Toner image pressure transfer method and toner useful therefor
First Claim
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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.
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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 processe for transferring a toned image comprised of such particles from a photoconductor to a receiver.
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Citations
7 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 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°
Specification
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Current AssigneeEastman Kodak Company
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Original AssigneeEastman Kodak Company
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InventorsTyagi, Dinesh, Sorriero, Louis J., Pierce, Zona R.
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Primary Examiner(s)McCamish, Marion E.
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Assistant Examiner(s)RoDee, Christopher D.
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Application NumberUS07/457,674Time in Patent Office629 DaysField of Search430/111, 430/107, 430/138, 430/109US Class Current430/110.2CPC Class CodesB01J 13/06 by phase separationG03G 9/08728 Polymers of estersG03G 9/09321 obtained by reactions only ...G03G 9/09357 Macromolecular compoundsG03G 9/09371 obtained otherwise than by ...
