Toner image pressure transfer method and toner useful therefor

Claim 1

A toner for electrophotographic copying comprising particles whose average diameters are in the range of about 2 to about 20 microns, said particles each having a core and a highly uniform enclosing shell; said core comprising a mixture of about 0 to about 20 weight percent of colorant, about 0.05 to about 5 weight percent of charge control agent, and about 80 to about 99.95 weight percent of thermoplastic polymer having a melting temperature in the range of about 40° to about 150° C., and a degree of crystallization in the range of about 5 to about 80%, and said shell comprising colloidal sized particles of a copolymer comprising about 25 to 80 weight percent of addition polymerizable nonionic oleophilic monomer; about 5 to about 45 weight percent of addition polymerizable nonionic hydrophilic monomer; about 1 to about 50 weight percent of addition polymerizable ionic monomer; and about 8 to about 20 weight percent of a crosslinking monomer having at least two addition polymerizable groups.