reaction mixture was raised to 70-75° C. and the mixture was allowed to react for 5 hours. The reaction mixture was cooled to room temp...
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Abstract
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