Surface-modified silica powder and method for producing the same, as well as toner composition for electrophotography

摘要

Provided by the present invention is a surface-modified silica powder, characterized in that the said powder is obtained by surface treatment of a silica powder with one or two or more of a compound (A) and with an aminosilane (B), wherein the fixing rate of the compound (A) and the aminosilane (B) is a total of 50% or more, the hydrophobic rate is 80% or more, and the triboelectrostatic charge amount is 200 μC/g or less in its absolute value. The surface-modified silica powder of the present invention can stabilize many properties including fluidity and electrostatic properties while can significantly reduce problems such as fogging and decrease in image quality without significantly deteriorating characteristics of a developing agent and so forth when this is used as an external additive.

主权项

1. A surface-modified silica powder, characterized in that the surface of the silica powder is treated by using:
one or two or more of a compound (A) shown by any one of the following general formulae (1) to (4) as a first treating agent, and an aminosilane (B) as a second treating agent, respectively, wherein a fixing rate of the compound (A) and the aminosilane (B) is a total of 50% or more, a hydrophobic rate is 80% or more, and a triboelectrostatic charge amount is 200 μC/g or less in its absolute value, wherein R′ to R4 may be the same or different with each other while representing a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a hydroxyl group, a cyano group, a nitro group, a carboxyl group, an optionally substituted liner or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, an optionally substituted linear or branched alkenyl group having 2 to 6 carbon atoms, an optionally substituted linear or branched alkyloxy group having 1 to 6 carbon atoms, an optionally substituted cycloalkyloxy group having 5 to 10 carbon atoms, an optionally substituted aromatic hydrocarbon group, an optionally substituted heterocyclic group, an optionally substituted condensed polycyclic aromatic group, an optionally substituted aryloxy group, an optionally substituted liner or branched alkyl oxycarbonyl group having 1 to 6 carbon atoms, an optionally substituted aryl oxycarbonyl group, an optionally substituted liner or branched aliphatic acyl group having 1 to 8 carbon atoms, or an optionally substituted aromatic acyl group. R1 and R2, R2 and R3, and R3 and R4 may be bonded with each other to form a ring by a single bond or via an optionally substituted methylene group, an oxygen atom, or a sulfur atom, wherein R5 to R8 may be the same or different with each other while representing a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a hydroxyl group, a cyano group, a nitro group, a carboxyl group, an optionally substituted liner or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, an optionally substituted linear or branched alkenyl group having 2 to 6 carbon atoms, an optionally substituted linear or branched alkyloxy group having 1 to 6 carbon atoms, an optionally substituted cycloalkyloxy group having 5 to 10 carbon atoms, an optionally substituted aromatic hydrocarbon group, an optionally substituted heterocyclic group, an optionally substituted condensed polycyclic aromatic group, an optionally substituted aryloxy group, an optionally substituted liner or branched alkyl oxycarbonyl group having 1 to 6 carbon atoms, an optionally substituted aryl oxycarbonyl group, an optionally substituted liner or branched aliphatic acyl group having 1 to 8 carbon atoms, or an optionally substituted aromatic acyl group. R5 and R6, R6 and R7, and R7 and R8 may be bonded with each other to form a ring by a single bond or via an optionally substituted methylene group, an oxygen atom, or a sulfur atom, wherein R9 to R12 may be the same or different with each other while representing a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a hydroxyl group, a cyano group, a nitro group, a carboxyl group, an optionally substituted liner or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, an optionally substituted linear or branched alkenyl group having 2 to 6 carbon atoms, an optionally substituted linear or branched alkyloxy group having 1 to 6 carbon atoms, an optionally substituted cycloalkyloxy group having 5 to 10 carbon atoms, an optionally substituted aromatic hydrocarbon group, an optionally substituted heterocyclic group, an optionally substituted condensed polycyclic aromatic group, an optionally substituted aryloxy group, an optionally substituted liner or branched alkyl oxycarbonyl group having 1 to 6 carbon atoms, an optionally substituted aryl oxycarbonyl group, an optionally substituted liner or branched aliphatic acyl group having 1 to 8 carbon atoms, or an optionally substituted aromatic acyl group. R9 and R10, R10 and R11, and R11 and R12 may be bonded with each other to form a ring by a single bond or via an optionally substituted methylene group, an oxygen atom, or a sulfur atom. R13 represents a hydrogen atom, a deuterium atom, an optionally substituted liner or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, an optionally substituted linear or branched alkenyl group having 2 to 6 carbon atoms, an optionally substituted aromatic hydrocarbon group, an optionally substituted heterocyclic group, an optionally substituted condensed polycyclic aromatic group, an optionally substituted liner or branched alkyl oxycarbonyl group having 1 to 6 carbon atoms, an optionally substituted aryl oxycarbonyl group, an optionally substituted liner or branched aliphatic acyl group having 1 to 8 carbon atoms, or an optionally substituted aromatic acyl group, wherein R14 and R15 may be the same or different with each other while representing a deuterium atom, a fluorine atom, a chlorine atom, a hydroxyl group, a cyano group, a nitro group, a carboxyl group, an optionally substituted liner or branched alkyl group having 1 to 6 carbon atoms, an optionally substituted cycloalkyl group having 5 to 10 carbon atoms, an optionally substituted linear or branched alkenyl group having 2 to 6 carbon atoms, an optionally substituted linear or branched alkyloxy group having 1 to 6 carbon atoms, an optionally substituted cycloalkyloxy group having 5 to 10 carbon atoms, an optionally substituted aromatic hydrocarbon group, an optionally substituted heterocyclic group, an optionally substituted condensed polycyclic aromatic group, an optionally substituted aryloxy group, an optionally substituted liner or branched alkyl oxycarbonyl group having 1 to 6 carbon atoms, an optionally substituted aryl oxycarbonyl group, an optionally substituted liner or branched aliphatic acyl group having 1 to 8 carbon atoms, or an optionally substituted aromatic acyl group, wherein these groups may be bonded with each other to form a ring. Reference characters “m” and “n” may be the same or different with each other while representing zero or an integer of 1 to 4.