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SELF ASSEMBLED HYDROCARBON PROTECTIVE LAYERS FOR AEROSILS

IP.com Disclosure Number: IPCOM000027266D
Original Publication Date: 1995-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 1 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

Fumed silicas (such as AEROSILS@) are commonly used as flow aids in toners. An approach to enhancing flow while controlling the charging characteristics of fine toner is to use an Aerosil that is surface modified by a charge control agent (CCA). The most notable shortfall of using commercially available Aerosils in toner is the drastic decrease in triboelectrification values at high humidity levels. A systematic investigation of a series of Aerosils indicated that: 1) Aerosils are negative CCAs in toners even in unsaturated polyester toner resins such as SPAR@ from Goodyear; 2) hydrophobic Aerosils are more negatively going or biased and more resistant to relative humidity changes than their hydrophilic analogs; and 3) the relative humidity dependence on tribo for CCA treated Aerosils is dominated by the Aerosil base itself. The results suggest that if one can render the surface of Aerosil particles perfectly dry or hydrophobic, such as surrounded by a layer of hydrocarbon, it is possible to provide an Aerosil that will exhibit both high tribo as well as low relative humidity dependence at the same time. Thus, a fumed hydrophilic silica is reacted with a mixture of trichloropropyl and trichlorooctadecyl silanes to render silica particles completely hydrophobic.

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XEROX DISCLOSURE JOURNAL

SELF ASSEMBLED Proposed Classification HYDROCARBON PROTECTIVE U.S. C1.430/110 LAYERS FOR AEROSILS
Kock-Yee Law
Ihor W. Tarnawskyj

Int. C1. G03g 09/08

Fumed silicas (such as AEROSILS@) are commonly used as flow aids in toners. An approach to enhancing flow while controlling the charging characteristics of fine toner is to use an Aerosil that is surface modified by a charge control agent (CCA). The most notable shortfall of using commercially available Aerosils in toner is the drastic decrease in triboelectrification values at high humidity levels. A systematic investigation of a series of Aerosils indicated that: 1) Aerosils are negative CCAs in toners even in unsaturated polyester toner resins such as SPAR@ from Goodyear; 2) hydrophobic Aerosils are more negatively going or biased and more resistant to relative humidity changes than their hydrophilic analogs; and 3) the relative humidity dependence on tribo for CCA treated Aerosils is dominated by the Aerosil base itself. The results suggest that if one can render the surface of Aerosil particles perfectly dry or hydrophobic, such as surrounded by a layer of hydrocarbon, it is possible to provide an Aerosil that will exhibit both high tribo as well as low relative humidity dependence at the same time. Thus, a fumed hydrophilic silica is reacted with a mixture of trichloropropyl and trichlorooctadecyl silanes to render silica particles completely hydrophobic.

REFERENCES

U.S. Patent No. 5,3...