Charge director for liquid toner

摘要

A charge director material for charging a liquid toner, the charge director material comprising (a) nanoparticles of a simple salt and (b) a sulfosuccinate salt of the general formula MAn, wherein M is a metal, n is the valence of M, and A is an ion of the general formula (I)
[R1—O—C(O)CH2CH(SO3−)C(O)—O—R2],  (I)
wherein each of R1 and R2 is an alkyl group; said charge director material being substantially free of acids of the general formula (I), wherein one or both of R1 and R2 is hydrogen, and if only one of them is hydrogen, the other is an alkyl group.

主权项

1. A method for obtaining a chemical material of the general formula MpXq.MAn in a reaction mixture, wherein M is a metal, X is an anion, n is the valence of M, and p and q are coefficients that ensures that MpXq is electrically balanced, and A is a compound of the general formula (I)
[R1—O—C(O)CH2CH(SO3−)C(O)—O—R2],   (I) wherein R1 and R2 are alkyl groups and wherein at least one of R1 and R2 is C13H27, the method comprising: (a) providing a sulfosuccinate salt of the general formula M′An′, wherein M′ is a metal other than M and n′ the valence of M′; (b) adding a strong acid, having at least one pKa smaller than 1, to obtain a first reaction mixture containing a sulfonic acid of the general formula HA; (c) working up the obtained reaction mixture to obtain substantially pure HA; and (d) adding a predetermined amount of base M(OH)n, in the presence of an ionic substance, as to obtain a second reaction mixture containing a chemical material of the general formula MpXq.MAn.