AEROSIL® Fumed Silica for Toners
AEROSIL® fumed silica is typically applied to improve flow and charge stability of toners. Performance enhancements such as improved resolution and print clarity of dry milled and chemically produced toner for laser printers or plain paper copiers have driven an increased usage.
Driving the technological advancement is a trend toward producing smaller particle sized toner. Due to the greater difficulties in maintaining good flow and controlling charge, larger particle sized AEROSIL® fumed silica grades such as RY50, RX50, NY50 or NAX50 are used in combination with smaller size AEROSIL® grades such as R972, R812, R805, RY200, RY200S, R202, RX200, RY300 for negative-charged toners (particle size : 6~8 µm on average).
The two major benefits of using AEROSIL® fumed silica in this application are:
(1) Improvement of dry toner's flowability. Typical addition rates vary from 0.5 -1.5 % based on toner wt %.
(2) Minimization of electrostatic charge variation at extreme conditions. The electrostatic charge of dry toner is stabilized at different ambient conditions such as 85 % relative humidity, 40°C (Summer) and 20 % relative humidity, 10°C (Winter). The typical addition rate for AEROSIL® is 0.5~1 wt%
Following these two guidelines, developing toners for clear and high-resolution copies is made easier in any environment using even the smallest particle size toners.
For positive charged toners, positive-charged AEROSIL® fumed silica is used for free flow improvement and electrostatic charge stability in a variety of environments. AEROSIL® fumed silica grades such as R504, RA200HS and NA50H are widely used in positive charged toner formulations.
For full color toner, the combined use of hydrophobic AEROSIL® fumed silicas such as NAX50, R972 or RX50 and hydrophobic fumed Titanium oxides such as AEROXIDE® TiO2 NKT90 or AEROXIDE® TiO2 T805 or the combined use of hydrophobic AEROSIL® fumed silicas such as RX50, RY50 and R972 is recommended to stabilize the electrostatic charge of 4 color toners (black, cyan, yellow, magenta).
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Negative-toner (black) |
Positive-toner (black) |
Color-toner (negative) |
| Free-flow and stabilization of electrostatic charge |
AEROSIL® R972
AEROSIL® R974
AEROSIL® RX200
AEROSIL® RX300
AEROSIL® R812
AEROSIL® R812S
AEROSIL® R104
AEROSIL® R106
AEROSIL® R805 |
AEROSIL® R504
AEROSIL® RA200HS
AEROSIL® NA50H
AEROSIL® R972 |
AEROXIDE® TiO2 NKT90
AEROXIDE® TiO2 T805
in combination with silica |
| Prevention of embedding of AEROSIL® into toner |
Combination of AEROSIL® RX50, AEROSIL® RY50, AEROSIL® NAX50, AEROSIL® NY50 with AEROSIL® R972, AEROSIL® R812, AEROSIL® R812S, AEROSIL® RX200, AEROSIL® RX300, AEROSIL® R805, AEROSIL® RY200S, AEROSIL® RY200, AEROSIL® R202, AEROSIL® RY300 |
| Prevention of void in printed image |
AEROSIL® RY200S
AEROSIL® RY200
AEROSIL® R202
AEROSIL® RY300 |
|
|
| Prevention of filming on OPC drum |
AEROSIL® RY200S
AEROSIL® RY200
AEROSIL® R202
AEROSIL® RY300
AEROXIDE® Alu C |
AEROXIDE® Alu C |
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A selection of Technical Bulletins, Technical Information, Industry Information and General Brochures containing comprehensive information on our products and their applications are available for download, resp. ordering at our Literature Page.
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