Patent ID: 6040101
Filing Date: 2000-03-21
Classification: G03G

Abstract:
A carrier particle for use in electrostatic image development including a core and a coating layer formed on the surface of the core, wherein the coating layer is made of a coating material comprising:(A) an polyethyleneimine having two or more functional amino groups, with the proviso that the polyethyleneimine does not contain an Si(OR.sup.1) group, where R.sup.1 is a hydrogen atom, a lower alkyl group containing 1 to 4 carbon atoms or an acyl group;(B) a silane compound and/or a hydrolytic condensation product thereof, having a functional group selected from the group consisting of an epoxy group and a mercapto group, wherein said functional group is reactive with the functional amino groups of the polyethyleneimine (A), and an Si(OR.sup.1) group, where R.sup.1 is a hydrogen atom, a lower alkyl group containing 1 to 4 carbon atoms or an acyl group;(C) an organometallic compound of the formula (C) and/or a hydrolytic condensation product thereof:R.sup.2.sub.m M(OR.sup.3).sub.n (C)wherein M is Si or a metal element; R.sup.2 is the same or different hydrogen atom, a lower alkyl group containing 1 to 4 carbon atoms or an allyl group; R.sup.3 is the same or different hydrogen atom, a lower allyl group containing 1 to 4 carbon atoms or an acyl group; m is 0 or a positive integer; n is an integer of 1 or more; and (m+n) is equal to the valency of element M; and(D) a solvent.