Toner image pressure transfer method and toner useful therefor
First Claim
Patent Images
1. A method for producing a toned image upon a receiver comprising the steps of:
- (a) applying a thin coating of a fatty acid metal salt wherein said metal is selected from the group consisting of zinc and cadmium upon the imagable surface of a photoconductor element;
(b) forming a transferable toner powder image upon said coating by electrostatically charging said surface, exposing the charged surface to a light image of a graphic original to produce a latent image of such original, and applying toner powder to the imaged surface to produce a developed image;
(c) rolling a pressure roller over said toner powder image with said receiver positioned between said roller and said toner powder image while maintaining a pressure between said surface and the nip region of said roller in the range of about 5 to about 30 pounds per lineal inch; and
(d) separating said receiver from said surface with said toner powder image adhered thereto;
wherein said toner powder comprises particles having average particle diameters in the range of about 1 to about 20 microns, said particles each having a core and a highly uniform enclosing shell, said core comprising on a total core composition basis an admixture 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., a degree of crystallization in the range of about 5 to about 80 percent; and
said shell comprises colloidal sized particles of a copolymer comprising about 25 to about 80 weight percent of an addition polymerizable nonionic oleophilic monomer;
about 5 to about 45 weight percent of an addition polymerizable nonionic hydrophilic monomer;
about 1 to about 50 weight percent of an addition polymerizable ionic monomer; and
abut 8 to about 20 weight percent of a crosslinking monomer having at least two addition polymerizable groups.
2 Assignments
0 Petitions
Accused Products
Abstract
Pressure-sensitive, heat-fusible, encapsulated toner particles are provided which have very uniform size and physical characteristics. A method for making the particles is provided wherein a latex copolymer functions as a stabilizer controlling particle size of the core composition of the toner particles. The latex copolymer becomes the shell composition thereof. The particles are particularly useful in a process for transferring a toned image comprised of such particles from a photoconductor to a receiver.
15 Citations
6 Claims
-
1. A method for producing a toned image upon a receiver comprising the steps of:
-
(a) applying a thin coating of a fatty acid metal salt wherein said metal is selected from the group consisting of zinc and cadmium upon the imagable surface of a photoconductor element; (b) forming a transferable toner powder image upon said coating by electrostatically charging said surface, exposing the charged surface to a light image of a graphic original to produce a latent image of such original, and applying toner powder to the imaged surface to produce a developed image; (c) rolling a pressure roller over said toner powder image with said receiver positioned between said roller and said toner powder image while maintaining a pressure between said surface and the nip region of said roller in the range of about 5 to about 30 pounds per lineal inch; and (d) separating said receiver from said surface with said toner powder image adhered thereto;
wherein said toner powder comprises particles having average particle diameters in the range of about 1 to about 20 microns, said particles each having a core and a highly uniform enclosing shell, said core comprising on a total core composition basis an admixture 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., a degree of crystallization in the range of about 5 to about 80 percent; and
said shell comprises colloidal sized particles of a copolymer comprising about 25 to about 80 weight percent of an addition polymerizable nonionic oleophilic monomer;
about 5 to about 45 weight percent of an addition polymerizable nonionic hydrophilic monomer;
about 1 to about 50 weight percent of an addition polymerizable ionic monomer; and
abut 8 to about 20 weight percent of a crosslinking monomer having at least two addition polymerizable groups. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification