Electrostatographic encapsulated toner material improved in powder characteristics

Claim 1

An electrostatographic toner material comprising encapsulated toner particles having an average particle size in the range from about 0.5 to about 1,000 microns, in which the toner particle comprises a pressure fixable adhesive core material containing a colorant and a pressure rupturable shell enclosing the core material, the outer surface of the shell being provided with an organofluoro compound having the formula (I) (Cf)-(Y).sub.n (I) in which (Cf) is a group of n valency, containing both of at least 3 fluorine atoms and at least 3 carbon atoms, n is 1 or 2, and (Y) is ##STR7## in which M is a hydrogen atom, a cation such as an alkali metal an alkaline earth metal or a quaternary ammonium group, or a hydrocarbon residue containing 1-18 carbon atoms; --AO-- is a poly(alkylene oxide) selected from the group consisting of polyoxyethylene, polyoxypropylene, and a block copolymer of ethylene oxide and propylene oxide, in which the polymerization degree ranges from 2 to 100; R is an alkyl group having 1-18 carbon atoms or an aryl group having 6-18 carbon atoms; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are the same or different and each represents an alkyl or hydroxyalkyl group having 1-4 carbon atoms; X is a halogen atom or R-O-SO 2 -O - group in which R has the same meaning as defined above; Z is a group of atoms for constituting a 5- or 6-membered ring in cooperation with the N atom; and D is an alkylene group having 1-5 carbon atoms.